onActivityResult return data from fragment to activity

Question

I Have an activity A that opens an activity B using startActivityForResult.

Now in activity B it's an activity fragment holder as well it contains an ActionBar with menu items.

Now whenever I press action bar button in activity B it should return data from selected fragment of an activity B not to its holder instead it should return data to activity A because it's the one who did the launch.

So it's basically passing data fragment (inside activity B) to activity B then to Activity A.

I am trying hopelessly to find a way to solve it. Is there any possible way to do it?

Answer 1

Disclaimer there are many ways, this is the one I prefer, not the best ever and not the perfect one, I just like this.

The easiest way, in my opinion, is to pass the data from Fragment inside B to ActivityB, then from ActivityB to ActivityA.

Step 1 to pass data from Fragment to container activity you have many ways; the one I usually use is to use an Interface:

Create interface for ActivityB

public interface IActivityB {
    void setDataAAndFinish(whateverType data);
}

Implement interface in your activityB

public class InterventoActivity extends AppCompatActivity implements IInterventoActivity {

    @Override
    protected void onResume() {
        super.onResume();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    private Bundle dataA = null;
    @Override
    public void setDataAAndFinish(whateverType data) {
        dataA = data;
        Intent intent = new Intent();
        intent.putExtra("data", data)
        setResult(RESULT_OK, intent);        
        finish();
    }
}

Set activityA to request and accept return from ActivityB

first, start activityB for result and not normally

Intent i = new Intent(this, ActivityB.class);
startActivityForResult(i, 1);

Then read result

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 1) {
         if(resultCode == RESULT_OK) {
             whateverType data = data.getStringExtra("data");
         }     
    }
} 

Now from fragment

((IActivityB)getActivity()).setDataAAndFinish(myDatas);