Я пытаюсь запросить плейлисты на устройстве из MediaStore. Я следил за вопросом, заданным ранее, но я не получил ответа.

Вот как я запрашиваю плейлисты

public void addToPlaylist(long playlistId, Context context,
                          ArrayList<Play> playlistTracks, String playlistName) {
    int count = getPlaylistSize(playlistId, context);
    Log.d("playlist size=", "" + count);

    ContentValues[] values = new ContentValues[playlistTracks.size()];
    for (int i = 0; i < playlistTracks.size(); i++) {
        values[i] = new ContentValues();
        values[i].put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, i
                      + count + 1);
        values[i].put(MediaStore.Audio.Playlists.Members.AUDIO_ID,
                      playlistTracks.get(i).getId());
        values[i].put(MediaStore.Audio.Playlists.NAME, playlistName);
    }
    ContentResolver resolver = context.getContentResolver();
    Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external",
                                                               playlistId);
    int num = resolver.bulkInsert(uri, values); 
    Log.d("songs added=", "" + num); // added
    resolver.notifyChange(Uri.parse("content://media"), null);

}

private int getPlaylistSize(long playlistId, Context context)
{
    // TODO: Implement this method
    return 0;
}
public void retrieveAllPlaylists(Context context) {

    Uri tempPlaylistURI = MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI;

    final String idKey = MediaStore.Audio.Playlists._ID;
    final String nameKey = MediaStore.Audio.Playlists.NAME;


    final String[] columns = { idKey, nameKey };

    Cursor playListCursor = context.getContentResolver().query(
        tempPlaylistURI, columns, null, null, null);

    if (playListCursor != null) {
        Log.d("playlist cursor count=", "" + playListCursor.getCount());

        for (boolean hasItem = playListCursor.moveToFirst(); hasItem; hasItem = playListCursor
        .moveToNext()) {
            playlistName = playListCursor.getString(playListCursor
                                                    .getColumnIndex(nameKey));
            // noOfTracks = playListCursor.getInt(playListCursor
            // .getColumnIndex(tracksCountKey));
            Log.d(this.getClass().getName(), "playlistname=" + playlistName // returns only default playliststhe
                  + "tracks=" + noOfTracks);
            playlistModel.add(new Play(playlistName, noOfTracks));
        }


    }

}

Все, что я получаю, это пустой экран. Пожалуйста, ведите меня