1.在camerasetting里面添加摄像机前后切换及闪光灯的开启。

        //前后摄像头切换
        public  void  SwitchCameraDirection(){
            CameraDevice.Instance.Stop ();
            CameraDevice.Instance.Deinit ();
            //转换为前置摄像头
            CameraDevice.Instance.Init (CameraDevice.CameraDirection.CAMERA_FRONT);
            CameraDevice.Instance.Start ();
        }

        //打开闪光灯
        public void FlashTourch(bool ON){
            CameraDevice.Instance.SetFlashTorchMode (ON);
        }