title: Get the time in ms for which a view was opened for ViewPager
body: <p>I have a List view and a ViewPager with few items in list. </p>
  
  <p>List:<br>
  A<br>
  B<br>
  C<br>...(n)</p>
  
  <p>ViewPager:</p>
  
  <p>A &lt;-swipe-> B &lt;-swipe-> C... (n)</p>
  
  <p>I want to get time in ms the user spent on each view (A/B/C) before swiping left/right on the next view or going back to list view.</p>
  
  <p>Any hint or pointers help appreciated. Thanks.</p>