@Override
 protected void onStart() {
   super.onStart();
   spiceManager.start(this);
   spiceManager.addListenerIfPending(ListTweets.class, JSON_CACHE_KEY, new TweetRequestListener());
   spiceManager.getFromCache(
       ListTweets.class, JSON_CACHE_KEY, DurationInMillis.ALWAYS, new TweetRequestListener());
 }