title: Relationship between layout() and onLayout()
body: <p>I've a custom linearlayout which calls <code>layout()</code> on each child in its <code>onLayout()</code> function. My custom child (extended from <code>MapView</code>) receives in its <code>onLayout()</code> function completely different numbers than I passed in the layout function.</p>
  
  <p>What's the relation between both?</p>