How do I persist authentication state in my Kotlin firebase app?

Question

I am building a kotlin app using FirebaseAuth and I want to add some custom rules to keep the user signed in for a time even if they are not using the app. All I could find in the docs related to this was for Web applications. https://firebase.google.com/docs/auth/web/auth-state-persistence

Is there anything like this in the docs for Android?

If not, is there a way I can get that functionality?

I was considering using SharedPreferences to store authentication state but I get the feeling there is a better way.

Could you please check this [thread](https://stackoverflow.com/questions/50885891/one-time-login-in-app-firebaseauth) and see if it helps. — Marc Anthony B, Apr 14 '22 at 02:52
Is your auth state not persisted? Are explicitly signing out the user? — Alex Mamo, Apr 14 '22 at 06:55
@MarcAnthonyB Thank you! That thread is actually very helpful! — Dylon Jaynes, Apr 14 '22 at 14:38
@AlexMamo No, I am not explicitly signing out the user yet. Do users stay logged in permanently by default? — Dylon Jaynes, Apr 14 '22 at 14:39

Ömer Seyfettin Yavuzyiğit · Answer 1 · 2022-04-14T10:52:07.500

3

public override fun onStart() {
super.onStart()
        val user = firebaseAuth.currentUser
        if (user != null) {
            //startActivity
        } else {
            Timber.i("Error")
        }
    }

edited Apr 14 '22 at 10:52

answered Apr 14 '22 at 10:39

Ömer Seyfettin Yavuzyiğit

687
7
10

1

https://firebase.google.com/docs/auth/android/google-signin?authuser=0 – Ömer Seyfettin Yavuzyiğit Apr 14 '22 at 10:41
If your code worked please confirm. – Ömer Seyfettin Yavuzyiğit Apr 15 '22 at 09:30

score 3 · Answer 2 · answered Jun 21 '22 at 16:34

3

You dont need to set it. Firebase currentuser stay there until you uninstall the application itself or log out. You just need to check whether the currentuser exist or not at the start of activity

Val currentUser = Firebase.auth.CurrentUser
if(currentUser1=null){
   Do something....
}

answered Jun 21 '22 at 16:34

lelestacia

201
2
9

This solved it! Even easier to test it out: if (Firebase.auth.CurrentUser == null) {print('user not logged in');} else {print('user is logged in');} – user395980 Nov 05 '22 at 09:54

score 0 · Accepted Answer · answered Apr 26 '22 at 17:33

0

So, I was not aware that firebase users stay signed in until logged out explicitly. Understanding this solved my problem as I didn't have to write code to handle keeping the user signed in.

answered Apr 26 '22 at 17:33

Dylon Jaynes

166
11

How do I persist authentication state in my Kotlin firebase app?

3 Answers3