SurfaceView的简单使用 

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

 

posted @ 2016-09-13 11:21  点滴之水  阅读(681)  评论(0)    收藏  举报