The document discusses Xamarin, a platform for building native iOS and Android apps using C#. Key points include: - Xamarin allows building fully native mobile apps that share C# code using Xamarin.iOS and Xamarin.Android - Xamarin 2.0 introduces Xamarin Studio IDE, support for C# 5 features like async/await, and a component store - The document demos building an iOS and Android app with Xamarin and using async/await to simplify asynchronous code

1. Craig Dunn
Developer Evangelist
Xamarin
craig@xamarin.com
@conceptdev
v.Now
The future is now :)

2. Agenda
• About Xamarin
• Xamarin 2.0
• v.Now
C# 5 - async await
iOS UI Designer
iOS 7
Google Play Services for Android
Test Cloud

3. About Xamarin
• Apps are native, performance is native
• Entire platform SDK available to your code:
- iOS: StoreKit, EventKit, iCloud, etc
- Android: Play Services, Compatibility Library, etc
• Share C# across Xamarin, Windows & WinPhone apps
• Leverage platform-specific libraries:
iOS: Objective-C
Android: Java
user experience
performance
features

4. About Xamarin
• Mono
C# + .NET implementation for Linux
started in 2001/released 2004
• MonoTouch (for iOS) - 2009
• Mono for Android - 2011
• MonoDevelop IDE
• MonoMac open source project
iPhoneOS 3.0, pre-iPad
Android 2.3 Gingerbread
C# 1.0

5. About Xamarin
• Mono
C# + .NET implementation for Linux
started in 2001/released 2004
• MonoTouch (for iOS) - 2009
• Mono for Android - 2011
• MonoDevelop IDE
• MonoMac open source project
Mono 3.2
.NET 4.5
C# 5
iOS 7
Android 4.3 Jelly Bean

6. Xamarin 2.0
• Xamarin Studio
• Xamarin.iOS
Visual Studio
• Xamarin.Android
• Component Store
• Free Starter Edition
http://xamarin.com/guide/
http://blog.xamarin.com/announcing-xamarin-2.0/

7. How Does it Work?
Windows
C#
Xaml
C#
Network,
Storage,
Business
Logic
UI
wire
-­‐up
logic
run/me
pla2orm
.NET
UI
your
code

8. How Does it Work?
Mono
.NET
RunBme
Windows
PhoneAndroid iOS WindowsMac
Shared
Code
(C#)
.NET
XamlAndroid
Xml Storyboards XIB
Xamarin.Android Xamarin.iOS Xamarin.Mac
C# C# C# C#
Xaml
C#
H7pClient
&
WebServices
SQLite.NET
&
database
IO
more...
UI
wire
-­‐up
logic
run/me
pla2orm
UIUIUIUIUI
your
code

9. Mac OS X WindowsWindows
IDE
iOS
Android
Mac
Windows/Phone
Xamarin Development Environments
Xamarin
Business
Edition+
Mac
+

10. Mac OS XWindows
Visual Studio Xamarin Build Host
Xamarin.iOS for
Visual Studio plug-in
Build Host configuration
iOS Projects
iOS Property Pages
iOS build, deploy, debug
iOS Output panes
Device iOS Simulator
Apple iOS SDK
Xcode
Interface Builder
Compiler
Keychain Certifications
Provisioning Profiles
Network
access
iOS apps
in Visual
Studio?!

11. Xamarin Development Environments
• Coding
Auto-complete
Refactoring
• User Interface Design
GUI tools
• Debugging
• Build & Deploy
Simulators & Devices
Testing & Production/App Stores

12. IOS
C# on iPhone, iPad and iPod touch

13. iOS Development Environment
Xamarin Studio
Visual Studio

14. iOS UI Designer
Xcode - now
Xamarin Designer - beta

15. iOS Development Environment
• Code signing
• App configuration
• Deployment
Keychain - certificates

16. iOS Development Environment
• Code signing
• App configuration
• Deployment
Provisioning Portal
http://developer.apple.com

