Cross-Platform Mobile Development with C# (MonkeySpace 2012)

Transcript

1. Greg Shackles 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. nycmobiledev.net @NYCMobileDev

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

   E-Book: 50% Off

5. Market Share (US): August 2012 Google Apple RIM Microsoft Symbian

   52.6% Android 34.3% Apple 8.3% RIM 3.6% Microsoft Source: comScore

6. native platform Languages Objective-C Java C#

7. Write once, run anywhere

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

   too much on HTML5 instead of native." - Mark Zuckerberg

9. Embrace the differences != !=

10. c# Everywhere MonoTouch Mono for Android Native

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

    •Memory Management •Task Parallel Library •Dynamic •Skill Reuse

12. xamarin Tools •Access to full platform SDKs •100% Native •Linker

    •Debugging •frequent releases •active community •Improved API

13. 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);

14. 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 };

15. - - - - - - - - - -

    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - UI and Platform Code Shared Code

16. 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 *

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

    Methods •Conditional Compilation •portable class libraries

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

19. None

20. Case Study: iCircuit

21. http://praeclarum.org/post/31799384896/icircuit-code-reuse-the-fourth-edition 16% 84% Shared Platform 31% 69% 13% 87% iOS

    WP7 Mac 19% 81% Android Case Study: iCircuit

22. Case Study: TouchDraw

23. http://lipsky.me/2012/9/11/touchdraw-code-reuse-updated 39% 61% Shared Platform 24% 76% 28% 72% iOS

    Mac Android Case Study: TouchDraw

24. SignalR Client Libraries http://github.com/gshackles/SignalR C# To Go Mono.CSharp http://github.com/gshackles/CSharpToGo Case

    Study: Class Libraries

25. Questions?