title: Getting variable reference from fragment to activity
body: <p>I have an activity (MainActivity) that holds a Fragment (FragmentA) with an <code>ArrayList&lt;Uri&gt; array_list = new ArrayList&lt;Uri&gt;();</code>. 
  How can my MainActivity get a reference of that array_list?</p>
  
  <p>Now if you ask me why'd I want to get a reference of a variable of a fragment to an activity that holds that fragment, I'd say, I'm planning to get the items in array_list when I click the action button on my MainActivity. </p>
  
  <p>I'm using ViewPager. I don't have fragment id's.</p>