LoaderManager and CursorLoader not working in ViewPager's Fragment

Question

I have a Fragment called AllSongsFragment in a ViewPager. The parent Activity extends android.support.v4.app.FragmentActivity.

I'm trying to implement LoaderManager and CursorLoader to get a cursor asynchronously. Below is the AllSongsFragment:

import android.support.v4.app.Fragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.Loader;
import android.support.v4.content.CursorLoader;

public class AllSongsFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> {
public void onActivityCreated(Bundle savedInstanceState) {
    .
    .
    getLoaderManager().initLoader(0, null, this);
}


@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    Toast.makeText(getActivity(), "YAYYYY", Toast.LENGTH_SHORT);
    Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    String[] projection = new String[] {MediaStore.Audio.Media._ID, MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.ARTIST};
    CursorLoader cursorLoader = new CursorLoader(getActivity(), uri, projection, null, null, null);
    return cursorLoader;
}

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
    Toast.makeText(getActivity(), "finished", Toast.LENGTH_SHORT);
}

@Override
public void onLoaderReset(Loader<Cursor> loader) {
    // TODO
}
}

My problem is that onCreateLoader() or any of the LoaderManager callback methods aren't getting called. The app doesn't crash either and there is no Exceptions. What am I doing wrong?

Answer 1

You are using the support library classes LoaderManager and CursorLoader. Hence you need to use the call to the support LoaderManager.

Replace

getLoaderManager().initLoader(0, null, this);

with

getActivity().getSupportLoaderManager().initLoader(0, null, (LoaderCallbacks<Cursor>)this);