title: Android: creating a Bitmap with SurfaceView content
body: <p>I'm afraid to already have the unfortunate answer to this question but just in case... I'm using a SurfaceView to do some image processing with bitmaps (lights and colors modifications) and I would need to import the modified bitmap (i.e. the content of the SurfaceView) in a new bitmap so that I can save it as an image file. </p>
  
  <p>I've been looking around and it seems that it's possible to get a bitmap from View.getDrawingCache() but it doesn't work with SurfaceView. All I get is an empty bitmap.</p>
  
  <p>Is there any solution to this?</p>
  
  <p>Thanks</p>