setResult does not work when BACK button pressed

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You need to overide the onBackPressed() method and set the result before the call to superclass, i.e

@Override
public void onBackPressed() {
    Bundle bundle = new Bundle();
    bundle.putString(FIELD_A, mA.getText().toString());
    
    Intent mIntent = new Intent();
    mIntent.putExtras(bundle);
    setResult(RESULT_OK, mIntent);
    super.onBackPressed();
}

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