title: How to tell a compiler how to organise files?
body: <p>I'm making an App in Android and I need to have organized files in <code>.apk</code> file.
  I need to be able to tell which files they are responsible for.
  When I have a project I can tell which classes are responsible for what (.java files) but when I have <code>.apk</code> file there are only .dex files.
  For example, I want to be able to satisfy that:
  Classes2.dex is responsible for cryptography,
  Classes3.dex is responsible for network connection.</p>
  <p>How can I tell a compiler how to organize files? Or there is another possibility?</p>