How to correctly structure Java code to save values under named key to Firebase Realtime Database

JustReflektor :

I am currently writing a part of an application where a user scans a QR code which holds the value of the user UID. Upon scanning this, I want to create a new key in my Firebase Realtime database containing the information related to the user with that UID called userInformation. Below is a an example of the format I wish the values to be stored as:

Currently it is being stored without the userInfromations key, it is only being stored with the UID, like so:

Here is the related code:

case FirebaseVisionBarcode.TYPE_TEXT:
            {
                final DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
                userInformations = new ArrayList<>();
                DatabaseReference username = ref.child(item.getRawValue()).child("username");
                DatabaseReference dateOfBirth = ref.child(item.getRawValue()).child("dateOfBirth");

                username.addListenerForSingleValueEvent(new ValueEventListener() {
                    @Override
                    public void onDataChange(DataSnapshot dataSnapshot) {
                        String username = dataSnapshot.getValue(String.class);
                        //Toast.makeText(getApplicationContext(),username, Toast.LENGTH_LONG).show();

                        //it will create a unique id and we will use it as the Primary Key for our UserInfo
                        String id1 = ref.push().getKey();

                        //creating an UserInfo Object
                        UserInformation userInformation = new UserInformation(id1, username);

                        //Saving the Artist
                        ref.child(id1).setValue(userInformation);

                        //displaying a success toast
                        Toast.makeText(getApplicationContext(), username + " has been added", Toast.LENGTH_LONG).show();
                    }

I realize also that by changing:

final DatabaseReference ref = FirebaseDatabase.getInstance().getReference();

to:

DatabaseReference ref = FirebaseDatabase.getInstance().getReference("userInformations");

I am able to get the key named userInformations, but it no longer saves the value for the userInformationName like below:

At the moment I am just unsure how to structure my code to get both of these things.

Alex Mamo :

According to the last comemnts, to achieve a schema that looks like this:

rootRef
  |
  --- userInformations
         |
         --- pushId
              |
              --- "userInformationId: "-LXO5 ... H-o3-P" 
              |
              --- "userInformationName: "[email protected]"

Please use the following lines of code:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference userInformationsRef = rootRef.child("userInformations");
String userInformationId = userInformationsRef.push().getKey();
String userInformationName = "[email protected]";
UserInformation userInformation = new UserInformation(userInformationId, userInformationName);
userInformationsRef.child(userInformationId).setValue(userInformation);