title: Get child ID from Firebase android
body: <p>I'm quite new to android development and I'm developing an android app with Firebase to get a person's name and adress. My database looks like this:</p>
  
  <pre><code>    Users
         id: user1
         id: user2
         id: user3
  
      Adresses
         id: adress1
         id: adress2
         id: adress3
  </code></pre>
  
  <p>I want to get 'id' from a user to get the corresponding adress, but I cannot seem to achieve it. Any ideas?</p>