根据开发文档提示集成扫码登录功能，DiffDevOAuth.auth 执行后无法生成二维码，但无法知道是哪些原因导致的，需要技术解答，提示相关日志如下： D/MicroMsg.SDK.GetQRCodeTask: doInBackground, url = https://open.weixin.qq.com/connect/sdk/qrconnect?appid=wx2b53884cee37612d&noncestr=1558517193831×tamp=1558517193831&scope=snsapi_userinfo,snsapi_login,snsapi_friend,snsapi_message&signature=c75d97c3bfc98e7f087fa89dced3dc64e1d92cad, time consumed = 220(ms) E/MicroMsg.SDK.GetQRCodeResult: resp errcode = -2 E/MicroMsg.SDK.GetQRCodeTask: onPostExecute, get qrcode fail, OAuthErrCode = OAuthErrCode:-1 MicroMsg.SDK.ListenerWrapper: onAuthFinish, errCode = OAuthErrCode:-1, authCode = null