Sample of handling taps on trackables which uses only java code.

Hi,

I've found Dominoes sample where user can tap over target and rendered objects to interact with them. I need to handle single-tap interactivity (user can touch rendered objects) but I don't want to use C code like in Dominoes sample. Can I handle tap using only java code? Is there any sample demonstrating this feature (Books sample doesn't handle tap on rendered object but in some area in the middle of the screen - so if object is not there touching on empty space still leads to the tap recognition which is wrong)?