How to determine the activity that called onResume()???

Question

Android

There is an activity1 with a button. If you press the button, the activity2 will open. If you press back in activity2, the onResume() event in activity1 will fire.
How do I know from activity1 that onResume() called activity2 and not 3 or 4...?

Answer 1

1) the activity does not call onResume.
2) to determine, you can use the startActivityForResult / onActivityResult mechanism