title: Load data into ListFragments
body: <p>I would like to load data from network into fragments. Inside the <code>Activity</code> I have a <code>ViewPager</code> and I am using a <code>FragmentPagerAdapter</code> to provide fragments to it. The problem is: </p>
  
  <p>How can I detect from activity, that ALL fragments from ViewPager are created and ready to show data. How can I inform fragments, that there is a data inside activity, that should be shown?</p>