使用NTLM下载Manager身份验证

Question

我想使用DownloadManager从我的大学互联网上下载文件。该网站使用Www-Authenticate：Negotiate，NTLM。

我使用下面的代码登录但它只适用于基本身份验证，那么如何让它与NTLM一起运行？

 DownloadManager manger = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
 DownloadManager.Request request =  new DownloadManager.Request(Uri.parse(url));
 request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);
 final String basicAuth = "Basic " + Base64.encodeToString(String.format("%s:%s","username","password").getBytes(), Base64.DEFAULT);
 request.addRequestHeader("Authorization" , basicAuth);
 request.setTitle("file.pdf");
 request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
 request.setVisibleInDownloadsUi(true);
 request.setDescription(String.format("Downloading %s", "file.pdf"));
 request.setDestinationInExternalPublicDir("MyGucFiles", "file.pdf");
 request.allowScanningByMediaScanner();
 manger.enqueue(request);