Merge branch 'app-hiding' into 'master'

Implement App Hiding

See merge request fdroid/fdroidclient!629

app/src/main/AndroidManifest.xml

@@ -279,6 +279,8 @@
             android:name=".AppUpdateStatusService"
             android:exported="false" />
 
+        <!-- Warning: Please add all new services to HidingManager -->
+
         <activity
             android:name=".views.main.MainActivity"
             android:launchMode="singleTop"
@@ -552,6 +554,18 @@
             android:name=".views.panic.ExitActivity"
             android:theme="@android:style/Theme.NoDisplay"/>
 
+        <activity
+            android:name=".views.hiding.CalculatorActivity"
+            android:enabled="false"
+            android:icon="@mipmap/ic_calculator_launcher"
+            android:label="@string/hiding_calculator"
+            android:theme="@style/AppThemeLight">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
     </application>
 
 </manifest>

app/src/main/java/org/fdroid/fdroid/FDroidApp.java

@@ -62,6 +62,7 @@ import org.fdroid.fdroid.installer.ApkFileProvider;
 import org.fdroid.fdroid.installer.InstallHistoryService;
 import org.fdroid.fdroid.net.ImageLoaderForUIL;
 import org.fdroid.fdroid.net.WifiStateChangeService;
+import org.fdroid.fdroid.views.hiding.HidingManager;
 
 import java.io.IOException;
 import java.net.URL;
@@ -286,7 +287,7 @@ public class FDroidApp extends Application {
         Languages.setLanguage(this);
 
         ACRA.init(this);
-        if (isAcraProcess()) {
+        if (isAcraProcess() || HidingManager.isHidden(this)) {
             return;
         }
 

app/src/main/java/org/fdroid/fdroid/Preferences.java

@@ -42,6 +42,7 @@ public final class Preferences implements SharedPreferences.OnSharedPreferenceCh
         Resources res = context.getResources();
         defaultPreventScreenshots = res.getBoolean(R.bool.defaultPreventScreenshots);
         defaultPanicExit = res.getBoolean(R.bool.defaultPanicExit);
+        defaultHideOnLongPressSearch = res.getBoolean(R.bool.defaultHideOnLongPressSearch);
     }
 
     public static final String PREF_UPD_INTERVAL = "updateInterval";
@@ -73,6 +74,7 @@ public final class Preferences implements SharedPreferences.OnSharedPreferenceCh
     public static final String PREF_PREVENT_SCREENSHOTS = "preventScreenshots";
     public static final String PREF_PANIC_EXIT = "pref_panic_exit";
     public static final String PREF_PANIC_HIDE = "pref_panic_hide";
+    public static final String PREF_HIDE_ON_LONG_PRESS_SEARCH = "hideOnLongPressSearch";
 
     private static final boolean DEFAULT_ROOTED = true;
     private static final boolean DEFAULT_HIDE_ANTI_FEATURE_APPS = false;
@@ -94,6 +96,7 @@ public final class Preferences implements SharedPreferences.OnSharedPreferenceCh
     private static final boolean DEFAULT_POST_PRIVILEGED_INSTALL = false;
     private final boolean defaultPreventScreenshots;
     private final boolean defaultPanicExit;
+    private final boolean defaultHideOnLongPressSearch;
 
     public enum Theme {
         light,
@@ -335,6 +338,10 @@ public final class Preferences implements SharedPreferences.OnSharedPreferenceCh
         return preferences.getBoolean(PREF_PANIC_HIDE, false);
     }
 
+    public boolean hideOnLongPressSearch() {
+        return preferences.getBoolean(PREF_HIDE_ON_LONG_PRESS_SEARCH, defaultHideOnLongPressSearch);
+    }
+
     /**
      * This is cached as it is called several times inside app list adapters.
      * Providing it here means the shared preferences file only needs to be

app/src/main/java/org/fdroid/fdroid/installer/InstallManagerService.java

@@ -85,6 +85,8 @@ public class InstallManagerService extends Service {
 
     private LocalBroadcastManager localBroadcastManager;
     private AppUpdateStatusManager appUpdateStatusManager;
+    private BroadcastReceiver broadcastReceiver;
+    private boolean running = false;
 
