title: Android Applications Without Any User Interaction
body: <p>I want to code an Android Application which does not have any user interaction. Naturally nearly all of the examples, design principles in Android include an activity, so an user interface. </p>
  
  <p>Do you know any good resource to create a non-ui Android Application ? Any information piece is welcome; example codes, design principles, best practices etc.</p>
  
  <p>I mean what I'm looking is not just to start a service from broadcast receiver. Everything in android designed according to a user interface, messaging structure, how asynchronous tasks handle long processes in worker thread and change gui in the main thread etc. In my opinion, an app without an UI in Android is some kind of hack, but this is what I need. So I wonder how do you hack ?     </p>