Activision has not released a standalone port of the MW2 campaign or multiplayer as a dedicated Android APK. If you find a website claiming to have an "exclusive" MW2 Android installer or a highly compressed 500MB version of the full game, be extremely cautious. These are almost always:
If you want a native Android experience designed for mobile hardware: How to play MW2 (2009) online multiplayer on Retroid download call of duty modern warfare 2 for android exclusive
: Stream your Steam or Battle.net library directly to your phone. PS Remote Play Steam Link Activision has not released a standalone port of