Android : get database id from row listview android

lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long rid) {

            lv.getAdapter().getItem(position);
            Intent intent = new Intent(getActivity()
                    .getApplicationContext(), RestaurantActivity.class);
            intent.putExtra("restaurant_id", restid);
            startActivity(intent);

        }
    });

lv.getAdapter().getItem(position) GIVES ME

{number_of_orders=1 offer, restaurant_id=5, distance=5.0 km, restaurantname=Brookside}

I want only restaurant_id value, i.e. 5.

How can i achieve this?