Xamarin.Essentials brings over 60 native features to a single cross-platform library for .NET developers! A lot goes into building a library that supports iOS, Android, UWP, tvOS, watchOS, and Tizen! During this session James will walk through how the team plans, builds, tests, and deploys Xamarin.Essentials. This includes with multi-targeting, Azure DevOps, App Center builds, and so much more!

1. Meetup
Dutch Mobile .NET Developers
Welcome!
18:00 Doors open & Dinner
19:00 - 21:00 James Montemagno
How we build Xamarin.Essentials
21:00 Closing & drinks

2. James Montemagno
& Dutch Mobile .NET Developers Meetup
2014
Xamarin comes to
The Netherlands!
2016
Xamarin.Forms
Geek-Out
2019
How we build
Xamarin.Essentials

4. Agenda
• What’s New & Awesome for Xamarin Developers
• FAQ
• How we build Xamarin.Essentials
• FAQ

5. Xamarin:
What’s New & Awesome
@JamesMontemagno | jamont@microsoft.com

6. .NET: Your platform for building anything
Desktop Web Cloud Mobile Gaming IoT AI
.NET

8. Developer Productivity
Cross-Platform Everything
100% Native & Optimized

10. SmartHotel360 Reference App
Step
VS 2017
(15.8)
VS 2019
(16.0)
Delta
First Build 01:04.20 00:50.13 -21.95%
Incremental Build
(XAML Change)
00:10.62 00:07.47 -29.66%
Deploy (XAML
Change)
00:09.03 00:04.44 -50.83%

11. Startup Tracing

12. Startup TracingStartup Tracing

13. xxhdpi
Base
xxxhdpi
xhdpihdpi
enfr
esx86
arm64armv7a

14. Specific Languages
Proper Resource Screen
Densities
Best Match ABIs
arm64
en xxxhdpi
fr
Base
Optimized APK
(20-50% size reduction)

15. Absolutely no code changes made by you.
Optimized APK
(20-50% size reduction)
Visual Studio 2019 16.3

17. .Forms

18. Xamarin.Forms 4.X Series
• Shell
• CheckBox
• Font Enhancements
• RelativeSource Binding
• Map Enhancements
• RefreshView
• So Much more!

19. CollectionView

20. CarouselView

21. XAML IntelliSense
Available in Visual Studio 2019 for Mac

22. IntelliCode
Available now in Visual Studio 2019 (Windows)

23. XAML Hot Reload
for Xamarin.Forms
Iterating on UI

24. XAML Hot Reload for Xamarin.Forms
Intelligent and resilient
No setup or code changes
Emulator, Simulator, or Device
Interact with your real data
Works with custom controls, third
party libraries and frameworks,
Shell, resources, and more!
Android or iOS

25. Demo:

26. How We Build
Xamarin.Essentials
@JamesMontemagno | jamont@microsoft.com

27. Native API Access

28. aka.ms/xamarinessentials
Flashlight
Geolocation
Preferences
Device Info
Device Display Info
Secure Settings
Accelerometer
Battery
Clipboard
Compass
Connectivity
Share
Email
File SystemGeocoding
Gyroscope
Magnetometer
Phone Dialer
Screen Lock
Sms
Text to Speech
Vibration
Xamarin.Essentials
Email Attachments
Open Files Share File
Detect Shake

29. Xamarin.Essentials1.3 available today!

31. Xamarin.Essentials1.3 available today!
+

32. How we build it
• Specification Process
• Multi-Targeting Development
• API Documentation
• Source Link Integration
• Continuous Integration & Delivery

33. Building Xamarin.Essentials

34. Thank you.
James
Montemagno
Principal Program Manager – Mobile Developer Tools,
Microsoft
motz@microsoft.com Montemagno.com @JamesMontemagno
Weekly development podcast
mergeconflict.fm
Weekly development show
xamarinshow.com