custom_firebase_child

//akses ke (table) users
database.child("users")
        .child(uid) //buat child (primary key berdasar uid auth)
        .setValue(users)    //simpan data di dalamnya
        .addOnSuccessListener(new OnSuccessListener<Void>() {
            @Override
            public void onSuccess(Void aVoid) {
                Toast.makeText(CreateUserActivity.this, "Data user berhasil disimpan", Toast.LENGTH_SHORT).show();
            }
        });