在Android 5上使用SurfaceView的低FPS

Question

我正在使用SurfaceView做一个非常标准的绘图。 代码在大多数设备上运行平稳~60fps。但是 - 在Android 5上，我的表现非常糟糕。

有什么线索？

class MySurfaceView extends SurfaceView implements Runnable{

    Thread thread = null;
    SurfaceHolder surfaceHolder;
    volatile boolean running = false;


    public MySurfaceView(Context context) {
        super(context);
        surfaceHolder = getHolder();
    }

    public void onResumeMySurfaceView(){
        running = true;
        thread = new Thread(this);
        thread.start();
    }

    public void onPauseMySurfaceView(){
        boolean retry = true;
        running = false;
        while(retry){
            try {
                thread.join();
                retry = false;
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void run() {
        while(running){
            if(surfaceHolder.getSurface().isValid()){
                Canvas canvas = surfaceHolder.lockCanvas();
                // drawing
                surfaceHolder.unlockCanvasAndPost(canvas);
            }
        }
    }
}