title: Knowing when list scrolling reaches the bottom
body: <p>I have a ListActivity which queries a web service for data.  I've implemented a paging system with the web service so only 25 rows get returned at a time.</p>
  
  <p>I'd like my ListActivity to work like so:  When the user scrolls to the bottom of the list, the ListActivity will query the web service for the next page of data.</p>
  
  <p>How can I tell if the user has scrolled to the bottom of the list?</p>