new icons and settings.

Use transparent status bar color

Closes #2203

See merge request fdroid/fdroidclient!1029

.gitattributes

@@ -0,0 +1 @@
+*.gpg           binary

.gitignore

@@ -16,7 +16,6 @@ build.xml
 # Gradle files
 .gradle/
 build/
-gradle.properties
 
 # Local configuration file (sdk path, etc)
 local.properties
@@ -47,4 +46,4 @@ junit-report.xml
 # Screen dumps from Android Studio/DDMS
 captures/
 
-/fdroid/
+/fdroid/

.gitlab-ci.yml

@@ -1,26 +1,36 @@
-image: registry.gitlab.com/fdroid/ci-images-client:latest
-
-cache:
-  paths:
-    - .gradle/wrapper
-    - .gradle/caches
-
 stages:
   - test
   - deploy
 
-before_script:
-  - export GRADLE_USER_HOME=$PWD/.gradle
-  - export ANDROID_COMPILE_SDK=`sed -n 's,.*compileSdkVersion\s*\([0-9][0-9]*\).*,\1,p' app/build.gradle`
-  - alias sdkmanager="sdkmanager --no_https"
-  - echo y | sdkmanager "platforms;android-${ANDROID_COMPILE_SDK}" > /dev/null
+.base:
+  image: registry.gitlab.com/fdroid/ci-images-client:latest
+  before_script:
+    - export GRADLE_USER_HOME=$PWD/.gradle
+    - export ANDROID_COMPILE_SDK=`sed -n 's,.*compileSdkVersion\s*\([0-9][0-9]*\).*,\1,p' app/build.gradle`
+    - alias sdkmanager="sdkmanager --no_https"
+    - echo y | sdkmanager "platforms;android-${ANDROID_COMPILE_SDK}" > /dev/null
+    # limit RAM usage for all gradle runs
+    - export maxmem=$(expr $(sed -n 's,^MemAvailable:[^0-9]*\([0-9][0-9]*\)[^0-9]*$,\1,p' /proc/meminfo) / 1024 / 2 / 1024 \* 1024)
+    - printf "\norg.gradle.jvmargs=-Xmx${maxmem}m -XX:MaxPermSize=${maxmem}m\norg.gradle.daemon=false\norg.gradle.parallel=false\n" >> gradle.properties
+  after_script:
+    # this file changes every time but should not be cached
+    - rm -f $GRADLE_USER_HOME/caches/modules-2/modules-2.lock
+    - rm -fr $GRADLE_USER_HOME/caches/*/plugin-resolution/
+  cache:
+    paths:
+      - .gradle/wrapper
+      - .gradle/caches
 
 .test-template: &test-template
+  extends: .base
   stage: test
   artifacts:
     name: "${CI_PROJECT_PATH}_${CI_JOB_STAGE}_${CI_COMMIT_REF_NAME}_${CI_COMMIT_SHA}"
     paths:
+      - kernel.log
       - logcat.txt
+      - app/core*
+      - app/*.log
       - app/build/reports
       - app/build/outputs/*ml
       - app/build/outputs/apk
@@ -35,29 +45,40 @@ test_lint_pmd_checkstyle:
   <<: *test-template
   script:
     - export EXITVALUE=0
+    - function set_error() { export EXITVALUE=1; printf "\x1b[31mERROR `history|tail -2|head -1|cut -b 6-500`\x1b[0m\n"; }
     - ./gradlew assemble
     # always report on lint errors to the build log
     - sed -i -e 's,textReport .*,textReport true,' app/build.gradle
-    - ./gradlew testFullDebugUnitTest
-    - ./gradlew lint
-    - ./gradlew pmd || export EXITVALUE=1
-    - ./gradlew checkstyle || export EXITVALUE=1
-    - ./tools/check-format-strings.py || export EXITVALUE=1
-    - ./tools/check-fastlane-whitespace.py || export EXITVALUE=1
-    - ./tools/remove-unused-and-blank-translations.py || export EXITVALUE=1
+    - ./gradlew testFullDebugUnitTest || set_error
+    - ./gradlew lint || set_error
+    - ./gradlew pmd || set_error
+    - ./gradlew checkstyle || set_error
+    - ./tools/check-format-strings.py || set_error
+    - ./tools/check-fastlane-whitespace.py || set_error
+    - ./tools/remove-unused-and-blank-translations.py || set_error
     - echo "These are unused or blank translations that should be removed:"
-    - git --no-pager diff --ignore-all-space --name-only --exit-code app/src/*/res/values*/strings.xml || export EXITVALUE=1
+    - git --no-pager diff --ignore-all-space --name-only --exit-code app/src/*/res/values*/strings.xml || set_error
     - exit $EXITVALUE
 
 errorprone:
+  extends: .base
   stage: test
   script:
+    - apt-get update
+    - apt-get install -t stretch-backports openjdk-11-jdk-headless
+    - update-java-alternatives --set java-1.11.0-openjdk-amd64
+    - export JAVA_HOME=/usr/lib/jvm/java-1.11.0-openjdk-amd64
     - cat config/errorprone.gradle >> app/build.gradle
-    - ./gradlew assembleDebug
+    - ./gradlew -Dorg.gradle.dependency.verification=lenient assembleDebug
 
+# Run the tests in the emulator.  Each step is broken out to run on
+# its own since the CI runner can have limited RAM, and the emulator
+# can take a while to start.
+#
 # once these prove stable, the task should be switched to
 # connectedCheck to test all the build flavors
 .connected-template: &connected-template
+  extends: .base
   script:
     - ./gradlew assembleFullDebug
     - export AVD_SDK=`echo $CI_JOB_NAME | awk '{print $2}'`
@@ -65,63 +86,23 @@ errorprone:
     - export AVD_ARCH=`echo $CI_JOB_NAME | awk '{print $4}'`
     - export AVD_PACKAGE="system-images;android-${AVD_SDK};${AVD_TAG};${AVD_ARCH}"
     - echo $AVD_PACKAGE
-    - emulator -accel-check || true
-
-    # Use bleeding edge for Q, or download proven emulator version, based on
-    # https://aur.archlinux.org/android-emulator.git
-    - if [[ "$AVD_SDK" == Q ]]; then
-          set -x; echo y | sdkmanager --channel=3 "emulator" > /dev/null; set +x;
-      else
-          set -x;
-          rm -rf $ANDROID_HOME/emulator;
-          wget -q http://dl.google.com/android/repository/emulator-linux-5264690.zip;
-          echo "48c1cda2bdf3095d9d9d5c010fbfb3d6d673e3ea  emulator-linux-5264690.zip" | sha1sum -c;
-          unzip -qq -d $ANDROID_HOME emulator-linux-5264690.zip;
-          set +x;
-      fi
-    - grep -v '^License' $ANDROID_HOME/tools/source.properties
-                         $ANDROID_HOME/emulator/source.properties
 
     - alias sdkmanager
-    - echo y | sdkmanager "platforms;android-$AVD_SDK" > /dev/null
-    - if ! avdmanager list avd | grep "Name. avd$AVD_SDK$"; then
-          set -x;
-          rm -rf ~/.android/avd  $ANDROID_HOME/system-images;
-          echo y | sdkmanager "$AVD_PACKAGE" > /dev/null;
-          echo no | avdmanager create avd --name avd$AVD_SDK --tag "$AVD_TAG" --package "$AVD_PACKAGE" --sdcard 64M --device "Nexus 5";
-          export RAMSIZE="`sed -n 's,^MemAvailable:[^0-9]*\([0-9][0-9]*\)[^0-9]*$,\1,p' /proc/meminfo`";
-          if [ $RAMSIZE -le 2048 ]; then
-              sed -i '/^hw\.ramSize\s*=.*/d' ~/.android/avd/*.avd/config.ini;
-              echo "hw.ramSize=1024" >> ~/.android/avd/*.avd/config.ini;
-          fi;
-          avdmanager list avd;
-          set +x;
-      fi
-    - grep -v '^License' $ANDROID_HOME/system-images/android-$AVD_SDK/$AVD_TAG/$AVD_ARCH/source.properties
-    - adb start-server
     - ls -l ~/.android
-    - emulator -version
-    - emulator -avd avd$AVD_SDK
-        -no-audio
-        -no-jni
-        -no-snapstorage
-        -no-window
-        -skip-adb-auth
-        -verbose
-        -wipe-data
-        -debug all,-hw_control,-qemud,-sensors,-surface
-        &
+
+    - adb start-server
+    - start-emulator
     - wait-for-emulator
     - adb devices
     - adb shell input keyevent 82 &
-    - test $AVD_SDK -ge 25 || export FLAG=-Pandroid.testInstrumentationRunnerArguments.notAnnotation=android.support.test.filters.LargeTest
+    - ./gradlew installFullDebug
+    - adb shell am start -n org.fdroid.fdroid.debug/org.fdroid.fdroid.views.main.MainActivity
+    - if [ $AVD_SDK -lt 25 ] || ! emulator -accel-check; then
+          export FLAG=-Pandroid.testInstrumentationRunnerArguments.notAnnotation=androidx.test.filters.LargeTest;
+      fi
     - ./gradlew connectedFullDebugAndroidTest $FLAG
-      || ./gradlew connectedFullDebugAndroidTest $FLAG
-      || ./gradlew connectedFullDebugAndroidTest $FLAG
-      || (adb -e logcat -d > logcat.txt; exit 1)
 
-connected 22 default armeabi-v7a:
-  retry: 1
+no-accel 22 default x86:
   <<: *test-template
   <<: *connected-template
 
@@ -129,35 +110,17 @@ connected 22 default armeabi-v7a:
   tags:
     - fdroid
     - kvm
-  allow_failure: true
   only:
-    - branches@eighthave/fdroidclient
+    variables:
+      - $RUN_KVM_JOBS
   <<: *test-template
   <<: *connected-template
 
-connected 23 default x86:
+kvm 29 microg x86_64:
   <<: *kvm-template
 
-connected 25 default x86:
-  <<: *kvm-template
-
-connected 26 google_apis x86:
-  <<: *kvm-template
-  only:
-    - branches@fdroid/fdroidclient
-    - branches@eighthave/fdroidclient
-
-connected 27 google_apis_playstore x86:
-  <<: *kvm-template
-
-connected 28 default x86_64:
-  <<: *kvm-template
-
-connected 29 default x86_64:
-  <<: *kvm-template
-
-
 deploy_nightly:
+  extends: .base
   stage: deploy
   only:
     - master
@@ -177,8 +140,3 @@ deploy_nightly:
     # build the APKs!
     - ./gradlew assembleDebug
     - fdroid nightly -v
-
-after_script:
-    # this file changes every time but should not be cached
-    - rm -f $GRADLE_USER_HOME/caches/modules-2/modules-2.lock
-    - rm -fr $GRADLE_USER_HOME/caches/*/plugin-resolution/

CHANGELOG.md

@@ -1,3 +1,155 @@
+### 1.13-alpha1 (2021-06-02)
+
+* Stop repeated updates of Trichrome Library
+
+* More changes to follow Material Design (@proletarius101)
+
+* Improve OpenCollective badge (@ConnyDuck)
+
+### 1.13-alpha0 (2021-04-22)
+
+* Theme support tied to built-in Android themes (@proletarius101)
+
+* New top banner notifications: "No Internet" and "No Data or WiFi enabled"
+
+* Improved handling of USB-OTG and SD Card repos and mirrors
+
+### 1.12.1 (2021-04-12)
+
+* Fix trove4j verification error
+
+### 1.12 (2021-04-06)
+
+* Sync translations
+
+### 1.12-alpha3 (2021-03-10)
+
+* Opt-in F-Droid Metrics
+
+### 1.12-alpha2 (2021-03-03)
+
+* Overhaul clean up of cached files
+
+* Support updating "shared library packages" like Trichrome (@uldiniad)
+
+### 1.12-alpha1 (2021-02-25)
+
+* Add extra sanitation to search terms to prevent vulnerabilities.
+
+* Fix Nearby Swap's close button (@proletarius101)
+
+* Bump to compileSdkVersion 29 to support Java8
+
+* Set up WorkManager on demand to avoid slowing down starts
+
+* Prefer system keys when APKs are signed by them (@glennmen)
+
+### 1.12-alpha0 (2021-02-08)
+
+* App description localization now fully respects lists of languages in Android
+  Language Settings
+
+* Latest Tab lists results based on the Language Settings
+
+* Latest Tab now shows results ordered newest first (@TheLastProject @IzzySoft)
+
+* Theme support modernized and tied to the built-in Android themes (@proletarius101)
+
+* Search results greatly improved (@Tvax @gcbrown76)
+
+* Let Android efficiently schedule background cache cleanup operations (@Isira-Seneviratne)
+
+* Overhaul repo URL parsing for reliable repo adding (@projectgus)
+
+### 1.11 (2020-12-29)
+
+* Improved linkifying of URLs in app descriptions
+
+* Improved handling of SDCards and USG-OTG in Nearby
+
+* Modernized code and switched PNGs to vectors (thanks @isira-seneviratne!)
+
+* Recognize longer repo URLs to support GitCDN/RawGit/etc mirrors
+
+### 1.10 (2020-10-20)
+
+* Improved language selection with multiple locales
+  (thanks @spacecowboy and @bubu!)
+
+### 1.10-alpha1 (2020-09-29)
+
+* use notification channels for fine-grained control (@Isira-Seneviratne)
+
+### 1.10-alpha0 (2020-07-20)
+
+* Latest Tab will show better results on non-English devices
+
+* updates to core libraries (Jackson, androidx, gradle, etc)
+
+* use Gradle's new dependency verification
+
+* polish whitelabeling support
+
+### 1.9 (2020-06-25)
+
+* Removed "Android App Link" support since it cannot work with
+  F-Droid, and it was triggering DNS leaks.
+
+* Archive Repos are now lower priority than the Repo (higher on the
+  Manage Repos screen), fixing issues where it looked for icons,
+  screenshots and other information in the Archive rather than the
+  Repo itself.
+
+* Fixed hopefully all occurrences where F-Droid client couldn't show an icon.
+  The remaining cases of missing icons are now caused either by 
+  icons not included in upstream repo or by temporary network failures.
+  (After updating this requires one additional repo update to take effect.)
+
+* Fixed a problem where repository updates would never trigger
+  when either "Over Data" or "Over Wifi" were disabled.
+
+* Support OpenCollective donation option and highlight 
+  free software donation platforms
+
+* Fix for when the app update button wasn't showing up or working 
+  in some cases (thanks @di72nn)
+
+* Stop cropping feature header image (thanks @ByteHamster!)
+
+* Make navigation bar match dark mode (thanks @MatthieuB!)
+
+* Cleaned out obsolete code (thanks @Isira-Seneviratne!)
+
+### 1.8-alpha2 (2020-02-04)
+
+* stop showing Unknown Sources with Privileged Extension on Android 10 #1833
+
+* add standard ripple effect to links on app details activity
+
+* fix displaying default icon for apps without icons
+
+### 1.8-alpha1 (2020-01-10)
+
+* handle Android 10 permission config to stop Unknown Sources prompts
+
+* keyboard opens when search is cleared
+
+* translation sync with Android strings
+
+* force common repo domains to HTTPS (GitLab, GitHub, Amazon)
+
+### 1.8-alpha0 (2019-11-20)
+
+* fix seekbar preference on recent Android versions (thanks @dkanada)
+
+* handle API 29 split-permissions: fine location now implies coarse location
+
+* define backup rules to avoid saving the swap repo
+
+### 1.7.1 (2019-07-31)
+
+* fix crashes from ACRA report emails
+
 ### 1.7 (2019-07-06)
 
 * fix crash in Panic Settings

CONTRIBUTING.md

@@ -26,14 +26,16 @@ track of modifications and fuzzy translations. Applying translations manually
 skips all of the fixes and checks, and overrides the fuzzy state of strings.
 
 Note that you cannot change the English strings on Weblate. If you have any
-suggestions on how to improve them, open a merge request like you would if you
-were making code changes. This way the changes can be reviewed before the
-source strings on Weblate are changed.
+suggestions on how to improve them, open an issue or merge request like you
+would if you were making code changes. This way the changes can be reviewed
+before the source strings on Weblate are changed.
+
 
 ## Code Style
 
-We follow the [Android Java style](https://source.android.com/source/code-style.html).
-Some key points:
+We follow the default Android Studio code formatter (e.g. `Ctrl-Alt-L`).  This
+should be more or less the same as [Android Java
+style](https://source.android.com/source/code-style.html).  Some key points:
 
 * Four space indentation
 * UTF-8 source files
@@ -45,76 +47,35 @@ Some key points:
 * Braces are always used after if, for and while
 
 The current code base doesn't follow it entirely, but new code should follow
-it. We enforce some of these, but not all, via checkstyle.
+it. We enforce some of these, but not all, via `./gradlew checkstyle`.
 
-## Debugging
-
-To get all the logcat messages by F-Droid, you can run:
-
-    adb logcat | grep `adb shell ps | grep org.fdroid.fdroid | cut -c10-15`
-
-## Building tips
-
-* Use gradle with `--daemon` if you are going to build F-Droid multiple times.
-* If you get a message like `Could not find com.android.support:support-...`,
-  make sure that you have the latest Android support maven repository.
-* When building as part of AOSP with `Android.mk`, make sure you have a
-  recent version of Gradle installed as `gradlew` will not be used.
 
 ## Running the test suite
 
+Before pushing commits to a merge request, make sure this passes:
+
+    ./gradlew checkstyle pmd lint
+
 In order to run the F-Droid test suite, you will need to have either a real device
 connected via `adb`, or an emulator running. Then, execute the following from the
 command line:
 
     ./gradlew check
 
-Note that the CI already runs the tests on an emulator, so you don't
-necessarily have to do this yourself if you open a merge request as the tests
-will get run.
+Many important tests require a device or emulator, but do not work in GitLab CI.
+That mean they need to be run locally, and that is usually easiest in Android
+Studio rather than the command line.
 
-### Running tests in Android Studio
+For a quick way to run a specific JUnit/Robolectric test:
 
-Later versions of Android Studio require tests to be run with a "Working directory"
-of `$MODULE_DIR$`.
-[To make this the default behaviour](https://code.google.com/p/android/issues/detail?id=158015#c11),
-close any projects to get the Welcome dialog. Then choose _Configure > Project Defaults >
-Run Configurations > Defaults > Android JUnit_, and change "Working directory"
-to `$MODULE_DIR$`. If you already have a project setup in Android Studio, you
-may also need to change the default in _Run > Edit Configurations... > Defaults >
-Android JUnit_.
+    ./gradlew testFullDebugUnitTest --tests *LocaleSelectionTest*
 
-## Versioning
+For a quick way to run a specific emulator test:
 
-Each stable version follows the `X.Y` pattern. Hotfix releases - i.e. when a
-stable has an important bug that needs immediate fixing - will follow the
-`X.Y.Z` pattern.
+	./gradlew connectedFullDebugAndroidTest \
+        -Pandroid.testInstrumentationRunnerArguments.class=org.fdroid.fdroid.MainActivityExpressoTest
 
-Before each stable release, a number of alpha releases will be released. They
-will follow the pattern `X.Y-alphaN`, where `N` is the current alpha number.
-These will usually include changes and new features that have not been tested
-enough for a stable release, so use at your own risk. Testers and reporters
-are very welcome.
 
