private void showNetworkError() {
   mListView.setVisibility(View.GONE);
   pageStateView.setVisibility(View.VISIBLE);
   pageStateView.setMode(PageStatus.PageNetwork);
   progressBar.setVisibility(View.GONE);
 }
 private void showRelatedData() {
   mListView.setVisibility(View.VISIBLE);
   pageStateView.setVisibility(View.GONE);
   progressBar.setVisibility(View.GONE);
 }