@Override
 public Observable<RecentResponseJson> getRecentItems(String lastId, final int count) {
   QueryParams params = getBasicQueryParams().add("count", count);
   String url = makeApiUrl(REQUEST_RECENT_MEDIA, params, Prefs.getUserId());
   if (lastId != null) {
     params.add("max_id", lastId);
   }
   Request.Builder request = new Request.Builder().url(url);
   return makeRequest(request, new TypeToken<RecentResponseJson>() {}.getType());
 }
 private QueryParams getBasicQueryParams() {
   return new QueryParams().add(PARAM_TOKEN, Prefs.getAccessToken());
 }