Android TextureView轻弹

Question

我尝试过Romain Guy的TextureView示例代码（http://pastebin.com/J4uDgrZ8），效果很好。但是当我将lockCanvas（null）更改为lockCanvas（new Rect（x，y，x + 20，y + 20））时，示例开始闪烁。 似乎'lockCanvas（Rect）'不能很好地适用于TextureView或任何其他原因？

我在Android 4.0.3上使用摩托罗拉XOOM。 谢谢你的帮助！

我修改的代码如下：

 public void run() {
        float x = 0.0f;
        float y = 0.0f;
        float speedX = 5.0f;
        float speedY = 3.0f;

        Paint paint = new Paint();
        paint.setColor(0xff00ff00);

        while (mRunning && !Thread.interrupted()) {
            //final Canvas canvas = mSurface.lockCanvas(null);
            **final Canvas canvas = mSurface.lockCanvas(new Rect((int)x, (int)y,
                                                               (int)(x+20.0f), (int)(y+20.0f)));**  
            try {
                canvas.drawColor(0x00000000, PorterDuff.Mode.CLEAR);
                canvas.drawRect(x, y, x + 20.0f, y + 20.0f, paint);
            } finally {
                mSurface.unlockCanvasAndPost(canvas);
            }

            if (x + 20.0f + speedX >= mSurface.getWidth() || x + speedX <= 0.0f) {
                speedX = -speedX;
            }
            if (y + 20.0f + speedY >= mSurface.getHeight() || y + speedY <= 0.0f) {
                speedY = -speedY;
            }

            x += speedX;
            y += speedY;

            try {
                //Thread.sleep(15);
                  **Thread.sleep(1);**
            } catch (InterruptedException e) {
                // Interrupted
            }
        }

我仔细检查过，发现它是“Thread.sleep（1）”和“lockCanvas（Rect）”导致闪烁。当使用lockCanvas（null）时，sleep（1）就可以了。所以lockCanvas（Rect）不能像lockCanvas（null）??

那样快速刷新