我使用：

spreadsheetService = new SpreadsheetService("cellmaster.com.au-v0.2");  
spreadsheetService.setHeader("Authorization", "Bearer " + accessToken);

而不是：

spreadsheetService = new SpreadsheetService("cellmaster.com.au-v0.2");  
spreadsheetService.setOAuth2Credentials(credential);

我还必须为刷新令牌添加代码。随着访问令牌即将到期。但刷新令牌可以正常运行。

also I had to add code for the refresh token. As the access token soon expires. But the refresh token works as you would expect.