title: How to detect SearchView's back button press?
body: <p>I'm using a single activity to display SearchView as well as to display search results.  The search results is just a subset of items so the search acts as a filter.  Everything seems to work fine except that I can't figure out how to restore all items in the view when a back button of SearchView is clicked on.</p>
  
  <p>Or maybe there is another way to detect when a user navigates from search results to the previous view (which, in my case, is the same view).</p>
  
  <p>Thanks</p>