title: Android Bitmap contour
body: <p>I'm trying to draw the contour of my drawable,<br>
  I tried to use Blur, as in this page:<br>
  <a href="https://stackoverflow.com/questions/4334341/how-to-make-glow-effect-around-a-bitmap">How to make glow effect around a bitmap?</a><br>
  Its effect is not what I want,<br>
  I want a "solid" contour, <br>
  not blurred.<br>
  <br>
  anyone knows how?<br></p>