Do I need Firebase to use Google Sign In in my Android app?

Question

I have implemented everything I needed to implement to use Google Sign In (at least I think I have).

I have my Google Sign In button, I can click it, it prompts me to select an account but I always get error 12500 (Login Failed).

I've been looking around for a solution to this issue and have heard a lot about SHA-1 and Firebase. Not sure what Firebase is, nor is it mentioned in any of the following documentation:

https://developers.google.com/identity/sign-in/android/sign-in

https://developers.google.com/identity/sign-in/android/start-integrating

Do I absolutely need Firebase to get Google Sign In to work? If so, what do I have to do? If not, what else could be causing my 12500 error?

user_3792103 · Answer

Definitely, you can implement Google sign in without using Firebase. You can check the Google sign in implementation here (without Firebase) in my first commit to this project. Look for file JNLoginActivity.java :-

https://github.com/swapniljain23/Jinshashan/commit/d7808bb1a109f0827fe4bbce2a58bbd96d210467

I hope, it helps!!

https://github.com/swapniljain23/Jinshashan/commit/d7808bb1a109f0827fe4bbce2a58bbd96d210467

I hope, it helps!!

user_5593651 · Answer

To answer your question: no, you do not need firebase to get google login to work for your application. Firebase is a popular no-sql backend for mobile apps that happens to fully integrate google oauth2, but you should be able to to do it without firebase.

As TheWanderer suggested, check out this post

Do I need Firebase to use Google Sign In in my Android app?

2 Answers