Ok....the solution to this is uninstall both and reinstall the contruct2 again...and work fine.
I am not confidence with XDK atm...by the way, is that normal the size of APK eat up so much?
contruct 2 --> export android (600k) --> XDK (7mb) ....need 7mb that much? that's 1000x
Maybe in the future enbling the preview over wifi would help, since it is not using localhost for c2 in that case, you could also goes into c2's options and change the port maybe.
Also I think 7mb is 7000 kb, so more like 10x compared to 600 kb, but every wrapper I think adds a constant size