当前Loation不采摘android

Question

我现在正在处理与Google地图服务相关的项目。我想指出我目前在我的地图中的位置。为此，我有了使用itemizedoverlay的想法。我在Geopoint的帮助下检索当前位置。但是当我在代码中使用itemizedoverlay时，无法拾取位置，我在我的OnCreate方法中使用它。如果我将它移动到OnLocationChanged方法，那么GeoPoint（point）将不会被itemedoverlay拾取，并且会以错误结束，并且在当前情况下，应用程序被压缩。

 MapView mapView; 
    Location location; 
    LocationManager locationmanager; 
    LocationListener locationlistener; 

     public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

     mapView = (MapView) findViewById(R.id.mapView); 
     mapView.setTraffic(true); 
     mapView.setBuiltInZoomControls(true); 

     //locationmanager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
    // locationlistener = new GPSLocationListener(); 
     // locationmanager.requestLocationUpdates(LocationManager.GPS_PROVIDER 0,0,locationlistener);                       

     GeoPoint point = new GeoPoint(
       (int) (location.getLatitude() * 1E6), 
       (int) (location.getLongitude() * 1E6)); 

      Toast.makeText(getBaseContext(), 
       "Latitude: " + location.getLatitude() + 
       " Longitude: " + location.getLongitude(), 
       Toast.LENGTH_SHORT).show(); 

     List<Overlay> mapOverlays = mapView.getOverlays(); 
     Drawable drawable = this.getResources().getDrawable(R.drawable.icon); 


      HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable,this); 
      OverlayItem overlayitem = new OverlayItem(point,"",""); 
      itemizedoverlay.addOverlay(overlayitem); 
      mapOverlays.add(itemizedoverlay); 

} 

/*  private class GPSLocationListener implements LocationListener 
     { 
     @Override 
     public void onLocationChanged(Location location) { 
      if (location != null) { 
      GeoPoint point = new GeoPoint(
       (int) (location.getLatitude() * 1E6), 
       (int) (location.getLongitude() * 1E6)); 

      Toast.makeText(getBaseContext(), 
       "Latitude: " + location.getLatitude() + 
       " Longitude: " + location.getLongitude(), 
       Toast.LENGTH_SHORT).show(); 

      OverlayItem overlayitem = new OverlayItem(point,"",""); 
       itemizedoverlay.addOverlay(overlayitem); 
       mapOverlays.add(itemizedoverlay); 

} 
     } */ 


    @Override 
    protected boolean isRouteDisplayed() { 
     // TODO Auto-generated method stub 
     return false; 
    } 

    @Override 
    public void onLocationChanged(Location location) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void onProviderDisabled(String provider) { 

Toast.makeText(getBaseContext(),"GPS Disabled",Toast.LENGTH_SHORT).show();  

    } 

    @Override 
    public void onProviderEnabled(String provider) { 

     Toast.makeText(getBaseContext(),"GPS Enabled",Toast.LENGTH_SHORT).show(); 

    } 

    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) { 
     // TODO Auto-generated method stub 

    } 

您能否为我推荐一个解决方案？先谢谢了，如果我在这里犯了错误，我很抱歉。

Answer 1

您可以使用com.google.android.maps.MyLocationOverlay将自动获得显示在您的地图视图您的位置。它甚至会在旅行时更新您的位置。

注意：您分别在onResume和onPause上显示调用enableMyLocation和disableMyLocation以获得更好的性能。

@Override 
    protected void onResume() { 
     super.onResume(); 
     if (locationOverlay != null) 
      locationOverlay.enableMyLocation(); 
    } 

    @Override 
    protected void onPause() { 
     if (locationOverlay != null) 
      locationOverlay.disableMyLocation(); 
     super.onPause(); 
    } 

EDITED

MyLocationOverlay locationOverlay; 

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     mapView = (MapView) findViewById(R.id.mapView); 
     mapView.setTraffic(true); 
     mapView.setBuiltInZoomControls(true); 
locationOverlay = new MyLocationOverlay(this, mapView); 
List<Overlay> mapOverlays = mapView.getOverlays(); 
mapOverlays.add(locationOverlay); 
} 

还添加的onResume（）和的onPause（）方法。

Answer 2

我觉得你有与Google Maps Android API v2

去的更多信息，请检查Google Maps Android API v2。

请从上面的链接检查示例代码的链接。 sample code

Answer 3

位置是没有在那里由您在的onCreate（）初始化所以我想它的空。还有一件事，如果你有拉特和长，分项将肯定会显示地图上的位置。 需要检查许可Access_Course_location and Access_fine_location in Manifest。

Answer 4

尝试用这个 -

/** 
* Setting Google Map to provided location 
*/ 
private void setMaptoLocation(Location location) { 
    mapView.setBuiltInZoomControls(true); 
    mapView.setSatellite(true); 
    int LAT = (int)(location.getLatitude() * 1E6) ; 
    int LNG = (int)(location.getLongitude() * 1E6) ; 
    GeoPoint point = new GeoPoint(LAT, LNG); 
    mapController = mapView.getController(); 
    List<Overlay> mapOverlays = mapView.getOverlays(); 
    Drawable drawable = this.getResources().getDrawable(R.drawable.icon); 
    HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable,this); 
    OverlayItem overlayitem = new OverlayItem(point,"",""); 
    itemizedoverlay.addOverlay(overlayitem); 
    mapOverlays.add(itemizedoverlay); 
    mapController.setZoom(ZOOM_LEVEL - ZOOM_LEVEL/2); // Set zoom level per requierment 
    mapController.animateTo(point); 

}