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Question

My app works with Firebase Authentication. And when user starts app I need to add new user in Firebase, but I have 3 state:

1. There is no account
2. There is an account, but the user signed out
3. There is an account and the user signed in

For these 3 states, I must do the next:

1. create account in Firebase + log in my Database (at the same time) then sign in Firebase
2. sign in Firebase + log in my Database (at the same time)
3. log in my Database

How to make the first item correctly using Tasks? How to control errors?

I determine whether the signed user or not, using:

mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                user = firebaseAuth.getCurrentUser();
                if (user != null) {
                    // User is signed in
                    firebaseAuthUser = true;
                } else {
                    // User is signed out
                    firebaseAuthUser = false;
                }
            }
        };

Answer 1

You can use FirebaseUI-Android to gracefully handle those situations for you. It's really simple to implement! Please check it here .

You can check all FirebaseUI features here