要获取Android FirebaseVisionImage相机方向，可以使用以下代码示例：

// 获取相机方向
private int getCameraOrientation() {
    CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
    try {
        String cameraId = cameraManager.getCameraIdList()[0];
        CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraId);
        int sensorOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
        int frontCamera = characteristics.get(CameraCharacteristics.LENS_FACING);
        int rotation = getWindowManager().getDefaultDisplay().getRotation();

        // 计算最终方向
        int degrees = 0;
        switch (rotation) {
            case Surface.ROTATION_0:
                degrees = 0;
                break;
            case Surface.ROTATION_90:
                degrees = 90;
                break;
            case Surface.ROTATION_180:
                degrees = 180;
                break;
            case Surface.ROTATION_270:
                degrees = 270;
                break;
        }

        int result;
        if (frontCamera == CameraCharacteristics.LENS_FACING_FRONT) {
            result = (sensorOrientation + degrees) % 360;
            result = (360 - result) % 360;  // 前置摄像头需要镜像翻转
        } else {
            result = (sensorOrientation - degrees + 360) % 360;
        }

        return result;
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }

    return 0;
}

// 创建FirebaseVisionImage对象
private FirebaseVisionImage createFirebaseVisionImage(byte[] data, int rotation) {
    // 根据相机方向创建FirebaseVisionImageMetadata
    FirebaseVisionImageMetadata metadata = new FirebaseVisionImageMetadata.Builder()
            .setWidth(480)
            .setHeight(640)
            .setFormat(FirebaseVisionImageMetadata.IMAGE_FORMAT_NV21)
            .setRotation(rotation)
            .build();

    // 创建FirebaseVisionImage对象
    return FirebaseVisionImage.fromByteArray(data, metadata);
}

在使用相机获取图像数据时，可以调用getCameraOrientation()方法获取相机方向，并将其作为参数传递给createFirebaseVisionImage()方法来创建FirebaseVisionImage对象。