1 package com.example.administrator.mystudent.surfaceView;  2   3 import android.content.Context;  4 import android.graphics.Canvas;  5 import android.graphics.Color;  6 import android.graphics.Paint;  7 import android.graphics.Rect;  8 import android.util.AttributeSet;  9 import android.view.SurfaceHolder; 10 import android.view.SurfaceView; 11  12 /** 13  * Created by Administrator on 2016/9/13. 14  */ 15 public class TestSufaceView extends SurfaceView implements SurfaceHolder.Callback { 16  17     private SurfaceHolder holder; 18     private MyThread myThread; 19  20     public TestSufaceView(Context context) { 21         super(context, null); 22     } 23  24     public TestSufaceView(Context context, AttributeSet attrs) { 25         super(context, attrs); 26  27         holder = this.getHolder(); 28         holder.addCallback(this); 29         myThread = new MyThread(holder);//创建一个绘图线程 30  31     } 32  33  34     /** 35      * @param holder 在创建时激发，一般在这里调用画图的线程 36      */ 37     @Override 38     public void surfaceCreated(SurfaceHolder holder) { 39  40         myThread.isRun = true; 41         myThread.start(); 42     } 43  44     /** 45      * @param holder 46      * @param format 47      * @param width 48      * @param height 在surface的大小发生改变时激发 49      */ 50     @Override 51     public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 52  53     } 54  55     /** 56      * @param holder 销毁时激发，一般在这里将画图的线程停止、释放 57      */ 58     @Override 59     public void surfaceDestroyed(SurfaceHolder holder) { 60  61         myThread.isRun = false; 62     } 63  64     //线程内部类 65     class MyThread extends Thread { 66         private SurfaceHolder holder; 67         public boolean isRun; 68  69         public MyThread(SurfaceHolder holder) { 70             this.holder = holder; 71             isRun = true; 72         } 73  74         @Override 75         public void run() { 76             int count = 0; 77             while (isRun) { 78                 Canvas c = null; 79                 try { 80                     synchronized (holder) { 81                         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。 82                         c.drawColor(Color.BLACK);//设置画布背景颜色 83                         Paint p = new Paint(); //创建画笔 84                         p.setColor(Color.WHITE); 85                         Rect r = new Rect(100, 50, 300, 250); 86                         c.drawRect(r, p); 87                         c.drawText("这是第" + (count++) + "秒", 100, 310, p); 88                         Thread.sleep(1000);//睡眠时间为1秒 89                     } 90                 } 91                 catch(Exception e){ 92                     e.printStackTrace(); 93                     } finally 94                 { 95                     if (c != null) 96                     { 97                         holder.unlockCanvasAndPost(c);//结束锁定画图，并提交改变。 98                         } 99                     }100                 }101             }102 103     }104 }