-The version codes use a number of digits per each of these keys: `XXXYYYZNN`.
-So for example, 1.3.1 would be `1003150` and 0.95-alpha13 would be `95013`
-(leading zeros are omitted).
+## Making releases
 
-Note that we use a trailing `50` for actual stable releases, so alphas are
-limited to `-alpha49`.
-
-This is an example of a release process for **0.95**:
-
-* We are currently at stable **0.94**
-* **0.95-alpha1** is released
-* **0.95-alpha2** is released
-* **0.95-alpha3** is released
-* `stable-v0.95` is branched and frozen
-* **0.95** is released
-* A bug is reported on the stable release and fixed
-* **0.95.1** is released with only that fix
-
-As soon as a stable is tagged, master will move on to `-alpha0` on the next
-version. This is a temporary measure - until `-alpha1` is released - so that
-moving from stable to master doesn't require a downgrade. `-alpha0` versions
-will not be tagged nor released.
+See https://gitlab.com/fdroid/wiki/-/wikis/Internal/Release-Process#fdroidclient

FUNDING.yml

@@ -0,0 +1,11 @@
+---
+liberapay: F-Droid-Data
+open_collective: F-Droid
+github:
+    - f-droid
+    - eighthave
+custom:
+    - https://f-droid.org/donate/
+    - https://www.hellotux.com/f-droid
+    - https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=E2FCXCT6837GL
+    - https://blockchain.info/address/15u8aAPK4jJ5N8wpWJ5gutAyyeHtKX5i18

README.md

@@ -1,6 +1,6 @@
 # F-Droid Client
 
-[![build status](https://gitlab.com/fdroid/fdroidclient/badges/master/build.svg)](https://gitlab.com/fdroid/fdroidclient/builds)
+[![build status](https://gitlab.com/fdroid/fdroidclient/badges/master/pipeline.svg)](https://gitlab.com/fdroid/fdroidclient/-/jobs)
 [![Translation status](https://hosted.weblate.org/widgets/f-droid/-/svg-badge.svg)](https://hosted.weblate.org/engage/f-droid/)
 
 Client for [F-Droid](https://f-droid.org), the Free Software repository system

app/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 apply plugin: 'checkstyle'
 apply plugin: 'pmd'
 
-/* gets the version name from the latest Git tag, stripping the leading v off */
+/* gets the version name from the latest Git tag */
 def getVersionName = { ->
     def stdout = new ByteArrayOutputStream()
     exec {
@@ -12,8 +12,8 @@ def getVersionName = { ->
     return stdout.toString().trim()
 }
 
-def isCi = "true".equals(System.getenv("CI"))
-def preDexEnabled = "true".equals(System.getProperty("pre-dex", "true"))
+def isCi = "true" == System.getenv("CI")
+def preDexEnabled = "true" == System.getProperty("pre-dex", "true")
 
 def fullApplicationId = "org.fdroid.fdroid"
 def basicApplicationId = "org.fdroid.basic"
@@ -21,14 +21,16 @@ def basicApplicationId = "org.fdroid.basic"
 def privilegedExtensionApplicationId = '"org.fdroid.fdroid.privileged"'
 
 android {
-    compileSdkVersion 27
-    buildToolsVersion '27.0.3'
+    compileSdkVersion 30
 
     defaultConfig {
-        versionCode 1007050
+        versionCode 1013001
         versionName getVersionName()
 
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
+        minSdkVersion 24
+        //noinspection ExpiredTargetSdkVersion
+        targetSdkVersion 28
         /*
           The Android Testing Support Library collects analytics to continuously improve the testing
           experience. More specifically, it uploads a hash of the package name of the application
@@ -36,6 +38,7 @@ android {
           passing the following argument to the test runner: disableAnalytics "true".
          */
         testInstrumentationRunnerArguments disableAnalytics: 'true'
+        vectorDrawables.useSupportLibrary = true
     }
 
     buildTypes {
@@ -43,9 +46,9 @@ android {
         // release builds before.
         all {
             minifyEnabled true
-            useProguard true
             shrinkResources true
             buildConfigField "String", "PRIVILEGED_EXTENSION_PACKAGE_NAME", privilegedExtensionApplicationId
+            buildConfigField "String", "ACRA_REPORT_EMAIL", '"reports@f-droid.org"' // String needs both quotes
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
             testProguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro', 'src/androidTest/proguard-rules.pro'
         }
@@ -73,6 +76,8 @@ android {
 
     compileOptions {
         compileOptions.encoding = "UTF-8"
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
     }
 
     aaptOptions {
@@ -97,6 +102,10 @@ android {
                     events "skipped", "failed", "standardOut", "standardError"
                     showStandardStreams = true
                 }
+                systemProperty 'robolectric.dependency.repo.url', 'https://repo1.maven.org/maven2'
+
+                // hack to avoid memory leak crashes
+                forkEvery = 1
             }
         }
     }
@@ -133,50 +142,56 @@ android {
 }
 
 dependencies {
-    implementation 'com.android.support:support-v4:27.1.1'
-    implementation 'com.android.support:appcompat-v7:27.1.1'
-    implementation 'com.android.support:gridlayout-v7:27.1.1'
-    implementation 'com.android.support:support-annotations:27.1.1'
-    implementation 'com.android.support:recyclerview-v7:27.1.1'
-    implementation 'com.android.support:cardview-v7:27.1.1'
-    implementation 'com.android.support:design:27.1.1'
-    implementation 'com.android.support:support-vector-drawable:27.1.1'
-    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
-    implementation 'com.android.support:palette-v7:27.1.1'
-    implementation 'com.android.support:preference-v14:27.1.1'
+    implementation 'androidx.appcompat:appcompat:1.3.0'
+    implementation 'androidx.preference:preference:1.1.1'
+    implementation 'androidx.gridlayout:gridlayout:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.1.0'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'androidx.vectordrawable:vectordrawable:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'androidx.palette:palette:1.0.0'
+    implementation 'androidx.work:work-runtime:2.4.0'
+
+    implementation 'com.google.android.material:material:1.3.0'
 
     implementation 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
     implementation 'com.google.zxing:core:3.3.3'
-    implementation 'info.guardianproject.netcipher:netcipher:2.0.0-beta1'
+    implementation 'info.guardianproject.netcipher:netcipher:2.2.0-alpha'
     implementation 'info.guardianproject.panic:panic:1.0'
     implementation 'commons-io:commons-io:2.6'
     implementation 'commons-net:commons-net:3.6'
     implementation 'ch.acra:acra:4.9.1'
-    implementation 'io.reactivex:rxjava:1.1.0'
     implementation 'com.hannesdorfmann:adapterdelegates3:3.0.1'
-    implementation 'com.ashokvarma.android:bottom-navigation-bar:2.0.5'
 
-    implementation 'com.fasterxml.jackson.core:jackson-core:2.8.11'
-    implementation 'com.fasterxml.jackson.core:jackson-annotations:2.8.11'
-    implementation 'com.fasterxml.jackson.core:jackson-databind:2.8.11'
+    implementation 'io.reactivex.rxjava3:rxandroid:3.0.0'
+    implementation 'io.reactivex.rxjava3:rxjava:3.0.9'
 
-    implementation 'org.bouncycastle:bcprov-jdk15on:1.60'
-    fullImplementation 'org.bouncycastle:bcpkix-jdk15on:1.60'
+    implementation 'com.fasterxml.jackson.core:jackson-core:2.11.1'
+    implementation 'com.fasterxml.jackson.core:jackson-annotations:2.11.1'
+    implementation 'com.fasterxml.jackson.core:jackson-databind:2.11.1'
+
+    implementation 'org.bouncycastle:bcprov-jdk15on:1.65'
+    fullImplementation 'org.bouncycastle:bcpkix-jdk15on:1.65'
     fullImplementation 'cc.mvdan.accesspoint:library:0.2.0'
     fullImplementation 'org.jmdns:jmdns:3.5.5'
     fullImplementation 'org.nanohttpd:nanohttpd:2.3.1'
 
-    testImplementation 'org.robolectric:robolectric:3.8'
-    testImplementation "com.android.support.test:monitor:1.0.2"
-    testImplementation 'org.bouncycastle:bcprov-jdk15on:1.60'
-    testImplementation 'junit:junit:4.12'
-    testImplementation 'org.mockito:mockito-core:2.7.22'
+    testImplementation 'androidx.test:core:1.3.0'
+    testImplementation 'junit:junit:4.13.1'
+    testImplementation 'org.robolectric:robolectric:4.3'
+    testImplementation 'org.mockito:mockito-core:3.3.3'
+    testImplementation 'org.hamcrest:hamcrest:2.2'
+    testImplementation 'org.bouncycastle:bcprov-jdk15on:1.65'
 
-    androidTestImplementation 'com.android.support:support-annotations:27.1.1'
-    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
-    androidTestImplementation 'com.android.support.test:runner:1.0.2'
-    androidTestImplementation 'com.android.support.test:rules:1.0.2'
-    androidTestImplementation 'com.android.support.test.uiautomator:uiautomator-v18:2.1.3'
+    androidTestImplementation 'androidx.arch.core:core-testing:2.1.0'
+    androidTestImplementation 'androidx.test:core:1.3.0'
+    androidTestImplementation 'androidx.test:runner:1.3.0'
+    androidTestImplementation 'androidx.test:rules:1.3.0'
+    androidTestImplementation 'androidx.test:monitor:1.3.0'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+    androidTestImplementation 'androidx.test.uiautomator:uiautomator:2.2.0'
+    androidTestImplementation 'androidx.work:work-testing:2.4.0'
 }
 
 checkstyle {
@@ -192,7 +207,7 @@ task checkstyle(type: Checkstyle) {
 }
 
 pmd {
-    toolVersion = '5.5.1'
+    toolVersion = '6.20.0'
     consoleOutput = true
 }
 
@@ -202,7 +217,6 @@ task pmdMain(type: Pmd) {
     ruleSets = [] // otherwise defaults clash with the list in rules.xml
     source 'src/main/java'
     include '**/*.java'
-    exclude '**/kellinwood/**/*.java'
 }
 
 task pmdTest(type: Pmd) {

app/proguard-rules.pro

@@ -4,13 +4,11 @@
 -keep class org.fdroid.fdroid.** {*;}
 -dontskipnonpubliclibraryclassmembers
 -dontwarn android.test.**
--dontwarn com.android.support.test.**
 
 -dontwarn javax.naming.**
 -dontwarn org.slf4j.**
 -dontnote org.apache.http.**
 -dontnote android.net.http.**
--dontnote android.support.**
 -dontnote **ILicensingService
 
 # Needed for espresso https://stackoverflow.com/a/21706087
@@ -33,24 +31,6 @@
     public *;
 }
 
-# Samsung Android 4.2 bug
-# https://code.google.com/p/android/issues/detail?id=78377
--keepnames class !android.support.v7.internal.view.menu.**, ** {*;}
-
--keep public class android.support.v7.widget.** {*;}
--keep public class android.support.v7.internal.widget.** {*;}
-
--keep public class * extends android.support.v4.view.ActionProvider {
-    public <init>(android.content.Context);
-}
-
-# The rxjava library depends on sun.misc.Unsafe, which is unavailable on Android
-# The rxjava team is aware of this, and mention in the docs that they only use
-# the unsafe functionality if the platform supports it.
-#  - https://github.com/ReactiveX/RxJava/issues/1415#issuecomment-48390883
-#  - https://github.com/ReactiveX/RxJava/blob/1.x/src/main/java/rx/internal/util/unsafe/UnsafeAccess.java#L23
--dontwarn rx.internal.util.**
-
 -keepattributes *Annotation*,EnclosingMethod,Signature
 -keepnames class com.fasterxml.jackson.** { *; }
 -dontwarn com.fasterxml.jackson.databind.ext.**
@@ -59,4 +39,9 @@
 public static final org.codehaus.jackson.annotate.JsonAutoDetect$Visibility *; }
 -keep public class your.class.** {
   *;
+}
+
+# This is necessary so that RemoteWorkManager can be initialized (also marked with @Keep)
+-keep class androidx.work.multiprocess.RemoteWorkManagerClient {
+    public <init>(...);
 }

app/src/androidTest/AndroidManifest.xml

@@ -1,17 +1,24 @@
 <?xml version="1.0" encoding="utf-8"?>
+
 <!-- package name must be unique so suffix with "tests" so package loader doesn't ignore us -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          xmlns:tools="http://schemas.android.com/tools"
-          package="org.fdroid.fdroid.tests"
-          android:versionCode="1"
-          android:versionName="1.0">
-    <uses-sdk tools:overrideLibrary="android.support.test.uiautomator.v18"/>
+    xmlns:tools="http://schemas.android.com/tools"
+    package="org.fdroid.fdroid.tests"
+    android:versionCode="1"
+    android:versionName="1.0">
+
+    <uses-sdk tools:overrideLibrary="android_libs.ub_uiautomator" />
+
     <!-- We add an application tag here just so that we can indicate that
          this package needs to link against the android.test library,
          which is needed when building test cases. -->
     <application>
-        <uses-library android:name="android.test.runner"/>
+        <uses-library
+            android:name="android.test.runner"
+            android:required="false" />
     </application>
-    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
 </manifest>

app/src/androidTest/java/org/fdroid/fdroid/AssetUtils.java

@@ -1,8 +1,8 @@
 package org.fdroid.fdroid;
 
 import android.content.Context;
-import android.support.annotation.Nullable;
 import android.util.Log;
+import androidx.annotation.Nullable;
 
 import java.io.File;
 import java.io.FileOutputStream;
@@ -16,6 +16,9 @@ public class AssetUtils {
 
     private static final String TAG = "Utils";
 
+    /**
+     * This requires {@link Context} from {@link android.app.Instrumentation#getContext()}
+     */
     @Nullable
     public static File copyAssetToDir(Context context, String assetName, File directory) {
         File tempFile = null;
@@ -28,6 +31,7 @@ public class AssetUtils {
             output = new FileOutputStream(tempFile);
             Utils.copy(input, output);
         } catch (IOException e) {
+            Log.e(TAG, "Check the context is from Instrumentation.getContext()");
             fail(e.getMessage());
         } finally {
             Utils.closeQuietly(output);

app/src/androidTest/java/org/fdroid/fdroid/CleanCacheServiceTest.java

@@ -1,65 +0,0 @@
-package org.fdroid.fdroid;
-
-import android.app.Instrumentation;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
-
-import org.apache.commons.io.FileUtils;
-import org.fdroid.fdroid.compat.FileCompatTest;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
-import java.io.File;
-import java.io.IOException;
-
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
-
-@RunWith(AndroidJUnit4.class)
-public class CleanCacheServiceTest {
-
-    public static final String TAG = "CleanCacheServiceTest";
-
-    @Test
-    public void testClearOldFiles() throws IOException, InterruptedException {
-        Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation();
-        File tempDir = FileCompatTest.getWriteableDir(instrumentation);
-        assertTrue(tempDir.isDirectory());
-        assertTrue(tempDir.canWrite());
-
-        File dir = new File(tempDir, "F-Droid-test.clearOldFiles");
-        FileUtils.deleteQuietly(dir);
-        assertTrue(dir.mkdirs());
-        assertTrue(dir.isDirectory());
-
-        File first = new File(dir, "first");
-        first.deleteOnExit();
-
-        File second = new File(dir, "second");
-        second.deleteOnExit();
-
-        assertFalse(first.exists());
-        assertFalse(second.exists());
-
-        assertTrue(first.createNewFile());
-        assertTrue(first.exists());
-
-        Thread.sleep(7000);
-        assertTrue(second.createNewFile());
-        assertTrue(second.exists());
-
-        CleanCacheService.clearOldFiles(dir, 3000);  // check all in dir
-        assertFalse(first.exists());
-        assertTrue(second.exists());
-
-        Thread.sleep(7000);
-        CleanCacheService.clearOldFiles(second, 3000);  // check just second file
-        assertFalse(first.exists());
-        assertFalse(second.exists());
-
-        // make sure it doesn't freak out on a non-existent file
-        File nonexistent = new File(tempDir, "nonexistent");
-        CleanCacheService.clearOldFiles(nonexistent, 1);
-        CleanCacheService.clearOldFiles(null, 1);
-    }
-}

app/src/androidTest/java/org/fdroid/fdroid/LocalizationTest.java

@@ -5,8 +5,8 @@ import android.content.Context;
 import android.content.res.AssetManager;
 import android.content.res.Configuration;
 import android.content.res.Resources;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
 import android.text.TextUtils;
 import android.util.DisplayMetrics;
 import android.util.Log;
@@ -179,6 +179,9 @@ public class LocalizationTest {
                         case "dd":
                             resources.getString(resId, 1, 2);
                             break;
+                        case "ds":
+                            resources.getString(resId, 1, "TWO");
+                            break;
                         case "dds":
                             resources.getString(resId, 1, 2, "THREE");
                             break;

app/src/androidTest/java/org/fdroid/fdroid/MainActivityEspressoTest.java

@@ -5,20 +5,23 @@ import android.app.ActivityManager;
 import android.app.Instrumentation;
 import android.content.Context;
 import android.os.Build;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.espresso.IdlingPolicies;
-import android.support.test.espresso.ViewInteraction;
-import android.support.test.filters.LargeTest;
-import android.support.test.rule.ActivityTestRule;
-import android.support.test.rule.GrantPermissionRule;
-import android.support.test.runner.AndroidJUnit4;
-import android.support.test.uiautomator.UiDevice;
-import android.support.test.uiautomator.UiObject;
-import android.support.test.uiautomator.UiObjectNotFoundException;
-import android.support.test.uiautomator.UiSelector;
+
+import androidx.core.content.ContextCompat;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.filters.LargeTest;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.espresso.IdlingPolicies;
+import androidx.test.espresso.ViewInteraction;
+import androidx.test.rule.ActivityTestRule;
+import androidx.test.rule.GrantPermissionRule;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.uiautomator.UiDevice;
+import androidx.test.uiautomator.UiObject;
+import androidx.test.uiautomator.UiObjectNotFoundException;
+import androidx.test.uiautomator.UiSelector;
 import android.util.Log;
 import android.view.View;
-import org.fdroid.fdroid.views.BannerUpdatingRepos;
+import org.fdroid.fdroid.views.StatusBanner;
 import org.fdroid.fdroid.views.main.MainActivity;
 import org.hamcrest.Matchers;
 import org.junit.After;
@@ -32,19 +35,19 @@ import org.junit.runner.RunWith;
 import java.io.IOException;
 import java.util.concurrent.TimeUnit;
 
-import static android.support.test.espresso.Espresso.onView;
-import static android.support.test.espresso.action.ViewActions.click;
-import static android.support.test.espresso.action.ViewActions.swipeDown;
-import static android.support.test.espresso.action.ViewActions.swipeLeft;
-import static android.support.test.espresso.action.ViewActions.swipeRight;
-import static android.support.test.espresso.action.ViewActions.swipeUp;
-import static android.support.test.espresso.action.ViewActions.typeText;
-import static android.support.test.espresso.assertion.ViewAssertions.doesNotExist;
-import static android.support.test.espresso.assertion.ViewAssertions.matches;
-import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
-import static android.support.test.espresso.matcher.ViewMatchers.withContentDescription;
-import static android.support.test.espresso.matcher.ViewMatchers.withId;
-import static android.support.test.espresso.matcher.ViewMatchers.withText;
+import static androidx.test.espresso.Espresso.onView;
+import static androidx.test.espresso.action.ViewActions.click;
+import static androidx.test.espresso.action.ViewActions.swipeDown;
+import static androidx.test.espresso.action.ViewActions.swipeLeft;
+import static androidx.test.espresso.action.ViewActions.swipeRight;
+import static androidx.test.espresso.action.ViewActions.swipeUp;
+import static androidx.test.espresso.action.ViewActions.typeText;
+import static androidx.test.espresso.assertion.ViewAssertions.doesNotExist;
+import static androidx.test.espresso.assertion.ViewAssertions.matches;
+import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static androidx.test.espresso.matcher.ViewMatchers.withContentDescription;
+import static androidx.test.espresso.matcher.ViewMatchers.withId;
+import static androidx.test.espresso.matcher.ViewMatchers.withText;
 import static org.hamcrest.Matchers.allOf;
 import static org.hamcrest.Matchers.not;
 import static org.junit.Assert.assertTrue;
@@ -88,7 +91,7 @@ public class MainActivityEspressoTest {
         } catch (IOException e) {
             e.printStackTrace();
         }
-        SystemAnimations.disableAll(InstrumentationRegistry.getTargetContext());
+        SystemAnimations.disableAll(ApplicationProvider.getApplicationContext());
 
         // dismiss the ANR or any other system dialogs that might be there
         UiObject button = new UiObject(new UiSelector().text("Wait").enabled(true));
@@ -101,7 +104,7 @@ public class MainActivityEspressoTest {
 
         Context context = instrumentation.getTargetContext();
         ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
-        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        ActivityManager activityManager = ContextCompat.getSystemService(context, ActivityManager.class);
         activityManager.getMemoryInfo(mi);
         long percentAvail = mi.availMem / mi.totalMem;
         Log.i(TAG, "RAM: " + mi.availMem + " / " + mi.totalMem + " = " + percentAvail);
@@ -109,7 +112,7 @@ public class MainActivityEspressoTest {
 
     @AfterClass
     public static void classTearDown() {
-        SystemAnimations.enableAll(InstrumentationRegistry.getTargetContext());
+        SystemAnimations.enableAll(ApplicationProvider.getApplicationContext());
     }
 
     public static boolean isEmulator() {
@@ -174,6 +177,7 @@ public class MainActivityEspressoTest {
     }
 
     @LargeTest
+    @Test
     public void showSettings() {
         ViewInteraction settingsBottonNavButton = onView(
                 allOf(withText(R.string.menu_settings), isDisplayed()));
@@ -204,10 +208,11 @@ public class MainActivityEspressoTest {
         onView(withId(R.id.version)).check(matches(isDisplayed()));
         onView(withId(R.id.ok_button)).perform(click());
 
-        onView(withId(R.id.list)).perform(swipeUp()).perform(swipeUp()).perform(swipeUp());
+        onView(withId(android.R.id.list_container)).perform(swipeUp()).perform(swipeUp()).perform(swipeUp());
     }
 
     @LargeTest
+    @Test
     public void showUpdates() {
         ViewInteraction updatesBottonNavButton = onView(allOf(withText(R.string.main_menu__updates), isDisplayed()));
         updatesBottonNavButton.perform(click());
@@ -215,6 +220,7 @@ public class MainActivityEspressoTest {
     }
 
