package com.hyzhou.surfaceviewdemo;import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(new MyView(this));}private  class MyView extends SurfaceView implements SurfaceHolder.Callback{/*** @param context*/SurfaceHolder holder;public MyView(Context context) {super(context);// TODO Auto-generated constructor stubholder=this.getHolder();holder.addCallback(this);}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stub
            }@Overridepublic void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stubnew Thread(new MyThread()).start();}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stub
            }class MyThread implements Runnable{/* (non-Javadoc)* @see java.lang.Runnable#run()*/@Overridepublic void run() {// TODO Auto-generated method stubCanvas canvas = holder.lockCanvas(null);//获取画布  Paint mPaint = new Paint();  mPaint.setColor(Color.BLUE);  canvas.drawRect(new RectF(40,60,80,80), mPaint); //前2个参数代表右上角坐标，后2个参数代表右下角坐标 holder.unlockCanvasAndPost(canvas);//解锁画布，提交画好的图像
}}}}