How to implement a changelog in android?

for my app i want to implement a changelog, but dont know how (which concept).

I want, that the changelog pops up once a time after new version of my app installed. Sounds easy, but i have no clue. :/

Dialog to show my Changelog exists already, i just wanna know how to show it one after an update.

Thanks for your hints.

Prexx

Solution

one option is to use Android Change Log.

With Android Change Log you can easily create, show and maintain an Android change log dialog.

Features

display only what's new or show the whole change log
display on first start of newly installed app or on new app version
write the change log in a simplified language but also use HTML and CSS if needed