SurfaceView的简单使用

 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。
                         }
                     }
                 }
             }

     }
 }