17. iOS Development Environment
• Code signing
• App configuration
• Deployment

18. DEMO
iOS

19. ANDROID
C# on Android (Google Play, Kindle, ...)

20. Android Development Environment
Xamarin Studio
Visual Studio

21. Android UI Designer
Xamarin Studio
Visual Studio

22. Android Development Environment
Shared runtime for
debugging only.
Linking reduces size
Choose CPU arch

23. Android Development Environment
• AndroidManifest.xml
Permissions
App configuration
use [Activity] and
other attributes

24. Android Development Environment
• Deployment
Signing wizard

25. DEMO
Android

26. CROSS PLATFORM
Portable code...

27. What is a Portable Class Library?
Subset of .NET that
is supported across
the set of target
platforms.
Starting with
File > New App
gives you platform-
specific code, eg.
Windows Store

28. What is a Portable Class Library?
Subset of .NET that
is supported across
the set of target
platforms.
Some Microso!
platforms (eg.
Windows Phone) are
more restricted than
Xamarin.

29. What is a Portable Class Library?
Subset of .NET that
is supported across
the set of target
platforms.
Some Microso!
platforms (eg.
Windows Phone) are
more restricted than
Xamarin.
but no dynamic (AOT)

30. What is a Portable Class Library?
Profile1
NetForWSA, Net4,
SL4, WP7, XBox360

31. What is a Portable Class Library?
Profile2
NetForWSA, Net4,
SL4, WP7

32. What is a Portable Class Library?
Profile104
NetForWSA, Net45,
SL4, WP75

33. PCL Example
Tasky Portable XML
An abstract implementation
of a data storage class, with
implementation for each
platform
Profile 158

34. PCL Example
The Portable Class Library is compiled in a
way that is sharable.
We create a Provider for each platform

35. DEMO
Tasky Portable

36. ASYNC AWAIT
C# 5 tailor-made for mobile!

37. Mobile Apps
• Need responsive user interfaces
• App features are o!en dependent on:
network access
database functionality or I/O
complex processing on mobile CPUs
stuff that takes some time
• You want to run these on a different thread to keep the UI
responsive... they should be ASYNCHRONOUS!
Fast!
Long running tasks!
Threads!
All

38. DEMO
Async Await

39. Old-style
callbacks
1) Download Html string
2) Download Jpeg image
3) Save to Photo Album
5) Error Handling
4) Return Html length
6) InvokeOnMainThread
Callback Hell

40. Callback Hell
Old-style
callbacks
1) Download Html string
2) Download Jpeg image
3) Save to Photo Album
5) Error Handling
4) Return Html length
6) InvokeOnMainThread

41. Old-style callbacks
• Spaghetti code:
Callbacks are the new “GOTO”
Control flow jumps around in ways that are difficult to read
& understand from the source
Error handling is difficult to implement, required in many
different places
Changes in the chain can have unintended consequences
http://tirania.org/blog/archive/2013/Aug-15.html

42. 1) Download Html string
2) Download Jpeg image
3) Save to Photo Album
5) Error Handling
4) Return Html length
Comparison
Async-ified
6) InvokeOnMainThread

43. 1) Download Html string
2) Download Jpeg image
3) Save to Photo Album
5) Error Handling
4) Return Html length
Comparison
6) InvokeOnMainThread
one place
not required
Async-ified

44. Comparison
1) Download Html string
2) Download Jpeg image
3) Save to Photo Album
5) Error Handling
4) Return Html length
6) InvokeOnMainThread
old new!

45. DEMO
Tasky Parse

46. TEST CLOUD
Scalable, repeatable real device testing

47. Test Cloud

48. Test Cloud

49. Test Cloud

50. Test Cloud

51. RECAP

52. Recap
• Build iOS & Android apps in C# with .NET
Latest language features
• Use Xamarin Studio or Visual Studio
• Apps are native, with native performance
• Share C# code
• Latest C# 5 features
• Component Store
http://components.xamarin.com
• Test Cloud
http://testcloud.xamarin.com

53. Questions?
Developer Evangelist
Xamarin
craig@xamarin.com
@conceptdev
Craig Dunn
• Documentation
http://docs.xamarin.com/
• Samples
http://github.com/xamarin
http://xamarin.com/download