我有一个类似的问题，用户信息没有更新，直到用户重新认证。我解决了这个问题，也保存在我的firebase数据库中的信息。对我来说，这是有意义的，因为我希望用户能够获得其他用户的基本信息。
我的代码最终看起来像这样。当创建或修改帐户时，我调用了“users/{uid}”端点并更新了那里的对象。从这里开始，我使用GreenRobot EventBus将我的新User对象发送给订阅的人，以便在屏幕上更新它。

private FirebaseUser firebaseUser;

public void createUser(String email, String password, final User user, Activity activity, final View view) {
    FirebaseAuth.getInstance().createUserWithEmailAndPassword(email, password)
        .addOnCompleteListener(activity, new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                Log.d(TAG, "createUserWithEmail:onComplete:" + task.isSuccessful());

                // If sign in fails, display a messsage to the user. If sign in successful
                // the auth state listener will be notified and logic to handle
                // signed in user can be handled in the listener
                if (!task.isSuccessful()) {
                    Snackbar.make(view, task.getException().getLocalizedMessage(), Snackbar.LENGTH_SHORT).show();
                } else {
                    firebaseUser = task.getResult().getUser();

                    UserProfileChangeRequest profileUpdates = new UserProfileChangeRequest.Builder()
                        .setDisplayName(user.displayName)
                        .build();
                    firebaseUser.updateProfile(profileUpdates);
                    updateDatabase(user);

                    EventBus.getDefault().post(new LoginEvent());
                }
            }
        });
}

public boolean updateDatabase(User user) {
    if (firebaseUser == null) {
        Log.e(TAG, "updateDatabase:no currentUser");
        return false;
    }

    return userReference.setValue(user).isSuccessful();
}

数据库监视器的设置是这样完成的。请注意，您需要确保在用户注销时删除侦听器，并在用户登录时添加新侦听器。

protected void setupDatabaseWatcher() {
    String uid = firebaseUser.getUid();

    userReference = FirebaseDatabase.getInstance().getReference("users/" + uid);
    userReference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            // This method is called once with the initial value and again
            // whenever data at this location is updated.
            User user = dataSnapshot.getValue(User.class);
            Log.d(TAG, "Value is: " + user);

            EventBus.getDefault().post(new UserUpdateEvent(user));
        }

        @Override
        public void onCancelled(DatabaseError error) {
            // Failed to read value
            Log.w(TAG, "Failed to read value.", error.toException());
        }
    });
}

使用这个简单的代码：

UserProfileChangeRequest profileUpdates = new UserProfileChangeRequest.Builder()
    .setDisplayName(newName)
    .build();