title: MapView in SherlockActivity
body: <p>My <code>MainActivity</code> extends <code>SherlockActivity</code> to implement the Actionbar on devices with lower Android versions.
  I want to show a little <code>MapView</code> in the <code>MainActivity</code>, but apparently I need my <code>MainActivity</code> to extend <code>MapActivity</code>:</p>
  
  <blockquote>
    <p>E/AndroidRuntime(2955): Caused by:
    java.lang.IllegalArgumentException: MapViews can only be created
    inside instances of MapActivity.</p>
  </blockquote>
  
  <p>The <code>MapView</code> is inflated from an xml file.</p>
  
  <p>How would I do this?</p>