title: Dynamic android status bar notification
body: <p>I`ve an app that use sqlite for storage. In this database I have a table with multiple records that has datetime field. I want to always push a status bar notification 12 hours before of each.</p>
  
  <p>I took a look at <a href="http://developer.android.com/guide/topics/ui/notifiers/notifications.html" rel="nofollow">http://developer.android.com/guide/topics/ui/notifiers/notifications.html</a> and understand how to use it, but don`t know how to run it periodically in background.</p>
  
  <p>Any tips?</p>