title: Android Firebase, Get position of key in node
body: <p>I want to get data according to user's ranking. First order by user's points and get users position in node. But I can't think of the way to implement this.</p>
  
  <p>First This is my firebase 'users' node
  <a href="https://i.stack.imgur.com/QQ66w.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QQ66w.png" alt="enter image description here"></a></p>
  
  <p>Maybe It will be like 'databaseRef.child("users").orderByChild("points")...'
  I don't know from here. </p>
  
  <p>ps. It's not get nth item. It's 'where is the item' ( item's nth )</p>
  
  <p>Thank you!</p>