firebaseAuth.getCurrentUser() return null DisplayName

Question

When I signIn with my google account and get the name with the getDisplayName(), my name appear correctly, but in the AuthStateListener doesn\'t.

here part of my cod

Answer 1

First let me say there's no need to downgrade the Gradle files or logout and login the user multiple times as stated by others just to display the user name. I've solved the issue a different way while still keeping the latest Gradle files and not having to log the user out and in multiple times. The issue with getDisplayName() is a very big one so I want to be as descriptive as possible for future users of Firebase to spare them the headache.

Here are the details of the solution:

Solution 1:

For users who authenticate(sign-in) with multiple providers such as Facebook, Google etc. and/or Email/Password that they created at sign-up:

The first thing you want to ensure is that when you have a user sign-up with the app for the first time you store their name of course to the database under their unique id. Which may look something like this:

// Method signature. Write current user's data to database
private void writeNewUser(String userId, String name, String email) {

DatabaseReference current_user_database = mDatabaseRef.child(userId);

current_user_database.child("username").setValue(name);

// Email here is not mandatory for the solution. Just here for clarity of the
// method signature
current_user_database.child("email").setValue(email);

}

After the user's name has been stored in your Firebase database and you have them sign into your app you can get their username something like this:

// Method that displays the user's username
    private void showUserName() {

        // Get instance of the current user signed-in
        mFirebaseUser = mAuth.getCurrentUser();

        // Check if user using sign-in provider account is currently signed in
        if (mFirebaseUser != null) {


            // Get the profile information retrieved from the sign-in provider(s) linked to a user
            for (UserInfo profile : mFirebaseUser.getProviderData()) {

                    // Name of the provider service the user signed in with (Facebook, Google, Twitter, Firebase, etc.)
                    String name = profile.getDisplayName();


// If displayName() is null this means that the user signed in using the email and password they created. This is the null issue we shouldn't get that we are gonna be solving below. 
                if(name == null){

                    mDatabaseRef.addValueEventListener(new ValueEventListener() {
                        @Override
                        public void onDataChange(DataSnapshot dataSnapshot) {

// Get the name the user signed-up with using dataSnapshot
                            String nameOfCurrentUser = (String) dataSnapshot.child("name").getValue();

// Set username we retrieved using dataSnapshot to the view
                            mTestUsernameTextView.setTitle(nameOfCurrentUser);

                        }

                        @Override
                        public void onCancelled(DatabaseError databaseError) {

                        }
                    });
                }

// If the name is not null that means the user signed in with a social Auth provider such as Facebook, Twitter, Google etc.
                if(name != null) {

                    // Set the TextView (or whatever view you use) to the user's name.
                    mTestUsernameTextView.setText(name);

                }

            } // End for

        } // End if

    }

That's it. Now you just call that method showUserName() or whatever your method is gonna be called inside your onCreate and hopefully this helps.

Solution 2:

For users who sign into your app using ONLY a social media service provider such as Facebook, Twitter, Google or whatever other option Firebase allows:

FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null) {
    for (UserInfo profile : user.getProviderData()) {
        // Id of the provider (ex: google.com)
        String providerId = profile.getProviderId();

        // UID specific to the provider
        String uid = profile.getUid();

        // Name, email address, and profile photo Url
        String name = profile.getDisplayName();
        String email = profile.getEmail();
        Uri photoUrl = profile.getPhotoUrl();
    };
}

That's it for solution 2, just follow the guidelines on Firebase for that and you should be good.

Here's a link to it if you're curious: Get a user's profile information

I truly hope this helps anyone struggling with the getDisplayName() issue.

Conclusion:

If your app only has Facebook, Twitter, Google or whatever else social media sign-in options Firebase provides then just simply calling getDisplayName()method on the currently signed in user should be enough to show their username.

Otherwise if your app allows the user to sign in using an email/password they created then make sure you got their name/username at sign-up so that you can use it later on to display it.

Answer 2

Edmund Johnson is right. This issue was introduced in Firebase Auth 9.8.0. A workaround includes downgrading to 9.6.1 or forcing 're-login' as the info is populated after the user logs out and logs back in. The problem is described in the Firebase issue

It has been reported as a bug to Firebase by one of the Firebase UI contributors - Alex Saveau.

Answer 3

This is a tricky one since it is not so clear in the documentation...

Check the getProviderData()

as defined here: https://firebase.google.com/docs/reference/android/com/google/firebase/auth/FirebaseUser#public-method-summary

You can iterate that List and it will have all the providers associated with that account, included a provider with the providerId = "google.com" with a display Name = YOUR_GOOGLE_USERNAME

let me know if you cannot make it work