My only experience with porting is working with Unity and going back and forth from PC to my Android phones. My problem is I don't know how porting is done exactly.
Let's say I want to port a Java program to Android. Do I have to create a layer of coding around the original Java source code and make it work with Android? Or is it just modifying the original source code to fit the new platform?
I searched multiple forums and countless google searches. I'm going insane. Please help me!