     @LargeTest
+    @Test
     public void startSwap() {
         if (!BuildConfig.FLAVOR.startsWith("full")) {
             return;
@@ -230,6 +236,7 @@ public class MainActivityEspressoTest {
     }
 
     @LargeTest
+    @Test
     public void showCategories() {
         if (!BuildConfig.FLAVOR.startsWith("full")) {
             return;
@@ -255,11 +262,12 @@ public class MainActivityEspressoTest {
     }
 
     @LargeTest
+    @Test
     public void showLatest() {
         if (!BuildConfig.FLAVOR.startsWith("full")) {
             return;
         }
-        onView(Matchers.<View>instanceOf(BannerUpdatingRepos.class)).check(matches(not(isDisplayed())));
+        onView(Matchers.<View>instanceOf(StatusBanner.class)).check(matches(not(isDisplayed())));
         onView(allOf(withText(R.string.menu_settings), isDisplayed())).perform(click());
         onView(allOf(withText(R.string.main_menu__latest_apps), isDisplayed())).perform(click());
         onView(allOf(withId(R.id.swipe_to_refresh), isDisplayed()))
@@ -277,6 +285,7 @@ public class MainActivityEspressoTest {
     }
 
     @LargeTest
+    @Test
     public void showSearch() {
         onView(allOf(withText(R.string.menu_settings), isDisplayed())).perform(click());
         onView(withId(R.id.fab_search)).check(doesNotExist());

app/src/androidTest/java/org/fdroid/fdroid/Netstat.java

@@ -123,7 +123,7 @@ public class Netstat {
         try {
             BufferedReader in = new BufferedReader(new FileReader("/proc/net/tcp"));
             String line;
-            while ((line = in.readLine()) != null) {
+            while ((line = in.readLine()) != null) { // NOPMD
                 Matcher matcher = NET_PATTERN.matcher(line);
                 if (matcher.find()) {
                     final Connection c = new Connection();
@@ -156,7 +156,7 @@ public class Netstat {
         try {
             BufferedReader in = new BufferedReader(new FileReader("/proc/net/udp"));
             String line;
-            while ((line = in.readLine()) != null) {
+            while ((line = in.readLine()) != null) { // NOPMD
                 Matcher matcher = NET_PATTERN.matcher(line);
                 if (matcher.find()) {
                     final Connection c = new Connection();
@@ -189,7 +189,7 @@ public class Netstat {
         try {
             BufferedReader in = new BufferedReader(new FileReader("/proc/net/raw"));
             String line;
-            while ((line = in.readLine()) != null) {
+            while ((line = in.readLine()) != null) { // NOPMD
                 Matcher matcher = NET_PATTERN.matcher(line);
                 if (matcher.find()) {
                     final Connection c = new Connection();

app/src/androidTest/java/org/fdroid/fdroid/UiWatchers.java

@@ -16,11 +16,11 @@
 
 package org.fdroid.fdroid;
 
-import android.support.test.uiautomator.UiDevice;
-import android.support.test.uiautomator.UiObject;
-import android.support.test.uiautomator.UiObjectNotFoundException;
-import android.support.test.uiautomator.UiSelector;
-import android.support.test.uiautomator.UiWatcher;
+import androidx.test.uiautomator.UiDevice;
+import androidx.test.uiautomator.UiObject;
+import androidx.test.uiautomator.UiObjectNotFoundException;
+import androidx.test.uiautomator.UiSelector;
+import androidx.test.uiautomator.UiWatcher;
 import android.util.Log;
 
 import java.util.ArrayList;

app/src/androidTest/java/org/fdroid/fdroid/compat/FileCompatTest.java

@@ -4,8 +4,8 @@ import android.app.Instrumentation;
 import android.content.Context;
 import android.os.Build;
 import android.os.Environment;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
 import android.util.Log;
 
 import org.fdroid.fdroid.AssetUtils;

app/src/androidTest/java/org/fdroid/fdroid/installer/ApkVerifierTest.java

@@ -22,10 +22,10 @@ package org.fdroid.fdroid.installer;
 import android.app.Instrumentation;
 import android.net.Uri;
 import android.os.Build;
-import android.support.annotation.NonNull;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
 import android.util.Log;
+import androidx.annotation.NonNull;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
 import org.fdroid.fdroid.AssetUtils;
 import org.fdroid.fdroid.Utils;
 import org.fdroid.fdroid.compat.FileCompatTest;
@@ -113,7 +113,7 @@ public class ApkVerifierTest {
         Apk apk = new Apk();
         apk.packageName = "org.fdroid.permissions.sdk14";
         apk.targetSdkVersion = 14;
-        String[] noPrefixPermissions = new String[]{
+        ArrayList<String> noPrefixPermissionsList = new ArrayList<>(Arrays.asList(
                 "AUTHENTICATE_ACCOUNTS",
                 "MANAGE_ACCOUNTS",
                 "READ_PROFILE",
@@ -129,8 +129,13 @@ public class ApkVerifierTest {
                 "READ_SYNC_SETTINGS",
                 "WRITE_SYNC_SETTINGS",
                 "WRITE_CALL_LOG", // implied-permission!
-                "READ_CALL_LOG", // implied-permission!
-        };
+                "READ_CALL_LOG" // implied-permission!
+        ));
+        if (Build.VERSION.SDK_INT >= 29) {
+            noPrefixPermissionsList.add("android.permission.ACCESS_MEDIA_LOCATION");
+        }
+        String[] noPrefixPermissions = noPrefixPermissionsList.toArray(new String[0]);
+
         for (int i = 0; i < noPrefixPermissions.length; i++) {
             noPrefixPermissions[i] = RepoXMLHandler.fdroidToAndroidPermission(noPrefixPermissions[i]);
         }
@@ -177,7 +182,7 @@ public class ApkVerifierTest {
         Apk apk = new Apk();
         apk.packageName = "org.fdroid.permissions.sdk14";
         apk.targetSdkVersion = 14;
-        apk.requestedPermissions = new String[]{
+        TreeSet<String> expectedSet = new TreeSet<>(Arrays.asList(
                 "android.permission.AUTHENTICATE_ACCOUNTS",
                 "android.permission.MANAGE_ACCOUNTS",
                 "android.permission.READ_PROFILE",
@@ -193,8 +198,12 @@ public class ApkVerifierTest {
                 "android.permission.READ_SYNC_SETTINGS",
                 "android.permission.WRITE_SYNC_SETTINGS",
                 "android.permission.WRITE_CALL_LOG", // implied-permission!
-                "android.permission.READ_CALL_LOG", // implied-permission!
-        };
+                "android.permission.READ_CALL_LOG"// implied-permission!
+        ));
+        if (Build.VERSION.SDK_INT >= 29) {
+            expectedSet.add("android.permission.ACCESS_MEDIA_LOCATION");
+        }
+        apk.requestedPermissions = expectedSet.toArray(new String[0]);
 
         Uri uri = Uri.fromFile(sdk14Apk);
 
@@ -371,6 +380,9 @@ public class ApkVerifierTest {
                     "android.permission.MANAGE_ACCOUNTS"
             ));
         }
+        if (Build.VERSION.SDK_INT >= 29) {
+            expectedSet.add("android.permission.ACCESS_MEDIA_LOCATION");
+        }
         Apk apk = actualDetails.apks.get(1);
         Log.i(TAG, "APK: " + apk.apkName);
         HashSet<String> actualSet = new HashSet<>(Arrays.asList(apk.requestedPermissions));
@@ -407,6 +419,9 @@ public class ApkVerifierTest {
                 "org.dmfs.permission.READ_TASKS",
                 "org.dmfs.permission.WRITE_TASKS"
         ));
+        if (Build.VERSION.SDK_INT >= 29) {
+            expectedSet.add("android.permission.ACCESS_MEDIA_LOCATION");
+        }
         expectedPermissions = expectedSet.toArray(new String[expectedSet.size()]);
         apk = actualDetails.apks.get(2);
         Log.i(TAG, "APK: " + apk.apkName);

app/src/androidTest/java/org/fdroid/fdroid/nearby/BonjourManagerTest.java

@@ -1,17 +1,20 @@
 package org.fdroid.fdroid.nearby;
 
 import android.content.Context;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
+
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
 import org.fdroid.fdroid.FDroidApp;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import javax.jmdns.ServiceEvent;
-import javax.jmdns.ServiceListener;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
+import javax.jmdns.ServiceEvent;
+import javax.jmdns.ServiceListener;
+
 import static org.junit.Assert.assertTrue;
 
 @RunWith(AndroidJUnit4.class)
@@ -23,7 +26,7 @@ public class BonjourManagerTest {
 
     @Test
     public void testStartStop() throws InterruptedException {
-        Context context = InstrumentationRegistry.getTargetContext();
+        Context context = ApplicationProvider.getApplicationContext();
 
         FDroidApp.ipAddressString = LOCALHOST;
         FDroidApp.port = PORT;
@@ -65,7 +68,7 @@ public class BonjourManagerTest {
 
     @Test
     public void testRestart() throws InterruptedException {
-        Context context = InstrumentationRegistry.getTargetContext();
+        Context context = ApplicationProvider.getApplicationContext();
 
         FDroidApp.ipAddressString = LOCALHOST;
         FDroidApp.port = PORT;

app/src/androidTest/java/org/fdroid/fdroid/nearby/LocalHTTPDManagerTest.java

@@ -4,16 +4,18 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.filters.LargeTest;
-import android.support.test.runner.AndroidJUnit4;
-import android.support.v4.content.LocalBroadcastManager;
+
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.filters.LargeTest;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 import android.util.Log;
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.Netstat;
 import org.fdroid.fdroid.Utils;
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -40,7 +42,7 @@ public class LocalHTTPDManagerTest {
 
     @Before
     public void setUp() {
-        context = InstrumentationRegistry.getTargetContext();
+        context = ApplicationProvider.getApplicationContext();
         lbm = LocalBroadcastManager.getInstance(context);
 
         FDroidApp.ipAddressString = LOCALHOST;
@@ -64,6 +66,7 @@ public class LocalHTTPDManagerTest {
         lbm.unregisterReceiver(errorReceiver);
     }
 
+    @Ignore
     @Test
     public void testStartStop() throws InterruptedException {
         Log.i(TAG, "testStartStop");

app/src/androidTest/java/org/fdroid/fdroid/updater/SwapRepoEmulatorTest.java

@@ -6,8 +6,8 @@ import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.ResolveInfo;
 import android.os.Looper;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.filters.LargeTest;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.filters.LargeTest;
 import android.text.TextUtils;
 import android.util.Log;
 import org.fdroid.fdroid.BuildConfig;
@@ -27,6 +27,7 @@ import org.fdroid.fdroid.nearby.LocalHTTPD;
 import org.fdroid.fdroid.nearby.LocalRepoKeyStore;
 import org.fdroid.fdroid.nearby.LocalRepoManager;
 import org.fdroid.fdroid.nearby.LocalRepoService;
+import org.junit.Ignore;
 import org.junit.Test;
 
 import java.io.File;
@@ -54,6 +55,7 @@ public class SwapRepoEmulatorTest {
     /**
      * @see org.fdroid.fdroid.nearby.WifiStateChangeService.WifiInfoThread#run()
      */
+    @Ignore
     @Test
     public void testSwap()
             throws IOException, LocalRepoKeyStore.InitException, IndexUpdater.UpdateException, InterruptedException {

app/src/androidTest/java/org/fdroid/fdroid/work/CleanCacheWorkerTest.java

@@ -0,0 +1,110 @@
+package org.fdroid.fdroid.work;
+
+import android.app.Instrumentation;
+import androidx.arch.core.executor.testing.InstantTaskExecutorRule;
+import androidx.test.filters.LargeTest;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.work.OneTimeWorkRequest;
+import androidx.work.WorkInfo;
+import com.google.common.util.concurrent.ListenableFuture;
+import org.apache.commons.io.FileUtils;
+import org.fdroid.fdroid.compat.FileCompatTest;
+import org.junit.Rule;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.concurrent.ExecutionException;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * This test cannot run on Robolectric unfortunately since it does not support
+ * getting the timestamps from the files completely.
+ * <p>
+ * This is marked with {@link LargeTest} because it always fails on the emulator
+ * tests on GitLab CI.  That excludes it from the test run there.
+ */
+@LargeTest
+public class CleanCacheWorkerTest {
+    public static final String TAG = "CleanCacheWorkerEmulatorTest";
+
+    @Rule
+    public InstantTaskExecutorRule instantTaskExecutorRule = new InstantTaskExecutorRule();
+
+    @Rule
+    public WorkManagerTestRule workManagerTestRule = new WorkManagerTestRule();
+
+    @Test
+    public void testWorkRequest() throws ExecutionException, InterruptedException {
+        OneTimeWorkRequest request = new OneTimeWorkRequest.Builder(CleanCacheWorker.class).build();
+        workManagerTestRule.workManager.enqueue(request).getResult();
+        ListenableFuture<WorkInfo> workInfo = workManagerTestRule.workManager.getWorkInfoById(request.getId());
+        assertEquals(WorkInfo.State.SUCCEEDED, workInfo.get().getState());
+    }
+
+    @Test
+    public void testClearOldFiles() throws IOException, InterruptedException {
+        Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation();
+        File tempDir = FileCompatTest.getWriteableDir(instrumentation);
+        assertTrue(tempDir.isDirectory());
+        assertTrue(tempDir.canWrite());
+
+        File dir = new File(tempDir, "F-Droid-test.clearOldFiles");
+        FileUtils.deleteQuietly(dir);
+        assertTrue(dir.mkdirs());
+        assertTrue(dir.isDirectory());
+
+        File first = new File(dir, "first");
+        first.deleteOnExit();
+
+        File second = new File(dir, "second");
+        second.deleteOnExit();
+
+        assertFalse(first.exists());
+        assertFalse(second.exists());
+
+        assertTrue(first.createNewFile());
+        assertTrue(first.exists());
+
+        Thread.sleep(7000);
+        assertTrue(second.createNewFile());
+        assertTrue(second.exists());
+
+        CleanCacheWorker.clearOldFiles(dir, 3000); // check all in dir
+        assertFalse(first.exists());
+        assertTrue(second.exists());
+
+        Thread.sleep(7000);
+        CleanCacheWorker.clearOldFiles(second, 3000); // check just second file
+        assertFalse(first.exists());
+        assertFalse(second.exists());
+
+        // make sure it doesn't freak out on a non-existent file
+        File nonexistent = new File(tempDir, "nonexistent");
+        CleanCacheWorker.clearOldFiles(nonexistent, 1);
+        CleanCacheWorker.clearOldFiles(null, 1);
+    }
+
+    /*
+    // TODO enable this once getImageCacheDir() can be mocked or provide a writable dir in the test
+    @Test
+    public void testDeleteOldIcons() throws IOException {
+        Context context = InstrumentationRegistry.getInstrumentation().getContext();
+        File imageCacheDir = Utils.getImageCacheDir(context);
+        imageCacheDir.mkdirs();
+        assertTrue(imageCacheDir.isDirectory());
+        File oldIcon = new File(imageCacheDir, "old.png");
+        assertTrue(oldIcon.createNewFile());
+        Assume.assumeTrue("test environment must be able to set LastModified time",
+                oldIcon.setLastModified(System.currentTimeMillis() - (DateUtils.DAY_IN_MILLIS * 370)));
+        File currentIcon = new File(imageCacheDir, "current.png");
+        assertTrue(currentIcon.createNewFile());
+        CleanCacheWorker.deleteOldIcons(context);
+        assertTrue(currentIcon.exists());
+        assertFalse(oldIcon.exists());
+    }
+     */
+}

app/src/androidTest/java/org/fdroid/fdroid/work/FDroidMetricsWorkerTest.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2021  Hans-Christoph Steiner <hans@eds.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package org.fdroid.fdroid.work;
+
+import androidx.arch.core.executor.testing.InstantTaskExecutorRule;
+import androidx.test.filters.LargeTest;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.work.OneTimeWorkRequest;
+import androidx.work.WorkInfo;
+import com.google.common.util.concurrent.ListenableFuture;
+import org.junit.Ignore;
+import org.junit.Rule;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.concurrent.ExecutionException;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * This actually runs {@link FDroidMetricsWorker} on a device/emulator and
+ * submits a report to https://metrics.cleaninsights.org
+ * <p>
+ * This is marked with {@link LargeTest} to exclude it from running on GitLab CI
+ * because it always fails on the emulator tests there.  Also, it actually submits
+ * a report.
+ */
+@LargeTest
+public class FDroidMetricsWorkerTest {
+    public static final String TAG = "FDroidMetricsWorkerTest";
+
+    @Rule
+    public InstantTaskExecutorRule instantTaskExecutorRule = new InstantTaskExecutorRule();
+
+    @Rule
+    public WorkManagerTestRule workManagerTestRule = new WorkManagerTestRule();
+
+    /**
+     * A test for easy manual testing.
+     */
+    @Ignore
+    @Test
+    public void testGenerateReport() throws IOException {
+        String json = FDroidMetricsWorker.generateReport(
+                InstrumentationRegistry.getInstrumentation().getTargetContext());
+        System.out.println(json);
+    }
+
+    @Test
+    public void testWorkRequest() throws ExecutionException, InterruptedException {
+        OneTimeWorkRequest request = new OneTimeWorkRequest.Builder(FDroidMetricsWorker.class).build();
+        workManagerTestRule.workManager.enqueue(request).getResult();
+        ListenableFuture<WorkInfo> workInfo = workManagerTestRule.workManager.getWorkInfoById(request.getId());
+        assertEquals(WorkInfo.State.SUCCEEDED, workInfo.get().getState());
+    }
+}

app/src/androidTest/java/org/fdroid/fdroid/work/WorkManagerTestRule.java

@@ -0,0 +1,33 @@
+package org.fdroid.fdroid.work;
+
+import android.app.Instrumentation;
+import android.content.Context;
+import android.util.Log;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.work.Configuration;
+import androidx.work.WorkManager;
+import androidx.work.testing.SynchronousExecutor;
+import androidx.work.testing.WorkManagerTestInitHelper;
+import org.junit.rules.TestWatcher;
+import org.junit.runner.Description;
+
+public class WorkManagerTestRule extends TestWatcher {
+    Context targetContext;
+    Context testContext;
+    Configuration configuration;
+    WorkManager workManager;
+
+    @Override
+    protected void starting(Description description) {
+        final Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation();
+        targetContext = instrumentation.getTargetContext();
+        testContext = instrumentation.getContext();
+        configuration = new Configuration.Builder()
+                .setMinimumLoggingLevel(Log.DEBUG)
+                .setExecutor(new SynchronousExecutor())
+                .build();
+
+        WorkManagerTestInitHelper.initializeTestWorkManager(targetContext, configuration);
+        workManager = WorkManager.getInstance(targetContext);
+    }
+}

app/src/androidTest/proguard-rules.pro

@@ -1,3 +1,7 @@
+-dontoptimize
+-dontwarn
+-dontobfuscate
+
 -dontwarn android.test.**
 -dontwarn android.support.test.**
 -dontnote junit.framework.**
@@ -14,3 +18,8 @@
 
 -keep class junit.** { *; }
 -dontwarn junit.**
+
+# This is necessary so that RemoteWorkManager can be initialized (also marked with @Keep)
+-keep class androidx.work.multiprocess.RemoteWorkManagerClient {
+    public <init>(...);
+}

app/src/basic/java/org/fdroid/fdroid/nearby/LocalRepoManager.java

@@ -0,0 +1,5 @@
+package org.fdroid.fdroid.nearby;
+
+public class LocalRepoManager {
+    public static final String[] WEB_ROOT_ASSET_FILES = {};
+}

app/src/basic/java/org/fdroid/fdroid/nearby/TreeUriScannerIntentService.java

@@ -19,14 +19,14 @@
 
 package org.fdroid.fdroid.nearby;
 
-import android.app.Activity;
+import androidx.appcompat.app.AppCompatActivity;
 import android.content.Intent;
 
 /**
  * Dummy version for basic app flavor.
  */
 public class TreeUriScannerIntentService {
-    public static void onActivityResult(Activity activity, Intent intent) {
+    public static void onActivityResult(AppCompatActivity activity, Intent intent) {
         throw new IllegalStateException("unimplemented");
     }
 }

app/src/basic/java/org/fdroid/fdroid/nearby/WifiStateChangeService.java

@@ -21,7 +21,7 @@ package org.fdroid.fdroid.nearby;
 
 import android.content.Context;
 import android.content.Intent;
-import android.support.annotation.Nullable;
+import androidx.annotation.Nullable;
 
 /**
  * Dummy version for basic app flavor.

app/src/basic/java/org/fdroid/fdroid/views/main/MainViewController.java

@@ -19,11 +19,11 @@
 
 package org.fdroid.fdroid.views.main;
 
