Before we take a dive into the architecture of Xamarin.Android, let's first discuss the question of why Xamarin.Android is our choice. Like any significant platform decision, one size does not fit all, and there are a number of things that should be considered. The following two lists identify some of the key benefits and drawbacks of using Xamarin.Android.
It leverages existing C# and .NET skills: Developers invest a great deal of time and energy in mastering the many features of the C# language and the effective use of the .NET framework. Yes, Java and all object-oriented languages have many similarities, but there is a real cost associated with going from being proficient in C# and .NET to making the same claim in Java. Individuals and groups that have made a significant investment in C# and .NET and need to develop Android apps would be well served to at least consider Xamarin.Android.
It can be reused in cross-platform development...