Android基于mAppWidget实现手绘地图（十六）–处理一次触摸多个地图对象

最好的处理方式就是弹出一个对话框，将用户触摸过的控件罗列出来。你可以通过实现OnMapTouchListener来处理。

参考以下代码，实现上述功能：

mapWidget.setOnMapTouchListener(new OnMapTouchListener() {
   public void onTouch(MapWidget map, MapTouchedEvent event) {

       List objectTouchEvents = event.getTouchedObjectIds();

       // X coordinate of the touch in original image coordinates
       int mapX = event.getMapX();
       // Y coordinate of the touch in original image coordinates
       int mapY = event.getMapY();
       // X coordinate of the touch in screen coordinates
       int screenX = event.getScreenX();
       // Y coordinate of the touch in screen coordinates
       int screenY = event.getScreenY();

       if (objectTouchEvents.size() == 1) {
           ObjectTouchEvent objectTouchEvent = objectTouchEvents.get(0);

       // Id of the layer that the map object belongs to
           long layerId = objectTouchEvent.getLayerId();
       // Id of the map object that was touched.
           Object objectId = objectTouchEvent.getObjectId();

       // Handle single object touch event here
       } else if (objectTouchEvents.size() > 1) {
             List ids = new ArrayList();
             // Getting id's of the touched objects
             for (ObjectTouchEvent objectTouchEvent:objectTouchEvents){
                  // Id of the layer the object belongs to
                  long layerId = objectTouchEvent.getLayerId();
                  // Id of the object
                  Object objectId = objectTouchEvent.getObjectId();
                  ids.add(objectId);
             }

             // Show dialog with the list of objects here using ids
       } else {
             // Ignore touch event
       }
   }
});