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C# for Android and iOS
Xamarin
Inhalt
Sie sind erfahrener C#-Entwickler, die Welt von Android und iOS
reizt Sie aber trotzdem? In dieser Session zeigt Ih...
Xamarin
Introduction
Agenda
Develop
Xamarin Studio
Visual Studio
Debugging
Example
App dev basics
Native APIs
Azure compon...
Introduction
What‘s Xamarin and what problems does it solve?
What Problem Does Xamarin Address?
 Need to support a broad range of mobile devices
Different platforms – Android, iOS, W...
Potential Solutions
 Build native apps
Requires knowledge about C#, Java, and/or Objective-C
Requires knowledge about the...
What is Xamarin?
 Company founded by the initiators of the Mono project
 C# + Runtime + .NET BCL
C# Compiler
Implementat...
• Xamarin is only free for very small apps
• Pricing per year and per developer
• Prices on the right as per Sept. 24th 20...
Bridges
public class ContactListCursorAdapter extends BaseAdapter {
private Context mContext;
private List<ContactEntry> m...
Bridges
public class HiveAdapter : BaseAdapter<Hive>
{
private IReadOnlyList<Hive> items = new List<Hive>();
public HiveAd...
Bridges// JAVA =======================================================
someTextView.setOnClickListener(new View.OnClickLis...
Wrapper Lifetime
IDisposable
Note that all classes derived
from Java.Lang.Object
implement IDisposable
Linker
Removes unused APIs to
reduce size of app
See Xamarin docs for details
Shared runtime during
debugging
Reduces pack...
Development
IDEs, Debugging
Xamarin Studio
Works on Windows and Mac
Basics similar to Visual Studio
If you know VS, you will immediately
understand it...
Visual Studio
Works only on Windows
The full IDE experience you
are used to
Same C# editor
Same UI
Full deployment and
deb...
Components
Xamarin Components
Full list of components see
Xamarin Components
website
Emulator
Debug and test your app
Android Device Emulator
Not specific to Xamarin
All features, tools, and restrictions of
...
Demo
Hello World!
Sample app in Xamarin Studio and Visual Studio
Comparing the developer
environments
Debugging experience
Sample
Create Project
Create and configure project
Create Project
Setup project dependencies
Data Access Layer
Platform-independent code
Abstract base class
Could be in a separate class library
(PCL)
Use DBConnectio...
Data Access Layer
Platform-independent code
Implementation for mobile
device
SQLite
Note
Full support for MEF
Async APIs
C...
Data Access Layer
Platform-independent code
Implementation for
SQL Server
Windows Azure SQL Database
Add Data Access
Add existing items
Mobile DAL
implementation
Add UI
UI for each list item
Add Adapter
Data Source for ListView
Note
Use of async/await
Use of Intent
Main Activity
Entry point for your app
Note
Renamed Activity1 to
MainActivity
Change base class to
ListActivity
UI for Details
Add second Activity
UI for Details
Add second Activity
Note
Intent to launch external
program (browser)
UI for Details
Add second Activity
Note
Intent to launch external
program (browser)
Action Bar
Add menu for action bar
Azure Mobile Service
Backend for app in the cloud
Create Azure Mobile
Service
In the background your data is
stored in SQL...
Azure Mobile Service
Backend for app in the cloud
Add table Hive
In the background you are
creating a table in SQL
Server
...
Azure Mobile Service
Backend for app in the cloud
Get URL and application
key
Add Sync Code
Sync triggered by action
bar button
Check Result
Run the app and check
result of sync in
Windows Azure SQL
Database
Summary
Summary
 Great to bring existing C# knowledge to mobile platforms
Existing business logic C# code might be reused
Write o...
Saves the day.
BASTA 2013 – C# Workshop
F&A
Rainer Stropek
software architects gmbh
rainer@timecockpit.com
http://www.time...
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Developing Android and iOS Apps With C#, .NET, Xamarin, Mono, and Windows Azure

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The Xamarin and Mono platforms enable C# developers to use their existing knowledge and experience to write apps für Android and iOS. At BASTA 2013 conference I did a 75 minutes session about that topic. During the session I showed a sample that used SQLite on the phone and Windows Azure Mobile Service as its backend in the cloud. This is the slidedeck I used for the session

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Developing Android and iOS Apps With C#, .NET, Xamarin, Mono, and Windows Azure

