title: How to update Fragment's data when in backstack?
body: <p>I'm using a  single <code>Activity</code> and a lot of <code>Fragment</code>s. Right now when I get a response from an <code>IntentService</code> I use <code>Otto</code> Event bus to push the response's data to the <code>Fragment</code>.</p>
  
  <p>I have a case where I want to use the data I got from the server to  update the adapter of a <code>Fragment</code> (and therefore the <code>RecyclerView</code> which using the adapter).</p>
  
  <p>The problem is : user can move to another Fragment so how can I update previous Fragment state cause it's now unsubscribed from Event bus ?</p>