code: private void handleSavedInstanceState(@Nullable final Bundle savedInstanceState) {
          if (savedInstanceState != null) {
              floatingActionButtonsVisible =
                      savedInstanceState.getBoolean(FLOATING_ACTION_BUTTONS_VISIBLE_EXTRA);
              int visibility = floatingActionButtonsVisible ? View.VISIBLE : View.INVISIBLE;
              smallFloatingActionButton.setVisibility(visibility);
              normalFloatingActionButton.setVisibility(visibility);
              largeFloatingActionButton.setVisibility(visibility);
          }
      }
docs: Adapts the activity's views depending on the saved instance state, which has been passed to
  the activity.
  
  @param savedInstanceState
  The saved instance state as an instance of the class {@link Bundle} or null, if no
  saved instance state is available