title: I want to update single value in firebase database
body: <p>i have use RecyclerView and Adapter and inflte item_list of adapter, each row has one like button and text that store likes value i want to update value when user click like button.</p>
  
  <p><img src="https://i.stack.imgur.com/2meUZ.png" alt=""></p>
  
  <p><img src="https://i.stack.imgur.com/vdyv5.png" alt="here is my firebase database structure"><a href="https://i.stack.imgur.com/vdyv5.png" rel="nofollow noreferrer">2</a></p>