title: How to update a listview item via adapter
body: <p>It's easy to <code>remove</code>, <code>add</code> and <code>insert</code> an item from the listview adapter object, but I don't think I see a direct method to <code>update</code> an item in the listview adapter. Obviously, I could simply replace via remove/add, but I want to make sure I'm not missing something obvious. 
  Right now, I'm simply updating the underlying Item Array and refresh the entire listview by recreating/assigning the adapter (probably also not very elegant).
  I hope the question is clear enough.</p>