If I'm not wrong, with B4X we're talking about examples, classes, etc... that works on all platforms (B4A, B4J, B4i).
B4XPages is a "new way" of programming the apps to make easier to share the code between the three platforms.
You can still use B4A just as you did, or you can adapt to B4XPages that make some things easier, specially the android life cycle.
You can even mix B4A Activities with B4XPages