Chapter 4. XamSnap - A Cross-Platform App

The best way to truly learn a programming skill, in my opinion, is to take on a simple project that requires you to exercise that skill. This gives new developers a project where they can focus on the concepts they are trying to learn without the overhead of fixing bugs or following customer requirements. To increase our understanding of Xamarin and cross-platform development, let's develop a simple app called XamSnap for iOS and Android.

In this chapter, we will cover the following topics:

• Our sample application concept
• The Model layer of our application
• Mocking a web service
• The ViewModel layer of our application
• Writing unit tests