GoogleMap getMapAsync 在片段中不起作用

Question

我正在尝试在我的项目中实现 googleMaps，我只是添加了一个新片段和以下代码。目前我可以在我的项目中显示地图，但添加标记不起作用，mapFragment.getMapAsync(this) 给出以下错误消息。无法解析方法'getMapAsync(testCodes.project2.MapFragment)。

public class MapFragment extends Fragment implements OnMapReadyCallback {
    private GoogleMap mMap;
//    private MapView mapView;
    private Boolean mapReady = false;
    private GoogleApiClient mGoogleApiClient;
    private LocationRequest mLocationRequest;

    public MapFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_map, container, false);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        MapFragment mapFragment = (MapFragment) this.getChildFragmentManager().findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);//remember getMap() is deprecated!


//    mapFragment.getMapAsync(this);
        return view;
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        LatLng sydney = new LatLng(-33.852, 151.211);

        MarkerOptions markerOptions = new MarkerOptions().position(sydney).title("Random position");
        googleMap.addMarker(markerOptions);
        googleMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
        checkPermission("Permission", 1, 1);
        mMap.setMyLocationEnabled(true);
    }


}

片段的xml。

<fragment
        android:id="@+id/map"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.SupportMapFragment"></fragment>

Answer 1

在 xml 文件中，您使用的是 class="com.google.android.gms.maps.SupportMapFragment"，所以在 MapFragment.java 中您必须使用SupportMapFragment 而不是 MapFragment。

改变这个：

MapFragment mapFragment = (MapFragment) this.getChildFragmentManager().findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);//remember getMap() is deprecated!

到：

            SupportMapFragment mapFragment = (SupportMapFragment) this.getChildFragmentManager().findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);//remember getMap() is deprecated!