title: How to make an alert dialog fill 90% of screen size?
body: <p>I can create and display a custom alert dialog just fine but even so I have <code>android:layout_width/height="fill_parent"</code> in the dialog xml it is only as big as the contents.</p>
  
  <p>What I want is dialog that fills the entire screen except maybe a padding of 20 pixel.
  Then the image that is part of the dialog would automatically stretch to the full dialog size with fill_parent.</p>