How to list the registered users names in Android (Firebase)?

Question

I am new to android and just learned to create a users profile like facebook or instagram, currently I have registered four users with email/password and in database am storing

Answer 1

Firebase is NoSql. You need to retrieve all users from myRef.child("users") and apply iterator to get names of all users.

Answer 2

To display those names, please use this code:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference usersdRef = rootRef.child("users");
ValueEventListener eventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            String name = ds.child("name").getValue(String.class);
            Log.d("TAG", name);
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {}
};
usersdRef.addListenerForSingleValueEvent(eventListener);

And the output will be in this case all your user names.