Introduction to xamarin
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Introduction to the Xamarin platform and Xamarin.Forms as a tool for cross platform application development
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Introduction to xamarin
- 1. Cross platform mobile development with the power of Xamarin https://cmatskas.com @christosmatskas Christos Matskas
- 2. Xamarin is a better way to Build Test Monitor
- 3. Create native iOS, Android, Mac and Windows apps in Visual Studio and C#
- 5. Silo Approach Build Apps Multiple Times • Multiple Teams • Multiple Code Bases • Different toolsets
- 6. HTML - Write Once, Run Anywhere Approach • Lowest common denominator • Browser fragmentation • Developing & designing for 1 platform, happen to get other platforms
- 7. Xamarin’s Unique Approach • Native User Interface • Native Performance • Shared code across platforms • C# & .NET Framework • Full API Coverage
- 8. With Xamarin.Forms: more code-sharing, native controls Traditional Xamarin approach Shared UI Code Xamarin.Forms Unique Approach
- 9. Why C#?
- 10. C# is Awesome • LINQ Support • Work With XML Easily XDocument • Event Handling & Delegates
- 11. C# with XamarinObjective-C See the Difference – Classes and Methods
- 12. C# with Xamarin Objective-C Simplifying Native Methods with Async/Await
- 13. C# with XamarinJava C# & Async with Xamarin See the Difference– Android ItemClick
- 14. Write Everything in C# C# Runs on 2.5 Billion Devices
- 16. .NET + Windows APIs
- 17. .NET + iOS APIs | 100% Coverage
- 18. .NET Android APIs | 100% Coverage
- 19. Anything you can do in Objective-C, Swift, or Java can be done in C# with Xamarin using Visual Studio
- 20. Xamarin.iOS does full Ahead Of Time (AOT) compilation to produce an ARM binary for Apple’s App Store. Native Performance Xamarin.Android takes advantage of Just In Time (JIT) compilation on the Android device.
- 21. Always Up-to-Date Track record of offering same-day support: iOS 5, iOS 6, iOS 7, iOS 7.1, iOS 8 Full support for: • Google Glass • Android Wear • Amazon Fire TV • More!
- 22. Code Sharing: Accelerate Development • Up to 90% Code Reuse • Leverage existing libraries – NuGet Support Code-sharing stats from iCircuit, built with Xamarin and featured on the App Store. Source: http://praeclarum.org/post/42378027611/icircuit-code-reuse-part-cinq
- 23. • 1 Assembly • Multiple Platforms • Including: • Xamarin.Android • Xamarin.iOS Portable Class Libraries
- 24. NuGet
- 25. Shared Projects
- 26. Xamarin Studio PC or Mac Visual Studio Plugin VS 2010 and Higher Development Environment
- 27. Visual Studio Integration A single solution: • iOS • Android • Windows Phone • Windows Store Leverage the entire Microsoft ecosystem: • ReSharper • Team Foundation Server • Your favorite code coverage and profiling tools
- 28. Visual Studio Integration Debug to: • Emulators • Devices Integrated into toolbar • Status • Logs • List of devices Just Click Start Debugging!
