Cross-platform Mobile Applications with C# and .NET - Miracle Open World 2012

The session will show how you can use C# and .NET to build iOS and Android applications and take full advantage of the APIs provided by the two different platforms. From this, you will find out how to re-use your C# and .NET code across these mobile platforms, including Windows Phone 7 devices and just how much code you can re-use as well as find out how Xamarin are working to make this process as easy as possible.

Transcript

1. Cross-platform Mobile Applications with C# and .NET Miracle Open World 2012 19th April 2012 There will be QR Codes, be ready!
2. Chris Hardy • .NET Contractor • Work with Xamarin • Wrote some books • First spoke about MonoTouch in January 2010 • http://twitter.com/chrisntr
3. Agenda • What is Mono? • .NET on iOS with MonoTouch • .NET on Android with Mono for Android • Sharing .NET code
4. Where it all begins...
5. What is Mono? • Open source implementation of the .NET platform created by Ximian • 2001: Created to bring Windows applications to Linux • 2003: Acquired by Novell with Ximian • Matured at Novell in research mode; now a world-class runtime.
6. C# IronRuby IronPython Visual Basic F#
8. Xamarin • Xamarin founded in May 2011 • Xamarin has a perpetual license to all Mono IP: copyrights, patents and trademarks • Focused on mobile app development
9. C# IronRuby IronPython Visual Basic F#
10. MonoTouch Mono for Android
11. What is MonoTouch? • C# on iOS devices (iPhone, iPod Touch, iPad) What MonoTouch is not... • Silverlight for iOS devices • Compact Framework for iOS devices • iOS development without a Mac • A meta-platform
12. What is Mono for Android? • C# on Android devices What Mono for Android is not... • Silverlight for Android devices • Compact Framework for Android devices • Supported for Linux • A meta-platform
13. xamarin.com/apps
14. Demo Tweeting with MonoTouch
15. Demo of Mono for Android
16. MonoTouch / Mono for Android Features • MonoDevelop iPhone/Android Add-In • Visual Studio support for Android • monotouch.dll / monoandroid.dll • Full static AOT compiler / Allow JIT for Android • Support for all your existing code • Reflection • Generics • LINQ • Anonymous Methods • Lambda’s etc...
17. MonoTouch APIs .NET APIs Native APIs 3rd Party mscorlib System System.Core (LINQ) System.Data Mono.Data.Sqlite System.ServiceModel System.Json System.Web.Services (WCF) System.Xml System.Xml.Linq AddressBook/ AddressBookUI AudioToolbox/ AVFoundation CoreAnimation CoreGraphics CoreLocation EventKit/EventKitUI ExternalAccessory GameKit MapKit NewsstandKit StoreKit Twitter UIKit And so on.... OpenTK OpenGL OpenAL SQLite MonoGame RestSharp Json.NET ServiceStack Steema TeeChart Flurry Analytics RedLaser And so on...
18. Mono for Android APIs .NET APIs Native APIs 3rd Party mscorlib System System.Core (LINQ) System.Data Mono.Data.Sqlite System.ServiceModel System.Json System.Web.Services (WCF) System.Xml System.Xml.Linq Android.Accounts Android.App.* Android.Bluetooth Android.Content.* Android.Database Android.Graphics Android.Hardware Android.Locations Android.Net.* Android.Nfc Android.Text Android.Util Android.Views.* Android.Widget Java.Lang.* Java.Util.* And so on.... OpenTK OpenGL OpenAL SQLite MonoGame RestSharp Json.NET ServiceStack Steema TeeChart And so on...
