title: ListView scroll - one by one
body: <p>I have a ListView that must display 4 items at a time. And I must scroll one item, one by one.</p>
  
  <p>After user scrolls the ListView, I must readjust the scroll to fit 4 items. I mean, I can´t show an item by half.</p>
  
  <p>Another question, is there any way to get the current ListView scrollY offset? Because the listView.getScrollY() method is from View, but not the Scroller object inside the ListView.</p>