     /**
      * This service does not use binding, so no need to implement this method
@@ -101,9 +103,10 @@ public class InstallManagerService extends Service {
         localBroadcastManager = LocalBroadcastManager.getInstance(this);
         appUpdateStatusManager = AppUpdateStatusManager.getInstance(this);
 
-        BroadcastReceiver br = new BroadcastReceiver() {
+        broadcastReceiver = new BroadcastReceiver() {
             @Override
             public void onReceive(Context context, Intent intent) {
+                if (intent.getData() == null) return;
                 String packageName = intent.getData().getSchemeSpecificPart();
                 for (AppUpdateStatusManager.AppUpdateStatus status : appUpdateStatusManager.getByPackageName(packageName)) {
                     appUpdateStatusManager.updateApk(status.getUniqueKey(), AppUpdateStatusManager.Status.Installed, null);
@@ -113,7 +116,15 @@ public class InstallManagerService extends Service {
         IntentFilter intentFilter = new IntentFilter();
         intentFilter.addAction(Intent.ACTION_PACKAGE_ADDED);
         intentFilter.addDataScheme("package");
-        registerReceiver(br, intentFilter);
+        registerReceiver(broadcastReceiver, intentFilter);
+        running = true;
+    }
+
+    @Override
+    public void onDestroy() {
+        running = false;
+        unregisterReceiver(broadcastReceiver);
+        super.onDestroy();
     }
 
     @Override
@@ -218,6 +229,10 @@ public class InstallManagerService extends Service {
         final BroadcastReceiver downloadReceiver = new BroadcastReceiver() {
             @Override
             public void onReceive(Context context, Intent intent) {
+                if (!running) {
+                    localBroadcastManager.unregisterReceiver(this);
+                    return;
+                }
                 String action = intent.getAction();
                 if (Downloader.ACTION_STARTED.equals(action)) {
                     Utils.debugLog(TAG, action + " " + intent);
@@ -273,6 +288,10 @@ public class InstallManagerService extends Service {
         BroadcastReceiver downloadReceiver = new BroadcastReceiver() {
             @Override
             public void onReceive(Context context, Intent intent) {
+                if (!running) {
+                    localBroadcastManager.unregisterReceiver(this);
+                    return;
+                }
                 Uri downloadUri = intent.getData();
                 String urlString = downloadUri.toString();
                 long repoId = intent.getLongExtra(Downloader.EXTRA_REPO_ID, 0);
@@ -351,6 +370,10 @@ public class InstallManagerService extends Service {
         BroadcastReceiver installReceiver = new BroadcastReceiver() {
             @Override
             public void onReceive(Context context, Intent intent) {
+                if (!running) {
+                    localBroadcastManager.unregisterReceiver(this);
+                    return;
+                }
                 String downloadUrl = intent.getDataString();
                 Apk apk;
                 switch (intent.getAction()) {