19. Cross platform with MonoTouch, Mono for Android, WP7
20. Win/WP7 WPF Silverlight OSX MonoMac C# Plus ECMA languages .NET iOS MonoTouch Android Mono for Android Mono Business Logic and Middleware (engine, core and 3rd party) Native UI APIs Runtime OS Code sharing and native experience
21. MWC 2012 http://bit.ly/mwc2012xamarin
22. MWC 2012
23. MWC 2012 • 1,635 Lines of shared code - 771 for ORM
24. MWC 2012 • 1,635 Lines of shared code - 771 for ORM • iPhone + iPad (2,476 LOC / 2 Apps) - 57% Re-use
25. MWC 2012 • 1,635 Lines of shared code - 771 for ORM • iPhone + iPad (2,476 LOC / 2 Apps) - 57% Re-use • Android (1,095 LOC) - 60% Re-use
26. MWC 2012 • 1,635 Lines of shared code - 771 for ORM • iPhone + iPad (2,476 LOC / 2 Apps) - 57% Re-use • Android (1,095 LOC) - 60% Re-use • Windows Phone 7 (896 LOC) - 65% Re-use
27. Techniques for Cross Platform Code
28. Techniques for Cross Platform Code 1. Portable Library Tools
29. Techniques for Cross Platform Code 1. Portable Library Tools 2. Linking Files
30. Techniques for Cross Platform Code 1. Portable Library Tools 2. Linking Files 3. Project Linker
31. Techniques for Cross Platform Code 1. Portable Library Tools 2. Linking Files 3. Project Linker 4. Xamarin.Mobile
32. Portable Library Tools http://bit.ly/portablelibrarytools
33. Portable Library Tools
34. Portable Library Tools • Pros
35. Portable Library Tools • Pros • One class library to rule them all
36. Portable Library Tools • Pros • One class library to rule them all • Common subset across all platforms
37. Portable Library Tools • Pros • One class library to rule them all • Common subset across all platforms • Cons
38. Portable Library Tools • Pros • One class library to rule them all • Common subset across all platforms • Cons • No Pre-processor Directives
39. Portable Library Tools • Pros • One class library to rule them all • Common subset across all platforms • Cons • No Pre-processor Directives • No platform specific-code
40. Portable Library Tools • Pros • One class library to rule them all • Common subset across all platforms • Cons • No Pre-processor Directives • No platform specific-code • Limited API set - no System.Xml.Linq or System.Net.WebClient
41. Demo Telephone Converter
42. Linking Files
43. Demo Twitter App
44. Project Linker http://bit.ly/projectlinkervs
45. Project Linker
46. Project Linker • Pros
47. Project Linker • Pros • Auto-link files between projects
48. Project Linker • Pros • Auto-link files between projects • Cons
49. Project Linker • Pros • Auto-link files between projects • Cons • Does not work with MonoDevelop
50. Project Linker • Pros • Auto-link files between projects • Cons • Does not work with MonoDevelop • Must have all projects in the same solution
51. Xamarin.Mobile
52. http://xamarin.com/mobileapi
53. StringBuilder builder = new StringBuilder(); String lineSep = System.getProperty("line.separator"); ContentResolver content = getContentResolver(); Cursor ncursor = null; try { ncursor = content.query (ContactsContract.Data.CONTENT_URI, new String[] { ContactsContract.Data.MIMETYPE, ContactsContract.Contacts.LOOKUP_KEY, ContactsContract.Contacts.DISPLAY_NAME }, ContactsContract.Data.MIMETYPE + "=? AND " + ContactsContract.CommonDataKinds.StructuredName.FAMILY_NAME + "=?", new String[] { ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE, "Eric" }, null); while (ncursor.moveToNext()) { builder.append (ncursor.getString(ncursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)) + lineSep); String lookupKey = ncursor.getString (ncursor.getColumnIndex(ContactsContract.Contacts.LOOKUP_KEY)); Cursor dcursor = null; try { dcursor = content.query (ContactsContract.Data.CONTENT_URI, new String[] { ContactsContract.Data.MIMETYPE, ContactsContract.CommonDataKinds.Phone.NUMBER, ContactsContract.Data.DATA1 }, ContactsContract.Contacts.LOOKUP_KEY + "=?", new String[] { lookupKey }, null); while (dcursor.moveToNext()) { String type = dcursor.getString (ncursor.getColumnIndex(ContactsContract.Data.MIMETYPE)); if (type.equals (ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE)) builder.append ("Phone: " + dcursor.getString(dcursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)) + lineSep); else if (type.equals (ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE)) builder.append ("Email: " + dcursor.getString(dcursor.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA1)) + lineSep); } builder.append(lineSep); } finally { if (dcursor != null) dcursor.close(); } } } finally { if (ncursor != null) ncursor.close(); } t.setText(builder.toString());
