[FIXED] Unable to exit Flutter app in Android 12.0

Issue

I'm trying to exit the app by pressing the back button on Android. Pre Android 12, my MainActivity.onDestroy gets called but with Android 12.0, it's not getting called.

Solution

Make sure your MainActivity extends FlutterActivity and not FlutterFragmentActivity as with Android 12, the later's onDestroy won't get called. So:

Works for all Android versions:

class MainActivity extends FlutterActivity {}

Works for Android < 12.

class MainActivity extends FlutterFragmentActivity {}

Answered By - iDecode
Answer Checked By - Timothy Miller (JavaFixing Admin)