Question

I have two Activities, say A1 and A2. sequence being A1->A2
From A1 I start A2 without calling finish() in A1.
After I press the back button in A2 I want to trigger a function in A1.
However, if I use onResume() in A1, the function is triggered even during the start of activity A1, which I want to avoid.
It should only be called during the ‘back’ press of A2.

Answer 1

Well start A2 with startActivityForResult then in

A1 implement

  @Override
  public void onActivityResult(final int requestCode, int resultCode, final Intent data) {

   // your code here

}

in A2 override onBackPresset to set result before finishing the activity. Thats it.