Using Google Play expansion files in Native Activity App


Just wondered if anyone has managed to integrate the Google APK Extension files within a native activity app through nsight-tegra on visual studio?

I’ve got the reading of the APK Extension files working, but the issue that I have is that I need to implement the Google Play Licensing Library and the Google Play APK Expansion library into my project so I can download the .obb files if the user has deleted them or they have not downloaded with the applicaion. I also need to find a way to get the downloader code working from a minimal Native Activity java class.

Any suggestions would be welcome.