app/src/main/java/org/fdroid/fdroid/views/hiding/CalculatorActivity.java

@@ -0,0 +1,152 @@
+package org.fdroid.fdroid.views.hiding;
+
+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 org.fdroid.fdroid.R;
+
+import java.util.regex.Pattern;
+
+/**
+ * A very hacky calculator which is barely functional.
+ * It is just meant to pass a very casual inspection.
+ */
+public class CalculatorActivity extends AppCompatActivity {
+
+    // binary operators
+    private static final String TIMES = "×";
+    private static final String DIVIDED = "÷";
+    private static final String PLUS = "+";
+    private static final String MINUS = "-";
+
+    // unary operators
+    private static final String PERCENT = "%";
+
+    private @Nullable String lastOp;
+
+    // views
+    private TextView textView;
+
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_calculator);
+
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+
+        textView = (TextView) findViewById(R.id.textView);
+    }
+
+    public void ce(View view) {
+        // clear display
+        textView.setText(null);
+    }
+
+    public void c(View view) {
+        // clear last character
+        if (textView.length() > 0) {
+            String text = textView.getText().toString();
+            textView.setText(text.substring(0, text.length() - 1));
+        }
+    }
+
+    public void number(View view) {
+        String number = ((Button) view).getText().toString();
+        String newNumber = String.format("%s%s", textView.getText(), number);
+        // FIXME don't allow multiple commas
+        String pin = String.valueOf(HidingManager.getUnhidePin(this));
+        if (newNumber.equals(pin)) {
+            // correct PIN was entered, show app launcher again
+            HidingManager.show(this);
+        }
+        textView.setText(newNumber);
+    }
+
+    public void op(View view) {
+        String text = textView.getText().toString();
+
+        if (text.length() == 0) {
+            return;
+        } else if (containsBinaryOperator(String.valueOf(text.charAt(text.length() - 1)))) {
+            // last character was already binary operator, ignore
+            return;
+        }
+
+        String op = ((Button) view).getText().toString();
+        if (containsBinaryOperator(op)) {
+            // remember binary operator
+            lastOp = op;
+            // add binary operator to display
+            textView.setText(String.format("%s%s", text, op));
+        } else if (op.equals(PERCENT)) {
+            double result;
+            try {
+                result = Double.valueOf(eval(text));
+            } catch (NumberFormatException e) {
+                result = 0;
+            }
+            textView.setText(toString(result / 100));
+        } else if ("=".equals(op)) {
+            textView.setText(eval(text));
+        } else {
+            Toast.makeText(this, "Error: Unknown Operation", Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    private String eval(String s) {
+        if (lastOp != null && s.contains(lastOp)) {
+            // remember and reset binary operator
+            String op = lastOp;
+            lastOp = null;
+
+            // extract binary operation
+            String[] parts = s.split(Pattern.quote(op));
+            double left;
+            double right;
+            try {
+                left = Double.valueOf(parts[0]);
+                right = Double.valueOf(parts[1]);
+            } catch (NumberFormatException e) {
+                return "";
+            }
+
+            // evaluate binary operation
+            switch (op) {
+                case PLUS:
+                    return toString(left + right);
+                case MINUS:
+                    return toString(left - right);
+                case TIMES:
+                    return toString(left * right);
+                case DIVIDED:
+                    if (right == 0) return "";
+                    return toString(left / right);
+                default:
+                    Toast.makeText(this, "Error: Unknown Operation", Toast.LENGTH_SHORT).show();
+                    return s;
+            }
+        } else {
+            return s;
+        }
+    }
+
+    private boolean containsBinaryOperator(String s) {
+        return s.contains(TIMES) || s.contains(DIVIDED) || s.contains(PLUS) || s.contains(MINUS);
+    }
+
+    private String toString(double d) {
+        String s = String.valueOf(d);
+        if (s.length() > 2 && s.endsWith(".0")) {
+            return s.substring(0, s.length() - 2);
+        }
+        return s;
+    }
+
+}

app/src/main/java/org/fdroid/fdroid/views/hiding/HidingManager.java

@@ -0,0 +1,123 @@
+package org.fdroid.fdroid.views.hiding;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.support.v4.app.NotificationManagerCompat;
+import android.support.v7.app.AlertDialog;
+
+import org.fdroid.fdroid.AppUpdateStatusService;
+import org.fdroid.fdroid.BuildConfig;
+import org.fdroid.fdroid.CleanCacheService;
+import org.fdroid.fdroid.R;
+import org.fdroid.fdroid.UpdateService;
+import org.fdroid.fdroid.data.InstalledAppProviderService;
+import org.fdroid.fdroid.installer.InstallHistoryService;
+import org.fdroid.fdroid.installer.InstallManagerService;
+import org.fdroid.fdroid.installer.InstallerService;
+import org.fdroid.fdroid.localrepo.CacheSwapAppsService;
+import org.fdroid.fdroid.localrepo.SwapService;
+import org.fdroid.fdroid.net.DownloaderService;
+import org.fdroid.fdroid.net.WifiStateChangeService;
+import org.fdroid.fdroid.views.main.MainActivity;
+
+/**
+ * This class is encapsulating all methods related to hiding the app from the launcher
+ * and restoring it.
+ *
+ * It can tell you whether the app is hidden, what the PIN to restore is
+ * and show confirmation dialogs before hiding.
+ */
+public class HidingManager {
+
+    private static final ComponentName LAUNCHER_NAME =
+            new ComponentName(BuildConfig.APPLICATION_ID, MainActivity.class.getName());
+
+    private static final ComponentName CALCULATOR_NAME =
+            new ComponentName(BuildConfig.APPLICATION_ID, CalculatorActivity.class.getName());
+
+    public static int getUnhidePin(Context context) {
+        return context.getResources().getInteger(R.integer.unhidePin);
+    }
+
+    public static boolean isHidden(Context context) {
+        PackageManager pm = context.getPackageManager();
+        int state = pm.getComponentEnabledSetting(LAUNCHER_NAME);
+        return state == PackageManager.COMPONENT_ENABLED_STATE_DISABLED;
+    }
+
+    public static void showHideDialog(final Context context) {
+        String appName = context.getString(R.string.app_name);
+        AlertDialog.Builder builder = new AlertDialog.Builder(context);
+        builder.setTitle(context.getString(R.string.hiding_dialog_title, appName));
+        builder.setMessage(context.getString(R.string.hiding_dialog_message, appName,
+                HidingManager.getUnhidePin(context), context.getString(R.string.hiding_calculator)));
+        builder.setPositiveButton(context.getString(R.string.panic_hide_title, appName),
+                new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        hide(context);
+                    }
+                });
+        builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialogInterface, int i) {
+                dialogInterface.cancel();
+            }
+        });
+        builder.setView(R.layout.dialog_app_hiding);
+        builder.create().show();
+    }
+
+    public static void hide(Context context) {
+        stopServices(context);
+        removeNotifications(context);
+
+        PackageManager pm = context.getPackageManager();
+        // hide launcher icon
+        pm.setComponentEnabledSetting(LAUNCHER_NAME,
+                PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
+                PackageManager.DONT_KILL_APP);
+        // show calculator icon
+        pm.setComponentEnabledSetting(CALCULATOR_NAME,
+                PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
+                0); // please kill app (faster and safer, because it also stops services)
+    }
+
+    public static void show(Context context) {
+        PackageManager pm = context.getPackageManager();
+        // show launcher icon
+        pm.setComponentEnabledSetting(LAUNCHER_NAME,
+                PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
+                PackageManager.DONT_KILL_APP);
+        // hide calculator icon
+        pm.setComponentEnabledSetting(CALCULATOR_NAME,
+                PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
+                0); // please kill app (faster)
+    }
+
+    private static void removeNotifications(Context context) {
+        NotificationManagerCompat nm = NotificationManagerCompat.from(context);
+        nm.cancelAll();
+    }
+
+    /**
+     * Stops all running services, so nothing can pop up and reveal F-Droid's existence on the system
+     */
+    private static void stopServices(Context context) {
+        context.stopService(new Intent(context, UpdateService.class));
+        context.stopService(new Intent(context, DownloaderService.class));
+        context.stopService(new Intent(context, InstallerService.class));
+        context.stopService(new Intent(context, CleanCacheService.class));
+        context.stopService(new Intent(context, WifiStateChangeService.class));
+        context.stopService(new Intent(context, SwapService.class));
+        context.stopService(new Intent(context, InstallManagerService.class));
+        context.stopService(new Intent(context, InstallHistoryService.class));
+        context.stopService(new Intent(context, CacheSwapAppsService.class));
+        context.stopService(new Intent(context, InstalledAppProviderService.class));
+        context.stopService(new Intent(context, AppUpdateStatusService.class));
+    }
+
+}

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

@@ -15,6 +15,7 @@ import android.view.View;
 import android.widget.FrameLayout;
 import android.widget.TextView;
 
+import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.UpdateService;
 import org.fdroid.fdroid.data.CategoryProvider;
@@ -22,6 +23,7 @@ import org.fdroid.fdroid.data.Schema;
 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.views.hiding.HidingManager;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -73,6 +75,17 @@ class CategoriesViewBinder implements LoaderManager.LoaderCallbacks<Cursor> {
                 activity.startActivity(new Intent(activity, AppListActivity.class));
             }
         });
+        searchFab.setOnLongClickListener(new View.OnLongClickListener() {
+            @Override
+            public boolean onLongClick(View view) {
+                if (Preferences.get().hideOnLongPressSearch()) {
+                    HidingManager.showHideDialog(activity);
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+        });
 
