在地图视图中，标记正在加载，但地图未加载

Question

我正在尝试在片段中创建一个地图视图，通过单击导航栏选项显示该视图。因此，当我尝试使用地图视图打开我的片段时，我能够看到地图标记而不是地图。以下是我的代码。

片段代码：

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment

    View v = inflater.inflate(R.layout.fragment_map, container, false);
    MapView mapView = (MapView) v.findViewById(R.id.mapView);
    mapView.onCreate(savedInstanceState);
    // Gets to GoogleMap from the MapView and does initialization stuff
    mapView.getMapAsync(this);

    //intiMap(mapView);
    return v;
}

private void intiMap(MapView mapView) {
    try {
        mapView.getMapAsync(this);
    }catch (Exception e){
        Log.d("InitMap",e.getMessage());
    }

}


public boolean googleServiceAvailable() {
    GoogleApiAvailability apiAvailability =  GoogleApiAvailability.getInstance();
    int isAvailable = apiAvailability.isGooglePlayServicesAvailable(this.getContext());
    if(isAvailable == ConnectionResult.SUCCESS) {
        return true;
    } else if (apiAvailability.isUserResolvableError(isAvailable)){
        Dialog dialog =  apiAvailability.getErrorDialog(this.getActivity(),isAvailable,0);
        dialog.show();
    } else {
        Toast.makeText(this.getContext(), "Cant connect to play services", Toast.LENGTH_LONG);
    }
    return false;
}
@Override
public void onMapReady(GoogleMap map) {
    _googleMap = map;
    _googleMap.getUiSettings().setMyLocationButtonEnabled(false);
    if (ActivityCompat.checkSelfPermission(this.getContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this.getContext(), android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    _googleMap.setMyLocationEnabled(true);
    _googleMap.getUiSettings().setZoomControlsEnabled(true);
    MapsInitializer.initialize(this.getActivity());

    // Updates the location and zoom of the MapView
    CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(new LatLng(43.1, -87.9), 10);
    map.animateCamera(cameraUpdate);

    //_googleMap.addMarker(new MarkerOptions().position(new LatLng(0,0)));
}

主要活动代码：

public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    Fragment fragment = null;
    int id = item.getItemId();

    if (id == R.id.nav_camera) {
        // Handle the camera action
    } else if (id == R.id.nav_gallery) {
        fragment = new MapFragment();

    } else if (id == R.id.nav_slideshow) {

    } else if (id == R.id.nav_manage) {

    } else if (id == R.id.nav_share) {

    } else if (id == R.id.nav_send) {

    }

    if(fragment != null){
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        FragmentManager fm = this.getSupportFragmentManager();
        for(int i = 0; i<fm.getBackStackEntryCount(); i++){
            fm.popBackStack();
        }
        ft.replace(R.id.context_main,fragment);
        ft.commit();
    }

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

下面是我可以看到的地图：

由于地图已加载，我相信不存在任何与密钥或权限相关的问题。