Android SurviceView的触控和轨迹球事件

SurfaceView 的触控和轨迹球事件

1，改开始什么也没有，当第一点击的时候，图标会出现在那个地方，然后点击其它地方，图标会在触控的地方显示

2，拖着图标移动，到鼠标事件UP的地方绘画停止

import android.app.Activity;  import android.content.Context;  import android.graphics.Bitmap;  import android.graphics.BitmapFactory;  import android.graphics.Canvas;  import android.os.Bundle;  import android.view.MotionEvent;  import android.view.SurfaceView;    public class Touch_TrackActivity extends Activity {      /** Called when the activity is first created. */   class MYSurFaceView extends SurfaceView{         float x;         float y;         Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.chart_pie);//用Bitmap获取Android图标             public MYSurFaceView(Context context) {     super(context);     setFocusable(true);//使用Key event,setFocusable(true)可以聚焦     // TODO Auto-generated constructor stub    }        @Override    public boolean onTouchEvent(MotionEvent event) {     // TODO Auto-generated method stub     x=event.getX();//获取触控的X坐标     y=event.getY();//获取触控的Y坐标     Draw();     return true;    }        @Override    public boolean onTrackballEvent(MotionEvent event) {     // TODO Auto-generated method stub     x=event.getX();//获取轨迹的X坐标     y=event.getY();//获取轨迹的Y坐标     Draw();     return true;    }    private void Draw()    {     Canvas canvas=getHolder().lockCanvas();//定义Canvas，用SurfaceHolder的lockCanvas()方法锁住画布     canvas.drawBitmap(bitmap, x, y,null);//绘画     getHolder().unlockCanvasAndPost(canvas);//解锁画布    }   }      @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(new MYSurFaceView(this));      }  }