title: Android - RecyclerView spacing between items in a Grid
body: <p>In my Android app I'm using a <code>RecyclerView</code> to display items in a grid by using a <code>GridLayoutManager</code>. 
  In a GridView, in order to specify the spacing between elements, I would set the <strong>horizontalSpacing</strong> and <strong>verticalSpacing</strong> properties.</p>
  
  <p>So, how can I do the same on a <code>RecyclerView</code>?</p>