您所要做的就是使用UserProfileChangeRequest

 mAuth.createUserWithEmailAndPassword(email, password).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if(task.isSuccessful()){
                    // Sign in success
                    FirebaseUser user = mAuth.getCurrentUser();

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

                    user.updateProfile(profileUpdates).addOnCompleteListener(new OnCompleteListener<Void>() {
        @Override
        public void onComplete(@NonNull Task<Void> task) {
            if (task.isSuccessful()) {
                Log.d(TAG, "User profile updated.");
             }
         }
     });


                }
    });

然后，要检索它，请在需要的地方使用它，

Then, to retrieve it, use this wherever required,

FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null) {
    // Name, email address etc
    String name = user.getDisplayName();
    String email = user.getEmail();
}

或者您可以创建自己的自定义节点.！

or you can create your own custom node.!

 String currentuser = FirebaseAuth.getInstance().getUid();

//save user node after successful signup.
      mFirebaseInstance.getReference("user").child(scurrentuser ).setValue(parameters);



    databaseReference = FirebaseDatabase.getInstance().getReference().child("user").child(currentuser );
    databaseReference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {


      for(DataSnapshot userSnapShot: dataSnapshot.getChildren()){
            User user = userSnapShot.getValue(User.class);
        }
        }