private void getOlderTweets() {

    long max_id = 0;
    if (!mAdapter.isEmpty()) {
      max_id = mAdapter.getItem(mAdapter.getCount() - 1).getId();
    }

    new UserFeedsRequest(mActivity, mScreenName, 0, max_id) {

      public void onPreExecute() {};

      public void onCallBack(String url, Tweet[] result, AjaxStatus status) {

        mListview.showList();
        mListview.hideMoreProgress();

        if (result != null) {
          if (result.length < Constants.TWEETS_COUNT) {
            mListview.setLoadingMore(false);
          }
          mAdapter.addTweets(result);
        } else {
          Toast.makeText(mActivity, "Failed to get more feeds", Toast.LENGTH_SHORT).show();
        }
      };
    }.get();
  }
  private void getNewTweets() {

    long since_id = 0;
    if (!mAdapter.isEmpty()) {
      since_id = mAdapter.getItem(0).getId();
    }

    new UserFeedsRequest(mActivity, mScreenName, since_id, 0) {

      public void onPreExecute() {
        if (mAdapter.getCount() <= 0) {
          mListview.showProgress();
        }
      };

      public void onCallBack(String url, Tweet[] result, AjaxStatus status) {

        if (result != null) {
          mAdapter.insertTweets(0, result);
          mListview.showList();
        } else {
          if (mAdapter.isEmpty()) {
            DialogsManager.showRetryRequestDialog(
                mActivity,
                this,
                RequestType.GET,
                new OnClickListener() {

                  @Override
                  public void onClick(DialogInterface dialog, int which) {
                    if (mAdapter.isEmpty()) {
                      dialog.dismiss();
                      mActivity.finish();
                    }
                  }
                });
          } else {
            mListview.getSwipeToRefresh().setRefreshing(false);
            DialogsManager.showToast(mActivity, "Failed to get new tweets.");
          }
        }
      };
    }.get();
  }