This is a native android app for navigate in stackoverflow.
You can see answers, questions, best users by reputation, search by text and tags among other things. 
It's open source.

 - [Code in Github.][1] 
 - [The App in Google Play.][2]

  [1]: https://github.com/maxwellnewage/stackoverflow-viewer
  [2]: https://play.google.com/store/apps/details?id=com.maxwell.stackviewer