android移动view

import android.app.Activity;
import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.*;

public class Mian extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        MyView my=new MyView(this);
        setContentView(my);
    }
}
class MyView extends SurfaceView implements SurfaceHolder.Callback,Runnable
{
    SurfaceHolder holder;
    Rect rect;//建立类
    public MyView(Context context)
    {
        super(context);
        holder = this.getHolder();//获取SurfaceHolder对象实例
        holder.addCallback(this);//添加callback接口
        setFocusable(true);
        rect=new Rect(150, 150);
        Thread t=new Thread(rect);
        t.start();
    }
    @Override
  //当SurfaceView尺寸改变时调用
    public void surfaceChanged(SurfaceHolder holder, int format, int width,int height){}
    @Override
  //当SurfaceView建立时调用
    public void surfaceCreated(SurfaceHolder holder)
    {
        new Thread(this).start();//启动新的线程
    }
  //当SurfaceView销毁时调用
    @Override
    public void surfaceDestroyed(SurfaceHolder holder){}
    @Override
    public synchronized void  run() {
        // TODO Auto-generated method stub
        while(true){
            Canvas canvas = holder.lockCanvas(null);//SurfaceHolder锁定并得到canvas对象
            canvas.drawColor(Color.WHITE);
            this.drawGraphics(canvas);
            holder.unlockCanvasAndPost(canvas);//解锁画布，提交画好的图像
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    public void drawGraphics(Canvas canvas){
        Paint mPaint = new Paint();
        mPaint.setStyle(Paint.Style.FILL);//设置为实心
        mPaint.setColor(Color.RED);
        mPaint.setAntiAlias(true);//设置抗锯齿
        this.draw(canvas, mPaint);
    }
    public void draw(Canvas canvas,Paint p){
        canvas.drawCircle(100, rect.y, 50, p);//画圆
    }
}
class Rect implements Runnable{ 
   //矩形类
    int x;
    int y;
    int speed=10;
    public Rect(int x,int y){
        this.x=x;
        this.y=y;
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        while(true){
            y+=speed;
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

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