package com.example.administrator.mystudent.surfaceView;

 import android.content.Context;

 import android.graphics.Canvas;

 import android.graphics.Color;

 import android.graphics.Paint;

 import android.graphics.Rect;

 import android.view.SurfaceHolder;

 import android.view.SurfaceView;

 import com.example.administrator.mystudent.R;

 /**

  * Created by Administrator on 2016/9/13.

  */

 public class TestSufaceView extends SurfaceView implements SurfaceHolder.Callback {

     private SurfaceHolder holder;

     private MyThread myThread;

     public TestSufaceView(Context context) {

         super(context);

         holder = this.getHolder();

         holder.addCallback(this);

         myThread = new MyThread(holder);//创建一个绘图线程

     }

     /**

      * @param holder 在创建时激发，一般在这里调用画图的线程

      */

     @Override

     public void surfaceCreated(SurfaceHolder holder) {

         myThread.isRun = true;

         myThread.start();

     }

     /**

      * @param holder

      * @param format

      * @param width

      * @param height 在surface的大小发生改变时激发

      */

     @Override

     public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

     }

     /**

      * @param holder 销毁时激发，一般在这里将画图的线程停止、释放

      */

     @Override

     public void surfaceDestroyed(SurfaceHolder holder) {

         myThread.isRun = false;

     }

     //线程内部类

     class MyThread extends Thread {

         private SurfaceHolder holder;

         public boolean isRun;

         public MyThread(SurfaceHolder holder) {

             this.holder = holder;

             isRun = true;

         }

         @Override

         public void run() {

             int count = 0;

             while (isRun) {

                 Canvas c = null;

                 try {

                     synchronized (holder) {

                         c = holder.lockCanvas();//锁定画布，一般在锁定后就可以通过其返回的画布对象Canvas，在其上面画图等操作了。

                         c.drawColor(Color.BLACK);//设置画布背景颜色

                         Paint p = new Paint(); //创建画笔

                         p.setColor(Color.WHITE);

                         Rect r = new Rect(100, 50, 300, 250);

                         c.drawRect(r, p);

                         c.drawText("这是第" + (count++) + "秒", 100, 310, p);

                         Thread.sleep(1000);//睡眠时间为1秒

                     }

                 }

                 catch(Exception e){

                     e.printStackTrace();

                     } finally

                 {

                     if (c != null)

                     {

                         holder.unlockCanvasAndPost(c);//结束锁定画图，并提交改变。

                         }

                     }

                 }

             }

     }

 }