The android platform lets you download code from anuwhere and sideliad it into your app (IIRX Unity can do this for you, for example). The thing I linked to doe

The android platform lets you download code from anuwhere and sideliad it into your app (IIRX Unity can do this for you, for example). The thing I linked to does require you to upload to Play because I can't recall if there's a name for the DIY version. Either way if the app itself is pulled any code downloaded is running within the app, so it goes away too.