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

<SPAN style="COLOR: #000000">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));
    }
}</SPAN>