How to set users name in firebase realtime-database

Question

When i am creating new account its name equals users UID is there anyway to change it to custom name?

My code

mAuth.createUserWithEmailAndPassword(Email, Password)
    .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if(task.isSuccessful()){
                User user = new User(Name, LastName, Email);
                curentUser = Name + " " + LastName;

                FirebaseDatabase.getInstance().getReference("No server")
                        .child(FirebaseAuth.getInstance().getCurrentUser().getUid())
                        .setValue(user).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        if(task.isSuccessful()){
                            Toast.makeText(MainActivity.this, "User has been registered successfully!", Toast.LENGTH_LONG).show();

                        }else{
                            Toast.makeText(MainActivity.this,"Failed to register! try again!", Toast.LENGTH_LONG).show();
                        }
                    }
                });
            }else{
                Toast.makeText(MainActivity.this,"Failed to register! try again!", Toast.LENGTH_LONG).show();
            }
        }
    });

How it looks like

Answer 1

You can't change the key of an existing value in Firebase Realtime Database without reading the value, write it under a new key, and delete the old one.

That being said, you chose the key of the user object yourself:

FirebaseDatabase
  .getInstance().getReference()
  .child(FirebaseAuth.getInstance().getCurrentUser().getUid())
  .setValue(user)

The child method contains the key for the value you set in setValue. And you use the current user's UID for this.

You can change this to whatever value you like. For example, you could the user's email as a key (see reference for current user object):

.child(FirebaseAuth.getInstance().getCurrentUser().getEmail())

Note: See the comment from @puf below, you might want to encode an email address when using as a key.