Uploaded byEd Snider
Cross Platform Mobile Dev with C# and Xamarin 3 (RADNUG 8/19/14)
This document discusses using Xamarin to build cross-platform mobile apps with C# that can run on iOS, Android, and Windows. It outlines some of the benefits of using Xamarin, such as writing code once that runs on multiple platforms and leveraging the MVVM pattern. It also describes how Xamarin allows developers to share UI code across platforms using Xamarin.Forms, which provides common controls and pages that are rendered natively. The document concludes by listing some Xamarin resources and providing a link to sample code.
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Cross Platform Mobile Dev with C# and Xamarin 3 (RADNUG 8/19/14)
- 1. CROSS PLATFORM MOBILEDEV WITH C# AND XAMARIN 3 Ed Snider Aug 19 2014 Rappahannock Area Developers .NET Users Group (RADNUG)
- 2. CONTENT Introduction TheProblem with Native Mobile App Dev The Benefits of Multi-Platform Mobile Dev with C# How? - MVVM - Share Code - Xamarin Share UI Code w/ Xamarin.Forms DEMO
- 3. INTRODUCTION Ed Snider- @edsnider | www.edsnider.net Developer at InfernoRed Technology Co-Organizer of NoVA Mobile C# Developers’ Group www.infernored.com @infernoredtech www.novamobiledev.org @novamobiledev
- 4. THE PROBLEM WITH TRADITIONAL NATIVE MOBILE APP DEV… Native mobile apps are great but here’s the problem: Several Platforms: Windows, iOS, Android Several Languages: C#, Objective-C, Java Maintenance nightmares Customers and end-users suffer
- 5. THE BENEFITS OFMULTI-PLATFORM NATIVE MOBILE APP DEV WITH C# Develop for all platforms with a single language – C# - using Xamarin Harness the power of the .NET framework Single solution with shared code Unified and consistent maintenance/testing Feature parity across platforms = happy end users
- 6.
- 7. LEVERAGE THE MVVM PATTERN View (UI) Data Binding Commands ViewModel Model Platform Specific Service Implementations Service Interfaces Connectivity Location Camera Etc…
- 8. SHARE CODE! WindowsiOS Android View / UI View / UI Platform Specifics Platform Specifics Portable Class Library (PCL) ViewModels Models Core App Library View / UI Platform Specifics Services, Business Logic, Service Access, Data Access, etc.
- 9. XAMARIN… Xamarin isbuilt on Mono Allows native app compilation on Android and iOS using C# 100% API Coverage – All iOS and Android APIs are exposed as C# class libraries Up-to-date with API releases from Apple and Google
- 10. WINDOWS APIS 100%Coverage
- 11. IOS APIS 100%Coverage
- 12. ANDROID APIS 100%Coverage
- 13. HOW XAMARIN WORKS C# + .NET Runtime Native UI Native Performance
- 14. XAMARIN DEVELOPMENT TOOLS Xamarin for Visual Studio Xamarin Studio for Windows and Mac
- 15. SHARE UI CODE,TOO!
- 16. XAMARIN.FORMS Set ofAPIs that abstract platform specific UI elements and behaviors Write UI code once and it is rendered natively across iOS, Android and Window Phone Use C# and/or XAML Ships as NuGet packages Views can now live in the PCL Mix and match with platform APIs Shared UI Code
- 17. XAMARIN.FORMS CONTROLS Pages(e.g., Master-detail, Tabs, Carousel) Layouts (e.g., Stack, Grid) Views (e.g., Button, Label) Cells (e.g., templates for table/list items)
- 18. XAMARIN.FORMS PAGES Xamarin.Forms.Page Represents UI screens Page = Activity on Android Page = View Controller on iOS Page = Page on Windows Phone Xamarin.Forms Pages Documentation
- 19. XAMARIN.FORMS LAYOUTS RepresentsUI containers Logically structures UI elements Xamarin.Forms Layouts Documentation
- 20. XAMARIN.FORMS VIEWS RepresentsUI controls Implemented natively and platform specific Entry = EditText on Android Entry = UITextField on iOS Entry = Textbox on Windows Phone Xamarin.Forms Views Documentation
- 21. SOME OTHER COOLTHINGS ABOUT XAMARIN… Component Store: http://components.xamarin.com/ .NET Mobility Scanner: http://scan.xamarin.com/ F#: http://developer.xamarin.com/guides/cross-platform/ fsharp/fsharp_support_overview/ Xamarin Test Cloud: http://xamarin.com/test-cloud
- 22. RESOURCES Xamarin.Forms Intro http://developer.xamarin.com/guides/cross-platform/xamarin-forms/ introduction-to-xamarin-forms/ Code from my demo https://github.com/edsnider/CoffeeFinder-XamarinFormsDemo Image credit: https://octodex.github.com/
Editor's Notes
- #11 If you are a windows developer you will be used to these name spaces. These are the core .NET base libraries that we know and love. If you mix in windows phone and windows store development you get new namespaces Windows. And Microsoft. With platform specific APIs
- #12 Xamarin gives you the best of both worlds with full support for the .NET Framework (your System. Libraries) Then they create C# bindings for every API in iOS and Android As you can see here there are a few, CoreGraphics, CoreMotion, etc, These are your platform specific bits to take advantage of everything in iOS
- #13 Then they do the same thing for Android so here you get the Android specifics Renderscript, NFC to do cool phone tapping of data transfer And text to speech apis to make your app shine
- #14 On iOS Xamarin Compiles the C# down to IL (intermediate language) Then Xamarin create LLVM bit code Then the LLVM bit code runs through the same LLVM Compiler and Optimizer that apple users for objective-c code Creating the final native arm binary. On Android they use an advanced compiler and linking to IL and then JIT to create native instructions at runtime for optimal performance which often can be faster than the dalvik runtime.