android Camera 如何判断当前使用的摄像头是前置还是后置

android.hardware.Camera.CameraInfo info =            new android.hardware.Camera.CameraInfo();     android.hardware.Camera.getCameraInfo(cameraId, info);     if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {        //前置摄像头     } else {  // 后置摄像头             }