code: public void initialize(OnNavigationReadyCallback onNavigationReadyCallback) {
      this.onNavigationReadyCallback = onNavigationReadyCallback;
      if (!isMapInitialized) {
        mapView.getMapAsync(this);
      } else {
        onNavigationReadyCallback.onNavigationReady(navigationViewModel.isRunning());
      }
    }
docs: Should be called after {@link NavigationView#onCreate(Bundle)}.
  <p>
  This method adds the {@link OnNavigationReadyCallback},
  which will fire the ready events for this view.
  
  @param onNavigationReadyCallback to be set to this view