private double lat=-1;//緯度  private double lon=-1;//經度 public class MainActivity extends ActivityBas{    protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);  ArcGISRuntime.setClientId("1eFHW78avlnRUPHm");//取消android/216279.html">android/116510.html">arcgis默認圖標  dingweilocation()；  mapView.centerAt(lat, lon, true);//設置定位中心點  mapView.setScale(1105828.1803422251);//設置顯示比例  }private void dingweilocation() {    //定位的方法  LocationDisplayManager locationDisplayManager = mapView.getLocationDisplayManager();  locationDisplayManager.setLocationListener(new LocationListener() {    @Override    public void onLocationChanged(Location location) {            String bdlat=location.getLatitude()+"";       String bdlon=location.getLongitude()+"";      if (bdlat.indexOf("E")==-1|bdlon.indexOf("E")==-1){      //這里做個判斷是因為，可能因為gps信號問題，定位出來的經緯度不正常。        Log.i("定位",lat+"?"+lon);        lat = location.getLatitude();//緯度        lon = location.getLongitude();//經度      }    }    @Override    public void onStatusChanged(String s, int i, Bundle bundle) {    }    @Override    public void onProviderEnabled(String s) {    }    @Override    public void onProviderDisabled(String s) {    }  });  locationDisplayManager.start();} }