         activity.getSupportLoaderManager().restartLoader(LOADER_ID, null, this);
     }

app/src/main/java/org/fdroid/fdroid/views/main/WhatsNewViewBinder.java

@@ -14,6 +14,8 @@ import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.widget.FrameLayout;
 import android.widget.TextView;
+
+import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.R;
 import org.fdroid.fdroid.UpdateService;
 import org.fdroid.fdroid.Utils;
@@ -21,6 +23,7 @@ import org.fdroid.fdroid.data.AppProvider;
 import org.fdroid.fdroid.data.RepoProvider;
 import org.fdroid.fdroid.data.Schema;
 import org.fdroid.fdroid.views.apps.AppListActivity;
+import org.fdroid.fdroid.views.hiding.HidingManager;
 import org.fdroid.fdroid.views.whatsnew.WhatsNewAdapter;
 
 import java.util.Date;
@@ -71,6 +74,17 @@ class WhatsNewViewBinder implements LoaderManager.LoaderCallbacks<Cursor> {
                 activity.startActivity(new Intent(activity, AppListActivity.class));
             }
         });
+        searchFab.setOnLongClickListener(new View.OnLongClickListener() {
+            @Override
+            public boolean onLongClick(View view) {
+                if (Preferences.get().hideOnLongPressSearch()) {
+                    HidingManager.showHideDialog(activity);
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+        });
 
         activity.getSupportLoaderManager().initLoader(LOADER_ID, null, this);
     }

app/src/main/java/org/fdroid/fdroid/views/panic/PanicPreferencesFragment.java

@@ -13,7 +13,6 @@ import android.os.Bundle;
 import android.preference.CheckBoxPreference;
 import android.preference.ListPreference;
 import android.preference.Preference;
-import android.preference.PreferenceCategory;
 import android.support.annotation.Nullable;
 import android.support.v4.preference.PreferenceFragment;
 import android.support.v7.app.AlertDialog;
@@ -21,6 +20,7 @@ import android.text.TextUtils;
 
 import org.fdroid.fdroid.Preferences;
 import org.fdroid.fdroid.R;
+import org.fdroid.fdroid.views.hiding.HidingManager;
 
 import java.util.ArrayList;
 
@@ -79,10 +79,6 @@ public class PanicPreferencesFragment extends PreferenceFragment implements Shar
                 return true;
             }
         });
-
-        // TODO implement app hiding
-        PreferenceCategory category = (PreferenceCategory) findPreference("pref_panic_destructive_actions");
-        category.removePreference(prefHide);
     }
 
     @Override
@@ -100,9 +96,8 @@ public class PanicPreferencesFragment extends PreferenceFragment implements Shar
 
     @Override
     public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
-        // enable "exit" if "hiding" gets enabled
         if (key.equals(PREF_HIDE) && sharedPreferences.getBoolean(PREF_HIDE, false)) {
-            prefExit.setChecked(true);
+            showHideConfirmationDialog();
         }
         // disable "hiding" if "exit" gets disabled
         if (key.equals(PREF_EXIT) && !sharedPreferences.getBoolean(PREF_EXIT, true)) {
@@ -217,4 +212,35 @@ public class PanicPreferencesFragment extends PreferenceFragment implements Shar
         return packageName;
     }
 
+    private void showHideConfirmationDialog() {
+        String appName = getString(R.string.app_name);
+        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
+        builder.setTitle(R.string.panic_hide_warning_title);
+        builder.setMessage(getString(R.string.panic_hide_warning_message, appName,
+                HidingManager.getUnhidePin(getContext()), getString(R.string.hiding_calculator)));
+        builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialogInterface, int i) {
+                // enable "exit" if "hiding" gets enabled
+                prefExit.setChecked(true);
+                // dismiss, but not cancel dialog
+                dialogInterface.dismiss();
+            }
+        });
+        builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialogInterface, int i) {
+                dialogInterface.cancel();
+            }
+        });
+        builder.setOnCancelListener(new DialogInterface.OnCancelListener() {
+            @Override
+            public void onCancel(DialogInterface dialogInterface) {
+                prefHide.setChecked(false);
+            }
+        });
+        builder.setView(R.layout.dialog_app_hiding);
+        builder.create().show();
+    }
+
 }

