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Introduction to Android Development Using .NET and Mono

Introduction to Android Development Using .NET and Mono. Greg Shackles Senior Software Engineer OLO Online Ordering greg@gregshackles.com. About Me. Greg Shackles greg@gregshackles.com gregshackles.com Twitter: @ gshackles github.com/ gshackles. What We’ll Cover. What is Android?

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Introduction to Android Development Using .NET and Mono

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  1. Introduction to Android Development Using .NET and Mono Greg Shackles Senior Software Engineer OLO Online Ordering greg@gregshackles.com

  2. About Me • Greg Shackles • greg@gregshackles.com • gregshackles.com • Twitter: @gshackles • github.com/gshackles

  3. What We’ll Cover • What is Android? • Android architecture • Mono / .NET for Android • Android components • Demos

  4. What is Android? • Full stack • Open source • SDK provides tools and Java API • Applications typically written in Java • Purchased by Google in 2005 • v1.0 released in October 2008 • developer.android.com

  5. Market Share (US) 36.4% 13%

  6. Architecture

  7. What is Mono? • Open source • Implementation of the .NET CLR • Cross platform • Supports most of .NET 4.0 • mono-project.com

  8. Wait, didn’t Mono get killed off?

  9. A Very Brief History of Mono October 1999 August 2003 June 2004 April 2011 May 2011

  10. What is .NET for Android? • Runs side by side with Dalvik • Wraps Java/Android API bindings • Commercial product • Visual Studio 2010 or MonoDevelop • www.xamarin.com • Available this summer

  11. .NET for Android Architecture • Android/Managed Callable Wrappers • JNI bridges to talk between Android and Mono

  12. .NET for Android API • .NET events replace listener interfaces • Action replaces Runnable • Enumerations • Properties • Attributes and tooling generate configuration • OpenTK • Uses standard Android resource files

  13. Why?

  14. Component Types

  15. Activities • Provides UI for one screen • Can start other activities • Hierarchy of views • Typically defined in XML

  16. Activity Lifecycle Activity Starts onRestart() onStart() onResume() onCreate() User navigates back to the activity Activity is running User navigates back to the activity User navigates back to the activity Another activity is loaded Process killed Other apps need memory onPause() This activity is no longer visible onStop() Activity is shut down onDestroy()

  17. Activity Lifecycle (Simplified) • Activity stack • Configuration changes cause activity restart • Activity has 3 basic states • Running • Paused • Stopped

  18. Broadcast Receivers • No UI • Can start an activity • Receive/react to announcements • Apps can broadcast custom messages • Example: low battery

  19. Services • No UI, runs in background • Stays running when application loses focus • Can be accessed by many applications • Example: Music player

  20. Content Providers • Enables applications to share data

  21. Intents • Messages used to activate components • Launch an activity • Start or bind to a service • Broadcast a message to receivers • Implicit intents • Intent filters • Components register their capabilities • Example: launcher

  22. Storage • Shared preferences • Internal storage • External storage (SD card) • Database (SQLite) • Remote

  23. Java vs C# Java C#

  24. Questions?

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