There is no functional, native port of the full Black Ops 2 campaign or Zombies running on Android via APK alone. Any website promising a 100% working "TranZit Mode" offline is likely lying.
maps (like Standoff and Raid) and characters, though it generally requires an internet connection. call of duty black ops 2 apk obb for android offline
Below are the necessary files to get the game running on your device. You will need the APK file (the application installer) and the OBB file (the game data). There is no functional, native port of the