title: How to display Android UI Elements about 180 degrees rotated
body: <p>I would like to display some UI Elements on a android xml layout file. 
  I try to make an application, where two players can sit at each end of the mobile device, and play against each other.</p>
  
  <p>So need to show some Button 180 degrees rotateted.</p>
  
  <p>Is this possible? I tried android:gravity, but this did not work.</p>
  
  <p>Thanks for you help,
  Martin</p>