iTunes on Android...Will it ever happen

I'm not an iTunes owner but my sister asked me, how she can get an iTunes app for her Android phone. I told her there was not one. She asked me why? Then I paused.....and told her because deep down inside, Apple and Google don't like each other. She basically said that's the dumbest excuse she has ever heard.

Which got me thinking why on earth is there not an native iTunes App on Android? I mean even Microsoft as annoying as they can be sometimes is looking to put Office on both Android and think Apple will ever make an app for an Android device?