-import android.support.annotation.Nullable;
-import android.support.v4.app.Fragment;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.RecyclerView;
 import android.widget.FrameLayout;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.RecyclerView;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.views.PreferencesFragment;
 import org.fdroid.fdroid.views.updates.UpdatesViewBinder;
@@ -49,10 +49,10 @@ class MainViewController extends RecyclerView.ViewHolder {
     }
 
     /**
-     * @see WhatsNewViewBinder
+     * @see LatestViewBinder
      */
-    public void bindWhatsNewView() {
-        new WhatsNewViewBinder(activity, frame);
+    public void bindLatestView() {
+        new LatestViewBinder(activity, frame);
     }
 
     /**

app/src/basic/java/org/fdroid/fdroid/views/main/NearbyViewBinder.java

@@ -1,9 +1,9 @@
 package org.fdroid.fdroid.views.main;
 
-import android.app.Activity;
+import android.content.Context;
 
 class NearbyViewBinder {
-    public static void updateUsbOtg(final Activity activity) {
+    public static void updateUsbOtg(Context context) {
         throw new IllegalStateException("unimplemented");
     }
 }

app/src/basic/res/menu/main_activity_screens.xml

@@ -6,7 +6,7 @@
     <!-- android:title and android:icon are set dynamically in MainActivity -->
     <item
             app:showAsAction="ifRoom|withText"
-            android:id="@+id/whats_new"/>
+            android:id="@+id/latest"/>
     <item
             app:showAsAction="ifRoom|withText"
             android:id="@+id/updates"/>

app/src/basic/res/xml/preferences.xml

@@ -1,30 +1,25 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v7.preference.PreferenceScreen
-        xmlns:android="http://schemas.android.com/apk/res/android">
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <android.support.v7.preference.PreferenceScreen android:title="@string/about_title">
-        <intent
-                android:action="android.intent.action.MAIN"
-                android:targetPackage="@string/applicationId"
-                android:targetClass="org.fdroid.fdroid.AboutActivity"/>
-    </android.support.v7.preference.PreferenceScreen>
+    <PreferenceScreen android:title="@string/about_title"
+        android:key="pref_about" />
 
-    <android.support.v7.preference.PreferenceCategory android:title="@string/preference_category__my_apps">
-        <android.support.v7.preference.PreferenceScreen android:title="@string/preference_manage_installed_apps">
+    <PreferenceCategory android:title="@string/preference_category__my_apps">
+        <PreferenceScreen android:title="@string/preference_manage_installed_apps">
             <intent
                     android:action="android.intent.action.MAIN"
                     android:targetPackage="@string/applicationId"
                     android:targetClass="org.fdroid.fdroid.views.installed.InstalledAppsActivity"/>
-        </android.support.v7.preference.PreferenceScreen>
-        <android.support.v7.preference.PreferenceScreen
+        </PreferenceScreen>
+        <PreferenceScreen
                 android:title="@string/menu_manage"
                 android:summary="@string/repositories_summary">
             <intent
                     android:action="android.intent.action.MAIN"
                     android:targetPackage="@string/applicationId"
                     android:targetClass="org.fdroid.fdroid.views.ManageReposActivity"/>
-        </android.support.v7.preference.PreferenceScreen>
-        <android.support.v7.preference.PreferenceScreen
+        </PreferenceScreen>
+        <PreferenceScreen
                 android:key="installHistory"
                 android:visible="false"
                 android:title="@string/install_history"
@@ -33,10 +28,10 @@
                     android:action="android.intent.action.MAIN"
                     android:targetPackage="@string/applicationId"
                     android:targetClass="org.fdroid.fdroid.views.InstallHistoryActivity"/>
-        </android.support.v7.preference.PreferenceScreen>
-    </android.support.v7.preference.PreferenceCategory>
+        </PreferenceScreen>
+    </PreferenceCategory>
 
-    <android.support.v7.preference.PreferenceCategory android:title="@string/updates">
+    <PreferenceCategory android:title="@string/updates">
         <org.fdroid.fdroid.views.LiveSeekBarPreference
                 android:key="overWifi"
                 android:title="@string/over_wifi"
@@ -47,7 +42,7 @@
                 android:title="@string/over_data"
                 android:defaultValue="@integer/defaultOverData"
                 android:layout="@layout/preference_seekbar"/>
-        <SwitchPreference
+        <SwitchPreferenceCompat
                 android:title="@string/update_auto_download"
                 android:summary="@string/update_auto_download_summary"
                 android:key="updateAutoDownload"/>
@@ -56,13 +51,13 @@
                 android:title="@string/update_interval"
                 android:defaultValue="@integer/defaultUpdateInterval"
                 android:layout="@layout/preference_seekbar"/>
-        <SwitchPreference
+        <SwitchPreferenceCompat
                 android:title="@string/notify"
                 android:defaultValue="true"
                 android:key="updateNotify"/>
-    </android.support.v7.preference.PreferenceCategory>
+    </PreferenceCategory>
 
-    <android.support.v7.preference.PreferenceCategory android:title="@string/display"
+    <PreferenceCategory android:title="@string/display"
                                                       android:key="pref_category_display">
         <ListPreference
                 android:title="@string/pref_language"
@@ -73,30 +68,30 @@
                 android:defaultValue="light"
                 android:entries="@array/themeNames"
                 android:entryValues="@array/themeValues"/>
-    </android.support.v7.preference.PreferenceCategory>
+    </PreferenceCategory>
 
-    <android.support.v7.preference.PreferenceCategory android:title="@string/appcompatibility"
+    <PreferenceCategory android:title="@string/appcompatibility"
                                                       android:key="pref_category_appcompatibility">
-        <SwitchPreference
+        <SwitchPreferenceCompat
                 android:title="@string/show_incompat_versions"
                 android:defaultValue="false"
                 android:key="incompatibleVersions"/>
-        <SwitchPreference
+        <SwitchPreferenceCompat
                 android:title="@string/show_anti_feature_apps"
                 android:defaultValue="false"
                 android:key="showAntiFeatureApps"/>
-        <SwitchPreference
+        <SwitchPreferenceCompat
                 android:title="@string/force_touch_apps"
                 android:defaultValue="false"
                 android:key="ignoreTouchscreen"/>
-    </android.support.v7.preference.PreferenceCategory>
+    </PreferenceCategory>
 
-    <android.support.v7.preference.PreferenceCategory android:title="@string/proxy">
-        <SwitchPreference
+    <PreferenceCategory android:title="@string/proxy">
+        <SwitchPreferenceCompat
                 android:key="useTor"
                 android:summary="@string/useTorSummary"
                 android:title="@string/useTor"/>
-        <SwitchPreference
+        <SwitchPreferenceCompat
                 android:defaultValue="false"
                 android:key="enableProxy"
                 android:title="@string/enable_proxy_title"
@@ -111,24 +106,24 @@
                 android:title="@string/proxy_port"
                 android:summary="@string/proxy_port_summary"
                 android:dependency="enableProxy"/>
-    </android.support.v7.preference.PreferenceCategory>
+    </PreferenceCategory>
 
-    <android.support.v7.preference.PreferenceCategory
+    <PreferenceCategory
             android:key="pref_category_privacy"
             android:title="@string/privacy">
-        <SwitchPreference
+        <SwitchPreferenceCompat
                 android:key="promptToSendCrashReports"
                 android:title="@string/prompt_to_send_crash_reports"
                 android:summary="@string/prompt_to_send_crash_reports_summary"
                 android:defaultValue="true"/>
-        <SwitchPreference
+        <SwitchPreferenceCompat
                 android:defaultValue="false"
                 android:key="preventScreenshots"
                 android:summary="@string/preventScreenshots_summary"
                 android:title="@string/preventScreenshots_title"/>
-    </android.support.v7.preference.PreferenceCategory>
+    </PreferenceCategory>
 
-    <android.support.v7.preference.PreferenceCategory
+    <PreferenceCategory
             android:title="@string/other"
             android:key="pref_category_other">
         <ListPreference
@@ -137,7 +132,7 @@
                 android:defaultValue="86400000"
                 android:entries="@array/keepCacheNames"
                 android:entryValues="@array/keepCacheValues"/>
-        <SwitchPreference
+        <SwitchPreferenceCompat
                 android:title="@string/expert"
                 android:defaultValue="false"
                 android:key="expert"/>
@@ -153,6 +148,12 @@
                 android:summary="@string/keep_install_history_summary"
                 android:defaultValue="false"
                 android:dependency="expert"/>
+        <CheckBoxPreference
+                android:key="sendToFdroidMetrics"
+                android:title="@string/send_to_fdroid_metrics"
+                android:summary="@string/send_to_fdroid_metrics_summary"
+                android:defaultValue="false"
+                android:dependency="expert"/>
         <CheckBoxPreference
                 android:key="hideAllNotifications"
                 android:title="@string/hide_all_notifications"
@@ -177,6 +178,6 @@
                 android:key="privilegedInstaller"
                 android:persistent="false"
                 android:dependency="expert"/>
-    </android.support.v7.preference.PreferenceCategory>
+    </PreferenceCategory>
 
-</android.support.v7.preference.PreferenceScreen>
+</PreferenceScreen>

app/src/debug/AndroidManifest.xml

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
+
 <!-- This file should be outside of release manifest (in this case app/src/mock/Manifest.xml -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <!--required to enable/disable system animations from the app itself during Espresso test runs-->
-    <uses-permission android:name="android.permission.SET_ANIMATION_SCALE"/>
+    <uses-permission android:name="android.permission.SET_ANIMATION_SCALE" />
 </manifest>

app/src/full/AndroidManifest.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
+
 <!--
  * Copyright (C) 2010-2012 Ciaran Gultnieks
  * Copyright (C) 2013-2017 Peter Serwylo
@@ -23,131 +24,155 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="org.fdroid.fdroid"
-          android:installLocation="auto">
+    package="org.fdroid.fdroid"
+    android:installLocation="auto">
 
-    <uses-feature android:name="android.hardware.nfc" android:required="false"/>
-    <uses-feature android:name="android.hardware.bluetooth" android:required="false"/>
-    <uses-feature android:name="android.hardware.usb.host" android:required="false"/>
+    <uses-feature
+        android:name="android.hardware.nfc"
+        android:required="false" />
+    <uses-feature
+        android:name="android.hardware.bluetooth"
+        android:required="false" />
 
-    <uses-permission android:name="android.permission.INTERNET"/>
-    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
-    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
-    <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE"/>
-    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
-    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
-    <uses-permission android:name="android.permission.BLUETOOTH"/>
-    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
-    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
-    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
-    <uses-permission android:name="android.permission.WRITE_SETTINGS"/>
-    <uses-permission android:name="android.permission.NFC"/>
-    <uses-permission android:name="android.permission.USB_PERMISSION"
-                     android:maxSdkVersion="22"/> <!-- maybe unnecessary -->
-    <uses-permission android:name="android.permission.WAKE_LOCK"/>
+    <uses-feature
+        android:name="android.hardware.usb.host"
+        android:required="false" />
 
-    <uses-permission-sdk-23 android:name="android.permission.ACCESS_COARSE_LOCATION"/>
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_SETTINGS" />
+    <uses-permission android:name="android.permission.NFC" />
+    <uses-permission
+        android:name="android.permission.USB_PERMISSION"
+        android:maxSdkVersion="22" /><!-- maybe unnecessary -->
+
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+
+    <uses-permission-sdk-23 android:name="android.permission.ACCESS_COARSE_LOCATION" />
 
     <application>
 
         <activity
-                android:label="@string/swap"
-                android:name=".nearby.SwapWorkflowActivity"
-                android:parentActivityName=".views.main.MainActivity"
-                android:launchMode="singleTask"
-                android:theme="@style/SwapTheme.Wizard"
-                android:screenOrientation="portrait"
-                android:configChanges="orientation|keyboardHidden">
+            android:name=".nearby.SwapWorkflowActivity"
+            android:configChanges="orientation|keyboardHidden"
+            android:label="@string/swap"
+            android:launchMode="singleTask"
+            android:parentActivityName=".views.main.MainActivity"
+            android:screenOrientation="portrait">
             <meta-data
-                    android:name="android.support.PARENT_ACTIVITY"
-                    android:value=".views.main.MainActivity"/>
-        </activity>
-
-        <receiver android:name=".nearby.WifiStateChangeReceiver">
-            <intent-filter>
-                <action android:name="android.net.wifi.STATE_CHANGE"/>
-            </intent-filter>
-        </receiver>
-
-        <receiver android:name=".receiver.DeviceStorageReceiver">
-            <intent-filter>
-                <action android:name="android.intent.action.DEVICE_STORAGE_LOW"/>
-            </intent-filter>
-        </receiver>
-
-        <service
-                android:name=".nearby.WifiStateChangeService"
-                android:exported="false"/>
-        <service android:name=".nearby.SwapService"/>
-
-        <service
-                android:name=".nearby.LocalRepoService"
-                android:exported="false"/>
-        <service
-                android:name=".nearby.TreeUriScannerIntentService"
-                android:exported="false"/>
-        <service
-                android:name=".nearby.SDCardScannerService"
-                android:exported="false"/>
-
-        <activity
-                android:name=".nearby.UsbDeviceAttachedActivity"
-                android:noHistory="true">
-            <intent-filter>
-                <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"/>
-            </intent-filter>
-            <meta-data
-                    android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
-                    android:resource="@xml/device_filter"/>
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value=".views.main.MainActivity" />
         </activity>
 
         <activity
-                android:name=".panic.PanicPreferencesActivity"
-                android:label="@string/panic_settings"
-                android:parentActivityName=".views.main.MainActivity">
-            <meta-data
-                    android:name="android.support.PARENT_ACTIVITY"
-                    android:value=".views.main.MainActivity"/>
-
+            android:name=".panic.PanicPreferencesActivity"
+            android:label="@string/panic_settings"
+            android:parentActivityName=".views.main.MainActivity">
             <intent-filter>
-                <action android:name="info.guardianproject.panic.action.CONNECT"/>
-                <action android:name="info.guardianproject.panic.action.DISCONNECT"/>
+                <action android:name="info.guardianproject.panic.action.CONNECT" />
+                <action android:name="info.guardianproject.panic.action.DISCONNECT" />
 
-                <category android:name="android.intent.category.DEFAULT"/>
+                <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
+
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value=".views.main.MainActivity" />
         </activity>
-        <activity
-                android:name=".panic.SelectInstalledAppsActivity"
-                android:parentActivityName=".panic.PanicPreferencesActivity"/>
 
         <activity
-                android:name=".panic.PanicResponderActivity"
-                android:noHistory="true"
-                android:theme="@android:style/Theme.NoDisplay">
+            android:name=".panic.SelectInstalledAppsActivity"
+            android:parentActivityName=".panic.PanicPreferencesActivity" />
+
+        <activity
+            android:name=".panic.PanicResponderActivity"
+            android:noHistory="true"
+            android:theme="@android:style/Theme.NoDisplay">
 
             <!-- this can never have launchMode singleTask or singleInstance! -->
             <intent-filter>
-                <action android:name="info.guardianproject.panic.action.TRIGGER"/>
+                <action android:name="info.guardianproject.panic.action.TRIGGER" />
 
-                <category android:name="android.intent.category.DEFAULT"/>
+                <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
         </activity>
         <activity
-                android:name=".panic.ExitActivity"
-                android:theme="@android:style/Theme.NoDisplay"/>
+            android:name=".panic.ExitActivity"
+            android:theme="@android:style/Theme.NoDisplay" />
+
         <activity
-                android:name=".panic.CalculatorActivity"
-                android:enabled="false"
-                android:icon="@mipmap/ic_calculator_launcher"
-                android:label="@string/hiding_calculator"
-                android:theme="@style/AppThemeLight">
+            android:name=".panic.CalculatorActivity"
+            android:enabled="false"
+            android:icon="@mipmap/ic_calculator_launcher"
+            android:label="@string/hiding_calculator">
             <intent-filter>
-                <action android:name="android.intent.action.MAIN"/>
+                <action android:name="android.intent.action.MAIN" />
 
-                <category android:name="android.intent.category.LAUNCHER"/>
+                <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <receiver android:name=".nearby.WifiStateChangeReceiver">
+            <intent-filter>
+                <action android:name="android.net.wifi.STATE_CHANGE" />
+            </intent-filter>
+        </receiver>
+        <receiver android:name=".receiver.DeviceStorageReceiver">
+            <intent-filter>
+                <action android:name="android.intent.action.DEVICE_STORAGE_LOW" />
+            </intent-filter>
+        </receiver>
+
+        <receiver android:name=".nearby.UsbDeviceAttachedReceiver">
+            <intent-filter>
+                <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
+            </intent-filter>
+            <meta-data
+                android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
+                android:resource="@xml/device_filter" />
+        </receiver>
+        <receiver android:name=".nearby.UsbDeviceDetachedReceiver">
+            <intent-filter>
+                <action android:name="android.hardware.usb.action.USB_DEVICE_DETACHED" />
+            </intent-filter>
+            <meta-data
+                android:name="android.hardware.usb.action.USB_DEVICE_DETACHED"
+                android:resource="@xml/device_filter" />
+        </receiver>
+        <receiver android:name=".nearby.UsbDeviceMediaMountedReceiver">
+            <intent-filter>
+                <action android:name="android.intent.action.MEDIA_EJECT" />
+                <action android:name="android.intent.action.MEDIA_REMOVED" />
+                <action android:name="android.intent.action.MEDIA_MOUNTED" />
+                <action android:name="android.intent.action.MEDIA_BAD_REMOVAL" />
+
+                <data android:scheme="content" />
+                <data android:scheme="file" />
+            </intent-filter>
+        </receiver>
+
+        <service
+            android:name=".nearby.WifiStateChangeService"
+            android:exported="false" />
+        <service android:name=".nearby.SwapService" />
+
+        <service
+            android:name=".nearby.LocalRepoService"
+            android:exported="false" />
+        <service
+            android:name=".nearby.TreeUriScannerIntentService"
+            android:exported="false" />
+        <service
+            android:name=".nearby.SDCardScannerService"
+            android:exported="false" />
 
     </application>
 

app/src/full/java/javax/jmdns/impl/FDroidServiceInfo.java

@@ -4,12 +4,13 @@ import android.os.Parcel;
 import android.os.Parcelable;
 import android.text.TextUtils;
 
-import javax.jmdns.ServiceInfo;
-import javax.jmdns.impl.util.ByteWrangler;
 import java.net.Inet4Address;
 import java.net.Inet6Address;
 import java.net.UnknownHostException;
 
+import javax.jmdns.ServiceInfo;
+import javax.jmdns.impl.util.ByteWrangler;
+
 /**
  * The ServiceInfo class needs to be serialized in order to be sent as an Android broadcast.
  * In order to make it Parcelable (or Serializable for that matter), there are some package-scope

app/src/full/java/org/fdroid/fdroid/nearby/BluetoothManager.java

@@ -10,15 +10,17 @@ import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Message;
 import android.os.Process;
-import android.support.v4.content.LocalBroadcastManager;
 import android.text.TextUtils;
 import android.util.Log;
+
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.Utils;
 import org.fdroid.fdroid.nearby.peers.BluetoothPeer;
 
 import java.lang.ref.WeakReference;
 
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
+
 /**
  * Manage the {@link android.bluetooth.BluetoothAdapter}in a {@link HandlerThread}.
  * The start process is in {@link HandlerThread#onLooperPrepared()} so that it is

app/src/full/java/org/fdroid/fdroid/nearby/BluetoothServer.java

@@ -5,7 +5,7 @@ import android.bluetooth.BluetoothServerSocket;
 import android.bluetooth.BluetoothSocket;
 import android.util.Log;
 import android.webkit.MimeTypeMap;
-import fi.iki.elonen.NanoHTTPD;
+
 import org.fdroid.fdroid.Utils;
 import org.fdroid.fdroid.nearby.httpish.Request;
 import org.fdroid.fdroid.nearby.httpish.Response;
@@ -20,6 +20,8 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import fi.iki.elonen.NanoHTTPD;
+
 /**
  * Act as a layer on top of LocalHTTPD server, by forwarding requests served
  * over bluetooth to that server.

app/src/full/java/org/fdroid/fdroid/nearby/BonjourManager.java

@@ -7,23 +7,27 @@ import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Message;
 import android.os.Process;
-import android.support.v4.content.LocalBroadcastManager;
 import android.text.TextUtils;
 import android.util.Log;
+
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.Utils;
 import org.fdroid.fdroid.nearby.peers.BonjourPeer;
 
-import javax.jmdns.JmDNS;
-import javax.jmdns.ServiceEvent;
-import javax.jmdns.ServiceInfo;
-import javax.jmdns.ServiceListener;
 import java.io.IOException;
 import java.lang.ref.WeakReference;
 import java.net.InetAddress;
 import java.util.HashMap;
 
+import javax.jmdns.JmDNS;
+import javax.jmdns.ServiceEvent;
+import javax.jmdns.ServiceInfo;
+import javax.jmdns.ServiceListener;
+
+import androidx.core.content.ContextCompat;
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
+
 /**
  * Manage {@link JmDNS} in a {@link HandlerThread}.  The start process is in
  * {@link HandlerThread#onLooperPrepared()} so that it is always started before
@@ -119,8 +123,7 @@ public class BonjourManager {
         }
         sendBroadcast(STATUS_STARTING, null);
 
-        final WifiManager wifiManager = (WifiManager) context.getApplicationContext()
-                .getSystemService(Context.WIFI_SERVICE);
+        final WifiManager wifiManager = ContextCompat.getSystemService(context, WifiManager.class);
         handlerThread = new HandlerThread("BonjourManager", Process.THREAD_PRIORITY_LESS_FAVORABLE) {
             @Override
             protected void onLooperPrepared() {

app/src/full/java/org/fdroid/fdroid/nearby/LocalHTTPD.java

@@ -35,11 +35,9 @@ package org.fdroid.fdroid.nearby;
 
 import android.content.Context;
 import android.net.Uri;
-import fi.iki.elonen.NanoHTTPD;
-import fi.iki.elonen.NanoHTTPD.Response.IStatus;
+
 import org.fdroid.fdroid.BuildConfig;
 
-import javax.net.ssl.SSLServerSocketFactory;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
@@ -62,6 +60,11 @@ import java.util.Map;
 import java.util.StringTokenizer;
 import java.util.TimeZone;
 
+import javax.net.ssl.SSLServerSocketFactory;
+
+import fi.iki.elonen.NanoHTTPD;
+import fi.iki.elonen.NanoHTTPD.Response.IStatus;
+
 /**
  * A HTTP server for serving the files that are being swapped via WiFi, etc.
  * The only changes were to remove unneeded extras like {@code main()}, the

app/src/full/java/org/fdroid/fdroid/nearby/LocalHTTPDManager.java

@@ -6,8 +6,8 @@ import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Message;
 import android.os.Process;
-import android.support.v4.content.LocalBroadcastManager;
 import android.util.Log;
+
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.Preferences;
 
@@ -15,6 +15,8 @@ import java.io.IOException;
 import java.net.BindException;
 import java.util.Random;
 
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
+
 /**
  * Manage {@link LocalHTTPD} in a {@link HandlerThread};
  */

app/src/full/java/org/fdroid/fdroid/nearby/LocalRepoKeyStore.java

@@ -2,7 +2,7 @@ package org.fdroid.fdroid.nearby;
 
 import android.content.Context;
 import android.util.Log;
-import kellinwood.security.zipsigner.ZipSigner;
+
 import org.bouncycastle.asn1.ASN1Sequence;
 import org.bouncycastle.asn1.x500.X500Name;
 import org.bouncycastle.asn1.x509.GeneralName;
@@ -19,9 +19,6 @@ import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.Utils;
 
-import javax.net.ssl.KeyManager;
-import javax.net.ssl.KeyManagerFactory;
-import javax.net.ssl.X509KeyManager;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
@@ -49,6 +46,12 @@ import java.util.Date;
 import java.util.GregorianCalendar;
 import java.util.Locale;
 
+import javax.net.ssl.KeyManager;
+import javax.net.ssl.KeyManagerFactory;
+import javax.net.ssl.X509KeyManager;
+
+import kellinwood.security.zipsigner.ZipSigner;
+
 // TODO Address exception handling in a uniform way throughout
 
 @SuppressWarnings("LineLength")

app/src/full/java/org/fdroid/fdroid/nearby/LocalRepoManager.java

@@ -10,10 +10,9 @@ import android.graphics.Bitmap.Config;
 import android.graphics.Canvas;
 import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
 import android.text.TextUtils;
 import android.util.Log;
+
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.Hasher;
 import org.fdroid.fdroid.IndexUpdater;
@@ -50,13 +49,15 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.jar.JarEntry;
 import java.util.jar.JarOutputStream;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
 /**
  * The {@link SwapService} deals with managing the entire workflow from selecting apps to
  * swap, to invoking this class to prepare the webroot, to enabling various communication protocols.
  * This class deals specifically with the webroot side of things, ensuring we have a valid index.jar
  * and the relevant .apk and icon files available.
  */
-@SuppressWarnings("LineLength")
 public final class LocalRepoManager {
     private static final String TAG = "LocalRepoManager";
 
@@ -65,7 +66,7 @@ public final class LocalRepoManager {
     private final AssetManager assetManager;
     private final String fdroidPackageName;
 
-    private static final String[] WEB_ROOT_ASSET_FILES = {
+    public static final String[] WEB_ROOT_ASSET_FILES = {
             "swap-icon.png",
             "swap-tick-done.png",
             "swap-tick-not-done.png",
@@ -124,7 +125,7 @@ public final class LocalRepoManager {
 
     private String writeFdroidApkToWebroot() {
         ApplicationInfo appInfo;
-        String fdroidClientURL = "https://f-droid.org/FDroid.apk";
+        String fdroidClientURL = "https://f-droid.org/F-Droid.apk";
 
         try {
             appInfo = pm.getApplicationInfo(fdroidPackageName, PackageManager.GET_META_DATA);
@@ -348,7 +349,8 @@ public final class LocalRepoManager {
             serializer = XmlPullParserFactory.newInstance().newSerializer();
         }
 
-        public void build(Context context, Map<String, App> apps, OutputStream output) throws IOException, LocalRepoKeyStore.InitException {
+        public void build(Context context, Map<String, App> apps, OutputStream output)
+                throws IOException, LocalRepoKeyStore.InitException {
             serializer.setOutput(output, "UTF-8");
             serializer.startDocument(null, null);
             serializer.startTag("", "fdroid");
@@ -356,12 +358,14 @@ public final class LocalRepoManager {
             // <repo> block
             serializer.startTag("", "repo");
             serializer.attribute("", "icon", "blah.png");
-            serializer.attribute("", "name", Preferences.get().getLocalRepoName() + " on " + FDroidApp.ipAddressString);
+            serializer.attribute("", "name", Preferences.get().getLocalRepoName()
+                    + " on " + FDroidApp.ipAddressString);
             serializer.attribute("", "pubkey", Hasher.hex(LocalRepoKeyStore.get(context).getCertificate()));
             long timestamp = System.currentTimeMillis() / 1000L;
             serializer.attribute("", "timestamp", String.valueOf(timestamp));
             serializer.attribute("", "version", "10");
-            tag("description", "A local FDroid repo generated from apps installed on " + Preferences.get().getLocalRepoName());
+            tag("description", "A local FDroid repo generated from apps installed on "
+                    + Preferences.get().getLocalRepoName());
             serializer.endTag("", "repo");
 
             // <application> blocks
@@ -414,7 +418,7 @@ public final class LocalRepoManager {
             tag("lastupdated", app.lastUpdated);
             tag("name", app.name);
             tag("summary", app.summary);
-            tag("icon", app.icon);
+            tag("icon", app.iconFromApk);
             tag("desc", app.description);
             tag("license", "Unknown");
             tag("categories", "LocalRepo," + Preferences.get().getLocalRepoName());

app/src/full/java/org/fdroid/fdroid/nearby/LocalRepoService.java

@@ -4,7 +4,7 @@ import android.app.IntentService;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Process;
-import android.support.v4.content.LocalBroadcastManager;
+
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.Utils;
@@ -15,6 +15,8 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.Set;
 
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
+
 /**
  * Handles setting up and generating the local repo used to swap apps, including
  * the {@code index.jar}, the symlinks to the shared APKs, etc.

app/src/full/java/org/fdroid/fdroid/nearby/SDCardScannerService.java

@@ -28,11 +28,10 @@ import android.net.Uri;
 import android.os.Build;
 import android.os.Environment;
 import android.os.Process;
-import android.support.v4.content.ContextCompat;
 import android.util.Log;
+
 import org.fdroid.fdroid.IndexUpdater;
 import org.fdroid.fdroid.IndexV1Updater;
-import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.Utils;
 
 import java.io.File;
@@ -45,6 +44,8 @@ import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 
+import androidx.core.content.ContextCompat;
+
 /**
  * An {@link IntentService} subclass for scanning removable "external storage"
  * for F-Droid package repos, e.g. SD Cards. This is intended to support
@@ -55,7 +56,7 @@ import java.util.List;
  * "External Storage"
  * <p>
  * Scanning the removable storage requires that the user allowed it.  This
- * requires both the {@link Preferences#isScanRemovableStorageEnabled()}
+ * requires both the {@link org.fdroid.fdroid.Preferences#isScanRemovableStorageEnabled()}
  * and the {@link android.Manifest.permission#READ_EXTERNAL_STORAGE}
  * permission to be enabled.
  *
@@ -75,11 +76,9 @@ public class SDCardScannerService extends IntentService {
     }
 
     public static void scan(Context context) {
-        if (Preferences.get().isScanRemovableStorageEnabled()) {
-            Intent intent = new Intent(context, SDCardScannerService.class);
-            intent.setAction(ACTION_SCAN);
-            context.startService(intent);
-        }
+        Intent intent = new Intent(context, SDCardScannerService.class);
+        intent.setAction(ACTION_SCAN);
+        context.startService(intent);
     }
 
     @Override

app/src/full/java/org/fdroid/fdroid/nearby/SelectAppsView.java

@@ -4,16 +4,9 @@ import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.database.Cursor;
-import android.graphics.PorterDuff;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Bundle;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
-import android.support.v4.app.LoaderManager;
-import android.support.v4.content.CursorLoader;
-import android.support.v4.content.Loader;
-import android.support.v4.widget.CursorAdapter;
 import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.view.ContextThemeWrapper;
@@ -26,10 +19,19 @@ import android.widget.CompoundButton;
 import android.widget.ImageView;
 import android.widget.ListView;
 import android.widget.TextView;
+
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.data.InstalledAppProvider;
 import org.fdroid.fdroid.data.Schema.InstalledAppTable;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.core.content.ContextCompat;
+import androidx.cursoradapter.widget.CursorAdapter;
+import androidx.loader.app.LoaderManager;
+import androidx.loader.content.CursorLoader;
+import androidx.loader.content.Loader;
+
 public class SelectAppsView extends SwapView implements LoaderManager.LoaderCallbacks<Cursor> {
 
     public SelectAppsView(Context context) {
@@ -138,14 +140,14 @@ public class SelectAppsView extends SwapView implements LoaderManager.LoaderCall
         private LayoutInflater getInflater(Context context) {
             if (inflater == null) {
                 Context themedContext = new ContextThemeWrapper(context, R.style.SwapTheme_AppList_ListItem);
-                inflater = (LayoutInflater) themedContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+                inflater = ContextCompat.getSystemService(themedContext, LayoutInflater.class);
             }
             return inflater;
         }
 
         private Drawable getDefaultAppIcon(Context context) {
             if (defaultAppIcon == null) {
-                defaultAppIcon = context.getResources().getDrawable(android.R.drawable.sym_def_app_icon);
+                defaultAppIcon = ContextCompat.getDrawable(context, android.R.drawable.sym_def_app_icon);
             }
             return defaultAppIcon;
         }
@@ -197,8 +199,6 @@ public class SelectAppsView extends SwapView implements LoaderManager.LoaderCall
                     }
                 });
             }
-
-            updateCheckedIndicatorView(view, listView.isItemChecked(listPosition));
         }
 
         public void updateCheckedIndicatorView(int position, boolean checked) {
@@ -207,26 +207,7 @@ public class SelectAppsView extends SwapView implements LoaderManager.LoaderCall
 
             if (position >= firstListItemPosition && position <= lastListItemPosition) {
                 final int childIndex = position - firstListItemPosition;
-                updateCheckedIndicatorView(listView.getChildAt(childIndex), checked);
-            }
-        }
-
-        private void updateCheckedIndicatorView(View view, boolean checked) {
-            ImageView imageView = (ImageView) view.findViewById(R.id.checked);
-            if (imageView != null) {
-                int resource;
-                int colour;
-                if (checked) {
-                    resource = R.drawable.ic_check_circle_white;
-                    colour = getResources().getColor(R.color.swap_bright_blue);
-                } else {
-                    resource = R.drawable.ic_add_circle_outline_white;
-                    colour = 0xFFD0D0D4;
-                }
-                imageView.setImageDrawable(getResources().getDrawable(resource));
-                imageView.setColorFilter(colour, PorterDuff.Mode.MULTIPLY);
             }
         }
     }
-
 }

app/src/full/java/org/fdroid/fdroid/nearby/StartSwapView.java

@@ -7,9 +7,6 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.net.wifi.WifiConfiguration;
-import android.support.annotation.Nullable;
-import android.support.v4.content.LocalBroadcastManager;
-import android.support.v7.widget.SwitchCompat;
 import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
@@ -22,7 +19,7 @@ import android.widget.ImageView;
 import android.widget.ListView;
 import android.widget.ProgressBar;
 import android.widget.TextView;
-import cc.mvdan.accesspoint.WifiApControl;
+
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.Utils;
@@ -30,6 +27,12 @@ import org.fdroid.fdroid.nearby.peers.Peer;
 
 import java.util.ArrayList;
 
+import androidx.annotation.Nullable;
+import com.google.android.material.switchmaterial.SwitchMaterial;
+import androidx.core.content.ContextCompat;
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
+import cc.mvdan.accesspoint.WifiApControl;
+
 @SuppressWarnings("LineLength")
 public class StartSwapView extends SwapView {
     private static final String TAG = "StartSwapView";
@@ -67,7 +70,7 @@ public class StartSwapView extends SwapView {
             Peer peer = getItem(position);
             ((TextView) convertView.findViewById(R.id.peer_name)).setText(peer.getName());
             ((ImageView) convertView.findViewById(R.id.icon))
-                    .setImageDrawable(getResources().getDrawable(peer.getIcon()));
+                    .setImageDrawable(ContextCompat.getDrawable(getContext(), peer.getIcon()));
 
             return convertView;
         }
@@ -76,7 +79,7 @@ public class StartSwapView extends SwapView {
     @Nullable /* Emulators typically don't have bluetooth adapters */
     private final BluetoothAdapter bluetooth = BluetoothAdapter.getDefaultAdapter();
 
-    private SwitchCompat bluetoothSwitch;
+    private SwitchMaterial bluetoothSwitch;
     private TextView viewBluetoothId;
     private TextView textBluetoothVisible;
     private TextView viewWifiId;
@@ -172,7 +175,7 @@ public class StartSwapView extends SwapView {
 
             textBluetoothVisible = findViewById(R.id.bluetooth_visible);
 
-            bluetoothSwitch = (SwitchCompat) findViewById(R.id.switch_bluetooth);
+            bluetoothSwitch = (SwitchMaterial) findViewById(R.id.switch_bluetooth);
             bluetoothSwitch.setOnCheckedChangeListener(onBluetoothSwitchToggled);
             bluetoothSwitch.setChecked(SwapService.getBluetoothVisibleUserPreference());
             bluetoothSwitch.setEnabled(true);
@@ -223,7 +226,13 @@ public class StartSwapView extends SwapView {
             if (textWifiVisible != null) {
                 textWifiVisible.setText(R.string.swap_visible_hotspot);
             }
-            viewWifiNetwork.setText(getContext().getString(R.string.swap_active_hotspot, config.SSID));
+            Context context = getContext();
+            if (config == null) {
+                viewWifiNetwork.setText(context.getString(R.string.swap_active_hotspot,
+                        context.getString(R.string.swap_blank_wifi_ssid)));
+            } else {
+                viewWifiNetwork.setText(context.getString(R.string.swap_active_hotspot, config.SSID));
+            }
         } else if (TextUtils.isEmpty(FDroidApp.ssid)) {
             // not connected to or setup with any wifi network
             viewWifiNetwork.setText(R.string.swap_no_wifi_network);

app/src/full/java/org/fdroid/fdroid/nearby/SwapService.java

@@ -1,6 +1,5 @@
 package org.fdroid.fdroid.nearby;
 
-import android.annotation.SuppressLint;
 import android.app.Notification;
 import android.app.PendingIntent;
 import android.app.Service;
@@ -13,17 +12,19 @@ import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.net.Uri;
 import android.net.wifi.WifiManager;
-import android.os.AsyncTask;
-import android.os.Build;
 import android.os.IBinder;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
-import android.support.v4.app.NotificationCompat;
-import android.support.v4.content.LocalBroadcastManager;
 import android.text.TextUtils;
 import android.util.Log;
-import cc.mvdan.accesspoint.WifiApControl;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.core.app.NotificationCompat;
+import androidx.core.app.ServiceCompat;
+import androidx.core.content.ContextCompat;
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
+
 import org.fdroid.fdroid.FDroidApp;
+import org.fdroid.fdroid.NotificationHelper;
 import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.UpdateService;
@@ -34,7 +35,6 @@ import org.fdroid.fdroid.data.Schema;
 import org.fdroid.fdroid.nearby.peers.Peer;
 import org.fdroid.fdroid.net.Downloader;
 
-import java.io.IOException;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.net.HttpURLConnection;
@@ -45,6 +45,12 @@ import java.util.Set;
 import java.util.Timer;
 import java.util.TimerTask;
 
+import cc.mvdan.accesspoint.WifiApControl;
+import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers;
+import io.reactivex.rxjava3.core.Completable;
+import io.reactivex.rxjava3.disposables.CompositeDisposable;
+import io.reactivex.rxjava3.schedulers.Schedulers;
+
 /**
  * Central service which manages all of the different moving parts of swap which are required
  * to enable p2p swapping of apps.
@@ -72,15 +78,6 @@ public class SwapService extends Service {
     private static WifiManager wifiManager;
     private static Timer pollConnectedSwapRepoTimer;
 
-    public static void start(Context context) {
-        Intent intent = new Intent(context, SwapService.class);
-        if (Build.VERSION.SDK_INT < 26) {
-            context.startService(intent);
-        } else {
-            context.startForegroundService(intent);
-        }
-    }
-
     public static void stop(Context context) {
         Intent intent = new Intent(context, SwapService.class);
         context.stopService(intent);
@@ -114,46 +111,6 @@ public class SwapService extends Service {
         UpdateService.updateRepoNow(this, peer.getRepoAddress());
     }
 
-    @SuppressLint("StaticFieldLeak")
-    private void askServerToSwapWithUs(final Repo repo) {
-        new AsyncTask<Void, Void, Void>() {
-            @Override
-            protected Void doInBackground(Void... args) {
-                String swapBackUri = Utils.getLocalRepoUri(FDroidApp.repo).toString();
-                HttpURLConnection conn = null;
-                try {
-                    URL url = new URL(repo.address.replace("/fdroid/repo", "/request-swap"));
-                    conn = (HttpURLConnection) url.openConnection();
-                    conn.setRequestMethod("POST");
-                    conn.setDoInput(true);
-                    conn.setDoOutput(true);
-
-                    OutputStream outputStream = conn.getOutputStream();
-                    OutputStreamWriter writer = new OutputStreamWriter(outputStream);
-                    writer.write("repo=" + swapBackUri);
-                    writer.flush();
-                    writer.close();
-                    outputStream.close();
-
-                    int responseCode = conn.getResponseCode();
-                    Utils.debugLog(TAG, "Asking server at " + repo.address + " to swap with us in return (by " +
-                            "POSTing to \"/request-swap\" with repo \"" + swapBackUri + "\"): " + responseCode);
-                } catch (IOException e) {
-                    Log.e(TAG, "Error while asking server to swap with us", e);
-                    Intent intent = new Intent(Downloader.ACTION_INTERRUPTED);
-                    intent.setData(Uri.parse(repo.address));
-                    intent.putExtra(Downloader.EXTRA_ERROR_MESSAGE, e.getLocalizedMessage());
-                    LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent);
-                } finally {
-                    if (conn != null) {
-                        conn.disconnect();
-                    }
-                }
-                return null;
-            }
-        }.execute();
-    }
-
     private Repo ensureRepoExists(@NonNull Peer peer) {
         // TODO: newRepoConfig.getParsedUri() will include a fingerprint, which may not match with
         // the repos address in the database. Not sure on best behaviour in this situation.
@@ -347,12 +304,15 @@ public class SwapService extends Service {
     @Nullable
     private Timer timer;
 
+    private final CompositeDisposable compositeDisposable = new CompositeDisposable();
+
     public class Binder extends android.os.Binder {
         public SwapService getService() {
             return SwapService.this;
         }
     }
 
+    @Override
     public void onCreate() {
         super.onCreate();
         startForeground(NOTIFICATION, createNotification());
@@ -371,7 +331,7 @@ public class SwapService extends Service {
                     new IntentFilter(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED));
         }
 
-        wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
+        wifiManager = ContextCompat.getSystemService(getApplicationContext(), WifiManager.class);
         if (wifiManager != null) {
             SwapService.putWifiEnabledBeforeSwap(wifiManager.isWifiEnabled());
         }
@@ -402,6 +362,45 @@ public class SwapService extends Service {
         BonjourManager.setVisible(this, getWifiVisibleUserPreference() || getHotspotActivatedUserPreference());
     }
 
