Question

我正在使用应用程序，我必须在地图上显示没有Marker。我已经通过片段展示地图，现在想要使用markerOptions()来获取我的位置。但是这显示了GoogleMap null

public class MapFineTech extends Fragment {
GoogleMap googleMap;
 double getlatitude,getlongitude;
 String latitude_mString,longitude_mString;
 MapView mapView;
 ViewGroup container;
 Fragment fragment;
 GPSTracker gps;
 MarkerOptions marker;


 public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

  View rootView = inflater.inflate(R.layout.map_fine_tech, container,  false);
 fragment =  getFragmentManager().findFragmentById(R.id.map);

 Log.d("u r", "ur in register device");
new Thread(null,registerDeviceThread,"").start();
gps = new GPSTracker(getActivity());
 if(gps.canGetLocation()){

     getlatitude = gps.getLatitude();
     getlongitude = gps.getLongitude();
     latitude_mString = String.valueOf(getlatitude);
     longitude_mString = String.valueOf(getlongitude);
     Log.d("Value of lat and long",  latitude_mString+""+longitude_mString);
     Log.d("u r", "ur in register lati loni");
        new Thread(null,latlongThread,"").start();

}else{

    gps.showSettingsAlert();
}
 Log.d("Value of lat and long",  latitude_mString+""+longitude_mString);

 marker = new MarkerOptions().position(new LatLng(getlatitude,    getlongitude));
googleMap.addMarker(marker);
 marker.icon(BitmapDescriptorFactory.fromResource(R.drawable.applogo));

 return rootView;
}

@Override
public void onDestroyView() {
    // TODO Auto-generated method stub
    try{

        if (fragment != null) {

             fragment =  getFragmentManager().findFragmentById(R.id.map);
               FragmentTransaction ft = getActivity().getFragmentManager().beginTransaction();
               ft.remove(fragment);
               ft.commit();
        }
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
         Thread.interrupted();
    super.onPause();
  }

通过此代码映射可以显示，但是当我将addMarker添加到googleMap时，由于googleMap而导致的app crasher为null。

Answer 1

作为这个问题的答案：

进口

com.google.android.gms.maps.MapFragment

并编辑

 public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

      View rootView = inflater.inflate(R.layout.map_fine_tech, container,  false);
     fragment =  getFragmentManager().findFragmentById(R.id.map);
     googleMap = ((MapFragment) fragment).getMap(); // this is the edit

     ......// the rest of the code

    }

如何使用fragment中的markerOptions来使用LatLng（）方法获取MyLocation

1 个答案: