Maybe I'm just having a hard time wrapping my head around it. I kind of understand how it works from the research I've done, especially this question: How does Codename One work?
But what if I want to intercept incoming texts in Android? How does that affect the iOS app? If I want to use Vimeo's API to upload videos (I have an Android app that does it), will I have to get the source code and add that separately?