How to force google account chooser after sign out in android firebase auth

Question

I am using Firebase Google Auth, signing out and logging in again will log in with last signed account. How can I make account chooser every time?

Answer 1

This part of Firebase Authentication with just a Google Sign In Button in place has given me a lot of nightmares, and if you have encountered the same issue, then I can assure that this answer will save you tons of hours!

Wherever you are implementing the Sign Out functionality, remember to use this line of code and you are good to go.

import com.google.android.gms.auth.api.signin.GoogleSignInOptions
import com.google.android.gms.auth.api.signin.GoogleSignIn


GoogleSignIn.getClient(this, GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN).build())
.signOut()

This is a kotlin code.

Answer 2

Firebase Auth Quickstart sample code provides the following few steps for sign out

Declare Globally these two variables

private GoogleSignInClient mGoogleSignInClient;
private GoogleSignInOptions gso;

Add these lines in onCreate method

gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();
mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

Now for signOut

private void signOut() {
        // Firebase sign out
        mAuth.signOut();

        // Google sign out
        mGoogleSignInClient.signOut().addOnCompleteListener(this,
                new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        updateUI(null);
                    }
                });
    }

It's easy, and it will work. Cheers!