- 29. Xamarin Studio • Optimized for cross-platform mobile development • Explore native APIs with code completion • World class Android and iOS designers • Powerful debugging on simulator or device
- 30. Android Designer • World’s best Android designer • Available in: • Xamarin Studio • Visual Studio • Create UI with drag & drop simplicity • Target multiple screen sizes, resolutions and Android versions • Layouts saved in standard Android XML files
- 31. Xamarin Designer for iOS • World’s first iOS Designer available in Xamarin Studio and Visual Studio • Follows familiar Visual Studio designer idioms • Supports all UIKit elements • Edit custom and 3rd party components • Live preview of changes to properties
- 32. Xamarin Component Store Build Apps Faster • Add high quality pre-built app components directly from Visual Studio and Xamarin Studio • Beautiful cross-platform UI controls, cloud services and enterprise backend integrations are just a few clicks away
- 33. Xamarin Android Player High Speed Android Emulator • Mac or PC • Runs side-by-side Windows Phone Emulator Free for Xamarin Subscribers: • Xamarin.com/Android-Player
- 34. 40+ Pages, Layouts, and Controls Build from code behind or XAML Two-way Data Binding Navigation Animation API Dependency Service Messaging Center Shared UI Code What’s Included
- 35. Content MasterDetail Navigation Tabbed Carousel Pages
- 36. Stack Absolute Relative Grid ContentView ScrollView Frame Layouts
- 37. ActivityIndicator BoxView Button DatePicker Editor Entry Image Label ListView Map OpenGLView Picker ProgressBar SearchBar Slider Stepper TableView TimePicker WebView EntryCell ImageCell SwitchCell TextCell ViewCell Controls
- 38. Use a single API to generate native, platform- specific user interfaces At runtime, each Xamarin.Forms page and its controls are mapped to platform-specific native user interface elements Xamarin.Forms Example
- 39. Embed Custom Views Anywhere Not only are Xamarin.Forms pages mixable with custom screens, you can embed custom views built directly against Xamarin.iOS and Xamarin.Android into Xamarin.Forms pages. Call Platform APIs via Shared Services Need platform-specific functionality within a Xamarin.Forms page, such as querying the accelerometer? We’ve included services that quickly and easily abstract platform-specific API calls to keep you writing as much shared code as possible. Easy migration to the Xamarin Platform When your native platform integration requirements outgrow Xamarin.Forms, your shared code is easily migrated to Xamarin.iOS and Xamarin.Android using the full Xamarin platform. Extensibility
- 40. Demo
- 42. • Create Automated User Interface tests all in C# • Upload to the Test Cloud or run against a Device or Simulator • Run directly from Visual Studio or Xamarin Studio • Exposed via a NuGet Package • Free to use a Simulator* Test Cloud + UITest
- 43. Real-time monitoring. Track crashes and exceptions to understand what is happening with live users.
- 44. Report • Automatically report any uncaught managed or native exception. • Report your own caught exceptions with simple cross-platform API
- 45. Track • Track any event that occurs in your application. • Even track performance of how long an operation takes.
Editor's Notes
- Albert Einstin said: “You have to learn the rules of the game. And then you have to play better than anyone else”. Xamarin gives the set of tools that allows you to play better than everyone else. Today we are going to discuss about how to get started with Xamarin in order to create cross platform applications. If there is one thing that you take from here today, it should be how easy it is to create mobile apps.
- Multiple Teams Multiple Code Bases Expensive & Slow Positive = Great apps delivered to user’s platform Negative = Development hampered by multiple code bases & fragmentation
- Unhappy Users Unhappy Developers Increase in Abandoned Apps Limited to what is implemented PhoneGap, Cordova, Telerik Platform Silver (swift)
- UI build natively per platform, leveraging C# C# + XAML C# + XML C# + XIB One shared app logic code base, iOS, Android, Mac, Windows Phone, Windows Store, Windows
- Xamarin recently introduced Xamarin.Forms a new library for cross platform user interface. We will touch up on this later, but this enables you to be highly productive, share code, but build out UI on each platform and access platform APIs. With Xamarin.Forms you now have a nice Shared UI Code layer, but still access to platform APIs You can start from native, pick a few screens, or start with forms, and replace with native later
- Let’s talk a bit about C# and why it is awesome.
- Statically typed so you avoid a pitfall of errors that afflict other languages. Use LINQ in your Xamarin projects to query, filter and select data from in-memory arrays, or from databases such as SQLite. Parsing XML is easy Great for working with JSON Setting up event handling is a breeze Intellisense, lambdas, etc. are all awesome.
- Here is an example of creating a class with a method to get names 1 Line with LINQ to execute this command Take advantage of C# features and set properties easily
- With Xamarin we even extend native methods with C# Features Here there is no need for a callback block, simply await on the animation to finish before continuing on
- Here we can see how easy it is just to do a += for an event and not have to implement a bunch of listeners every time. Easy to read, string.Format, using args, etc. In fact we can make this call Async/Await by just adding async to the delegate!
- If you have ever developed for a Windows Platform before these .NET namespaces might look familiar. However, if we go to a new platform such as Windows Phone or Store we have a new SDK to use and a new set of namespaces.
