title: How to add margins to a RecyclerView for the last element?
body: <p>I several screens that use <code>RecyclerView</code> and also has a small <code>Fragment</code> that is on top of the <code>RecyclerView</code>.  When that <code>Fragment</code> is displayed I'd like to make sure I can scroll to the bottom of the <code>RecyclerView</code>.  The <code>Fragment</code> isn't always displayed.  If I used margins on the <code>RecyclerView</code> I'd need to dynamically remove and add them when the <code>Fragment</code> is displayed.  I could add margins onto the last item in the list, but that is also complicated and if I load more things later (ie pagination) I'd have to strip off those margins again.</p>
  
  <p>How would I dynamically add or remove margins to the view?  What are some other options to solve this?</p>