flutter - How to keep user signed-in with 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

Yes you need to do the auth.currentUser() function in order to keep users authenticated and the best part is that this function will work even if the user is offline, which makes it very versatile.