title: Android Circular Gradient Alpha Mask
body: <p>Is there a way to draw a circular gradient mask on a bitmap in Android?  Trying to produce something similar to a foggy window.  Click the window and a transparent circle shows up revealing whats behind the window. Prefferably using a gradient so the center of the circle is completely transparent and the further out from the center the less transparent. Is this possible?</p>
  
  <p>I'm new to Android so any code samples would be appreciated.</p>
  
  <p>Thanks. </p>