您使用了错误的端点.您将发布到 content 端点，而不是 file 端点.

You've used the wrong endpoint. Instead of the file endpoint, you're posting to the content endpoint.

所以

req.setEndpoint(' https://www.googleapis.com/upload/drive/v2/files ');

(对于v2 API)应为

should be (for the v2 API)

req.setEndpoint(' https://www.googleapis.com/drive/v2/文件');

或(对于v3 API)

or (for the v3 API)

req.setEndpoint(' https://www.googleapis.com/drive/v3/文件');

如果使用v3(您可能应该使用)，则json应该会因此更改

If you use v3 (which you probably should), your json should change thus

String jsonData ='{"name":"NewFolder"，"mimeType":"application/vnd.google-apps.folder"}';

String jsonData = '{"name":"NewFolder", "mimeType":"application/vnd.google-apps.folder"}';