setResult does not work when BACK button pressed

Question

I am trying to setResult after the BACK button was pressed. I call in onDestroy

Intent data = new Intent();
setResult(RESULT_OK, data) 

But

Answer 1

I refactored my code. Initially I prepared some data and set it as activity result in onDestroy (this did not work). Now I set activity data each time the data to be returned is updated, and have nothing in onDestroy.