C# + Xamarin + VS.Net = cross-platform mobile app

awesomeness

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Mobile app approaches

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Silo

Source: http://channel9.msdn.com/Events/Build/2014/3-653

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Write-once, run anywhere

Source: http://channel9.msdn.com/Events/Build/2014/3-653

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Xamarin approach

Source: http://channel9.msdn.com/Events/Build/2014/3-653

Everything is awesome!

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Platform specific APIs are exposed via .Net

iOS APIs – 100% coverage► Generates native ARM code indistinguishable from Xcode

Android APIs – 100% coverage ► JIT in Mono execution environment

APIs are C#-ified► Static typing► C# language features

How native is “native”

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VS.Net – not actually required if just targeting Android/iOS

XamarinXamarin Studio IDE

VS.Net pluginsXamarin.iOS

Xamarin.Android

Xamarin build host on mac

Android SDKAndroid developer tools

Android debug bridge

Android virtual devices (emulators)

Mac OSXXcode

iOS Simulator

Stores► Google Play► iOS App Store► Windows/WinPhone App Store

Pieces to the puzzle

Demo8

Architecting for code reuse

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Portable Class Libraries

PCL.csproj

Class1.cs

iOS.csproj

Android.csproj

WinPhone.csproj

iOS Views, etc

Droid Views, etc

WP Views, etc

Dll Reference

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Linked Files

Class1.cs

iOS.csproj

Android.csproj

WinPhone.csproj

Class1.cs

Class1.cs

Class1.cs

iOS Views, etc

Droid Views, etc

WP Views, etc

Class1.cs compiled in app project

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Shared.csproj

Shared Project

Class1.cs

iOS.csproj

Android.csproj

WinPhone.csproj

Class1.cs

Class1.cs

Class1.cs

iOS Views, etc

Droid Views, etc

WP Views, etc

Class1.cs compiled in app project

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View Models

Model View ViewModel

Business Logic, Repositories, Models, etc

.Net, 3rd Party Frameworks

Xamarin.iOS

iOS Views

Xamarin.Android

Android Views

WinPRT

WinPhone Views

Unit tests

Bindings,Abstractions

Demo14

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Xamarin.Forms

Shared C# Backend (Xamarin + .Net)

iOS Native View

Android Native View

WinPhone Native View

Shared C# Views (Xamarin.Forms)

Dynamically generates

Demo16

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Xamarin Licensing► Starter (Free)► Indie ($299/year)► Business ($999/year)► Enterprise ($1899/year)

Get a Mac for iOS

Learn each platform► Before using abstractions► Know ins/outs, limitations► Easier to understand later

Xamarin community forums

Xamarin presentations forum► http://

forums.xamarin.com/categories/presentations

Sample apps► https://github.com/xamarin

Evolve 2014!► Oct 6th-10th, Atlanta

Xamarin University► Live online classes► Expert office hours

Where to start?

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Questions