android - Arcgis : how to get device location

Question

嘿，我试图在我的应用程序中实现这些代码，但它不起作用，我不知道我哪里出错了。

基本上，当我启动设备位置示例时。它没有显示我当前所在的位置，也没有看到任何与我当前所在位置相似的蓝点。

我唯一看到的就是 map 。只是一个普通的缩小 map 。

如果有人可以帮助我了解如何使用 map 上显示的蓝点获取当前位置，我将非常感激。

这是我的 MainActivity.class

public class HelloWorld extends Activity {
MapView mMapView = null;
ArcGISTiledMapServiceLayer tileLayer;


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    // Retrieve the map and initial extent from XML layout


        mMapView = (MapView) findViewById(R.id.map);

         mMapView.addLayer(new ArcGISTiledMapServiceLayer(
             "http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"));

         mMapView.setOnStatusChangedListener(new OnStatusChangedListener() {

           public void onStatusChanged(Object source, STATUS status) {
             if (source == mMapView && status == STATUS.INITIALIZED) {
               LocationService ls = mMapView.getLocationService();
               ls.setAutoPan(false);

               ls.start();
             }

           }

         });



    }


protected void onPause() {
    super.onPause();
    mMapView.pause();
   }

@Override
protected void onResume() {
    super.onResume(); 
    mMapView.unpause();
}   

}

Answer 1

这是一个代码，每 1 秒通过提供商和 GPS 绘制我的位置。让我们先声明变量:

private GraphicsLayer myGraphicalLayer;
MapView mMapView;
    ArcGISLocalTiledLayer baseLayer;
private LocationManager mlocManager;
    private LocationListener mlocListener;

在 onCreate 函数中我们调用 LocationListener:

mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        mlocListener = new MyLocationListener();
        mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, mlocListener);
        mlocManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000, 0, mlocListener);
// loading the map
        mMapView = (MapView) findViewById(R.id.localMap);
        baseLayer = new ArcGISLocalTiledLayer(basemapurl);
        mMapView.addLayer(baseLayer);
// defining my position layer
        myGraphicalLayer = new GraphicsLayer();

然后是绘制我的位置的函数:

private void SetMyLocationPoint(final double x, final double y) {
        PictureMarkerSymbol myPin = new PictureMarkerSymbol(getResources().getDrawable(
                R.drawable.mylocation_icon));

        Point wgspoint = new Point(x, y);
        Point mapPoint = (Point) GeometryEngine.project(wgspoint, SpatialReference.create(4326),
                mMapView.getSpatialReference());

        Graphic myPinGraphic = new Graphic(mapPoint, myPin);

        try {
            myGraphicalLayer.removeAll();
        } catch (Exception e) {
            e.printStackTrace();
        }

        myGraphicalLayer.addGraphic(myPinGraphic);
        myGraphicalLayer.setVisible(true);
        mMapView.addLayer(myGraphicalLayer);

    }

创建实现 MyLocationListener 的内部类来获取即时位置，并让它像这样调用名为 SetMyLocationPoint 的函数:

public class MyLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location loc) {
            SetMyLocationPoint(loc.getLongitude(), loc.getLatitude());
        }

        @Override
        public void onProviderDisabled(String provider) {
            Toast.makeText(getApplicationContext(), "provider enabled", Toast.LENGTH_SHORT)
                    .show();
        }

        @Override
        public void onProviderEnabled(String provider) {
            Toast.makeText(getApplicationContext(), "provider disabled", Toast.LENGTH_SHORT)
                    .show();
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
        }
    }