+    private void askServerToSwapWithUs(final Repo repo) {
+        compositeDisposable.add(
+                Completable.fromAction(() -> {
+                    String swapBackUri = Utils.getLocalRepoUri(FDroidApp.repo).toString();
+                    HttpURLConnection conn = null;
+                    try {
+                        URL url = new URL(repo.address.replace("/fdroid/repo", "/request-swap"));
+                        conn = (HttpURLConnection) url.openConnection();
+                        conn.setRequestMethod("POST");
+                        conn.setDoInput(true);
+                        conn.setDoOutput(true);
+
+                        try (OutputStream outputStream = conn.getOutputStream();
+                             OutputStreamWriter writer = new OutputStreamWriter(outputStream)) {
+                            writer.write("repo=" + swapBackUri);
+                            writer.flush();
+                        }
+
+                        int responseCode = conn.getResponseCode();
+                        Utils.debugLog(TAG, "Asking server at " + repo.address + " to swap with us in return (by " +
+                                "POSTing to \"/request-swap\" with repo \"" + swapBackUri + "\"): " + responseCode);
+                    } finally {
+                        if (conn != null) {
+                            conn.disconnect();
+                        }
+                    }
+                })
+                        .subscribeOn(Schedulers.io())
+                        .observeOn(AndroidSchedulers.mainThread())
+                        .doOnError(e -> {
+                            Intent intent = new Intent(Downloader.ACTION_INTERRUPTED);
+                            intent.setData(Uri.parse(repo.address));
+                            intent.putExtra(Downloader.EXTRA_ERROR_MESSAGE, e.getLocalizedMessage());
+                            LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent);
+                        })
+                        .subscribe()
+        );
+    }
+
     /**
      * This is for setting things up for when the {@code SwapService} was
      * started by the user clicking on the initial start button. The things
@@ -425,6 +424,8 @@ public class SwapService extends Service {
 
     @Override
     public void onDestroy() {
+        compositeDisposable.dispose();
+
         Utils.debugLog(TAG, "Destroying service, will disable swapping if required, and unregister listeners.");
         Preferences.get().unregisterLocalRepoHttpsListeners(httpsEnabledListener);
         localBroadcastManager.unregisterReceiver(onWifiChange);
@@ -433,7 +434,9 @@ public class SwapService extends Service {
         localBroadcastManager.unregisterReceiver(bonjourPeerFound);
         localBroadcastManager.unregisterReceiver(bonjourPeerRemoved);
 
-        unregisterReceiver(bluetoothScanModeChanged);
+        if (bluetoothAdapter != null) {
+            unregisterReceiver(bluetoothScanModeChanged);
+        }
 
         BluetoothManager.stop(this);
 
@@ -457,7 +460,7 @@ public class SwapService extends Service {
         if (timer != null) {
             timer.cancel();
         }
-        stopForeground(true);
+        ServiceCompat.stopForeground(this, ServiceCompat.STOP_FOREGROUND_REMOVE);
 
         deleteAllSwapRepos();
 
@@ -468,7 +471,7 @@ public class SwapService extends Service {
         Intent intent = new Intent(this, SwapWorkflowActivity.class);
         intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
         PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
-        return new NotificationCompat.Builder(this)
+        return new NotificationCompat.Builder(this, NotificationHelper.CHANNEL_SWAPS)
                 .setContentTitle(getText(R.string.local_repo_running))
                 .setContentText(getText(R.string.touch_to_configure_local_repo))
                 .setSmallIcon(R.drawable.ic_nearby)

app/src/full/java/org/fdroid/fdroid/nearby/SwapSuccessView.java

@@ -1,7 +1,6 @@
 package org.fdroid.fdroid.nearby;
 
 import android.annotation.TargetApi;
-import android.app.Activity;
 import android.app.PendingIntent;
 import android.content.BroadcastReceiver;
 import android.content.Context;
@@ -12,13 +11,6 @@ import android.database.Cursor;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
-import android.support.v4.app.LoaderManager;
-import android.support.v4.content.CursorLoader;
-import android.support.v4.content.Loader;
-import android.support.v4.content.LocalBroadcastManager;
-import android.support.v4.widget.CursorAdapter;
 import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.util.Log;
@@ -31,7 +23,9 @@ import android.widget.ListView;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 import android.widget.Toast;
+
 import com.nostra13.universalimageloader.core.ImageLoader;
+
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.UpdateService;
 import org.fdroid.fdroid.Utils;
@@ -48,6 +42,16 @@ import org.fdroid.fdroid.net.DownloaderService;
 
 import java.util.List;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
+import androidx.cursoradapter.widget.CursorAdapter;
+import androidx.loader.app.LoaderManager;
+import androidx.loader.content.CursorLoader;
+import androidx.loader.content.Loader;
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
+
 /**
  * This is a view that shows a listing of all apps in the swap repo that this
  * just connected to.  The app listing and search should be replaced by
@@ -194,7 +198,7 @@ public class SwapSuccessView extends SwapView implements LoaderManager.LoaderCal
             private final ContentObserver appObserver = new ContentObserver(new Handler()) {
                 @Override
                 public void onChange(boolean selfChange) {
-                    Activity activity = getActivity();
+                    AppCompatActivity activity = getActivity();
                     if (activity != null && app != null) {
                         app = AppProvider.Helper.findSpecificApp(
                                 activity.getContentResolver(),
@@ -309,7 +313,7 @@ public class SwapSuccessView extends SwapView implements LoaderManager.LoaderCal
                     nameView.setText(app.name);
                 }
 
-                ImageLoader.getInstance().displayImage(app.iconUrl, iconView, Utils.getRepoAppDisplayImageOptions());
+                ImageLoader.getInstance().displayImage(app.getIconUrl(iconView.getContext()), iconView, Utils.getRepoAppDisplayImageOptions());
 
                 if (app.hasUpdates()) {
                     btnInstall.setText(R.string.menu_upgrade);
@@ -361,7 +365,7 @@ public class SwapSuccessView extends SwapView implements LoaderManager.LoaderCal
         @NonNull
         private LayoutInflater getInflater(Context context) {
             if (inflater == null) {
-                inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+                inflater = ContextCompat.getSystemService(context, LayoutInflater.class);
             }
             return inflater;
         }

app/src/full/java/org/fdroid/fdroid/nearby/SwapView.java

@@ -3,12 +3,15 @@ package org.fdroid.fdroid.nearby;
 import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.res.TypedArray;
-import android.support.annotation.ColorInt;
-import android.support.annotation.LayoutRes;
 import android.util.AttributeSet;
 import android.widget.RelativeLayout;
+
 import org.fdroid.fdroid.R;
 
+import androidx.annotation.ColorInt;
+import androidx.annotation.LayoutRes;
+import androidx.core.content.ContextCompat;
+
 /**
  * A {@link android.view.View} that registers to handle the swap events from
  * {@link SwapService}.
@@ -32,8 +35,19 @@ public class SwapView extends RelativeLayout {
         this(context, attrs, 0);
     }
 
+    /**
+     * In order to support Android < 21, this calls {@code super} rather than
+     * {@code this}.  {@link RelativeLayout}'s methods just use a 0 for the
+     * fourth argument, just like this used to.
+     */
     public SwapView(Context context, AttributeSet attrs, int defStyleAttr) {
-        this(context, attrs, defStyleAttr, 0);
+        super(context, attrs, defStyleAttr);
+        final TypedArray a = context.obtainStyledAttributes(
+                attrs, R.styleable.SwapView, 0, 0);
+        toolbarColor = a.getColor(R.styleable.SwapView_toolbarColor,
+                ContextCompat.getColor(context, R.color.swap_blue));
+        toolbarTitle = a.getString(R.styleable.SwapView_toolbarTitle);
+        a.recycle();
     }
 
     @TargetApi(21)
@@ -42,7 +56,7 @@ public class SwapView extends RelativeLayout {
         final TypedArray a = context.obtainStyledAttributes(
                 attrs, R.styleable.SwapView, 0, 0);
         toolbarColor = a.getColor(R.styleable.SwapView_toolbarColor,
-                getResources().getColor(R.color.swap_blue));
+                ContextCompat.getColor(context, R.color.swap_blue));
         toolbarTitle = a.getString(R.styleable.SwapView_toolbarTitle);
         a.recycle();
     }

app/src/full/java/org/fdroid/fdroid/nearby/SwapWorkflowActivity.java

@@ -1,7 +1,6 @@
 package org.fdroid.fdroid.nearby;
 
 import android.annotation.TargetApi;
-import android.app.Activity;
 import android.bluetooth.BluetoothAdapter;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
@@ -17,17 +16,6 @@ import android.os.Build;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.provider.Settings;
-import android.support.annotation.LayoutRes;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
-import android.support.annotation.StringRes;
-import android.support.v4.content.LocalBroadcastManager;
-import android.support.v4.view.MenuItemCompat;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.SearchView;
-import android.support.v7.widget.SwitchCompat;
-import android.support.v7.widget.Toolbar;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.LayoutInflater;
@@ -45,9 +33,22 @@ import android.widget.ListView;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 import android.widget.Toast;
-import cc.mvdan.accesspoint.WifiApControl;
+
+import androidx.annotation.LayoutRes;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.SearchView;
+import androidx.core.content.ContextCompat;
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
+
+import com.google.android.material.appbar.MaterialToolbar;
+import com.google.android.material.switchmaterial.SwitchMaterial;
 import com.google.zxing.integration.android.IntentIntegrator;
 import com.google.zxing.integration.android.IntentResult;
+
 import org.fdroid.fdroid.BuildConfig;
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.NfcHelper;
@@ -64,7 +65,6 @@ import org.fdroid.fdroid.net.BluetoothDownloader;
 import org.fdroid.fdroid.net.Downloader;
 import org.fdroid.fdroid.net.HttpDownloader;
 import org.fdroid.fdroid.qr.CameraCharacteristicsChecker;
-import org.fdroid.fdroid.qr.QrGenAsyncTask;
 import org.fdroid.fdroid.views.main.MainActivity;
 
 import java.util.Date;
@@ -75,6 +75,9 @@ import java.util.Set;
 import java.util.Timer;
 import java.util.TimerTask;
 
+import cc.mvdan.accesspoint.WifiApControl;
+import io.reactivex.rxjava3.disposables.CompositeDisposable;
+
 import static org.fdroid.fdroid.views.main.MainActivity.ACTION_REQUEST_SWAP;
 
 /**
@@ -103,7 +106,7 @@ public class SwapWorkflowActivity extends AppCompatActivity {
     private static final int REQUEST_WRITE_SETTINGS_PERMISSION = 5;
     private static final int STEP_INTRO = 1;  // TODO remove this special case, only use layoutResIds
 
-    private Toolbar toolbar;
+    private MaterialToolbar toolbar;
     private SwapView currentView;
     private boolean hasPreparedLocalRepo;
     private boolean newIntent;
@@ -116,6 +119,8 @@ public class SwapWorkflowActivity extends AppCompatActivity {
     @LayoutRes
     private int currentSwapViewLayoutRes = STEP_INTRO;
 
+    private final CompositeDisposable compositeDisposable = new CompositeDisposable();
+
     public static void requestSwap(Context context, String repo) {
         requestSwap(context, Uri.parse(repo));
     }
@@ -197,7 +202,11 @@ public class SwapWorkflowActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
-        ((FDroidApp) getApplication()).setSecureWindow(this);
+        FDroidApp fdroidApp = (FDroidApp) getApplication();
+        fdroidApp.setSecureWindow(this);
+
+        fdroidApp.applyPureBlackBackgroundInDarkTheme(this);
+
         super.onCreate(savedInstanceState);
 
         currentView = new SwapView(this); // dummy placeholder to avoid NullPointerExceptions;
@@ -210,8 +219,7 @@ public class SwapWorkflowActivity extends AppCompatActivity {
 
         setContentView(R.layout.swap_activity);
 
-        toolbar = (Toolbar) findViewById(R.id.toolbar);
-        toolbar.setTitleTextAppearance(getApplicationContext(), R.style.SwapTheme_Wizard_Text_Toolbar);
+        toolbar = findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
 
         container = (ViewGroup) findViewById(R.id.container);
@@ -220,7 +228,7 @@ public class SwapWorkflowActivity extends AppCompatActivity {
         localBroadcastManager.registerReceiver(downloaderInterruptedReceiver,
                 new IntentFilter(Downloader.ACTION_INTERRUPTED));
 
-        wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
+        wifiManager = ContextCompat.getSystemService(getApplicationContext(), WifiManager.class);
         wifiApControl = WifiApControl.getInstance(this);
 
         bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
@@ -230,6 +238,7 @@ public class SwapWorkflowActivity extends AppCompatActivity {
 
     @Override
     protected void onDestroy() {
+        compositeDisposable.dispose();
         localBroadcastManager.unregisterReceiver(downloaderInterruptedReceiver);
         unbindService(serviceConnection);
         super.onDestroy();
@@ -268,8 +277,7 @@ public class SwapWorkflowActivity extends AppCompatActivity {
         CharSequence title = getString(titleResId);
         next.setTitle(title);
         next.setTitleCondensed(title);
-        MenuItemCompat.setShowAsAction(next,
-                MenuItemCompat.SHOW_AS_ACTION_ALWAYS | MenuItemCompat.SHOW_AS_ACTION_WITH_TEXT);
+        next.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS | MenuItem.SHOW_AS_ACTION_WITH_TEXT);
         next.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
             @Override
             public boolean onMenuItemClick(MenuItem item) {
@@ -298,8 +306,8 @@ public class SwapWorkflowActivity extends AppCompatActivity {
         SearchView searchView = new SearchView(this);
 
         MenuItem searchMenuItem = menu.findItem(R.id.action_search);
-        MenuItemCompat.setActionView(searchMenuItem, searchView);
-        MenuItemCompat.setShowAsAction(searchMenuItem, MenuItemCompat.SHOW_AS_ACTION_IF_ROOM);
+        searchMenuItem.setActionView(searchView);
+        searchMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
 
         searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
 
@@ -485,14 +493,13 @@ public class SwapWorkflowActivity extends AppCompatActivity {
         getSwapService().initTimer();
 
         container.removeAllViews();
-        View view = ((LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE)).inflate(viewRes, container, false);
+        View view = ContextCompat.getSystemService(this, LayoutInflater.class)
+                .inflate(viewRes, container, false);
         currentView = (SwapView) view;
         currentView.setLayoutResId(viewRes);
         currentSwapViewLayoutRes = viewRes;
 
-        toolbar.setBackgroundColor(currentView.getToolbarColour());
         toolbar.setTitle(currentView.getToolbarTitle());
-        toolbar.setNavigationIcon(R.drawable.ic_close_white_24dp);
         toolbar.setNavigationOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
@@ -590,7 +597,7 @@ public class SwapWorkflowActivity extends AppCompatActivity {
     }
 
     private void sendFDroidApk() {
-        ((FDroidApp) getApplication()).sendViaBluetooth(this, Activity.RESULT_OK, BuildConfig.APPLICATION_ID);
+        ((FDroidApp) getApplication()).sendViaBluetooth(this, AppCompatActivity.RESULT_OK, BuildConfig.APPLICATION_ID);
     }
 
     /**
@@ -692,6 +699,7 @@ public class SwapWorkflowActivity extends AppCompatActivity {
 
     @Override
     public void onActivityResult(int requestCode, int resultCode, Intent intent) {
+        super.onActivityResult(requestCode, resultCode, intent);
         IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
         if (scanResult != null) {
             if (scanResult.getContents() != null) {
@@ -771,7 +779,7 @@ public class SwapWorkflowActivity extends AppCompatActivity {
     private final BroadcastReceiver bluetoothScanModeChanged = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
-            SwitchCompat bluetoothSwitch = container.findViewById(R.id.switch_bluetooth);
+            SwitchMaterial bluetoothSwitch = container.findViewById(R.id.switch_bluetooth);
             TextView textBluetoothVisible = container.findViewById(R.id.bluetooth_visible);
             if (bluetoothSwitch == null || textBluetoothVisible == null
                     || !BluetoothManager.ACTION_STATUS.equals(intent.getAction())) {
@@ -925,17 +933,23 @@ public class SwapWorkflowActivity extends AppCompatActivity {
         ImageView qrImage = container.findViewById(R.id.wifi_qr_code);
         if (qrUriString != null && qrImage != null) {
             Utils.debugLog(TAG, "Encoded swap URI in QR Code: " + qrUriString);
-            new QrGenAsyncTask(SwapWorkflowActivity.this, R.id.wifi_qr_code).execute(qrUriString);
 
-            // Replace all blacks with the background blue.
-            qrImage.setColorFilter(new LightingColorFilter(0xffffffff, getResources().getColor(R.color.swap_blue)));
+            compositeDisposable.add(Utils.generateQrBitmap(this, qrUriString)
+                    .subscribe(qrBitmap -> {
+                        qrImage.setImageBitmap(qrBitmap);
 
-            final View qrWarningMessage = container.findViewById(R.id.warning_qr_scanner);
-            if (CameraCharacteristicsChecker.getInstance(this).hasAutofocus()) {
-                qrWarningMessage.setVisibility(View.GONE);
-            } else {
-                qrWarningMessage.setVisibility(View.VISIBLE);
-            }
+                        // Replace all blacks with the background blue.
+                        qrImage.setColorFilter(new LightingColorFilter(0xffffffff,
+                                ContextCompat.getColor(this, R.color.swap_blue)));
+
+                        final View qrWarningMessage = container.findViewById(R.id.warning_qr_scanner);
+                        if (CameraCharacteristicsChecker.getInstance(this).hasAutofocus()) {
+                            qrWarningMessage.setVisibility(View.GONE);
+                        } else {
+                            qrWarningMessage.setVisibility(View.VISIBLE);
+                        }
+                    })
+            );
         }
     }
 
@@ -954,19 +968,19 @@ public class SwapWorkflowActivity extends AppCompatActivity {
         if (TextUtils.isEmpty(FDroidApp.bssid) && !TextUtils.isEmpty(FDroidApp.ipAddressString)) {
             // empty bssid with an ipAddress means hotspot mode
             descriptionView.setText(R.string.swap_join_this_hotspot);
-            wifiIcon.setImageDrawable(getResources().getDrawable(R.drawable.hotspot));
+            wifiIcon.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.ic_wifi_tethering));
             ssidView.setText(R.string.swap_active_hotspot);
             tapView.setText(R.string.swap_switch_to_wifi);
         } else if (TextUtils.isEmpty(FDroidApp.ssid)) {
             // not connected to or setup with any wifi network
             descriptionView.setText(R.string.swap_join_same_wifi);
-            wifiIcon.setImageDrawable(getResources().getDrawable(R.drawable.wifi));
+            wifiIcon.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.ic_wifi));
             ssidView.setText(R.string.swap_no_wifi_network);
             tapView.setText(R.string.swap_view_available_networks);
         } else {
             // connected to a regular wifi network
             descriptionView.setText(R.string.swap_join_same_wifi);
-            wifiIcon.setImageDrawable(getResources().getDrawable(R.drawable.wifi));
+            wifiIcon.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.ic_wifi));
             ssidView.setText(FDroidApp.ssid);
             tapView.setText(R.string.swap_view_available_networks);
         }
@@ -982,7 +996,7 @@ public class SwapWorkflowActivity extends AppCompatActivity {
             }
         });
 
-        SwitchCompat wifiSwitch = findViewById(R.id.switch_wifi);
+        SwitchMaterial wifiSwitch = findViewById(R.id.switch_wifi);
         wifiSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
@@ -1106,7 +1120,7 @@ public class SwapWorkflowActivity extends AppCompatActivity {
     private final BroadcastReceiver bluetoothStatus = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
-            SwitchCompat bluetoothSwitch = container.findViewById(R.id.switch_bluetooth);
+            SwitchMaterial bluetoothSwitch = container.findViewById(R.id.switch_bluetooth);
             TextView textBluetoothVisible = container.findViewById(R.id.bluetooth_visible);
             TextView textDeviceIdBluetooth = container.findViewById(R.id.device_id_bluetooth);
             TextView peopleNearbyText = container.findViewById(R.id.text_people_nearby);

app/src/full/java/org/fdroid/fdroid/nearby/TreeUriScannerIntentService.java

@@ -20,7 +20,6 @@
 package org.fdroid.fdroid.nearby;
 
 import android.annotation.TargetApi;
-import android.app.Activity;
 import android.app.IntentService;
 import android.content.ContentResolver;
 import android.content.Context;
@@ -28,15 +27,14 @@ import android.content.Intent;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Process;
-import android.support.v4.provider.DocumentFile;
 import android.util.Log;
 import android.widget.Toast;
+
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.IOUtils;
 import org.fdroid.fdroid.AddRepoIntentService;
 import org.fdroid.fdroid.IndexUpdater;
 import org.fdroid.fdroid.IndexV1Updater;
-import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.Utils;
 import org.fdroid.fdroid.data.Repo;
@@ -51,6 +49,8 @@ import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
 import java.util.jar.JarInputStream;
 
