The document discusses cross-platform development using .NET, Xamarin, and MvvmCross. It introduces Xamarin for building iOS, Android, and Mac applications using C#, portable class libraries for sharing code across platforms, and the MvvmCross framework for implementing the model-view-viewmodel pattern across platforms. The document provides an example application, demonstrates plugins for accessing device functionality, and discusses platform-specific implementation details.

1. Hot Tuna
CROSS PLATFORM DEVELOPMENT WITH .NET, XAMARIN
AND MVVMCROSS

2. Sean’s Guff
Formerly CIO at Catalyst Risk Management
Currently unemployed
Personal shareware site at
www.sourceitsoftware.com
Blog at
sourceitsoftware.blogspot.com
@seanrcross
sean@sourceitsoftware.com

3. To cover
•What are we trying to achieve
•Example
•Theory (boring!)
•Getting started with MvvmCross
•Plugins
•Platform specific stuff
•Summary
•Links

4. The holy grail

5. What is achievable

6. Example – Lions Official (sorry)

8. The pieces
•.net (duh)
•Xamarin (iOS, Android, Mac)
•Portable Class Libraries
•MvvmCross

9. Xamarin
•Commercial products for C# development for non-Windows platforms
•Xamarin.Android
•Xamarin.iOS
•Xamarin.Mac
•Need business edition for VS integration @ $999 US each

10. Xamarin Demo

11. Portable Class Libraries
•Create a single library that can be used by multiple .net frameworks
•Allows access only to functionality shared by all selected frameworks
•Does some nifty namespace mapping
•Makes cross platform development much easier
•Microsoft and 3rd party PCLs available (HttpClient, Imaging, JSON…)

12. .net x.x
Silverlight
Portable Class
Library
Shared
functionality

13. .net x.x
Silverlight
Portable Class
Library
Shared
functionality
Windows Store

14. .net x.x
Silverlight
Portable Class
Library
Shared
functionality
Windows Store
Xamarin.XXXX

15. PCL Demo
Easy-peasy, lemon squeezy
It’s hard to find a good image of a class library

16. Mvvm: Model – View Model - Model

17. Mvvm: Key interfaces
•INotifyPropertyChanged
• RaisePropertyChanged(() => PropertyName );
•ICommand
•INotifyCollectionChanged (or ObservableCollection)

18. Mvvm: Binding

19. XAML
<StackPanel>
<TextBox Text="{Binding Hello, Mode=TwoWay}" />
<TextBlock Text="{Binding Hello}" />
<Button Content="Click Me" Command="{Binding MyCommand}" />
<Button Content="Go Second"
Command="{Binding GoSecondCommand}"
/>
</StackPanel>
Code
public class FirstViewModel
: MvxViewModel
{
private string _hello = "Hello MvvmCross";
public string Hello
{
get { return _hello; }
set { _hello = value; RaisePropertyChanged(() => Hello); }
}
public System.Windows.Input.ICommand MyCommand
{
get
{
return new Cirrious.MvvmCross.ViewModels.MvxCommand(DoMyCommand);
}
}
private void DoMyCommand()
{
Hello = Hello + " World";
}
public System.Windows.Input.ICommand GoSecondCommand
{
get
{
return new Cirrious.MvvmCross.ViewModels.MvxCommand(DoGoSecond);
}
}
private void DoGoSecond()
{
ShowViewModel<SecondViewModel>();
}
}

20. MvvmCross
•Cross Platform MVVM Development Framework
•Free, open source
•Supports
•
•
•
•
•
•
WP7,8
WPF
WinRT
Xamarin.Android
Xamarin.iOS
Xamarin.Mac
•AKA Mvx

21. MvvmCross Architecture

22. Using MvvmCross
•Hard
-
download from github, compile, include references etc
•Easy
-
Nuget; look for MvvmCross Hot Tuna Starter Pack, and plugins
•Real Easy
-
NinjaCoder

23. Getting started - Nuget

24. Getting started - NinjaCoder

25. Plugins
•Convenient way to access platform functionality
•Use NinjaCoder or Nuget to add plugins
•Includes Accelerometer, Email, Files, Location, Messaging, Sqlite
•3rd party plugins available as well.
•Consume plugins using Dependency Injection or Service locator

26. Plugins Demo

27. Platform specific code
•Describe functionality using an interface in .Core
•Create platform specific implementation in .xxxx
•Register implementation on app startup
◦ Mvx.RegisterSingleton<ISettingsPersistance>(new SettingsPersistanceWPF());
◦ Mvx.RegisterType<IGetRemoteData, RemoteDataWpf>();
•Consume plugins using Dependancy Injection or Service locator
• persistance = Mvx.Resolve<ISettingsPersistance>();

28. Platform specific example
•Here is one that I prepared earlier

29. Summary
•PCLs let you use easily share code across multiple platforms
•Xamarin lets you use C# on Android, iOS and Mac
•MvvmCross wraps it all up to make it easy
• Shared PCL that holds most functionality
• Platform specific apps for views and dependant code
•Plugins let you easily add functionality in a cross platform friendly way
•Do your own platform dependant stuff using interfaces and IoC/Dependancy Injection

30. Links - MvvmCross
Stuart Lodge - MvvmCross Author
•Twitter
@slodge
•Blog
http://slodge.blogspot.co.uk/
•Videos
http://www.youtube.com/user/MrHollywoof?feature=watch
•List of tutorial videos
http://mvvmcross.wordpress.com/
•Repository
https://github.com/slodge/MvvmCross

31. Links - Xamarin
•Website -
http://www.xamarin.com/
•Samples -
https://github.com/xamarin
•Mobile library - https://github.com/xamarin/Xamarin.Mobile

32. Links – Ninja Coder
•Adrian Sudbury – Ninja Coder Author
•Twitter
@asudbury
•Blog
http://adriansudbury.blogspot.co.uk/
•Ninja Coder
http://visualstudiogallery.msdn.microsoft.com/618b51f0-6de8-4f85-95ce-a50c658c7767

33. Links - Other
http://www.hanselman.com/blog/CrossPlatformPortableClassLibrariesWithNETAreHappening.aspx
http://sourceitsoftware.blogspot.co.nz/

34. Credits
Mvvm Images from http://books.zkoss.org/wiki/ZK_Developer%27s_Reference/MVVM

35. Questions
•Answers not guaranteed