i think you can't do this on 4.2.2
just wait some time and we will have stable kitkat (no bugs) with CAFKernel and then you can use these xperia kitkat apps or any mods for kitkat
note: you can use any kitkat rom to flash kitkat apps but with many bugs...waiting is best solution
Over the last few weeks, we’ve seen quite a fewflagship (and former flagship) devicesget to … more
19 Sep 2014
By Will Verduzco
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?