title: Flutter map_view not showing markers
body: <p>I'm Using <a href="https://pub.dartlang.org/packages/map_view" rel="nofollow noreferrer">map_view</a> to display google map on flutter app. The map is displaying.The problem is that,markers are not showing here is the code.</p>
  
  <pre><code>_openGooleMap() {
         mapView.addMarker(new Marker("1", "George", -6.7244448, 34.8536052, color: Colors.red)); //Doesn't work
         mapView.onMapTapped.listen((location) =&gt; print("Touched location $location")); // Works
         mapView.show(                                                                  // Works
           new MapOptions(
           showUserLocation: true,
          title: "MAP",
          initialCameraPosition:
              new CameraPosition(new Location(-6.7244448, 34.8536052), 6.0)),
      toolbarActions: &lt;ToolbarAction&gt;[new ToolbarAction("X", 1)]);
  mapView.onToolbarAction.listen((id) {
    if (id == 1) {
      mapView.dismiss();
    }
  });
  </code></pre>
  
  <p>}</p>
  
  <p>What I might be doing wrong here?</p>