相关疑难解决方法(0)

我正在开发一个确定osm地图中用户位置的android应用程序.我能够在地图上显示用户位置,但如果位置改变整个地图重新加载,那有什么问题？另外我如何才能提高用户位置的准确性？如何根据准确度制作一个增加和减少的圆圈(如Google中所示)？

代码:

public class OsmDemoActivity extends Activity implements LocationListener, 
    MapViewConstants 
{  
private MapView mMapView; 
private MapController mapController; 
private LocationManager mLocMgr; 
private ItemizedOverlay<OverlayItem> mMyLocationOverlay; 
private ResourceProxy mResourceProxy; 

ArrayList<OverlayItem> items;

@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    mResourceProxy = new DefaultResourceProxyImpl(getApplicationContext()); 
    setContentView(R.layout.main); 
    //mMapView.setUseDataConnection(false);
    initilaizeMap();
    //addOverlay(); 
    mLocMgr = (LocationManager) getSystemService(LOCATION_SERVICE); 
    mLocMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);      
} 

public void initilaizeMap()
{
    mMapView = (MapView) this.findViewById(R.id.mapView); 
    mMapView.setTileSource(TileSourceFactory.MAPNIK); 



    //mMapView.setUseDataConnection(false);



    mMapView.setBuiltInZoomControls(true); 
    mMapView.setMultiTouchControls(true); 
    mapController = this.mMapView.getController(); 
    mapController.setZoom(15); 
    mapController.setCenter(new GeoPoint(15.610762,32.540345));


    /*
    final MyLocationOverlay myLocationOverlay = new MyLocationOverlay(this, mMapView, 
            mResourceProxy); 
    myLocationOverlay.enableMyLocation(); …