+import androidx.documentfile.provider.DocumentFile;
+
 /**
  * An {@link IntentService} subclass for handling asynchronous scanning of a
  * removable storage device like an SD Card or USB OTG thumb drive using the
@@ -76,18 +76,21 @@ public class TreeUriScannerIntentService extends IntentService {
     public static final String TAG = "TreeUriScannerIntentSer";
 
     private static final String ACTION_SCAN_TREE_URI = "org.fdroid.fdroid.nearby.action.SCAN_TREE_URI";
+    /**
+     * @see <a href="https://android.googlesource.com/platform/frameworks/base/+/android-10.0.0_r38/core/java/android/provider/DocumentsContract.java#238">DocumentsContract.EXTERNAL_STORAGE_PROVIDER_AUTHORITY</a>
+     * @see <a href="https://android.googlesource.com/platform/frameworks/base/+/android-10.0.0_r38/packages/ExternalStorageProvider/src/com/android/externalstorage/ExternalStorageProvider.java#70">ExternalStorageProvider.AUTHORITY</a>
+     */
+    public static final String EXTERNAL_STORAGE_PROVIDER_AUTHORITY = "com.android.externalstorage.documents";
 
     public TreeUriScannerIntentService() {
         super("TreeUriScannerIntentService");
     }
 
     public static void scan(Context context, Uri data) {
-        if (Preferences.get().isScanRemovableStorageEnabled()) {
-            Intent intent = new Intent(context, TreeUriScannerIntentService.class);
-            intent.setAction(ACTION_SCAN_TREE_URI);
-            intent.setData(data);
-            context.startService(intent);
-        }
+        Intent intent = new Intent(context, TreeUriScannerIntentService.class);
+        intent.setAction(ACTION_SCAN_TREE_URI);
+        intent.setData(data);
+        context.startService(intent);
     }
 
     /**
@@ -95,17 +98,20 @@ public class TreeUriScannerIntentService extends IntentService {
      * {@link TreeUriScannerIntentService} or whether it is External Storage
      * like an SD Card that can be directly accessed via the file system.
      */
-    public static void onActivityResult(Activity activity, Intent intent) {
+    public static void onActivityResult(Context context, Intent intent) {
+        if (intent == null) {
+            return;
+        }
         Uri uri = intent.getData();
         if (uri != null) {
             if (Build.VERSION.SDK_INT >= 19) {
-                ContentResolver contentResolver = activity.getContentResolver();
+                ContentResolver contentResolver = context.getContentResolver();
                 int perms = Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION;
                 contentResolver.takePersistableUriPermission(uri, perms);
             }
-            String msg = String.format(activity.getString(R.string.swap_toast_using_path), uri.toString());
-            Toast.makeText(activity, msg, Toast.LENGTH_SHORT).show();
-            scan(activity, uri);
+            String msg = String.format(context.getString(R.string.swap_toast_using_path), uri.toString());
+            Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
+            scan(context, uri);
         }
     }
 

app/src/full/java/org/fdroid/fdroid/nearby/TreeUriUtils.java

@@ -7,12 +7,14 @@ import android.net.Uri;
 import android.os.Build;
 import android.os.storage.StorageManager;
 import android.provider.DocumentsContract;
-import android.support.annotation.Nullable;
 
 import java.io.File;
 import java.lang.reflect.Array;
 import java.lang.reflect.Method;
 
+import androidx.annotation.Nullable;
+import androidx.core.content.ContextCompat;
+
 
 /**
  * @see <a href="https://stackoverflow.com/a/36162691">Android 5.0 DocumentFile from tree URI</a>
@@ -47,8 +49,7 @@ public final class TreeUriUtils {
     private static String getVolumePath(final String volumeId, Context context) {
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) return null;
         try {
-            StorageManager mStorageManager =
-                    (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
+            StorageManager mStorageManager = ContextCompat.getSystemService(context, StorageManager.class);
             Class<?> storageVolumeClazz = Class.forName("android.os.storage.StorageVolume");
             Method getVolumeList = mStorageManager.getClass().getMethod("getVolumeList");
             Method getUuid = storageVolumeClazz.getMethod("getUuid");

app/src/full/java/org/fdroid/fdroid/nearby/UsbDeviceAttachedReceiver.java

@@ -19,72 +19,47 @@
 
 package org.fdroid.fdroid.nearby;
 
-import android.app.Activity;
 import android.content.BroadcastReceiver;
-import android.content.ComponentName;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
-import android.content.IntentFilter;
 import android.content.UriPermission;
 import android.database.ContentObserver;
 import android.hardware.usb.UsbManager;
 import android.net.Uri;
 import android.os.Build;
-import android.os.Bundle;
 import android.os.Handler;
-import android.support.annotation.Nullable;
-import android.support.annotation.RequiresApi;
 import android.text.TextUtils;
 import android.util.Log;
-import org.fdroid.fdroid.views.main.MainActivity;
+
 import org.fdroid.fdroid.views.main.NearbyViewBinder;
 
-import java.util.HashMap;
+import androidx.annotation.RequiresApi;
+
 
 /**
  * This is just a shim to receive {@link UsbManager#ACTION_USB_ACCESSORY_ATTACHED}
- * events then open up the right screen in {@link MainActivity}.
+ * events.
  */
-public class UsbDeviceAttachedActivity extends Activity {
-    public static final String TAG = "UsbDeviceAttachedActivi";
+public class UsbDeviceAttachedReceiver extends BroadcastReceiver {
+    public static final String TAG = "UsbDeviceAttachedReceiv";
 
-    private static final HashMap<Uri, ContentObserver> contentObservers = new HashMap<>();
 
     @RequiresApi(api = 19)
     @Override
-    protected void onCreate(@Nullable Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-
+    public void onReceive(final Context context, Intent intent) {
         if (Build.VERSION.SDK_INT < 19) {
-            finish();
             return;
         }
 
-        Intent intent = getIntent();
         if (intent == null || TextUtils.isEmpty(intent.getAction())
                 || !UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(intent.getAction())) {
             Log.i(TAG, "ignoring irrelevant intent: " + intent);
-            finish();
             return;
         }
         Log.i(TAG, "handling intent: " + intent);
 
-        final ContentResolver contentResolver = getContentResolver();
-        BroadcastReceiver receiver = new BroadcastReceiver() {
-            @Override
-            public void onReceive(Context context, Intent intent) {
-                if (!UsbManager.ACTION_USB_DEVICE_DETACHED.equals(intent.getAction())) {
-                    return;
-                }
-                NearbyViewBinder.updateUsbOtg(UsbDeviceAttachedActivity.this);
-                unregisterReceiver(this);
-                for (ContentObserver contentObserver : contentObservers.values()) {
-                    contentResolver.unregisterContentObserver(contentObserver);
-                }
-            }
-        };
-        registerReceiver(receiver, new IntentFilter(UsbManager.ACTION_USB_DEVICE_DETACHED));
+        final ContentResolver contentResolver = context.getContentResolver();
 
         for (final UriPermission uriPermission : contentResolver.getPersistedUriPermissions()) {
             Uri uri = uriPermission.getUri();
@@ -92,21 +67,11 @@ public class UsbDeviceAttachedActivity extends Activity {
 
                 @Override
                 public void onChange(boolean selfChange, Uri uri) {
-                    NearbyViewBinder.updateUsbOtg(UsbDeviceAttachedActivity.this);
+                    NearbyViewBinder.updateUsbOtg(context);
                 }
             };
             contentResolver.registerContentObserver(uri, true, contentObserver);
+            UsbDeviceDetachedReceiver.contentObservers.put(uri, contentObserver);
         }
-        intent.setComponent(new ComponentName(this, MainActivity.class));
-        intent.putExtra(MainActivity.EXTRA_VIEW_NEARBY, true);
-        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
-        startActivity(intent);
-        finish();
-    }
-
-    @Override
-    public void finish() {
-        setResult(RESULT_OK);
-        super.finish();
     }
 }

app/src/full/java/org/fdroid/fdroid/nearby/UsbDeviceDetachedReceiver.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2018-2019 Hans-Christoph Steiner <hans@eds.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+package org.fdroid.fdroid.nearby;
+
+import android.content.BroadcastReceiver;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.Intent;
+import android.database.ContentObserver;
+import android.hardware.usb.UsbManager;
+import android.net.Uri;
+import android.os.Build;
+import android.text.TextUtils;
+import android.util.Log;
+
+import org.fdroid.fdroid.views.main.NearbyViewBinder;
+
+import java.util.HashMap;
+
+import androidx.annotation.RequiresApi;
+
+/**
+ * This is just a shim to receive {@link UsbManager#ACTION_USB_DEVICE_DETACHED}
+ * events.
+ */
+public class UsbDeviceDetachedReceiver extends BroadcastReceiver {
+    public static final String TAG = "UsbDeviceDetachedReceiv";
+
+    static final HashMap<Uri, ContentObserver> contentObservers = new HashMap<>();
+
+    @RequiresApi(api = 19)
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        if (Build.VERSION.SDK_INT < 19) {
+            return;
+        }
+
+        if (intent == null || TextUtils.isEmpty(intent.getAction())
+                || !UsbManager.ACTION_USB_DEVICE_DETACHED.equals(intent.getAction())) {
+            Log.i(TAG, "ignoring irrelevant intent: " + intent);
+            return;
+        }
+        Log.i(TAG, "handling intent: " + intent);
+
+        final ContentResolver contentResolver = context.getContentResolver();
+        NearbyViewBinder.updateUsbOtg(context);
+        for (ContentObserver contentObserver : contentObservers.values()) {
+            contentResolver.unregisterContentObserver(contentObserver);
+        }
+    }
+}

app/src/full/java/org/fdroid/fdroid/nearby/UsbDeviceMediaMountedReceiver.java

@@ -0,0 +1,24 @@
+package org.fdroid.fdroid.nearby;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Environment;
+
+import org.fdroid.fdroid.views.main.NearbyViewBinder;
+
+public class UsbDeviceMediaMountedReceiver extends BroadcastReceiver {
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        if (intent == null || intent.getAction() == null) {
+            return;
+        }
+        String action = intent.getAction();
+        if (Environment.MEDIA_BAD_REMOVAL.equals(action)
+                || Environment.MEDIA_MOUNTED.equals(action)
+                || Environment.MEDIA_REMOVED.equals(action)
+                || Environment.MEDIA_EJECTING.equals(action)) {
+            NearbyViewBinder.updateUsbOtg(context);
+        }
+    }
+}

app/src/full/java/org/fdroid/fdroid/nearby/WifiStateChangeReceiver.java

@@ -4,6 +4,7 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.net.wifi.WifiManager;
+
 import org.fdroid.fdroid.Utils;
 
 public class WifiStateChangeReceiver extends BroadcastReceiver {

app/src/full/java/org/fdroid/fdroid/nearby/WifiStateChangeService.java

@@ -10,11 +10,13 @@ import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 import android.os.Build;
-import android.support.annotation.Nullable;
-import android.support.v4.content.LocalBroadcastManager;
 import android.text.TextUtils;
 import android.util.Log;
-import cc.mvdan.accesspoint.WifiApControl;
+
+import androidx.annotation.Nullable;
+import androidx.core.content.ContextCompat;
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
+
 import org.apache.commons.net.util.SubnetUtils;
 import org.fdroid.fdroid.BuildConfig;
 import org.fdroid.fdroid.FDroidApp;
@@ -33,6 +35,9 @@ import java.security.cert.Certificate;
 import java.util.Enumeration;
 import java.util.Locale;
 
+import cc.mvdan.accesspoint.WifiApControl;
+import io.reactivex.rxjava3.disposables.CompositeDisposable;
+
 /**
  * Handle state changes to the device's wifi, storing the required bits.
  * The {@link Intent} that starts it either has no extras included,
@@ -67,6 +72,8 @@ public class WifiStateChangeService extends IntentService {
     private static int previousWifiState = Integer.MIN_VALUE;
     private static int wifiState;
 
+    private final CompositeDisposable compositeDisposable = new CompositeDisposable();
+
     public WifiStateChangeService() {
         super("WifiStateChangeService");
     }
@@ -79,6 +86,12 @@ public class WifiStateChangeService extends IntentService {
         context.startService(intent);
     }
 
+    @Override
+    public void onDestroy() {
+        compositeDisposable.dispose();
+        super.onDestroy();
+    }
+
     @Override
     protected void onHandleIntent(Intent intent) {
         android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_LOWEST);
@@ -88,7 +101,7 @@ public class WifiStateChangeService extends IntentService {
         }
         Utils.debugLog(TAG, "WiFi change service started.");
         NetworkInfo ni = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
-        wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
+        wifiManager = ContextCompat.getSystemService(getApplicationContext(), WifiManager.class);
         wifiState = wifiManager.getWifiState();
         Utils.debugLog(TAG, "ni == " + ni + "  wifiState == " + printWifiState(wifiState));
         if (ni == null
@@ -106,7 +119,7 @@ public class WifiStateChangeService extends IntentService {
             }
 
             if (Build.VERSION.SDK_INT < 21 && wifiState == WifiManager.WIFI_STATE_ENABLED) {
-                UpdateService.scheduleIfStillOnWifi(this);
+                compositeDisposable.add(UpdateService.scheduleIfStillOnWifi(this).subscribe());
             }
         }
     }
@@ -257,7 +270,11 @@ public class WifiStateChangeService extends IntentService {
                 Utils.debugLog(TAG, "WifiConfiguration: " + wifiConfiguration);
                 if (wifiConfiguration == null) {
                     FDroidApp.ssid = getString(R.string.swap_active_hotspot, "");
-                } else if (wifiConfiguration.hiddenSSID) {
+                    FDroidApp.bssid = "";
+                    return;
+                }
+
+                if (wifiConfiguration.hiddenSSID) {
                     FDroidApp.ssid = getString(R.string.swap_hidden_wifi_ssid);
                 } else {
                     FDroidApp.ssid = wifiConfiguration.SSID;

app/src/full/java/org/fdroid/fdroid/nearby/peers/BluetoothPeer.java

@@ -3,10 +3,12 @@ package org.fdroid.fdroid.nearby.peers;
 import android.bluetooth.BluetoothClass.Device;
 import android.bluetooth.BluetoothDevice;
 import android.os.Parcel;
-import android.support.annotation.Nullable;
 import android.text.TextUtils;
+
 import org.fdroid.fdroid.R;
 
+import androidx.annotation.Nullable;
+
 public class BluetoothPeer implements Peer {
 
     private static final String BLUETOOTH_NAME_TAG = "FDroid:";
@@ -44,7 +46,7 @@ public class BluetoothPeer implements Peer {
 
     @Override
     public int getIcon() {
-        return R.drawable.ic_bluetooth_white;
+        return R.drawable.ic_bluetooth;
     }
 
     @Override

app/src/full/java/org/fdroid/fdroid/nearby/peers/BonjourPeer.java

@@ -2,13 +2,15 @@ package org.fdroid.fdroid.nearby.peers;
 
 import android.net.Uri;
 import android.os.Parcel;
-import android.support.annotation.Nullable;
 import android.text.TextUtils;
+
 import org.fdroid.fdroid.FDroidApp;
 
 import javax.jmdns.ServiceInfo;
 import javax.jmdns.impl.FDroidServiceInfo;
 
+import androidx.annotation.Nullable;
+
 public class BonjourPeer extends WifiPeer {
     private static final String TAG = "BonjourPeer";
 

app/src/full/java/org/fdroid/fdroid/nearby/peers/Peer.java

@@ -1,7 +1,8 @@
 package org.fdroid.fdroid.nearby.peers;
 
 import android.os.Parcelable;
-import android.support.annotation.DrawableRes;
+
+import androidx.annotation.DrawableRes;
 
 /**
  * TODO This model assumes that "peers" from Bluetooth, Bonjour, and WiFi are

app/src/full/java/org/fdroid/fdroid/nearby/peers/WifiPeer.java

@@ -3,6 +3,7 @@ package org.fdroid.fdroid.nearby.peers;
 import android.net.Uri;
 import android.os.Parcel;
 import android.text.TextUtils;
+
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.data.NewRepoConfig;
 
@@ -62,7 +63,7 @@ public class WifiPeer implements Peer {
 
     @Override
     public int getIcon() {
-        return R.drawable.ic_network_wifi_white;
+        return R.drawable.ic_wifi;
     }
 
     @Override

app/src/full/java/org/fdroid/fdroid/panic/CalculatorActivity.java

@@ -1,17 +1,21 @@
 package org.fdroid.fdroid.panic;
 
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.Toolbar;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
 import android.widget.Toast;
+
+import com.google.android.material.appbar.MaterialToolbar;
+
+import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.R;
 
 import java.util.regex.Pattern;
 
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+
 /**
  * A very hacky calculator which is barely functional.
  * It is just meant to pass a very casual inspection.
@@ -35,10 +39,13 @@ public class CalculatorActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
+        FDroidApp fdroidApp = (FDroidApp) getApplication();
+        fdroidApp.applyPureBlackBackgroundInDarkTheme(this);
+
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_calculator);
 
-        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        MaterialToolbar toolbar = findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
 
         textView = (TextView) findViewById(R.id.textView);

app/src/full/java/org/fdroid/fdroid/panic/DestructiveCheckBoxPreference.java

@@ -1,13 +1,15 @@
 package org.fdroid.fdroid.panic;
 
 import android.content.Context;
-import android.content.res.Resources;
-import android.support.v7.preference.CheckBoxPreference;
-import android.support.v7.preference.PreferenceViewHolder;
 import android.util.AttributeSet;
+
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.R;
 
+import androidx.core.content.ContextCompat;
+import androidx.preference.CheckBoxPreference;
+import androidx.preference.PreferenceViewHolder;
+
 public class DestructiveCheckBoxPreference extends CheckBoxPreference {
     public DestructiveCheckBoxPreference(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
@@ -31,11 +33,10 @@ public class DestructiveCheckBoxPreference extends CheckBoxPreference {
         if (!holder.itemView.isEnabled()) {
             return;
         }
-        Resources resources = getContext().getResources();
         if (FDroidApp.isAppThemeLight()) {
-            holder.itemView.setBackgroundColor(resources.getColor(R.color.panic_destructive_light));
+            holder.itemView.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.panic_destructive_light));
         } else {
-            holder.itemView.setBackgroundColor(resources.getColor(R.color.panic_destructive_dark));
+            holder.itemView.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.panic_destructive_dark));
         }
     }
 }

app/src/full/java/org/fdroid/fdroid/panic/DestructivePreference.java

@@ -1,12 +1,15 @@
 package org.fdroid.fdroid.panic;
 
 import android.content.Context;
-import android.support.v7.preference.Preference;
-import android.support.v7.preference.PreferenceViewHolder;
 import android.util.AttributeSet;
+
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.R;
 
+import androidx.core.content.ContextCompat;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceViewHolder;
+
 public class DestructivePreference extends Preference {
     public DestructivePreference(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
@@ -28,9 +31,9 @@ public class DestructivePreference extends Preference {
     public void onBindViewHolder(PreferenceViewHolder holder) {
         super.onBindViewHolder(holder);
         if (FDroidApp.isAppThemeLight()) {
-            holder.itemView.setBackgroundColor(getContext().getResources().getColor(R.color.panic_destructive_light));
+            holder.itemView.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.panic_destructive_light));
         } else {
-            holder.itemView.setBackgroundColor(getContext().getResources().getColor(R.color.panic_destructive_dark));
+            holder.itemView.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.panic_destructive_dark));
         }
     }
 }

app/src/full/java/org/fdroid/fdroid/panic/ExitActivity.java

@@ -3,7 +3,8 @@ package org.fdroid.fdroid.panic;
 import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
+
+import androidx.appcompat.app.AppCompatActivity;
 
 public class ExitActivity extends AppCompatActivity {
 

app/src/full/java/org/fdroid/fdroid/panic/HidingManager.java

@@ -7,12 +7,14 @@ import android.content.Intent;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.ServiceInfo;
-import android.support.v4.app.NotificationManagerCompat;
-import android.support.v7.app.AlertDialog;
+
 import org.fdroid.fdroid.BuildConfig;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.views.main.MainActivity;
 
+import androidx.appcompat.app.AlertDialog;
+import androidx.core.app.NotificationManagerCompat;
+
 /**
  * This class is encapsulating all methods related to hiding the app from the launcher
  * and restoring it.

app/src/full/java/org/fdroid/fdroid/panic/PanicPreferencesActivity.java

@@ -1,37 +1,32 @@
 package org.fdroid.fdroid.panic;
 
 import android.os.Bundle;
-import android.support.v7.app.ActionBar;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.Toolbar;
-import android.view.MenuItem;
+import android.view.View;
+
+import com.google.android.material.appbar.MaterialToolbar;
+
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.R;
 
