android - 如何从我的谷歌驱动器中获取文件和文件夹以在我的应用程序中显示它们？

Question

这是我的代码：

private void listfiles(Drive s )throws IOException
  {
  Toast.makeText(getApplicationContext(), "Inside listfiles now", Toast.LENGTH_LONG).show();
  List<File> result = new ArrayList<File>();
    Files.List request = s.files().list();
    Toast.makeText(getApplicationContext(), "list extracted", Toast.LENGTH_LONG).show();
    do {
        try {
             Toast.makeText(getApplicationContext(), "executing", Toast.LENGTH_LONG).show();

          FileList files = request.execute();

          Toast.makeText(getApplicationContext(), "Executed", Toast.LENGTH_LONG).show();
          result.addAll(files.getItems());
          request.setPageToken(files.getNextPageToken());
        } catch (IOException e) {
            Toast.makeText(getApplicationContext(), "Inside catch", Toast.LENGTH_LONG).show();
          System.out.println("An error occurred: " + e);

          request.setPageToken(null);
        }
      } while (request.getPageToken() != null &&
               request.getPageToken().length() > 0);
}

请告诉我如何做到这一点。我真的很需要它，我已经尝试了很长时间。