Android MapActivity＆ItemizedOverlay更改当前位置onTouchEvent

我有一个应用程序，其中一个活动显示地图和另一个用于在Map上放置标记或任何叠加项目的类。它工作的很好，但现在当用户触摸地图时，它会显示带有新位置的消息（此代码在AddItemizedOverlay的ontouche事件上实现）。Android MapActivity＆ItemizedOverlay更改当前位置onTouchEvent

我想改变地图上针对新位置（主要活动中的代码）的销。如何将新的位置数据从AddItemizedOverlay类传递到主要活动？我如何绘制新的用户位置？谢谢！

myMapactivity.java

public class myMapactivity extends MapActivity 
{ 

private MapView mapView; 
private MapController mapCtrl; 
List<Overlay> mapOverlays; 
GeoPoint mePoint; 

AddItemizedOverlay itemizedOverlay; 
OverlayItem overlayitem; 

    public void onCreate(Bundle savedInstanceState) 
    { 
     ... 

     mapView = (MapView) findViewById(R.id.mapview); 
    mapView.setSatellite(false); 
    mapView.setBuiltInZoomControls(true); 

    mapOverlays = mapView.getOverlays(); 
    mapOverlays.clear(); 
    mapCtrl = mapView.getController(); 

     drawCurrentUserLocation(); 
    } 

    private void drawCurrentUserLocation() 
{ 

    // Drawable marker icon 
    Drawable drawable_user = this.getResources() 
      .getDrawable(R.drawable.mark_red); 

    itemizedOverlay = new AddItemizedOverlay(drawable_user, this); 

    overlayitem = new OverlayItem(mePoint, "Your Location","That is you!"); 

    itemizedOverlay.addOverlay(overlayitem); 

    mapOverlays.add(itemizedOverlay); 
    itemizedOverlay.populateNow(); 
    mapCtrl.animateTo(mePoint); 
    mapCtrl.setZoom(17); 
} 
}

AddItemizedOverlay.java

public class AddItemizedOverlay extends ItemizedOverlay<OverlayItem> { 

    private ArrayList<OverlayItem> mapOverlays = new ArrayList<OverlayItem>(); 

    private Context context; 

    public AddItemizedOverlay(Drawable defaultMarker) { 
     super(boundCenterBottom(defaultMarker)); 
    } 

    public AddItemizedOverlay(Drawable defaultMarker, Context context) { 
     this(defaultMarker); 
     this.context = context; 
    } 

    @Override 
    public boolean onTouchEvent(MotionEvent event, MapView mapView) 
    { 

     if (event.getAction() == 1) { 
      GeoPoint geopoint = mapView.getProjection().fromPixels(
       (int) event.getX(), 
       (int) event.getY()); 
      // latitude 
      double lat = geopoint.getLatitudeE6()/1E6; 
      // longitude 
      double lon = geopoint.getLongitudeE6()/1E6; 

      Geocoder geocoder = new Geocoder(context, Locale.getDefault()); 
      String result = null; 
      try { 
       List<Address> list = geocoder.getFromLocation(lat, lon, 1); 
       if (list != null && list.size() > 0) { 
        Address address = list.get(0); 
        // sending back first address line and locality 
        result = address.getAddressLine(0) + ", " + address.getLocality(); 
        Toast.makeText(context, result, Toast.LENGTH_SHORT).show(); 
       } 
      } catch (IOException e) { 
       Log.e("Error", "Impossible to connect to Geocoder", e); 
      } 

     } 
     return false; 
    }

来源

2012-10-13 Dave Martin

你需要更清楚你想要达到的目标。 – Luis