MainActivity.cs

    public class MainActivity : AppCompatActivity, IOnMapReadyCallback
    {
        private GoogleMap m_map;
        private MapView m_mapView;
        
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            SupportActionBar.Hide();

            // Set our view from the "MainActivity" layout resource
            SetContentView(Resource.Layout.MainActivity);
            m_mapView = FindViewById<MapView>(Resource.Id.mainactivity_mapView);

            m_mapView.OnCreate(bundle);
            m_mapView.GetMapAsync(this);
        }
        
        public void OnMapReady(GoogleMap map)
        {
            m_map = map;
        }

        protected override void OnPause()
        {
            base.OnPause();
            m_mapView.OnPause();
        }

        protected override void OnResume()
        {
            base.OnResume();
            m_mapView.OnResume();
        }

        protected override void OnSaveInstanceState(Bundle outState)
        {
            base.OnSaveInstanceState(outState);
            m_mapView.OnSaveInstanceState(outState);
        }
    }