如何在android 10的特定位置从服务器下载任何文件？

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

public class DownloadTask extends AsyncTask<String, Integer, String> {
    private Context context;

    public DownloadTask(Context context) {
        this.context = context;
    }

    @Override
    protected String doInBackground(String... params) {
        String fileUrl = params[0];
        String fileName = params[1];
        String filePath = Environment.getExternalStorageDirectory().getPath() + "/" + fileName;

        try {
            URL url = new URL(fileUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.setDoOutput(true);
            connection.connect();

            int fileLength = connection.getContentLength();

            InputStream input = new BufferedInputStream(url.openStream());
            OutputStream output = new FileOutputStream(filePath);

            byte[] data = new byte[1024];
            long total = 0;
            int count;
            while ((count = input.read(data)) != -1) {
                total += count;
                publishProgress((int) (total * 100 / fileLength));
                output.write(data, 0, count);
            }

            output.flush();
            output.close();
            input.close();
        } catch (Exception e) {
            e.printStackTrace();
            return "Error: " + e.getMessage();
        }

        return "File downloaded to: " + filePath;
    }

    @Override
    protected void onPostExecute(String result) {
        Toast.makeText(context, result, Toast.LENGTH_SHORT).show();
    }
}

String fileUrl = "http://example.com/file.pdf";
String fileName = "file.pdf";
DownloadTask downloadTask = new DownloadTask(this);
downloadTask.execute(fileUrl, fileName);