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 }
