title: How to implement a changelog in android?
body: <p>for my app i want to implement a changelog, but dont know how (which concept).</p>
  
  <p>I want, that the changelog pops up once a time after new version of my app installed.
  Sounds easy, but i have no clue. :/</p>
  
  <p>Dialog to show my Changelog exists already, i just wanna know how to show it one after an update.</p>
  
  <p>Thanks for your hints.</p>
  
  <p>Prexx</p>