title: Set GridView columnWidth to wrap_content in xml
body: <p>I have a <code>GridView</code> containing <code>ImageView</code> all of the same size.
  Each <code>ImageView</code> has its width set to <code>wrap_content</code>, so that I can support multiple screen resolutions by picking the correct version of my <code>Drawable</code> resource.</p>
  
  <p>I can't find a way to automatically set the column size of my <code>GridView</code> to the <code>ImageView</code>'s width.</p>
  
  <p>This can probably be done programmatically using</p>
  
  <pre><code>mGridView.setColumnsWidth(mImageView.getWidth());
  </code></pre>
  
  <p>but I can't find a way to do it using only XML. Does such way exists?</p>