- You can think of iOS and Android development the same with Xamarin. You can see we have all of our .NET namespaces and libraries, but Xamarin give us 100% api coverage of each iOS API in it’s SDK that we access view C#.
- The same is true for Android as well.
- There is no compromise on performance. Xamarin apps look and feel native because they are native.
- Apple has a developer preview where Xamarin has alphas ready. Google does not offer this. Android versions are usually 4 to 8 weeks out for a stable release, but alphas and betas are usually earlier. Xamarin realizes how important having iOS ready because within 24 hours a large portion of iOS users upgrade Android on the other hand is much different. After 4 months on the market Android 4.4 only had 1% adoption
- iCircuit is made by Frank Krueger, a long time Mono & Xamarin developer. Sharing code lead to 70 to 90% code reuse across platforms speeding up development Real-time circuit simulator and editor used to design analog and digital circuits http://praeclarum.org/post/42378027611/icircuit-code-reuse-part-cinq
- Portable Class Libraries are awesome! You can write all of your C# code in one assembly and share across all platforms Before the Xamarin & Microsoft Partnership PCLs were limited ONLY to Windows Platforms Now add official support to create and use PCLs in Visual Studio and Xamarin Sudio
- Xamarin Studio PC -> Android Mac -> iOS, Android, Mac Visual Studio: iOS, Android Windows
- Additionally Supports Visual Studio 2010, 2012, & of course 2013 Additionally support desktop apps on Windows: WPF, ASP.NET, Silverlight, WinForms! The same Solution & Projects open in BOTH Xamarin Studio and Visual Studio!
- Connect to Mac build host for iOS development Show list of all iOS devices and Simulators to debug on Shows all Android devices and emulators X86, Arm, Genymotion.. Take advantage of all debugging power of VS
- Xamarin Studio is available for Android development on the PC. Xamarin Studio on Mac offers: Android, iOS and Mac development World Class IDE with great features: Code Analysis Upload to Test Flight Git & Subversion Integration Code Completion Code Navigation Easy transition from Visual Studio The same Solution & Projects open in BOTH Xamarin Studio and Visual Studio!
- State of the art features: View different Themes View different device sizes Multi-view editing!
- Add high quality pre-built app components directly from Visual Studio. Includes dozens of beautiful UI controls and web services – adding a theme or a 3rd party library is just a few clicks away Complements existing .NET NuGet ecosystem Differentiator: focus on UI controls and themes – we are making developers better designers across all platforms
- Xamarin Android Player runs on Mac or PC and is built natively on each platform with Xamarin.Mac and WPF. On PC you will have no issues running the Xamarin Android Player if Hyper-V is enabled as you can run it side-by-side with no issues.
- Xamarin.Forms is much more that just a framework and includes everything you need to get up and running to build out full native applications. If you are used to MVVM type of development you will feel right at home.
- First you have a set of pages for each screen of your application There are things like Content, and MasterDetail which gives you a nice flyout With a tabbed view you get the correct look on each platform iOS on bottom, Android on top, and on WP you have a Pivot control
- Inside of a page are layouts A lot of options from something simple like a stack panel to complex and powerful grids
- You have more than 40 controls, layouts, and pages to mix and match from. These are all of the controls you have out of the box, you can of course create your own. What is unique is you get the native control and have access to it. Consider an Entry Field On iOS it is mapped to UITextField Android it is EditText Windows Phoneit is a TextBox
- Here is an example of Xamarin.Forms in action using C# in the code behind to create a login screen. You can see how each is rendered with the native controls on iOS, Android, and Windows Phone.
- Xamarin.Forms is extremely extensible as well allowing you to customize controls or add your own. You can always get down and call platform specific APIs, so you aren’t limited in any way.
- Demo time if so desired
- Looking at just a few of the screen sizes of Samsung devices you couldn’t even fit all of them on the screen, so how do you handle this problem?
- Xamarin UITest is a framework that ties in directly to the Nunit testing framework to write the UI tests. You can even run them directly against a simulator for free to do regression tests on your applications.
- Several enterprise component vendors announced their support for Xamarin.Forms. Enabling developers to use beautiful charts, grids, and other controls from their shared C# code.