title: How to know when Fragment is closed to process infromation?
body: <p>So basically i am in Fragment A and i am calling Fragment B, in Fragment B i am processing some information (they are static) and click '<strong>Done</strong>' button that calls <code>popBackStack()</code></p>
  
  <p>Now again i am in Fragment A, but i need to know when user clicked Done in Fragment B, so i know that the  static information is ready.</p>
  
  <p>I guess answer will be some sort of Broadcast Receiver but i cannot get it work yet.</p>
  
  <p>Please give me some ideas?</p>
  
  <p>Thanks</p>