title: How to tell when the viewpager is done loading
body: <p>I am using a <code>ViewPager</code> in my app.</p>
  
  <p>My <code>ViewPager</code> is loading a lot of data and it is talking some time until it shows any content.
  My question is this: How can I tell that the ViewPager is done loading (about to show its content on screen) so I can remove the loading progressbar?</p>
  
  <p>Thanks!</p>