public void OnMapReady(MapboxMap mapboxMap)
{
this.mapboxMap = mapboxMap;
navigationMapRoute = new NavigationMapRoute(null, mapView, mapboxMap, "admin-3-4-boundaries-bg");
Gson gson = new GsonBuilder().RegisterTypeAdapterFactory(DirectionsAdapterFactory.Create()).Create();
var json = loadJsonFromAsset(DIRECTIONS_RESPONSE);
DirectionsResponse response = (DirectionsResponse)gson.FromJson(json, Class.FromType(typeof(DirectionsResponse)));
navigationMapRoute.AddRoute(response.Routes()[0]);
mapboxMap.SetOnMapLongClickListener(this);
navigationMapRoute.SetOnRouteSelectionChangeListener(this);
}