+import androidx.appcompat.app.AppCompatActivity;
+
 public class PanicPreferencesActivity extends AppCompatActivity {
 
     @Override
     public void onCreate(Bundle bundle) {
-        ((FDroidApp) getApplication()).applyTheme(this);
+        FDroidApp fdroidApp = (FDroidApp) getApplication();
+        fdroidApp.applyPureBlackBackgroundInDarkTheme(this);
+
         super.onCreate(bundle);
         setContentView(R.layout.activity_panic_settings);
 
-        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
-        setSupportActionBar(toolbar);
-        ActionBar ab = getSupportActionBar();
-        if (ab != null) {
-            ab.setDisplayShowHomeEnabled(true);
-            ab.setDisplayHomeAsUpEnabled(true);
-        }
+        MaterialToolbar toolbar = findViewById(R.id.toolbar);
+        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                // Handle navigation icon press
+                onBackPressed();
+            }
+        });
     }
-
-    @Override
-    public boolean onOptionsItemSelected(MenuItem item) {
-        if (item.getItemId() == android.R.id.home) {
-            onBackPressed();
-            return true;
-        }
-        return super.onOptionsItemSelected(item);
-    }
-
 }

app/src/full/java/org/fdroid/fdroid/panic/PanicPreferencesFragment.java

@@ -1,6 +1,5 @@
 package org.fdroid.fdroid.panic;
 
-import android.app.Activity;
 import android.content.ComponentName;
 import android.content.DialogInterface;
 import android.content.Intent;
@@ -13,19 +12,9 @@ import android.graphics.PorterDuff;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Bundle;
-import android.support.annotation.ColorInt;
-import android.support.annotation.Nullable;
-import android.support.v14.preference.PreferenceFragment;
-import android.support.v4.content.ContextCompat;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.preference.CheckBoxPreference;
-import android.support.v7.preference.ListPreference;
-import android.support.v7.preference.Preference;
-import android.support.v7.preference.PreferenceCategory;
 import android.text.TextUtils;
 import android.util.TypedValue;
-import info.guardianproject.panic.Panic;
-import info.guardianproject.panic.PanicResponder;
+
 import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.installer.PrivilegedInstaller;
@@ -33,7 +22,20 @@ import org.fdroid.fdroid.installer.PrivilegedInstaller;
 import java.util.ArrayList;
 import java.util.Set;
 
-public class PanicPreferencesFragment extends PreferenceFragment
+import androidx.annotation.ColorInt;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
+import androidx.preference.CheckBoxPreference;
+import androidx.preference.ListPreference;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceFragmentCompat;
+import info.guardianproject.panic.Panic;
+import info.guardianproject.panic.PanicResponder;
+
+public class PanicPreferencesFragment extends PreferenceFragmentCompat
         implements SharedPreferences.OnSharedPreferenceChangeListener {
 
     private static final String PREF_APP = "pref_panic_app";
@@ -80,7 +82,7 @@ public class PanicPreferencesFragment extends PreferenceFragment
                     prefHide.setEnabled(false);
                     prefResetRepos.setChecked(false);
                     prefResetRepos.setEnabled(false);
-                    getActivity().setResult(Activity.RESULT_CANCELED);
+                    getActivity().setResult(AppCompatActivity.RESULT_CANCELED);
                 } else {
                     prefHide.setEnabled(true);
                     prefResetRepos.setEnabled(true);
@@ -129,9 +131,9 @@ public class PanicPreferencesFragment extends PreferenceFragment
                 }
             }
         } else {
-            Preference preference = new Preference(getActivity());
+            Preference preference = new Preference(requireActivity());
             preference.setIntent(intent);
-            Drawable icon = getResources().getDrawable(R.drawable.ic_add_circle_outline_white);
+            Drawable icon = ContextCompat.getDrawable(requireContext(), R.drawable.ic_add_circle_outline);
             icon.setColorFilter(new LightingColorFilter(0, getResources().getColor(R.color.swap_light_grey_icon)));
             preference.setSingleLineTitle(true);
             preference.setTitle(R.string.panic_add_apps_to_uninstall);
@@ -232,13 +234,13 @@ public class PanicPreferencesFragment extends PreferenceFragment
             public void onClick(DialogInterface dialogInterface, int i) {
                 PanicResponder.setTriggerPackageName(getActivity());
                 showPanicApp(PanicResponder.getTriggerPackageName(getActivity()));
-                getActivity().setResult(Activity.RESULT_OK);
+                getActivity().setResult(AppCompatActivity.RESULT_OK);
             }
         };
         DialogInterface.OnClickListener cancelListener = new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialogInterface, int i) {
-                getActivity().setResult(Activity.RESULT_CANCELED);
+                getActivity().setResult(AppCompatActivity.RESULT_CANCELED);
                 getActivity().finish();
             }
         };

app/src/full/java/org/fdroid/fdroid/panic/PanicResponderActivity.java

@@ -1,17 +1,13 @@
 package org.fdroid.fdroid.panic;
 
-import android.app.Activity;
 import android.content.BroadcastReceiver;
 import android.content.ContentValues;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
-import android.support.v4.content.LocalBroadcastManager;
-import android.support.v7.app.AppCompatActivity;
 import android.util.Log;
-import info.guardianproject.panic.Panic;
-import info.guardianproject.panic.PanicResponder;
+
 import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.data.Apk;
 import org.fdroid.fdroid.data.DBHelper;
@@ -31,16 +27,21 @@ import java.util.List;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
+import info.guardianproject.panic.Panic;
+import info.guardianproject.panic.PanicResponder;
+
 /**
- * This {@link Activity} is purely to run events in response to a panic trigger.
- * It needs to be an {@code Activity} rather than a {@link android.app.Service}
+ * This {@link AppCompatActivity} is purely to run events in response to a panic trigger.
+ * It needs to be an {@code AppCompatActivity} rather than a {@link android.app.Service}
  * so that it can fetch some of the required information about what sent the
- * {@link Intent}.  This is therefore an {@code Activity} without any UI, which
+ * {@link Intent}.  This is therefore an {@code AppCompatActivity} without any UI, which
  * is a special case in Android.  All the code must be in
  * {@link #onCreate(Bundle)} and {@link #finish()} must be called at the end of
  * that method.
  *
- * @see PanicResponder#receivedTriggerFromConnectedApp(Activity)
+ * @see PanicResponder#receivedTriggerFromConnectedApp(AppCompatActivity)
  */
 public class PanicResponderActivity extends AppCompatActivity {
 

app/src/full/java/org/fdroid/fdroid/panic/SelectInstalledAppListAdapter.java

@@ -1,9 +1,8 @@
 package org.fdroid.fdroid.panic;
 
-import android.app.Activity;
-import android.support.annotation.NonNull;
 import android.view.View;
 import android.view.ViewGroup;
+
 import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.views.installed.InstalledAppListAdapter;
@@ -11,10 +10,13 @@ import org.fdroid.fdroid.views.installed.InstalledAppListItemController;
 
 import java.util.Set;
 
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
+
 public class SelectInstalledAppListAdapter extends InstalledAppListAdapter {
     private final Set<String> selectedApps;
 
-    SelectInstalledAppListAdapter(Activity activity) {
+    SelectInstalledAppListAdapter(AppCompatActivity activity) {
         super(activity);
         Preferences prefs = Preferences.get();
         selectedApps = prefs.getPanicWipeSet();

app/src/full/java/org/fdroid/fdroid/panic/SelectInstalledAppListItemController.java

@@ -1,9 +1,7 @@
 package org.fdroid.fdroid.panic;
 
-import android.app.Activity;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
 import android.view.View;
+
 import org.fdroid.fdroid.AppUpdateStatusManager;
 import org.fdroid.fdroid.data.App;
 import org.fdroid.fdroid.views.apps.AppListItemState;
@@ -11,6 +9,10 @@ import org.fdroid.fdroid.views.installed.InstalledAppListItemController;
 
 import java.util.Set;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+
 /**
  * Shows the currently installed apps as a selectable list.
  */
@@ -18,7 +20,7 @@ public class SelectInstalledAppListItemController extends InstalledAppListItemCo
 
     private final Set<String> selectedApps;
 
-    public SelectInstalledAppListItemController(Activity activity, View itemView, Set<String> selectedApps) {
+    public SelectInstalledAppListItemController(AppCompatActivity activity, View itemView, Set<String> selectedApps) {
         super(activity, itemView);
         this.selectedApps = selectedApps;
     }

app/src/full/java/org/fdroid/fdroid/panic/SelectInstalledAppsActivity.java

@@ -20,29 +20,29 @@
 package org.fdroid.fdroid.panic;
 
 import android.annotation.SuppressLint;
-import android.content.res.Resources;
 import android.database.Cursor;
-import android.graphics.LightingColorFilter;
-import android.graphics.drawable.Drawable;
 import android.os.Bundle;
-import android.support.annotation.NonNull;
-import android.support.v4.app.LoaderManager;
-import android.support.v4.content.CursorLoader;
-import android.support.v4.content.Loader;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.TextView;
+
+import com.google.android.material.appbar.MaterialToolbar;
+
 import org.fdroid.fdroid.FDroidApp;
 import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.data.InstalledAppProvider;
 import org.fdroid.fdroid.views.installed.InstalledAppListAdapter;
 
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.loader.app.LoaderManager;
+import androidx.loader.content.CursorLoader;
+import androidx.loader.content.Loader;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
 public class SelectInstalledAppsActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Cursor> {
 
     private InstalledAppListAdapter adapter;
@@ -54,13 +54,14 @@ public class SelectInstalledAppsActivity extends AppCompatActivity implements Lo
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
+        FDroidApp fdroidApp = (FDroidApp) getApplication();
+        fdroidApp.applyPureBlackBackgroundInDarkTheme(this);
 
-        ((FDroidApp) getApplication()).applyTheme(this);
         super.onCreate(savedInstanceState);
 
         setContentView(R.layout.installed_apps_layout);
 
-        Toolbar toolbar = findViewById(R.id.toolbar);
+        MaterialToolbar toolbar = findViewById(R.id.toolbar);
         toolbar.setTitle(getString(R.string.panic_add_apps_to_uninstall));
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
@@ -115,14 +116,7 @@ public class SelectInstalledAppsActivity extends AppCompatActivity implements Lo
         MenuItem menuItem = menu.add(R.string.menu_select_for_wipe);
         menuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
         checkId = menuItem.getItemId();
-        if (FDroidApp.isAppThemeLight()) {
-            Resources resources = getResources();
-            Drawable icon = resources.getDrawable(R.drawable.check);
-            icon.setColorFilter(new LightingColorFilter(0xffffffff, resources.getColor(android.R.color.white)));
-            menuItem.setIcon(icon);
-        } else {
-            menuItem.setIcon(R.drawable.check);
-        }
+        menuItem.setIcon(R.drawable.check);
         return true;
     }
 

app/src/full/java/org/fdroid/fdroid/views/main/CategoriesViewBinder.java

@@ -3,40 +3,44 @@ package org.fdroid.fdroid.views.main;
 import android.content.Intent;
 import android.database.Cursor;
 import android.os.Bundle;
-import android.support.design.widget.FloatingActionButton;
-import android.support.v4.app.LoaderManager;
-import android.support.v4.content.CursorLoader;
-import android.support.v4.content.Loader;
-import android.support.v4.widget.SwipeRefreshLayout;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.widget.FrameLayout;
 import android.widget.TextView;
 
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+
 import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.UpdateService;
 import org.fdroid.fdroid.Utils;
 import org.fdroid.fdroid.data.CategoryProvider;
 import org.fdroid.fdroid.data.Schema;
+import org.fdroid.fdroid.panic.HidingManager;
 import org.fdroid.fdroid.views.apps.AppListActivity;
 import org.fdroid.fdroid.views.categories.CategoryAdapter;
 import org.fdroid.fdroid.views.categories.CategoryController;
-import org.fdroid.fdroid.panic.HidingManager;
 
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.loader.app.LoaderManager;
+import androidx.loader.content.CursorLoader;
+import androidx.loader.content.Loader;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
+
 /**
  * Responsible for ensuring that the categories view is inflated and then populated correctly.
  * Will start a loader to get the list of categories from the database and populate a recycler
  * view with relevant info about each.
  */
 class CategoriesViewBinder implements LoaderManager.LoaderCallbacks<Cursor> {
+    public static final String TAG = "CategoriesViewBinder";
 
     private static final int LOADER_ID = 429820532;
 
@@ -92,10 +96,11 @@ class CategoriesViewBinder implements LoaderManager.LoaderCallbacks<Cursor> {
         activity.getSupportLoaderManager().restartLoader(LOADER_ID, null, this);
     }
 
+    @NonNull
     @Override
     public Loader<Cursor> onCreateLoader(int id, Bundle args) {
         if (id != LOADER_ID) {
-            return null;
+            throw new IllegalArgumentException("id != LOADER_ID");
         }
 
         return new CursorLoader(
@@ -110,7 +115,7 @@ class CategoriesViewBinder implements LoaderManager.LoaderCallbacks<Cursor> {
 
     /**
      * Reads all categories from the cursor and stores them in memory to provide to the {@link CategoryAdapter}.
-     *
+     * <p>
      * It does this so it is easier to deal with localized/unlocalized categories without having
      * to store the localized version in the database. It is not expected that the list of categories
      * will grow so large as to make this a performance concern. If it does in the future, the

app/src/full/java/org/fdroid/fdroid/views/main/MainViewController.java

@@ -1,14 +1,16 @@
 package org.fdroid.fdroid.views.main;
 
-import android.support.annotation.Nullable;
-import android.support.v4.app.Fragment;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.RecyclerView;
 import android.widget.FrameLayout;
+
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.views.PreferencesFragment;
 import org.fdroid.fdroid.views.updates.UpdatesViewBinder;
 
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.RecyclerView;
+
 /**
  * Decides which view on the main screen to attach to a given {@link FrameLayout}. This class
  * doesn't know which view it will be rendering at the time it is constructed. Rather, at some
@@ -30,10 +32,10 @@ class MainViewController extends RecyclerView.ViewHolder {
     }
 
     /**
-     * @see WhatsNewViewBinder
+     * @see LatestViewBinder
      */
-    public void bindWhatsNewView() {
-        new WhatsNewViewBinder(activity, frame);
+    public void bindLatestView() {
+        new LatestViewBinder(activity, frame);
     }
 
     /**

app/src/full/java/org/fdroid/fdroid/views/main/NearbyViewBinder.java

@@ -1,7 +1,6 @@
 package org.fdroid.fdroid.views.main;
 
 import android.Manifest;
-import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.content.UriPermission;
@@ -13,9 +12,7 @@ import android.os.Build;
 import android.os.Environment;
 import android.os.storage.StorageManager;
 import android.os.storage.StorageVolume;
-import android.support.annotation.RequiresApi;
-import android.support.v4.app.ActivityCompat;
-import android.support.v4.content.ContextCompat;
+import android.provider.DocumentsContract;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.View;
@@ -24,6 +21,7 @@ import android.widget.FrameLayout;
 import android.widget.ImageView;
 import android.widget.TextView;
 import android.widget.Toast;
+
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.Utils;
 import org.fdroid.fdroid.nearby.SDCardScannerService;
@@ -33,6 +31,11 @@ import org.fdroid.fdroid.nearby.TreeUriScannerIntentService;
 import java.io.File;
 import java.util.List;
 
+import androidx.annotation.RequiresApi;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+
 /**
  * A splash screen encouraging people to start the swap process. The swap
  * process is quite heavy duty in that it fires up Bluetooth and/or WiFi
@@ -59,6 +62,8 @@ import java.util.List;
  *
  * @see TreeUriScannerIntentService
  * @see org.fdroid.fdroid.nearby.SDCardScannerService
+ * <p>
+ * TODO use {@link StorageManager#registerStorageVolumeCallback(Executor, StorageManager.StorageVolumeCallback)}
  */
 public class NearbyViewBinder {
     public static final String TAG = "NearbyViewBinder";
@@ -66,7 +71,7 @@ public class NearbyViewBinder {
     private static File externalStorage = null;
     private static View swapView;
 
-    NearbyViewBinder(final Activity activity, FrameLayout parent) {
+    NearbyViewBinder(final AppCompatActivity activity, FrameLayout parent) {
         swapView = activity.getLayoutInflater().inflate(R.layout.main_tab_swap, parent, true);
 
         TextView subtext = swapView.findViewById(R.id.both_parties_need_fdroid_text);
@@ -86,7 +91,7 @@ public class NearbyViewBinder {
                     ActivityCompat.requestPermissions(activity, new String[]{coarseLocation},
                             MainActivity.REQUEST_LOCATION_PERMISSIONS);
                 } else {
-                    SwapService.start(activity);
+                    ContextCompat.startForegroundService(activity, new Intent(activity, SwapService.class));
                 }
             }
         });
@@ -146,7 +151,7 @@ public class NearbyViewBinder {
         updateUsbOtg(activity);
     }
 
-    public static void updateUsbOtg(final Activity activity) {
+    public static void updateUsbOtg(final Context context) {
         if (Build.VERSION.SDK_INT < 24) {
             return;
         }
@@ -159,24 +164,39 @@ public class NearbyViewBinder {
         storageVolumeText.setVisibility(View.GONE);
         requestStorageVolume.setVisibility(View.GONE);
 
-        final StorageManager storageManager = (StorageManager) activity.getSystemService(Context.STORAGE_SERVICE);
+        final StorageManager storageManager = ContextCompat.getSystemService(context, StorageManager.class);
         for (final StorageVolume storageVolume : storageManager.getStorageVolumes()) {
             if (storageVolume.isRemovable() && !storageVolume.isPrimary()) {
                 Log.i(TAG, "StorageVolume: " + storageVolume);
-                final Intent intent = storageVolume.createAccessIntent(null);
-                if (intent == null) {
+                Intent tmpIntent = null;
+                if (Build.VERSION.SDK_INT < 29) {
+                    tmpIntent = storageVolume.createAccessIntent(null);
+                } else {
+                    tmpIntent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
+                    tmpIntent.putExtra(DocumentsContract.EXTRA_INITIAL_URI,
+                            Uri.parse("content://"
+                                    + TreeUriScannerIntentService.EXTERNAL_STORAGE_PROVIDER_AUTHORITY
+                                    + "/tree/"
+                                    + storageVolume.getUuid()
+                                    + "%3A/document/"
+                                    + storageVolume.getUuid()
+                                    + "%3A"));
+                }
+                if (tmpIntent == null) {
                     Utils.debugLog(TAG, "Got null Storage Volume access Intent");
                     return;
                 }
+                final Intent intent = tmpIntent;
+
                 storageVolumeText.setVisibility(View.VISIBLE);
 
-                String text = storageVolume.getDescription(activity);
+                String text = storageVolume.getDescription(context);
                 if (!TextUtils.isEmpty(text)) {
                     requestStorageVolume.setText(text);
                     UsbDevice usb = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
                     if (usb != null) {
                         text = String.format("%s (%s %s)", text, usb.getManufacturerName(), usb.getProductName());
-                        Toast.makeText(activity, text, Toast.LENGTH_LONG).show();
+                        Toast.makeText(context, text, Toast.LENGTH_LONG).show();
                     }
                 }
 
@@ -185,16 +205,32 @@ public class NearbyViewBinder {
                     @Override
                     @RequiresApi(api = 24)
                     public void onClick(View v) {
-                        List<UriPermission> list = activity.getContentResolver().getPersistedUriPermissions();
+                        List<UriPermission> list = context.getContentResolver().getPersistedUriPermissions();
                         if (list != null) for (UriPermission uriPermission : list) {
                             Uri uri = uriPermission.getUri();
                             if (uri.getPath().equals(String.format("/tree/%s:", storageVolume.getUuid()))) {
                                 intent.setData(uri);
-                                TreeUriScannerIntentService.onActivityResult(activity, intent);
+                                TreeUriScannerIntentService.onActivityResult(context, intent);
                                 return;
                             }
                         }
-                        activity.startActivityForResult(intent, MainActivity.REQUEST_STORAGE_ACCESS);
+
+                        AppCompatActivity activity = null;
+                        if (context instanceof AppCompatActivity) {
+                            activity = (AppCompatActivity) context;
+                        } else if (swapView != null && swapView.getContext() instanceof AppCompatActivity) {
+                            activity = (AppCompatActivity) swapView.getContext();
+                        }
+
+                        if (activity != null) {
+                            activity.startActivityForResult(intent, MainActivity.REQUEST_STORAGE_ACCESS);
+                        } else {
+                            // scan in the background without requesting permissions
+                            Toast.makeText(context.getApplicationContext(),
+                                    context.getString(R.string.scan_removable_storage_toast, externalStorage),
+                                    Toast.LENGTH_SHORT).show();
+                            SDCardScannerService.scan(context);
+                        }
                     }
                 });
             }