surfaceview倒计时显示

static final String tag = "GameView";
//声明GameThread类实例
GameThread gameThread;
public GameView(Context context) {
super(context);
// TODO Auto-generated constructor stub
//获取SurfaceHolder
SurfaceHolder surfaceHolder = getHolder();
//添加回调对象
surfaceHolder.addCallback(this);
//创建GameThread类实例
gameThread = new GameThread(surfaceHolder);
}
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
Log.v(tag, "surfaceChanged");
}
public void surfaceCreated(SurfaceHolder arg0) {
// TODO Auto-generated method stub
Log.v(tag, "surfaceCreated");
//启动gameThread
gameThread.start();
}
public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub
Log.v(tag, "surfaceDestroyed");
//通过结束run()函数的方法结束gameThread，详见GameThread类的定义
gameThread.run = false;
}
/**
* GameThread的定义
*
*/
class GameThread extends Thread {
SurfaceHolder surfaceHolder;
//run()函数中控制循环的参数。
boolean run = true;
public GameThread(SurfaceHolder surfaceHolder) {
this.surfaceHolder = surfaceHolder;
}
@Override
public void run() {
// TODO Auto-generated method stub
int i = 0;
while(run) {
Log.v(tag, "GameThread");
Canvas c = null;
try {
synchronized (surfaceHolder) {
//我们在屏幕上显示一个计数器，每隔1秒钟刷新一次
c = surfaceHolder.lockCanvas();
c.drawARGB(255, 255, 255, 255);
c.drawText("" + i++, 100, 100, new Paint());
Thread.sleep(1000);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (c != null) {
surfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
}