Android基于mAppWidget实现手绘地图（九）–如何处理地图对象的touch事件

最新推荐文章于 2019-08-21 14:32:29 发布

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最新推荐文章于 2019-08-21 14:32:29 发布

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文章标签：移动开发

本文介绍如何在地图应用中设置OnMapTouchListener以响应用户的触控事件。通过示例代码展示了如何获取触控点的位置坐标及被触碰的地图对象ID，并进行简单的提示反馈。

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为了响应touch事件，需要设置OnMapTouchListener

示例：

private void initMapEventsListener()
{
       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();                     
                   Toast.makeText(BrowseMapDemoActivity.this, "Touched object " + objectId + " on layer" + layerId + ", x: " + mapX + " y: " + mapY, Toast.LENGTH_SHORT).show();
               }
           }
       });
   }