onActivityResult is not called when the back button in ActionBar is clicked

Question

Here is my problem:

1. Create a MainActivity. Add a button which will start another activity SecondActivity.

           Intent i = new Intent(getActivity(),SecondActivity.class);
           startActivityForResult(i,0);
   

2. Inside the SecondActivity, I capture the back button click event and also add a button to return to the first Activity.

   When back button in action bar is clicked:

@Override

public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {
        case android.R.id.home:
            // back button
            Intent resultIntent = new Intent();
            // TODO Add extras or a data URI to this intent as appropriate.
            setResult(Activity.RESULT_OK, resultIntent);
            //finish();
            return false;

    }
    return super.onOptionsItemSelected(item);
}

When the button inside activity is clicked:

Button btn = (Button)this.findViewById(R.id.button2);
btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent resultIntent = new Intent();
        // TODO Add extras or a data URI to this intent as appropriate.
        setResult(Activity.RESULT_OK, resultIntent);
        finish();
    }
});

The onActivityResult in MainActivity is called when I click the button inside the SecondActivity, but it's never been called if I click the back button in Actionbar of SecondActivity. Can anybody tell me why? Thanks

Answer 1

Here is the code which is working:

public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {
        case android.R.id.home:
            // back button
            Intent resultIntent = new Intent();
            setResult(Activity.RESULT_OK, resultIntent);
            finish();
            return true;

    }
    return super.onOptionsItemSelected(item);
}

I guess the finish() will close the current Activity, and return true inform that action has been processed. (The default back action seems to be different from finish().)