title: Firebase Database add node to JSON tree for android
body: <p>I have the following structure in my Firebase Database JSON Tree:
  <a href="https://i.stack.imgur.com/oR7PX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oR7PX.png" alt="enter image description here"></a></p>
  
  <p>Now I have the <code>requests</code> node as the following in Android:</p>
  
  <p><code>DatabaseReference requestsNode</code></p>
  
  <p>How can I add another node <code>request2</code> with all the information-childs (date, destination, origin, ...) to the <code>requests</code> node? At the time of execution I do not know how many requests are already in the tree. So I do not know the increment <code>request&lt;number&gt;</code> number. </p>