如何设置Android本地文件夹加载图片的进度条值？

public class LoadImageTask extends AsyncTask<String, Integer, Bitmap> {
    private ProgressBar progressBar;
    private ImageView imageView;

    public LoadImageTask(ProgressBar progressBar, ImageView imageView) {
        this.progressBar = progressBar;
        this.imageView = imageView;
    }

    @Override
    protected Bitmap doInBackground(String... params) {
        String imagePath = params[0];
        Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
        return bitmap;
    }

    @Override
    protected void onPostExecute(Bitmap result) {
        imageView.setImageBitmap(result);
    }

    @Override
    protected void onProgressUpdate(Integer... values) {
        int progress = values[0];
        progressBar.setProgress(progress);
    }
}

ProgressBar progressBar = findViewById(R.id.progress_bar);
ImageView imageView = findViewById(R.id.image_view);

LoadImageTask task = new LoadImageTask(progressBar, imageView);
task.execute("path/to/image.jpg");