54. var builder = new StringBuilder(); var abook = new AddressBook(this); foreach (Contact c in abook.Where (c => c.FirstName == "Eric" && c.Phones.Any())) { builder.AppendLine (c.DisplayName); foreach (Phone p in c.Phones) builder.AppendLine (String.Format ("{0}: {1}", p.Label, p.Number)); builder.AppendLine(); } Console.WriteLine (builder.ToString());
55. StringBuilder builder = new StringBuilder(); String lineSep = System.getProperty("line.separator"); ContentResolver content = getContentResolver(); Cursor ncursor = null; try { ncursor = content.query (ContactsContract.Data.CONTENT_URI, new String[] { ContactsContract.Data.MIMETYPE, ContactsContract.Contacts.LOOKUP_KEY, ContactsContract.Contacts.DISPLAY_NAME }, ContactsContract.Data.MIMETYPE + "=? AND " + ContactsContract.CommonDataKinds.StructuredName.FAMILY_NAME + "=?", new String[] { ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE, "Eric" }, null); while (ncursor.moveToNext()) { builder.append (ncursor.getString(ncursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)) + lineSep); String lookupKey = ncursor.getString (ncursor.getColumnIndex(ContactsContract.Contacts.LOOKUP_KEY)); Cursor dcursor = null; try { dcursor = content.query (ContactsContract.Data.CONTENT_URI, new String[] { ContactsContract.Data.MIMETYPE, ContactsContract.CommonDataKinds.Phone.NUMBER, ContactsContract.Data.DATA1 }, ContactsContract.Contacts.LOOKUP_KEY + "=?", new String[] { lookupKey }, null); while (dcursor.moveToNext()) { String type = dcursor.getString (ncursor.getColumnIndex(ContactsContract.Data.MIMETYPE)); if (type.equals (ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE)) builder.append ("Phone: " + dcursor.getString(dcursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)) + lineSep); else if (type.equals (ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE)) builder.append ("Email: " + dcursor.getString(dcursor.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA1)) + lineSep); } builder.append(lineSep); } finally { if (dcursor != null) dcursor.close(); } } } finally { if (ncursor != null) ncursor.close(); } t.setText(builder.toString()); Manually in Java
56. var builder = new StringBuilder(); var abook = new AddressBook(this); foreach (Contact c in abook.Where (c => c.FirstName == "Eric" && c.Phones.Any())) { builder.AppendLine (c.DisplayName); foreach (Phone p in c.Phones) builder.AppendLine (String.Format ("{0}: {1}", p.Label, p.Number)); builder.AppendLine(); } Console.WriteLine (builder.ToString()); Xamarin.Mobile for Android
57. var builder = new StringBuilder(); var abook = new AddressBook(); foreach (Contact c in abook.Where (c => c.FirstName == "Eric" && c.Phones.Any())) { builder.AppendLine (c.DisplayName); foreach (Phone p in c.Phones) builder.AppendLine (String.Format ("{0}: {1}", p.Label, p.Number)); builder.AppendLine(); } Console.WriteLine (builder.ToString()); Xamarin.Mobile for iOS
58. var builder = new StringBuilder(); var abook = new AddressBook(); foreach (Contact c in abook.Where (c => c.FirstName == "Eric" && c.Phones.Any())) { builder.AppendLine (c.DisplayName); foreach (Phone p in c.Phones) builder.AppendLine (String.Format ("{0}: {1}", p.Label, p.Number)); builder.AppendLine(); } Console.WriteLine (builder.ToString()); Xamarin.Mobile for Windows Phone 7.1
59. The Future Personal Ideas • MonoTouch support for Visual Studio / Able to open WP7 projects in MonoDevelop • File -> New Cross-Platform Application • One “MonoMobile” class library for iOS, Android and Windows Phone 7 • Analyser tool for existing libraries
60. More resources? • http://docs.xamarin.com • Forums / Mailing Lists • StackOverflow • contact@xamarin.com • twitter.com/xamarinhq
61. Creating amazing applications!
62. Q & A Thanks! 15% off of MonoTouch or Mono for Android E-mail support@xamarin.com