Android: Callback AsyncTask to Fragment(Not Activity)

Question

I am trying to implement callback between AsyncTask and Fragment but cannot find correct info how to do it. The issue is that all callback implementations are between activ

Answer 1

Without taking your code in consideration I will post the most essential to make a functional callback.

---

TestFragment:

public class TestFragment extends Fragment {

    /* Skipping most code and I will only show you the most essential. */    
    private void methodThatStartsTheAsyncTask() {
        TestAsyncTask testAsyncTask = new TestAsyncTask(new FragmentCallback() {

            @Override
            public void onTaskDone() {
                methodThatDoesSomethingWhenTaskIsDone();
            }
        });

        testAsyncTask.execute();
    }

    private void methodThatDoesSomethingWhenTaskIsDone() {
        /* Magic! */
    }

    public interface FragmentCallback {
        public void onTaskDone();
    }
}

---

TestAsyncTask:

public class TestAsyncTask extends AsyncTask<Void, Void, Void> {
    private FragmentCallback mFragmentCallback;

    public TestAsyncTask(FragmentCallback fragmentCallback) {
        mFragmentCallback = fragmentCallback;
    }

    @Override
    protected Void doInBackground(Void... params) {
        /* Do your thing. */
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        mFragmentCallback.onTaskDone();
    }
}