app/src/main/java/org/fdroid/fdroid/views/panic/PanicResponderActivity.java

@@ -7,6 +7,7 @@ import android.support.v7.app.AppCompatActivity;
 import android.util.Log;
 
 import org.fdroid.fdroid.Preferences;
+import org.fdroid.fdroid.views.hiding.HidingManager;
 
 import info.guardianproject.panic.Panic;
 import info.guardianproject.panic.PanicResponder;
@@ -36,7 +37,7 @@ public class PanicResponderActivity extends AppCompatActivity {
             // Performing destructive panic responses
             if (preferences.panicHide()) {
                 Log.i(TAG, "Hiding app...");
-                // TODO
+                HidingManager.hide(this);
             }
         }
 

app/src/main/res/layout/activity_calculator.xml

@@ -0,0 +1,292 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".views.hiding.CalculatorActivity">
+
+    <android.support.v7.widget.Toolbar
+        android:id="@+id/toolbar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:popupTheme="?attr/actionBarPopupTheme"
+        app:theme="?attr/actionBarTheme" />
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginTop="8dp"
+        android:gravity="bottom|end"
+        android:padding="5dp"
+        android:textAlignment="textEnd"
+        android:textSize="22sp"
+        android:typeface="monospace"
+        app:layout_constraintBottom_toTopOf="@+id/ce"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/toolbar"
+        tools:text="1337+42" />
+
+    <Button
+        android:id="@+id/times"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="op"
+        android:text="×"
+        app:layout_constraintBottom_toTopOf="@+id/seven"
+        app:layout_constraintStart_toStartOf="parent"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/divided"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="op"
+        android:text="÷"
+        app:layout_constraintBottom_toTopOf="@+id/eight"
+        app:layout_constraintStart_toEndOf="@+id/times"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/c"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="c"
+        android:text="C"
+        app:layout_constraintBottom_toTopOf="@+id/nine"
+        app:layout_constraintStart_toEndOf="@+id/divided"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/seven"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="number"
+        android:text="7"
+        app:layout_constraintBottom_toTopOf="@+id/four"
+        app:layout_constraintStart_toStartOf="parent"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/eight"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="number"
+        android:text="8"
+        app:layout_constraintBottom_toTopOf="@+id/five"
+        app:layout_constraintStart_toEndOf="@+id/seven"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/nine"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="number"
+        android:text="9"
+        app:layout_constraintBottom_toTopOf="@+id/six"
+        app:layout_constraintStart_toEndOf="@+id/eight"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/ce"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="ce"
+        android:text="CE"
+        app:layout_constraintBottom_toTopOf="@+id/plus"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/nine"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/four"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="number"
+        android:text="4"
+        app:layout_constraintBottom_toTopOf="@+id/one"
+        app:layout_constraintStart_toStartOf="parent"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/five"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="number"
+        android:text="5"
+        app:layout_constraintBottom_toTopOf="@+id/two"
+        app:layout_constraintStart_toEndOf="@+id/four"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/six"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="number"
+        android:text="6"
+        app:layout_constraintBottom_toTopOf="@+id/three"
+        app:layout_constraintStart_toEndOf="@+id/five"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/plus"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="op"
+        android:text="+"
+        app:layout_constraintBottom_toTopOf="@+id/minus"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/six"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/minus"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="op"
+        android:text="-"
+        app:layout_constraintBottom_toTopOf="@+id/equals"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/three"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/one"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="number"
+        android:text="1"
+        app:layout_constraintBottom_toTopOf="@+id/zero"
+        app:layout_constraintStart_toStartOf="parent"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/two"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="number"
+        android:text="2"
+        app:layout_constraintBottom_toTopOf="@+id/comma"
+        app:layout_constraintStart_toEndOf="@+id/one"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/three"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="number"
+        android:text="3"
+        app:layout_constraintBottom_toTopOf="@+id/percent"
+        app:layout_constraintStart_toEndOf="@+id/two"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/zero"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="number"
+        android:text="0"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/comma"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="number"
+        android:text="."
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/zero"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/percent"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="op"
+        android:text="%"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/comma"
+        tools:ignore="HardcodedText" />
+
+    <Button
+        android:id="@+id/equals"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        android:onClick="op"
+        android:text="="
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.0"
+        app:layout_constraintStart_toEndOf="@+id/three"
+        app:layout_constraintTop_toTopOf="@+id/three"
+        tools:ignore="HardcodedText" />
+
+</android.support.constraint.ConstraintLayout>

