List<Joke> getAllJokes() {
List<String> jokeKeys = mNotificationHelper.getJokeKeys();
return mJokeHelper.getJokes(jokeKeys.toArray(new String[jokeKeys.size()]));
}
NotificationDbManager(Context context) {
mNotificationHelper = NotificationDbHelper.getInstance(context);
mJokeHelper = JokeDbHelper.getInstance(context);
}