Cross-platform Mobile Development

AgendaCross-Platform Mobile Development Greg Shackles Senior Software Engineer OLO Online Ordering greg@gregshackles.com gregshackles.com @gshackles github.com/gshackles Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

IntroductionThis session will discuss how to use C# to developiOS, Android and Windows Phone applications.We’ll cover: •Why use C#? •Code sharing techniques and patterns •Useful libraries Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

Beneﬁts•C# and .NET are mature and powerful•Skill reuse on all platforms•Apps are still completely native•Code can be reused across platforms (even non-mobile platforms!) Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

Requirements•MonoTouch •Mac OS X •MonoDevelop•Mono for Android •Mac OS X or Windows •MonoDevelop or Visual Studio 2010•Windows Phone •Windows •Visual Studio 2010 Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

File Linking•All profiles are not created equal•Single copy of file•Compile-time verification•Project Linker extension for VS2010 http://msdn.microsoft.com/en-us/library/ff648745 Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

Abstraction•Separate common logic from UI•Interfaces, base classes, etc.public interface IContactManager{ IList<Person> GetContacts();}public class AndroidContactManager : IContactManager{ public IList<Person> GetContacts() { return null; }} Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

Observer Pattern•Decouple UI from business logic•Business layer can publish updates•UI layer subscribes to updatespublic EventHandler<EventArgs> MessageReceived;MessageReceived += (sender, args) =>{ Console.WriteLine("Message received");}; Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

Library: TinyMessenger•Event aggregator/messenger•Publish/subscribe•Single ﬁle•Supports iOS, Android, Windows Phone https://github.com/grumpydev/TinyMessenger Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

Partial Classes and Methodspublic partial class MyClass{ // partial methods are private, and must return void partial void Foo(); public void Bar() { Foo(); }}public partial class MyClass{ partial void Foo() { Console.WriteLine("Foo"); }} Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

Conditional Compilation#if __ANDROID__ Console.Write(“Only on Android”);#elif WINDOWS_PHONE Console.Write(“Only on Windows Phone”);#else Console.Write(“Everything else”);#endif Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

Conditional Compilation•MonoTouch •No default symbols•Mono for Android •Windows Phone •__ANDROID__ •WINDOWS_PHONE •__ANDROID_1__ •SILVERLIGHT •__ANDROID_2__ •... Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

File Access•Direct ﬁle access •System.IO •Works on iOS and Android •Not supported by Windows Phone •Paths are different on iOS and AndroidFile.WriteAllText( Environment.GetFolderPath(Environment.SpecialFolder.Personal), "Writing directly to a ﬁle"); Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

File Access•Isolated Storage •Works on iOS, Android, and Windows Phone •Higher level API •Don’t need to worry about ﬁle pathsusing (var store = IsolatedStorageFile.GetUserStoreForApplication())using (var writer = store.OpenFile("MyFile", FileMode.Create)){ // write to the ﬁle} Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

Library: sqlite-net•Layer over SQLite database•Strongly-typed queries•Single ﬁle•Supports iOS, Android, Windows Phone http://code.google.com/p/sqlite-net Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

Library: MonoCross•Cross-platform MVC framework•Shared models and controllers•Views speciﬁc to platforms•Supports iOS, Android, Windows Phone•Sits atop MonoTouch, Mono for Android http://code.google.com/p/monocross/ Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

More LinksMWC 2012 Apphttps://github.com/xamarin/mobile-samples/tree/master/MWCNYC Code Camp 6 Apphttps://github.com/gshackles/NycCodeCamp6Mobile Development in C#http://amzn.com/1449320236 Xamarin Copyright 2012 © Xamarin Inc. All rights reserved

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Cross-platform Mobile Development

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