Navigation Bar Apk 4.4.2 -

If root is available, the APK can directly inject events using /dev/input/eventX or input keyevent via su :

// In AccessibilityService implementation private void performGlobalAction(int action) switch (action) case BACK: performGlobalAction(GLOBAL_ACTION_BACK); break; case HOME: performGlobalAction(GLOBAL_ACTION_HOME); break; case RECENTS: performGlobalAction(GLOBAL_ACTION_RECENTS); break;

Since Android 4.4.2 restricts InputManager injection, the APK uses Accessibility Service to perform global actions: