Cross-Platform Mobile Development with C#

The mobile space continues to heat up, but every platform has its own language and set of tools you must use if you want to deliver a fully native experience to your users. Did you know that you can actually use C# and the .NET Framework to build native applications for iOS, Android and Windows Phone? Using C# and .NET across the board also means that you have the opportunity to share large amounts of code between platforms.

This session will introduce you to:

Developing cross-platform mobile applications using C#
Making use of MonoTouch and Mono for Android for iOS and Android
And exploring how they relate to the native platform libraries

Transcript

1. Gr S Cross-platform mobile development with c#
2. About Me Greg Shackles Senior Software Engineer OLO Online Ordering email greg@gregshackles.com twitter @gshackles github github.com/gshackles blog gregshackles.com Slides speakerdeck.com/u/gshackles
3. the Book oreil.ly/Lp5smR Discount Code: AUTHD Print Book: 40% Off E-Book: 50% Off
4. Market Share (US): April 2012 Google Apple RIM Microsoft Symbian 50.8% Android 31.4% Apple 11.8% RIM 4.0% Microsoft Source: comScore
5. native platform Languages Objective-C Java C#
6. Write once, run anywhere
7. platform differences != !=
8. c# Everywhere MonoTouch Mono for Android Native
9. The Power of C#
10. The Power of C# •Base Class Library
11. The Power of C# •Base Class Library •LINQ
12. The Power of C# •Base Class Library •LINQ •Parallel LINQ
13. The Power of C# •Base Class Library •LINQ •Parallel LINQ •Memory Management
14. The Power of C# •Base Class Library •LINQ •Parallel LINQ •Memory Management •Task Parallel Library
15. The Power of C# •Base Class Library •LINQ •Parallel LINQ •Memory Management •Task Parallel Library •Dynamic
16. xamarin Tools xamarin.com
17. xamarin Tools xamarin.com •Access to full platform SDKs
18. xamarin Tools xamarin.com •Access to full platform SDKs •100% Native
19. xamarin Tools xamarin.com •Access to full platform SDKs •100% Native •Linker
20. xamarin Tools xamarin.com •Access to full platform SDKs •100% Native •Linker •frequent releases
21. xamarin Tools xamarin.com •Access to full platform SDKs •100% Native •Linker •frequent releases •active community
22. xamarin Tools xamarin.com •Access to full platform SDKs •100% Native •Linker •frequent releases •active community •Improved API
23. CFStringRef  keys[]  =  {        kCTFontAttributeName,        kCTForegroundColorAttributeName };   CFTypeRef  bval[]  =  {        cfListLineCTFontRef,        CGColorGetConstantColor(kCGColorBlack) };   attr  =  CFDictionaryCreate  (        kCFAllocatorDefault,        (const  void  **)  &keys,  (const  void  **)  &bval,        sizeof(keys)  /  sizeof(keys[0]),  &kCFTypeDictionaryKeyCallBacks,        &kCFTypeDictionaryValueCallBacks);   astr  =  CFAttributedStringCreate( kCFAllocatorDefault,  CFSTR("Hello  World"),  attr); obj-c
24. C# CFStringRef  keys[]  =  {        kCTFontAttributeName,        kCTForegroundColorAttributeName };   CFTypeRef  bval[]  =  {        cfListLineCTFontRef,        CGColorGetConstantColor(kCGColorBlack) };   attr  =  CFDictionaryCreate  (        kCFAllocatorDefault,        (const  void  **)  &keys,  (const  void  **)  &bval,        sizeof(keys)  /  sizeof(keys[0]),  &kCFTypeDictionaryKeyCallBacks,        &kCFTypeDictionaryValueCallBacks);   astr  =  CFAttributedStringCreate( kCFAllocatorDefault,  CFSTR("Hello  World"),  attr); obj-c var  attrs  =  new  CFStringAttributes  {        Font  =  listLineCTFont,        ForegroundColor  =  UIColor.Black.CGColor };   var  astr  =  new  NSAttributedString  ("Hello  World",  attrs);
25. <activity  android:name=".SampleActivity"            android:label="@string/app_name">   <intent-­‐filter>     <action  android:name="android.intent.action.MAIN"  />     <category  android:name="android.intent.category.LAUNCHER"  />   </intent-­‐filter> </activity> findViewById(R.id.button).setOnClickListener( new  View.OnClickListener()          {                @Override      public  void  onClick(View  v)      {              //  handle  click      }        } ); Java
26. C# <activity  android:name=".SampleActivity"            android:label="@string/app_name">   <intent-­‐filter>     <action  android:name="android.intent.action.MAIN"  />     <category  android:name="android.intent.category.LAUNCHER"  />   </intent-­‐filter> </activity> findViewById(R.id.button).setOnClickListener( new  View.OnClickListener()          {                @Override      public  void  onClick(View  v)      {              //  handle  click      }        } ); Java [Activity(Label="@string/AppName",  MainLauncher=true)] FindViewById<Button>(Resource.Id.Button).Click  +=  delegate   {   //  handle  click };
27. Environment: iOS Mac OS X MonoDevelop Xcode Integration
28. Environment: android Mac OS X Windows MonoDevelop Visual Studio
29. UI Designer: MonoDevelop and Visual Studio Environment: android
30. Environment: windows phone Windows Visual Studio
31. Some Apps ...and many more! icircuit rdio gmusic c# to go infinite flight mwc 2012
32. Benefits
33. •Powerful and mature language Benefits
34. •Powerful and mature language •Skill reuse Benefits
35. •Powerful and mature language •Skill reuse •Native apps Benefits
36. •Powerful and mature language •Skill reuse •Native apps •Code reuse across platforms Benefits even non-mobile platforms!
37. app Architecture UI# C## Run)me# Pla/orm# Silverlight# Business#Logic# .NET# WP7# iOS# Mono# Android# MonoTouch# Mono#for# Android#
38. What code can be shared?
39. What code can be shared? •Most non-UI or platform code
40. What code can be shared? •Most non-UI or platform code •Core application logic
41. What code can be shared? •Most non-UI or platform code •Core application logic •Entities
42. What code can be shared? •Most non-UI or platform code •Core application logic •Entities •LINQ (objects, XML)
43. What code can be shared? •Most non-UI or platform code •Core application logic •Entities •LINQ (objects, XML) •Network access
44. What code can be shared? * with some limitations •Most non-UI or platform code •Core application logic •Entities •LINQ (objects, XML) •Network access •File / Database Access *
45. sharing techniques
46. sharing techniques •File Linking
47. sharing techniques •File Linking •Abstraction
48. sharing techniques •File Linking •Abstraction •Observer Pattern
49. sharing techniques •File Linking •Abstraction •Observer Pattern •Partial Classes and Methods
50. sharing techniques •File Linking •Abstraction •Observer Pattern •Partial Classes and Methods •Conditional Compilation
51. sharing techniques * currently in development •File Linking •Abstraction •Observer Pattern •Partial Classes and Methods •Conditional Compilation •portable class libraries *
52. library: xamarin.mobile Supports iOS, Android and Windows Phone xamarin.com/mobileapi
53. Demo Time
54. Questions?