求助：关于画三角行的问题
我想随机画N个三角形，帧率60fs，就重写了SurfaceView，但是屏幕会不停的闪，中途按返回建，还会出现force close，请各位高手帮忙看一下（不过我现在已经用新的方法实现了）
public class MyView extends SurfaceView implements SurfaceHolder.Callback {

private SurfaceHolder holder;
public MyView(Context context) {
super(context);
holder = this.getHolder();//获取holder
holder.addCallback(this);
}

public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// TODO Auto-generated method stub

}

public void surfaceCreated(SurfaceHolder holder) {
new Thread(new MyThread()).start();

}

public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub

}

class MyThread implements Runnable {
public void run() {
Paint mPaint = new Paint();
mPaint.setStyle(Style.FILL);
mPaint.setAntiAlias(true);
Random random = new Random(System.currentTimeMillis());
Canvas canvas = null;
int rotate = 0;

while (rotate < 500) {
//Date curr = new Date();
rotate=rotate+1;
try{
canvas = holder.lockCanvas();//获取canvas
mPaint.setColor(new Color().rgb(random.nextInt(255), random.nextInt(255), random
.nextInt(255)));
mPaint.setStrokeWidth(2);/*设置paint的外框宽度*/
Path mPath = new Path();
mPath.moveTo(random.nextInt(450), random.nextInt(600));
mPath.lineTo(random.nextInt(300), random.nextInt(400));
mPath.lineTo(random.nextInt(200), random.nextInt(300));
mPath.close();
canvas.drawPath(mPath, mPaint);

Thread.sleep(Math.max(0, 17-(new Date().getTime()))); //休眠
}catch (InterruptedException e) {
e.printStackTrace();
}finally{
holder.unlockCanvasAndPost(canvas); //解锁canvas，提交画好的图像
}
}
}
}
}

[解决办法]
SurfaceView是frontbuffer和backbuffer交替显示的，每次Post交替一次，按你这样写两个Buffer是不一样的所有奇数的Post画在一起，偶数的画在另外个Buffer，运行起来就会闪了。延时长一点就看的出来了。
应用上加缓冲就可以了。

Java code

          //加缓冲      private Paint[] paints=new Paint[2];          private Path[]  paths=new Path[2];                    //这样更新canvas          paints[0]=paints[1];          paints[1]=mPaint;             paths[0]=paths[1];          paths[1]=mPath;                 if(paints[0]!=null) //画的时候还有画一次的            canvas.drawPath(paths[0], paints[0]);          canvas.drawPath(mPath, mPaint);