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

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

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

The holy grail

What is achievable

Example – Lions Official (sorry)

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

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

Xamarin Demo

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 3 rd party PCLs available (HttpClient, Imaging, JSON…)

.net x.x Portable Class Library Shared functionality Silverlight

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

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

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

Mvvm: Model – View Model - Model

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

Mvvm: Binding

XAML Code <Button Content="Go Second" Command="{Binding GoSecondCommand}" /> 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 (); }

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

MvvmCross Architecture

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

Getting started - Nuget

Getting started - NinjaCoder

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

Plugins Demo

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

Platform specific example Here is one that I prepared earlier

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

Links - MvvmCross Stuart Lodge - MvvmCross Author Blog Videos List of tutorial videos Repository

Links - Xamarin Website - Samples - Mobile library -

Links – Ninja Coder Adrian Sudbury – Ninja Coder Author Blog Ninja Coder

Links - Other

Credits Mvvm Images from

Questions Answers not guaranteed