title: Run an android service when the application is closed
body: <p>Can anyone tell me where to search for the following?<br>
  I'm trying to create an application that allows the user to schedule an SMS to be sent at a specific time.<br>
  I can do this when the application is open and running but I want my application to work even if it is not running, using a service for example.<br>
  Can anyone tell my where can I find any resource for doing that?</p>