  1. 1. C# for Android and iOS Xamarin
  2. 2. Inhalt Sie sind erfahrener C#-Entwickler, die Welt von Android und iOS reizt Sie aber trotzdem? In dieser Session zeigt Ihnen Rainer Stropek, wie Sie mit den Xamarin-Tools Ihr C#-Wissen auf diese mobilen Plattformen mitnehmen können. Rainer stellt Ihnen die Tools vor und demonstriert an einem durchgängigen Beispiel, wie plattformübergreifende C#-Codewiederverwendung funktionieren kann.
  3. 3. Xamarin Introduction Agenda Develop Xamarin Studio Visual Studio Debugging Example App dev basics Native APIs Azure component Code sharing Summary Key takeaways Bildquelle: http://www.xamarin.com Bildquelle: Screenshot Xamarin Studio Bildquelle: http://www.flickr.com/photos/caveman _92223/3347745000/
  4. 4. Introduction What‘s Xamarin and what problems does it solve?
  5. 5. What Problem Does Xamarin Address?  Need to support a broad range of mobile devices Different platforms – Android, iOS, Windows Phone Different devices – smartphones, tablets  Existing C# knowledge and experience Skilled C#/.NET developers and existing C#/.NET codebase  Lack of knowledge about native development Java, Objective-C  Can we cover mobile device market with our existing knowledge and tools?
  6. 6. Potential Solutions  Build native apps Requires knowledge about C#, Java, and/or Objective-C Requires knowledge about the target platform  Build mobile web sites Does it feel like a real native app? Lack of possibilities to fully use the underlying platform?  Use a cross-platform development tookit E.g. Phonegap  Xamarin: Existing tools & knowledge with bridge to native APIs
  7. 7. What is Xamarin?  Company founded by the initiators of the Mono project  C# + Runtime + .NET BCL C# Compiler Implementation of the Common Language Infrastructure for Linux-based systems .NET Base Class Library  Bridges to native API Callable Wrappers  Development environments Xamarin Studio Visual Studio integration Component store
  8. 8. • Xamarin is only free for very small apps • Pricing per year and per developer • Prices on the right as per Sept. 24th 2013 • For up-to-date prices see Xamarin Store Pricing
  9. 9. Bridges public class ContactListCursorAdapter extends BaseAdapter { private Context mContext; private List<ContactEntry> mItems = new ArrayList<ContactEntry>(); public ContactListCursorAdapter( Context context, ArrayList<ContactEntry> items) { mContext = context; mItems = items; } public int getCount() { return mItems .size(); } public Object getItem(int position) { return mItems .get(position); } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { … } } Java Example
  10. 10. Bridges public class HiveAdapter : BaseAdapter<Hive> { private IReadOnlyList<Hive> items = new List<Hive>(); public HiveAdapter(Context context) { … } public override int Count { get { return this.items.Count; } } public override Hive this[int position] { get { return this.items[position]; } } public override long GetItemId(int position) { return this.items[position].Id; } public override View GetView( int position, View convertView, ViewGroup parent) { … } } C# Example getCount becomes Count property getItem becomes indexer getItemId becomes GetItemId getView becomes GetView
  11. 11. Bridges// JAVA ======================================================= someTextView.setOnClickListener(new View.OnClickListener() { public void onClick() { //Do Stuff } }); // C# ========================================================= itemTextView.Click += (o, e) => { // Do Stuff }; Events Java Listener Interfaces become C# events
  12. 12. Wrapper Lifetime IDisposable Note that all classes derived from Java.Lang.Object implement IDisposable
  13. 13. Linker Removes unused APIs to reduce size of app See Xamarin docs for details Shared runtime during debugging Reduces package size Speedup app deployment and startup during debugging
  14. 14. Development IDEs, Debugging
  15. 15. Xamarin Studio Works on Windows and Mac Basics similar to Visual Studio If you know VS, you will immediately understand it By far not that powerful as VS Identical project/solution file format Open project/solution files in both IDEs as you need it
  16. 16. Visual Studio Works only on Windows The full IDE experience you are used to Same C# editor Same UI Full deployment and debugging support
  17. 17. Components Xamarin Components Full list of components see Xamarin Components website
  18. 18. Emulator Debug and test your app Android Device Emulator Not specific to Xamarin All features, tools, and restrictions of native Android development apply ARM or Intel-based images ARM images are very slow Recommendation: Intel image with HAXM
  19. 19. Demo Hello World! Sample app in Xamarin Studio and Visual Studio Comparing the developer environments Debugging experience
  20. 20. Sample
  21. 21. Create Project Create and configure project
  22. 22. Create Project Setup project dependencies
  23. 23. Data Access Layer Platform-independent code Abstract base class Could be in a separate class library (PCL) Use DBConnection to keep code reusable Other strategies Link source files Use partial classes Use interfaces to isolate platform- specific aspects in your code Conditional compile Use patterns like MVVM to reduce amount of platform-specific code
  24. 24. Data Access Layer Platform-independent code Implementation for mobile device SQLite Note Full support for MEF Async APIs C# 5 async/await
  25. 25. Data Access Layer Platform-independent code Implementation for SQL Server Windows Azure SQL Database
  26. 26. Add Data Access Add existing items Mobile DAL implementation
  27. 27. Add UI UI for each list item
  28. 28. Add Adapter Data Source for ListView Note Use of async/await Use of Intent
  29. 29. Main Activity Entry point for your app Note Renamed Activity1 to MainActivity Change base class to ListActivity
  30. 30. UI for Details Add second Activity
  31. 31. UI for Details Add second Activity Note Intent to launch external program (browser)
  32. 32. UI for Details Add second Activity Note Intent to launch external program (browser)
  33. 33. Action Bar Add menu for action bar
  34. 34. Azure Mobile Service Backend for app in the cloud Create Azure Mobile Service In the background your data is stored in SQL Server
  35. 35. Azure Mobile Service Backend for app in the cloud Add table Hive In the background you are creating a table in SQL Server Mobile Services does not need a schema  no need to create columns in the table
  36. 36. Azure Mobile Service Backend for app in the cloud Get URL and application key
  37. 37. Add Sync Code Sync triggered by action bar button
  38. 38. Check Result Run the app and check result of sync in Windows Azure SQL Database
  39. 39. Summary
  40. 40. Summary  Great to bring existing C# knowledge to mobile platforms Existing business logic C# code might be reused Write once run anywhere is true for most business logic code  You still have to learn and understand the platform Activities, Intents, Services, Adapters, Android SDK, etc.  No or little code sharing for UI markup/code Can be maximized using MVVM approach
  41. 41. Saves the day. BASTA 2013 – C# Workshop F&A Rainer Stropek software architects gmbh rainer@timecockpit.com http://www.timecockpit.com @rstropek Danke für euer Kommen Mail Web Twitter

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