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

2. About Me Greg Shackles email twitter github blog Slides
Senior Software Engineer
OLO Online Ordering
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. obj-c 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 C#
var attrs = new CFStringAttributes {
    Font = listLineCTFont,
    ForegroundColor = UIColor.Black.CGColor };
var astr = new NSAttributedString ("Hello World", attrs);

12. Java C# <activity android:name=".SampleActivity“
<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#
MainLauncher=true)]
FindViewById<Button>(Resource.Id.Button).Click += delegate {
// handle click };

13. Environment: iOS
Xcode Integration
Mac OS X
MonoDevelop

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

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

16. Environment: windows phone
Visual Studio

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

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

19. app Architecture

20. * with some limitations
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. * currently in development
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?