title: Download Manager returns unsuccessful download on Android 9.0 NetworkSecurityConfig: No Network Security Config specified, using platform default
body: <p>I am using Download Manager to download file from the internet. The download complete successfully in Android 6, 8.1, but not in Android 9.0     </p>
  
  <pre><code>DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
  request.setDescription("Downloading...");
  request.setTitle(nameOfFile);
  request.setMimeType("application/pdf");
  request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS + "/CPG", nameOfFile);
  request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
  manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
  queueId = manager.enqueue(request);
  </code></pre>