SChartDelegate in the iOS version provides a multitude of callback method signatures, but I guess you're asking about the set of toggledSelectionFor... methods?
At present, the Android version doesn't support selection. We've released the initial version with a minimal API sufficient to cover the simple use cases, and plan to add features to bring it up to the level of the iOS version incrementally, over a number of fairly frequent releases - the Early Bird pricing reflects this. We've had a few people asking for selection, so it's fairly well up our feature backlog, but isn't done yet.
It's worth pointing out that the delegate object is very much an iOS/Objective C idiom, and that we'll probably do the Android API in a rather more Java-familiar style, and break SChartDelegate down into several smaller more focused interfaces.