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。
}
}
}
} }
}