flutter - 如何让用户登录 Google

Question

I have used Google Sign In to authenticate users with Firebase Auth, and I successfully get back my Firebase User. I want to keep the user authenticated, when they come back to the app. How can I do the same?

Answer 1

Users already stay authenticated. After you restart the app, Firebase reads the credentials from disk, and refreshes the user's token. Since this requires a roundtrip to the server, it happens asynchronously. So be sure to await _auth.currentUser() to get notified of the user's status.

Whenever I'm wondering how to do such things, I look at the FlutterFire sample app . This specific line can be found here .

Answer 2

是的，您需要执行auth.currentUser()函数以保持用户身份验证，最好的部分是即使用户离线，该函数也能工作，这使得它非常通用。