Android SurviceView的觸控和軌跡球事件

SurfaceView 的觸控和軌跡球事件

1，改開始什么也沒有，當第一點擊的時候，圖標會出現在那個地方，然后點擊其它地方，圖標會在觸控的地方顯示

2，拖著圖標移動，到鼠標事件UP的地方繪畫停止

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獲取Android圖標

    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();//獲取觸控的X坐標
        y=event.getY();//獲取觸控的Y坐標
        Draw();
        return true;
    }

    @Override
    public boolean onTrackballEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        x=event.getX();//獲取軌跡的X坐標
        y=event.getY();//獲取軌跡的Y坐標
        Draw();
        return true;
    }
    private void Draw()
    {
        Canvas canvas=getHolder().lockCanvas();//定義Canvas，用SurfaceHolder的lockCanvas()方法鎖住畫布
        canvas.drawBitmap(bitmap, x, y,null);//繪畫
        getHolder().unlockCanvasAndPost(canvas);//解鎖畫布
    }
}
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(new MYSurFaceView(this));
}

}</pre> 

轉自：http://blog.csdn.net/rwyz1314/article/details/6788043