Now that we controll all lib build.gradle files, we can finally do it.
If we want to build support-v7 from source again with gradle, we'll import the
build.gradle and "fix" it like the rest.
The support libraries expect to be using the gradle plugin version 0.10.0.
We are currently on version 1.0.0. They use APIs in their build script which
have moved or been removed, and so the build just breaks when we run it with
the 1.0.0 plugin. I tried some magic to make it work in various ways, but
kept failing. As such, I've reverted the `gradle -PsourceDeps` build to not
build the support libraries from source. In the future, we should be able to
change this if they change the plugin version to a more recent one.
Note that the ant build script still hasn't been modified, and so will be
using the binary support-v4 library, but should build appcompat-v7 from source.
Was going to bump to Support v21, however there is some behaviour change which
causes a crash. They have removed the progress view from the toolbar/actionbar.
This breaks the AppDetails activity. As such, I'll leave that for the future.
For now, there will be a slight difference between building with
ant (which uses support v-almost-21) and gradle (which uses v20).
This will stay the case until we get around to completely porting
the app to v21, and fixing any bugs or UI sadness that arises.
NOTE: This commit does not touch the ant build system at all,
only gradle.
There are currently 23 gradle projects which require configuration,
let alone building, in order to build F-Droid. This takes a non-trivial
amount of time/memory/cpu. Additionally, it also provides difficulties
when importing the project into Android Studio - which is the IDE that
many potential contributors will be using. Finally, I have over 100mb
of data in the extern/ folder, and the support libraries require almost
every single Android SDK to be installed, which is several GB. This is
not a friendly environment to encourage people to submit merge requests.
However, I'm very mindful of the need for an open source project such
as F-Droid to be able to be built from source. So to make sure we have
the best of both worlds, I've ensured that building all dependencies
from source is still possible.
The F-Droid/libs/README.md file explains in greater detail how to
do this (i.e. "gradle -PsourceDeps build").
As much as possible, I've tried to make the binary dependencies fetched
from jcenter. However there are still libraries which either haven't
integrated required changes for F-Droid back upstream, or don't have
mavenCentral/jcenter binaries available.
Android preference fragment has been changed to the original
upstream repository. The one we had before was because upstream
hadn't merged a MR for gradfle support yet. However, that has
now been merged. This version still doesn't exist in jcenter though.
In order for libsuperuser to build from upstream, using
`gradle -PsourceDeps`, we need to include a few gradle plugins
from jcenter which are never actually used (used by upstream to
release to jcenter).
Even though support-v4 is included through jcenter, it is kept in
the libs directory, so that ./ant-prepare.sh can use it.
Update support preference fragment to newer version. There has been
bugfixes commited, so lets include them in the version we are using.
* Don't apply android plugin in root project
This results in the root project being treated like and Android project.
That is, gradle will expect an AndroidManifest, a targetSdk property, and
all sorts of stuff that is not relevant to the root project.
Perhaps more importantly, this breaks integration with Android Studio,
which is the tool that many potential contributors will be using.
Finally, it also allows runing gradle tasks in the root project, rather
than having to cd into the F-Droid directory, which is a minor nicety.
The reason it was there in the first place was to make it so that we could
find the location of the Android SDK using the same mechanism that the
plugin used. To deal with this, this commit adapts the SDK finding code
from the gradle plugin.
* Make gradle error out when missing depenencies.
The support v4 library requires some obsolte SDKs that are likely
not installed. It caused non-intuitive errors to come up for me,
so I've made gradle tell the user when this occurs.
* Documented the main build.gradle file
This is primarily to explain the hacks we use in order to build the
Android support libraries.
The specific reason for this is that it provides @Null and @NotNull
annotations which should increase the safety of our code. Many of the
bugs which get filed are due to NullPointerExceptions, which could be
avoided by tooling using these annotations. The goal is to statically
catch this specific class of errors in as many situations as possible,
rather than waiting for them to occur at runtime.
Taken from the gradle plugin user guide:
With Android KitKat (buildToolsVersion 19) you can use the diamond operator,
multi-catch, strings in switches, try with resources, etc.
Note that you can use minSdkVersion with a value earlier than 19, for all
language features except try with resources. If you want to use try with
resources, you will need to also use a minSdkVersion of 19.
You also need to make sure that Gradle is using version 1.7 or later of the
JDK. (And version 0.6.1 or later of the Android Gradle plugin.)
Both preferencefragment and appcompat-v7 submodules need the
android-support-v4.jar to be included in their respective libs/ dirs in
order for ant to build those projects.
NOTE: I don't know how android will go with adding a new property
to a string-array resource, but not having it translated everywhere.
Will it struggle because the EN version has three values for "theme",
but other translations only have two?
Although Google is encouraging people to make old devices run apps
with the action bar (via appcompat-v7), they haven't provided a way
for people to create preference/setting screens with an action bar.
There are plenty of issues in the Android issue tracker relating
to this, but it doesn't yet seem to be on the radar of the Android
devs.
Until there is a native implementation of PreferenceFragment in
the appcompat-v7 support library, this submodule provides is a 3rd
party solution. It is actually a fork of the first repo in github,
though that was a bit of an upload and dump, without accepting MR's.
This fork includes gradle support.
Thanks to the awesome work of mvdan, this was mostly ready to roll.
However, I had to wrestle for a while for two reasons:
1) I forgot to add the dependency in the build.gradle file (it was
already present in settings.gradle)
2) My IDE was unable to read the ANDROID_HOME env variable, and
despite my internet-search-fu, I couldn't figure out how to
make IntelliJ specify env variables for a gradle build. It took
a while to figure out, because it was failing silently in weird
ways.
After slaving away on a nice method to parse both the ANDROID_HOME
and the local.properties file (looking for sdk.dir), and then emmiting
nice error messages if neither were found or pointed to an invalid
location, I discovered it had already be done:
android.plugin.sdkDirectory ends up here:
https://android.googlesource.com/platform/tools/build/+/master/gradle/src/main/groovy/com/android/build/gradle/internal/Sdk.groovy#161
Which does exactly all that and more. So now sdkLoc is initialized to
the value of android.plugin.sdkDirectory.
