sanders: KeyHandler: Add last app action

LineageActions/res/values-pt-rBR/strings.xml

@@ -54,6 +54,7 @@
     <string name="action_wake">Acordar o dispositivo</string>
     <string name="action_back">Voltar</string>
     <string name="action_recents">Recentes</string>
+    <string name="action_last_app">Último app</string>
     <string name="action_volume_up">Aumentar volume</string>
     <string name="action_volume_down">Diminuir volume</string>
     <string name="action_voice_assistant">Assistente de voz</string>

LineageActions/res/values/array.xml

@@ -21,6 +21,7 @@
         <item>@string/action_power</item>
         <item>@string/action_back</item>
         <item>@string/action_recents</item>
+        <item>@string/action_last_app</item>
         <item>@string/action_volume_up</item>
         <item>@string/action_volume_down</item>
         <item>@string/action_voice_assistant</item>
@@ -38,6 +39,7 @@
         <item>101</item> <!-- power -->
         <item>102</item> <!-- back -->
         <item>103</item> <!-- recents -->
+        <item>121</item> <!-- last app -->
         <item>104</item> <!-- volume up -->
         <item>105</item> <!-- volume down -->
         <item>106</item> <!-- voice assistant -->

LineageActions/res/values/strings.xml

@@ -54,6 +54,7 @@
     <string name="action_wake">Wake</string>
     <string name="action_back">Back</string>
     <string name="action_recents">Recents</string>
+    <string name="action_last_app">Last app</string>
     <string name="action_volume_up">Volume up</string>
     <string name="action_volume_down">Volume down</string>
     <string name="action_voice_assistant">Voice assistant</string>

LineageActions/src/org/lineageos/settings/device/KeyHandler.java

@@ -217,6 +217,40 @@ public class KeyHandler implements DeviceKeyHandler {
         }
     }
 
+    private static void switchToLastApp(Context context) {
+        final ActivityManager am =
+                (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        ActivityManager.RunningTaskInfo lastTask = getLastTask(context, am);
+
+        if (lastTask != null) {
+            am.moveTaskToFront(lastTask.id, ActivityManager.MOVE_TASK_NO_USER_ACTION);
+        }
+    }
+
+    private static ActivityManager.RunningTaskInfo getLastTask(Context context,
+                                                               final ActivityManager am) {
+        final String defaultHomePackage = resolveCurrentLauncherPackage(context);
+        List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks(5);
+
+        for (int i = 1; i < tasks.size(); i++) {
+            String packageName = tasks.get(i).topActivity.getPackageName();
+            if (!packageName.equals(defaultHomePackage)
+                    && !packageName.equals(context.getPackageName())
+                    && !packageName.equals("com.android.systemui")) {
+                return tasks.get(i);
+            }
+        }
+        return null;
+    }
+
+    private static String resolveCurrentLauncherPackage(Context context) {
+        final Intent launcherIntent = new Intent(Intent.ACTION_MAIN)
+                .addCategory(Intent.CATEGORY_HOME);
+        final PackageManager pm = context.getPackageManager();
+        final ResolveInfo launcherInfo = pm.resolveActivity(launcherIntent, 0);
+        return launcherInfo.activityInfo.packageName;
+    }
+
     private void setHapticFeedbackEnabledOnSystem(boolean enabled) {
         Settings.System.putIntForUser(mContext.getContentResolver(),
                 Settings.System.HAPTIC_FEEDBACK_ENABLED, enabled ? 1 : 0, UserHandle.USER_CURRENT);
@@ -565,6 +599,11 @@ public class KeyHandler implements DeviceKeyHandler {
                     goToPipMode();
                 }
                 break;
+            case ACTION_LAST_APP:
+                if (!mKeyguardManager.inKeyguardRestrictedInputMode()) {
+                    switchToLastApp(mContext);
+                }
+                break;
         }
         if (isHapticFeedbackEnabledOnFP && action != ACTION_VOICE_ASSISTANT && action != ACTION_CAMERA && action != ACTION_FLASHLIGHT && action != ACTION_POWER) { // prevent double vibration
             doHapticFeedbackFP(false);

LineageActions/src/org/lineageos/settings/device/actions/Constants.java

@@ -64,6 +64,7 @@ public class Constants {
     public static final int ACTION_EMAIL = 118;
     public static final int ACTION_MESSAGES = 119;
     public static final int ACTION_PIP = 120;
+    public static final int ACTION_LAST_APP = 121;
     public static final int[] sFPSupportedActions = new int[]{
             ACTION_HOME,
             ACTION_POWER,
@@ -78,7 +79,8 @@ public class Constants {
             ACTION_FLASHLIGHT,
             ACTION_CAMERA,
             ACTION_SCREENSHOT,
-            ACTION_PIP
+            ACTION_PIP,
+            ACTION_LAST_APP
     };
     public static final int[] sFPSupportedActionsScreenOff = new int[]{
             ACTION_POWER,