by method setFlash() no flash action with this demo?

[JinhuangWang]

private View.OnClickListener flashOnOnClickListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (cameraView.getFlash() != CameraKit.FLASH_ON) {
            cameraView.setFlash(CameraKit.FLASH_ON);
            updateInfoText();
        }
    }
};

private View.OnClickListener flashOffOnClickListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (cameraView.getFlash() != CameraKit.FLASH_OFF) {
            cameraView.setFlash(CameraKit.FLASH_OFF);
            updateInfoText();
        }
    }
};