android - 无法从 Fragment 转换到 SupportMapFragment

Question

public class OutdoorFragment extends Fragment  {
private GoogleMap googleMap;
double latitude = 1.31039;
double longitude = 103.7784;

public OutdoorFragment() {
}

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_outdoor, container,
            false);

    try {
        // Loading map
        initilizeMap();

    } catch (Exception e) {
        e.printStackTrace();
    }

    googleMap.getUiSettings().setZoomGesturesEnabled(true);

    googleMap.getUiSettings().setRotateGesturesEnabled(true);

    googleMap.getUiSettings().setMyLocationButtonEnabled(true);

    googleMap.setMyLocationEnabled(true);

    // create marker
    MarkerOptions marker = new MarkerOptions().position(
            new LatLng(latitude, longitude)).title("Koh Chi Hao ");

    // adding marker

    marker.icon(BitmapDescriptorFactory
            .defaultMarker(BitmapDescriptorFactory.HUE_VIOLET));
    googleMap.addMarker(marker);


    return rootView;
}


private void initilizeMap() {
    if (googleMap == null) {
         googleMap = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();

        // check if map is created successfully or not
        if (googleMap == null) {
            Toast.makeText(getActivity().getApplicationContext(),
                    "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                    .show();
        }
    }
}

@Override
public void onResume() {
    super.onResume();
    initilizeMap();
}

你好，在我的 initializeMap() 中，googleMap = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();一直说 Cannot cast from Fragment to SupportMapFragment 。我不确定发生了什么。提前致谢

Answer 1

改变；

googleMap = ((SupportMapFragment) getFragmentManager().
            findFragmentById(R.id.map)).getMap();

有了这个;

googleMap = ((SupportMapFragment) getSupportFragmentManager().
            findFragmentById(R.id.map)).getMap();

请注意，getSupportFragmentManager 来自 android.support.v4.app.FragmentActivity。

祝你好运。