code: @Override
  	public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
  		// what is the bottom item that is visible
  		int lastInScreen = firstVisibleItem + visibleItemCount;
  
  		boolean last = (lastInScreen == totalItemCount);
  
  		if(last && callback.hasMoreItems() && !callback.isLoading()) {
  			// Get next set...
  			callback.onGetNextSet();
  		}
  	}
docs: /* (non-Javadoc)
  @see android.widget.AbsListView.OnScrollListener#onScroll(android.widget.AbsListView, int, int, int)