title: How to change a bitmap's opacity?
body: <p>I have a bitmap:</p>
  
  <pre><code>Bitmap bitmap = BitmapFactory.decodeFile("some/arbitrary/path/image.jpg");
  </code></pre>
  
  <p>But I'm not going to display the image to the user. I want the alpha to be 100 (out of 255). If this is not possible, can I set the opacity of the <code>Bitmap</code>? </p>