title: RecyclerView GridLayoutManager with full width header
body: <p>I'm using a very helpful example <a href="http://blog.sqisland.com/2014/12/recyclerview-grid-with-header.html" rel="noreferrer">here</a> to show a RecyclerView and a GridLayoutManager to show a grid with a header.</p>
  
  <p>It looks pretty good, but my graphic designer wants the header item to take up the full width of the RecyclerView. Right now there is padding.</p>
  
  <p>When I set up the GridLayoutManager I add in padding (which I still want for the other grid items): [it's using Xamarin C#]</p>
  
  <pre><code>var numColumns = myListView.MeasuredWidth / tileSizeMax;
  myGridView.SetPadding(tilePadding, tilePadding, tilePadding, tilePadding);
  layoutManager = new GridLayoutManager(Activity, numColumns);
  myListView.SetLayoutManager(layoutManager);
  </code></pre>
  
  <p>So, how can I set the padding to be different for the header item...or make it draw itself over the padding?</p>