The concept is to have many jni / lib folder for each sample application, ImageTarget / VideoPlayback / CloudReco
But all of them is in ONE tabbed application, split into 3 activity (or fragments), for example.
This is for the purpose when you have to present some of the Vuforia's feature so you can swap it inside the app, don't have to close the app and open other sample app.
Cheers
thanaanon