android - SupportMapFragment 与 ViewPager : Cannot move camera or change map settings

Question

我在 SupportMapFragment 和将相机移动到 map 上的某个位置时遇到问题。

public class MapPositionFragment extends SupportMapFragment implements LocationListener{

private GoogleMap map = null;
private Button lockButton = null;
private Location currentLocation = null;
private LocationManager locationManager = null;
private View mapView = null;

@Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    mapView = super.onCreateView(inflater, container, savedInstanceState);
    View v = inflater.inflate(R.layout.fragment_route_map, container, false);

    SetUpMap(v);
    return v;
  }

@Override
public void onResume() {
    // TODO Auto-generated method stub
    super.onResume();
}

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {

    if (isVisibleToUser){
        SetUpLocationService();
    }
}   

private void SetUpLockButton(){
    lockButton = (Button)getActivity().findViewById(R.id.lock_screen_button);
    lockButton.setOnClickListener(new OnClickListener() {           
        public void onClick(View v) {
            ToggleLockButton();
        }
    });     
}

private void ToggleLockButton(){
    BaseSwipeActivity baseActivity = (BaseSwipeActivity)getActivity();
    boolean swipeEnabled = baseActivity.TogglePaging();

    if (swipeEnabled){
        lockButton.setBackgroundResource(R.drawable.stock_lock_open);
    }
    else{
        lockButton.setBackgroundResource(R.drawable.stock_lock);
    }
}

private void SetUpLocationService(){
    boolean gpsIsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
    boolean networkIsEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

    if (networkIsEnabled){
        // Register the listener with the Location Manager to receive location updates
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
    } else if (gpsIsEnabled){
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
    }

}

private void SetCurrentLocation(final Location location){

    if (map != null){
        getActivity().runOnUiThread(new Runnable() {
              public void run() {
                LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
                CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 10);
                map.moveCamera(cameraUpdate);
              }
        });

    }
}

private void SetUpMap(View view) {
    if (map == null){
        getActivity().runOnUiThread(new Runnable() {
              public void run() {
                map = getMap();
                map.getUiSettings().setMyLocationButtonEnabled(true);
                map.setIndoorEnabled(true);
                map.getUiSettings().setZoomControlsEnabled(false);
                locationManager = (LocationManager)getActivity().getSystemService(Context.LOCATION_SERVICE);
              }
        });
    }
}

@Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    SetUpLockButton();
  }


public void onLocationChanged(Location location) {
      // Called when a new location is found by the network location provider.
      SetCurrentLocation(location);
}

public void onProviderDisabled(String arg0) {
    // TODO Auto-generated method stub

}

public void onProviderEnabled(String arg0) {
    // TODO Auto-generated method stub

}

public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
    // TODO Auto-generated method stub

}   

它是位于 ViewPager 内的 SupportMapFragment。显示了 map ，但我无法更改 map 设置，也无法更改相机位置。我想也许是因为它在另一个线程中，我必须使用 UI 线程，但这并没有改变任何东西。

所以也许有人有想法，那就太好了!

谢谢曼努埃尔

Answer 1

我今天遇到了同样的问题。这是我的解决方案。

如你所见:

// @ SetUpMap()
map = getMap();

替换为:

// Remeber to change the map id (R.id.map) to what you have in the layout .xml
map = ((SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.map))
        .getMap();

似乎此解决方案不适用于 Android 支持库 21.0.x(我已经针对 .2 和 .3 进行了测试)。由于此方法适用于较旧的 Android 支持库，因此可能存在错误等。