Cross-Platform Mobile Development with C# (2012-09-17)

Transcript

1. Greg Shackles Cross-platform mobile development with c# Sunday, September 16,

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2. About Me Greg Shackles Senior Software Engineer OLO Online Ordering

   email [email protected] twitter @gshackles github github.com/gshackles blog gregshackles.com Slides speakerdeck.com/u/gshackles Sunday, September 16, 12

3. the Book oreil.ly/Lp5smR Discount Code: AUTHD Print Book: 40% Off

   E-Book: 50% Off Sunday, September 16, 12

4. Market Share (US): July 2012 Google Apple RIM Microsoft Symbian

   52.2% Android 33.4% Apple 9.5% RIM 3.6% Microsoft Source: comScore Sunday, September 16, 12

5. native platform Languages Objective-C Java C# Sunday, September 16, 12

6. Write once, run anywhere Sunday, September 16, 12

7. "The biggest mistake we made as a company was betting

   too much on HTML5 instead of native." - Mark Zuckerberg Sunday, September 16, 12

8. platform differences != != Sunday, September 16, 12

9. c# Everywhere MonoTouch Mono for Android Native Sunday, September 16,

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10. The Power of C# Sunday, September 16, 12

11. The Power of C# •Base Class Library Sunday, September 16,

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12. The Power of C# •Base Class Library •LINQ Sunday, September

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13. The Power of C# •Base Class Library •LINQ •Parallel LINQ

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14. The Power of C# •Base Class Library •LINQ •Parallel LINQ

    •Memory Management Sunday, September 16, 12

15. The Power of C# •Base Class Library •LINQ •Parallel LINQ

    •Memory Management •Task Parallel Library Sunday, September 16, 12

16. The Power of C# •Base Class Library •LINQ •Parallel LINQ

    •Memory Management •Task Parallel Library •Dynamic Sunday, September 16, 12

17. xamarin Tools xamarin.com Sunday, September 16, 12

18. xamarin Tools xamarin.com •Access to full platform SDKs Sunday, September

    16, 12

19. xamarin Tools xamarin.com •Access to full platform SDKs •100% Native

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20. xamarin Tools xamarin.com •Access to full platform SDKs •100% Native

    •Linker Sunday, September 16, 12

21. xamarin Tools xamarin.com •Access to full platform SDKs •100% Native

    •Linker •frequent releases Sunday, September 16, 12

22. xamarin Tools xamarin.com •Access to full platform SDKs •100% Native

    •Linker •frequent releases •active community Sunday, September 16, 12

23. xamarin Tools xamarin.com •Access to full platform SDKs •100% Native

    •Linker •frequent releases •active community •Improved API Sunday, September 16, 12

24. 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 Sunday, September 16, 12

25. 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  attr  =  new  CFStringAttributes  {        Font  =  listLineCTFont,        ForegroundColor  =  UIColor.Black.CGColor };   var  astr  =  new  NSAttributedString  ("Hello  World",  attrs); Sunday, September 16, 12

26. <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 Sunday, September 16, 12

27. 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 }; Sunday, September 16, 12

28. Environment: iOS Mac OS X MonoDevelop Xcode Integration Sunday, September

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29. Environment: android Mac OS X Windows MonoDevelop Visual Studio Sunday,

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30. UI Designer: MonoDevelop and Visual Studio Environment: android Sunday, September

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31. Environment: windows phone Windows Visual Studio Sunday, September 16, 12

32. Benefits Sunday, September 16, 12

33. •Powerful and mature language Benefits Sunday, September 16, 12

34. •Powerful and mature language •Skill reuse Benefits Sunday, September 16,

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35. •Powerful and mature language •Skill reuse •Native apps Benefits Sunday,

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36. •Powerful and mature language •Skill reuse •Native apps •Code reuse

    across platforms Benefits even non-mobile platforms! Sunday, September 16, 12

37. app Architecture UI# C## Run)me# Pla/orm# Silverlight# Business#Logic# .NET# WP7#

    iOS# Mono# Android# MonoTouch# Mono#for# Android# Sunday, September 16, 12

38. What code can be shared? Sunday, September 16, 12

39. What code can be shared? •Most non-UI or platform code

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40. What code can be shared? •Most non-UI or platform code

    •Core application logic Sunday, September 16, 12

41. What code can be shared? •Most non-UI or platform code

    •Core application logic •Entities Sunday, September 16, 12

42. What code can be shared? •Most non-UI or platform code

    •Core application logic •Entities •LINQ (objects, XML) Sunday, September 16, 12

43. What code can be shared? •Most non-UI or platform code

    •Core application logic •Entities •LINQ (objects, XML) •Network access Sunday, September 16, 12

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 * Sunday, September 16, 12

45. sharing techniques Sunday, September 16, 12

46. sharing techniques •File Linking Sunday, September 16, 12

47. sharing techniques •File Linking •Abstraction Sunday, September 16, 12

48. sharing techniques •File Linking •Abstraction •Observer Pattern Sunday, September 16,

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49. sharing techniques •File Linking •Abstraction •Observer Pattern •Partial Classes and

    Methods Sunday, September 16, 12

50. sharing techniques •File Linking •Abstraction •Observer Pattern •Partial Classes and

    Methods •Conditional Compilation Sunday, September 16, 12

51. sharing techniques * currently in development •File Linking •Abstraction •Observer

    Pattern •Partial Classes and Methods •Conditional Compilation •portable class libraries * Sunday, September 16, 12

52. library: xamarin.mobile Supports iOS, Android and Windows Phone xamarin.com/mobileapi Sunday,

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53. Case Study: iCircuit Sunday, September 16, 12

54. Case Study: iCircuit http://praeclarum.org/post/15789866032/icircuit-code-reuse-part-trois 19% 81% Shared Platform 31% 69%

    13% 87% iOS WP7 Mac Sunday, September 16, 12

55. Case Study: TouchDraw Sunday, September 16, 12

56. Case Study: TouchDraw http://lipsky.me/2012/9/11/touchdraw-code-reuse-updated 39% 61% Shared Platform 24% 76%

    28% 72% iOS Mac Android Sunday, September 16, 12

57. Demo Time Sunday, September 16, 12

58. Questions? Sunday, September 16, 12