GMail API获取Android中未配置的访问权限

Question

您好我正在尝试在我的Android应用中实施GMail API以在后台发送邮件。但我得到这样的回应。即使我在我的应用中启用了Gmail API权限。

{
      "code" : 403,
      "errors" : [ {
        "domain" : "usageLimits",
        "message" : "Access Not Configured. The API (Gmail API) is not enabled for your project. Please use the Google Developers Console to update your configuration.",
        "reason" : "accessNotConfigured",
        "extendedHelp" : "https://console.developers.google.com"
      } ],
      "message" : "Access Not Configured. The API (Gmail API) is not enabled for your project. Please use the Google Developers Console to update your configuration."
    }

我关注https://developers.google.com/gmail/api/quickstart/android进行整合。