app/src/main/res/layout/dialog_app_hiding.xml

@@ -0,0 +1,60 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <ImageView
+        android:id="@+id/launcherIcon"
+        android:layout_width="48dp"
+        android:layout_height="48dp"
+        android:layout_marginLeft="24dp"
+        android:layout_marginStart="24dp"
+        android:layout_marginTop="16dp"
+        android:contentDescription="@string/hiding_calculator"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:srcCompat="@mipmap/ic_calculator_launcher" />
+
+    <TextView
+        android:id="@+id/appName"
+        android:layout_width="wrap_content"
+        android:layout_height="0dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginStart="8dp"
+        android:gravity="center_vertical"
+        android:text="@string/hiding_calculator"
+        android:textSize="18sp"
+        app:layout_constraintBottom_toBottomOf="@+id/launcherIcon"
+        app:layout_constraintStart_toEndOf="@+id/launcherIcon"
+        app:layout_constraintTop_toTopOf="@+id/launcherIcon" />
+
+    <TextView
+        android:id="@+id/pin"
+        android:layout_width="wrap_content"
+        android:layout_height="0dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        android:gravity="center_vertical"
+        android:text="@integer/unhidePin"
+        android:textColor="@color/red"
+        android:textSize="18sp"
+        app:layout_constraintBottom_toBottomOf="@+id/launcherIcon"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/appName"
+        app:layout_constraintTop_toTopOf="@+id/launcherIcon" />
+
+    <TextView
+        android:id="@+id/warningText"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="8dp"
+        android:layout_marginRight="8dp"
+        android:layout_marginTop="8dp"
+        android:text="@string/hiding_dialog_warning"
+        android:textColor="?android:textColorPrimary"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="@+id/launcherIcon"
+        app:layout_constraintTop_toBottomOf="@+id/launcherIcon" />
+
+</android.support.constraint.ConstraintLayout>

app/src/main/res/values/attrs.xml

@@ -17,5 +17,8 @@
     <!-- Default Preferences -->
     <bool name="defaultPreventScreenshots">false</bool>
     <bool name="defaultPanicExit">true</bool>
+    <bool name="defaultHideOnLongPressSearch">false</bool>
+
+    <integer name="unhidePin">1337</integer>
 
 </resources>

app/src/main/res/values/strings.xml

@@ -259,6 +259,15 @@ This often occurs with apps installed via Google Play or other sources, if they
     <string name="panic_destructive_actions">Destructive Actions</string>
     <string name="panic_hide_title">Hide %s</string>
     <string name="panic_hide_summary">App will hide itself</string>
+    <string name="panic_hide_warning_title">Remember how to restore</string>
+    <string name="panic_hide_warning_message">In a panic event, this will remove %1$s from the launcher. Only typing \"%2$d\" in the fake %3$s app can restore it.</string>
+
+    <string name="hiding_calculator">Calculator</string>
+    <string name="hiding_dialog_title">Hide %s Now</string>
+    <string name="hiding_dialog_message">Are you sure you want to remove %1$s from the launcher? Only typing \"%2$d\" in the fake %3$s app can restore it.</string>
+    <string name="hiding_dialog_warning">Warning: Any app shortcut on the home screen will also be removed and needs to be re-added manually.</string>
+    <string name="hide_on_long_search_press_title">Hide with search button</string>
+    <string name="hide_on_long_search_press_summary">Long pressing the search button will hide the app</string>
 
     <!--
     status_download takes four parameters:

app/src/main/res/xml/preferences.xml

@@ -100,6 +100,12 @@
             android:summary="@string/preventScreenshots_summary"
             android:title="@string/preventScreenshots_title"/>
 
+        <CheckBoxPreference
+            android:defaultValue="@bool/defaultHideOnLongPressSearch"
+            android:key="hideOnLongPressSearch"
+            android:summary="@string/hide_on_long_search_press_summary"
+            android:title="@string/hide_on_long_search_press_title"/>
+
         <PreferenceScreen
             android:summary="@string/panic_settings_summary"
             android:title="@string/panic_settings">