Retrieve Random Object from Firebase Android

I want to be able to return random objects from this image and not just the first object (-Kci1vM1dVBYBcPW7QA) which returns as is already. I have inserted the code from my app where it is currently reading from. The variables one, two and three are currently reading the first object but I want them to be able to retrieve random objects.

public void displayDeals(){

    databaseReference.child("FruitDeals").child("bR4sR4flMkYFrw1SzuWA8hpOnY52").addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {

            deals_information = dataSnapshot.getValue(Deals_Information.class);
            one = deals_information.getDeal();
            two = deals_information.getPrice();
            three = deals_information.getAisleNum();
        }

        @Override
        public void onChildChanged(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onChildRemoved(DataSnapshot dataSnapshot) {

        }

        @Override
        public void onChildMoved(DataSnapshot dataSnapshot, String s) {
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            throw databaseError.toException();
        }
    });

}