title: How to add google map on navigation drawer activity?
body: <p>Problem with this, This code is also not working..</p>
  
  <pre><code>public class MainActivity extends AppCompatActivity
          implements NavigationView.OnNavigationItemSelectedListener
  
  
  mapView = (MapView)findViewById(R.id.map);
  
  
      mapView.onCreate(savedInstanceState);
      mapView.getMapAsync(new OnMapReadyCallback() {
          @Override
          public void onMapReady(GoogleMap googleMap) {
              googleMap.addMarker(new MarkerOptions()
                      .position(new LatLng(37.7750, 122.4183))
                      .title("San Francisco")
                      .snippet("Population: 776733"));
          }
      });
  </code></pre>