Question

我正面临一个严重的问题。我想得到纬度和经度，但应用程序异常停止。我不知道为什么。我也接受了清单的许可。请帮助我，任何形式的帮助将受到高度赞赏。感谢

This is my Fragment

public class FragmentThree extends Fragment {
    FindLocation  Fl;
    GPSTracker  gps;
    public FragmentThree() {
        Fl = new FindLocation();
        gps = new GPSTracker(getActivity());
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.location, container, false);
        Location location = gps.getLocation();
        String latLongString = gps.updateWithNewLocation(location);
        Toast.makeText(getActivity(), latLongString, Toast.LENGTH_SHORT).show();
        return view;
   }
}

GpsTracker.java

public class GPSTracker {
    Context mContext;

     public GPSTracker(Context mContext){
           this.mContext = mContext;
     }

    public Location getLocation(){
        LocationManager locationManager;
        String context = Context.LOCATION_SERVICE;
        locationManager = (LocationManager) mContext.getSystemService(context);

        String provider = LocationManager.GPS_PROVIDER;
        Location location = locationManager.getLastKnownLocation(provider);

        return location;
    }

    public String updateWithNewLocation(Location location) {
        String latLongString;

        if (location != null){
            double lat = location.getLatitude();
            double lng = location.getLongitude();
            latLongString = "Lat:" + lat + "\nLong:" + lng;
        }else{
            latLongString = "No Location";
        }

        return latLongString;
    }
}

Answer 1

 gps = new GPSTracker(getActivity());

getActivity在实例化时返回null。您必须等到片段附加到Activity。你应该等到调用onAttach。如果尚未获取位置，getLastKnownLocation也返回null

不幸的是，应用已停止

1 个答案: