if (videoCapturer != null) {
            videoCapturer.switchCamera(new CameraVideoCapturer.CameraSwitchHandler() {
                @Override
                public void onCameraSwitchDone(boolean b) {
                    Log.e(TAG, "switchCamera----->onCameraSwitchDone:" + b);
                }

                @Override
                public void onCameraSwitchError(String s) {
                    Log.e(TAG, "switchCamera----->onCameraSwitchError:" + s);
                }
            });
        }