Feature android touch updates

This lets you use the onScroll listener of android to detect scroll events in the horizontal or vertical direction.  Also passes down the velocity from the onFling event.  These functions are really useful for touch based camera movements. 
hey, I guess I'm confused and/or not familiar enough with the Android intricacies, but why do we get a new method with new parameters, when we just discard the new parameters in the next line? Is this just for overloading/child-class implementation?