title: How to add multiple layer on an image in android
body: <p>I whould like to have an image (of a map) in the application and to programmatically add
  some layers on top of it (placeholders, paths, etc...)
  I think that a photoshop-like layer approach could be helpful, but I have no idea of where to start.
  Any simple example/link to tutorial or to documentation is useful :)</p>
  
  <p>Thanks</p>