如何在Android OpenCv中加载cascadeClassifier？

implementation project(':opencv')

OpenCVLoader.initDebug();

CascadeClassifier cascadeClassifier = new CascadeClassifier();
try {
    InputStream is = getAssets().open("cascade_file.xml");
    File cascadeDir = getDir("cascade", Context.MODE_PRIVATE);
    File cascadeFile = new File(cascadeDir, "cascade_file.xml");
    FileOutputStream os = new FileOutputStream(cascadeFile);
    byte[] buffer = new byte[4096];
    int bytesRead;
    while ((bytesRead = is.read(buffer)) != -1) {
        os.write(buffer, 0, bytesRead);
    }
    is.close();
    os.close();
    cascadeClassifier.load(cascadeFile.getAbsolutePath());
} catch (IOException e) {
    e.printStackTrace();
}

Mat image = Imgcodecs.imread("image_file.jpg");
Mat grayImage = new Mat();
Imgproc.cvtColor(image, grayImage, Imgproc.COLOR_BGR2GRAY);
MatOfRect faces = new MatOfRect();
cascadeClassifier.detectMultiScale(grayImage, faces);
Rect[] facesArray = faces.toArray();
for (Rect rect : facesArray) {
    Imgproc.rectangle(image, rect.tl(), rect.br(), new Scalar(0, 255, 0), 3);
}