You choose 'GitHub Repository'
Then you will end up here:
Look at https://github.com/digidotcom
Here you find:
The thing I found out is that when you are trying to build in Android Studio that you have to modify certain version numbers.
But after that it works. Beware that this sample doesn't run on android kitkat due to lacking support for tls 1.2. I tried this on lollipop and there it worked !