code: private void handleHideNavigationIntent(@NonNull final Bundle extras) {
          if (extras.containsKey(EXTRA_HIDE_NAVIGATION)) {
              hideNavigation(extras.getBoolean(EXTRA_HIDE_NAVIGATION));
          }
      }
docs: Handles the intent extra, which specifies, whether the navigation should be shown, or not.
  
  @param extras
  The extras of the intent, which has been used to start the activity, as an instance
  of the class {@link Bundle}. The bundle may not be null