code: public static void supportShowOnLoaderCallback(Handler handler, final android.support.v4.app.FragmentManager manager, final android.support.v4.app.DialogFragment fragment, final String tag) {
          handler.post(new Runnable() {
              @Override
              public void run() {
                  fragment.show(manager, tag);
              }
          });
      }
docs: Show {@link android.support.v4.app.DialogFragment} with the specified tag on the loader callbacks.
  @param handler the handler, in most case, this handler is the main handler.
  @param manager the manager.
  @param fragment the fragment.
  @param tag the tag string that is related to the {@link android.support.v4.app.DialogFragment}.