If you graduate from university and work in a real company you will see that APIs, especially if given to customers, are nearly impossible to kill. You can chan

If you graduate from university and work in a real company you will see that APIs, especially if given to customers, are nearly impossible to kill. You can change them a little, but you can't get rid of them, ever. I bet there is even still a significant Android 2.3 community in China as well (as I guess in most other second/third world countries). If you don't replace Android, you won't replace the Java. And even then Android will be hard thread to your new project.