1. Xamarin
C# Rocks. Mobile Rocks.You
Rock.

2. bryan costanich
em: bryanc@xamarin.com
tw: @bryancostanich
slides: slideshare.net/bryancostanich

3. Sample Code
Agent Watch - blog.xamarin.com
Tasky - github.com/xamarin/mobilesamples/TaskyPro

4. DEMO
Agent Watch + Xamarin.Android

5. C# is Everywhere.

6. Xamarin Platform
(The Pitch)

7. Two Languages,
One Framework.
.NET Framework + BCL
Managed Runtime/Garbage Collection
LINQ
Lambdas
Async/Await + Task Parallel Lib.
Compile-Time Checks
C
F
#
#

8. Native
Performance
Native UX
Compiles Down to Native Code, Not
Interpreted
All Native UX Controls
Full Platform SDK Access
iOS: Selectors/Obj-C Runtime
Android: JNI
Fast Enough for Games

9. Massive Code
Reuse
Share C# Code Across Platforms
C# Libraries
Obj-C Bindings + Binding Projects
.jar Bindings + Binding Projects
C via pInvoke
C++ via CPPSharp
(github.com/mono/CppSharp)

10. Component Store
Create Sophisticated Applications
Quickly
High Quality Cross-Platform
Components
First Class, in-IDE Experience (VS +
XS)

11. Other Platforms
Windows - via .NET
Mac - via Xamarin.Mac
Linux - via Mono
Ouya, XBOX, PSP, etc.
Etc.

12. Xamarin + C#
Community is
Awesome
Huge C# Community
StackOverflow.com
forums.xamarin.com
IRC + chat.xamarin.com
Great Support

13. Amazing IDEs
Visual Studio or Xamarin Studio
Android + iOS Designer
Debugging, Autocomplete,
Refactoring
Integrated Source Control

14. Component Store
Tons of Components
Cross-Platform
IDE-Integration - drop-in!
Revenue Model for User Submitted

15. Xamarin is Awesome.

16. Building Xplat Mobile
Apps

17. General Xplat
Considerations

18. Design PlatformSpecific UX
UX in iOS != Android != Windows
Phone
UX Metaphors are Different:
Navigation Controller vs. Back Button
Write-Once, Run-Anywhere is
Problematic
Users Expect Native UX

19. Choose Device
Targets
iPhone != iPad
Beware Android Fragmentation
Form Factor + Capability Differences
Inform UX
Pro-Tip: Minimize Targets

20. Test on All
Targeted Devices!
Device != Emulator/Simulator
Xamarin Test Cloud
Hundreds of Actual Devices
Integrates into your CI Workflow

21. Xplat Architectural
Recommendations

22. Architecture
Good Architecture == Good
Architecture
Layers
Separation of Responsibility
Encapsulation
Enables Core Code Sharing

23. Code Sharing PCL vs. File
Linking
PCL Libraries - Great for Components
File Linking - Better for Apps
PLP - Take a Lot of Architectural Work, Linking
is Easy
Our Recommendation: File Linking for Projects
Both VS and XS have Project Linker Add-ins

24. Project Setup
New Blank Solution: "[AppName]"
New C# Lib Project: "[AppName].Core"
Test Project: “[AppName].Core.Tests”
New Xamarin.iOS: “[AppName].iOS”
New Xamarin.Android: “[AppName].Droid”
New Windows Project
"[AppName].WinStore"

25. Demo
Creating a Cross Platform Mobile Solution

26. Shared Data +
Data Access Layer
SQLite on iOS + Android, C# SQLIte on
Windows Market Apps:
http://code.google.com/p/csharp-sqlite/
SQLite.NET ORM
Use Generics for CRUD Convenience
Methods:
TaskDatabase.cs

27. Platform Divergence
Handling Divergence + Taking Advantage of Platform Features

28. Conditional
Compilation
Pre-Defined Symbols:
#if __MOBILE__
#if __ANDROID__
#if __IOS__
#if WINDOWS_PHONE
#if SILVERLIGHT
Can Add Additional in Build Settings

29. Architectural
Abstraction
Different Implementation using
Architecture
Interfaces
IoC/Provider Pattern

30. Xamarin.*
Libraries
XPlat API Abstractions
Open Source
Github.com/Xamarin/Xamarin.*
Mobile
Social
Auth

31. Other Xplat Libs
MonoCross http://code.google.com/p/monocross/
MvvmCross https://github.com/slodge/MvvmCross
Vernacular - https://github.com/rdio/vernacular
MonoGame - http://monogame.net
Cocos2D - http://cocos2DXNA.net
Many, many, many more!!!

32. Get Building. :)

33. Q+A