Greg Shackles - June 12, 2012

1. Cross-platform mobile development with c# Greg Shackles - June 12, 2012

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 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# • Base Class Library • LINQ • Parallel LINQ • Memory Management • Task Parallel Library • Dynamic

10. xamarin Tools • Access to full platform SDKs • 100% Native • Linker • frequent releases • active community • Improved API xamarin.com

11. 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 C# var attrs = new CFStringAttributes {     Font = listLineCTFont,     ForegroundColor = UIColor.Black.CGColor }; var astr = new NSAttributedString ("Hello World", attrs);

12. <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 C# [Activity(Label="@string/AppName", MainLauncher=true)] FindViewById<Button>(Resource.Id.Button).Click += delegate { // handle click };

13. Environment: iOS Xcode Integration Mac OS X MonoDevelop

14. Environment: android MonoDevelop Mac OS X Visual Studio Windows

15. Environment: android UI Designer: MonoDevelop and Visual Studio

16. Environment: windows phone Windows Visual Studio

17. Some Apps icircuit rdio gmusic c# to go ...and many more! infinite flight mwc 2012

18. Benefits • Powerful and mature language • Skill reuse • Native apps • Code reuse across platforms even non-mobile platforms!

19. app Architecture

20. What code can be shared? • Most non-UI or platform code • Core application logic • Entities • LINQ (objects, XML) • Network access • File / Database Access * * with some limitations

21. sharing techniques • File Linking • Abstraction • Observer Pattern • Partial Classes and Methods • Conditional Compilation • portable class libraries * * currently in development

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

23. Demo Time

24. Questions?