We went through a lot of material here. You learned how to customize your code and screens for any devices using several different types of platform qualifiers. Then, you learned the basics about both the iOS and Android resource systems. You also learned how to add new resources to both platforms. Finally, you got some simple advice to always check for support for anything you need before trying to use it.
In the final chapter, we will see how easy it is to test, debug, and deploy our application.