If emulation feels too complex, you can get your DC and MK fix through official Google Play Store titles:
If you want the Mortal Kombat vs DC Universe experience—complete with the awkward "Rage" mechanic and the T-rated fatalities—download PPSSPP and find the Mortal Kombat: Unchained ROM with the DC character mod. Play it with a physical controller attached to your Android. mortal kombat vs dc universe android best