The document discusses the latest updates and features for Xamarin developers, including the Xamarin Developer Summit, new performance enhancements in Visual Studio, and the introduction of Xamarin Essentials for cross-platform functionalities. It highlights improvements in developer productivity such as faster app startup times, XAML hot reload, and streamlined project creation. Furthermore, it showcases the capabilities of .NET for building applications across various platforms, emphasizing the use of C# for native API access and high-performance development.

1. Seattle Mobile .NET Developers!
• https://www.meetup.com/SeattleMobileDevelopers/

2. What’s New, Hot, &
Awesome for Xamarin
Developers
@JamesMontemagno | jamont@microsoft.com

3. https://devblogs.microsoft.com/xamarin/recapping-xamarin-developer-summit/

4. Xamarin Developer Summit
• 2 Days
• 2 Keynotes
• 30+ Sessions
• 300 Attendees
• Live Streamed to YT
• Videos on Demand
https://youtube.com/c/XamarinDevelopers

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

6. Shared C#
Business Logic • Platform APIs • User Interface
Xamarin App Architecture
Shared C# codebase • 100% native API access • High performance
.NET
C# C# C#

7. Delight Developers

8. Our proud tradition
• Native-first
• Anything you can do with Java, Objective-C, or Swift you can do
in Visual Studio with C# or F#
• Same-day releases for new platform capabilities
• Make mobile development delightful

9. aka.ms/xamarin-showcase

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

11. 100% Native & Optimized

12. Preview Available Today!
aka.ms/xamarin-ios13

13. Visual Studio 2019 16.3 Preview 2

14. Leaner Apps

15. xxhdpi
Base
xxxhdpi
xhdpihdpi
enfr
esx86
arm64armv7a

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

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

18. Faster App Startup

19. Execution modes
Xamarin.iOS does full Ahead Of Time
(AOT) compilation to produce an ARM
binary for Apple’s App Store.
Xamarin.Android takes advantage
of Just In Time (JIT) compilation on
the Android device.
ARM
BINARY
Runs
natively
.APPAOT
.NET
C#
Bindings
.APKCompile
and Link
.NET
C#
Bindings
IL
+
JIT
Runs
natively
AOT
?

20. Startup Tracing for Android

21. Startup Tracing

22. Startup Tracing

23. Startup Tracing for Android
Available in ALL versions of Visual Studio 2019 16.2

26. Cross-Platform Everything

27. 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

28. Xamarin.Essentials1.3-beta available today!

30. Xamarin.Essentials1.3-beta available today!
+

31. .Forms

32. An open source mobile UI framework
from Microsoft for building
iOS, Android, & Windows apps with .NET
from a single shared codebase.

34. Xamarin.Forms Pull Requests
2017
314
2019
457
1.5x
January-June

35. Community Pull Requests
2017
44
2019
116
2.6x
January-June

36. Common Controls

37. YOU

38. The Little Things
Entry/Editor
- IsSpellCheckEnabled
- MaxLength
- DetectReadingOrderFromCo
ntent (UWP)
- Text prediction options
- Autocapitalization
- AutoResizable Editor
- ButtonType for return
button
- Position and Color of caret
- Placeholder color
Label
- Bindable Spans
- Commandable Spans, Span
Gestures
- LineHeight
SearchBar
IsSpellCheckEnabled
ImeOptions
DesignModeEnabled
Android Bottom Tabs
WebView mixed content
(Android)
WebView evaluate JS
Binding Mode OneTime
ProgressBar colors
Switch colors
Slider colors
Hide scroll bars
Button AccessKey
ListView
- full width separators
- SelectionMode
Label MaxLines
Entry Read-Only
ImageButton
PinsSource on
Forms.Map
WebView Zoom Controls
(Android)
TabbedPage Icons (UWP)
Drop Shadows (iOS/UWP)
App DI Container Hooks
Button Padding
Page TitleView
BoxView rounded corners
WKWebView for iOS
CheckBox
RelativeSource Binding
Map ItemTemplate
BindableLayout
Bindable AutomationID
UIModalPresentationStyle
TabIndex
Pending
Label Padding
Polylines
RadioButton
Entry ClearButtonMode
CharacterSpacing
VSM Target
Label HTML
CameraView
MediaElement
FAB
…..

39. Visual & Material Design Renderers

40. Native Controls and the OS

41. Visual

42. Simplicity of Shell
• Single Container
• URI Routing
• Templating

43. Flyout Made Simple
<FlyoutItem Title="Browse" Icon="tab_feed.png">
<ShellContent ContentTemplate="{DataTemplate local:ItemsPage}" />
</FlyoutItem>
<FlyoutItem Title="About" Icon="tab_about.png">
<ShellContent ContentTemplate="{DataTemplate local:AboutPage}" />
</FlyoutItem>
<MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:views="clr-namespace:App6.Views"
x:Class="App6.Views.MainPage">
<MasterDetailPage.Master>
<views:MenuPage />
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
<NavigationPage>
<NavigationPage.Icon>
<OnPlatform x:TypeArguments="FileImageSource">
<On Platform="iOS" Value="tab_feed.png"/>
</OnPlatform>
</NavigationPage.Icon>
<x:Arguments>
<views:ItemsPage />
</x:Arguments>
</NavigationPage>
</MasterDetailPage.Detail>
</MasterDetailPage>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006
mc:Ignorable="d"
x:Class="App6.Views.MenuPage"
Title="Menu">
<StackLayout VerticalOptions="FillAndExpand">
<ListView x:Name="ListViewMenu"
HasUnevenRows="True">
<d:ListView.ItemsSource>
<x:Array Type="{x:Type x:String}">
<x:String>Item 1</x:String>
<x:String>Item 2</x:String>
</x:Array>
</d:ListView.ItemsSource>
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid Padding="10">
<Label Text="{Binding Title}" d:Text="{Binding .}"
FontSize="20"/>
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</ContentPage>

44. Shell UI
1 Page Bottom Tabs Bottom & Top Tabs FlyoutTop Tabs

45. CollectionView & CarouselView

46. How Do You See the World
Windows or Mac
iOS or Android
Native UI or Drawn
Forms or Classic
XAML or C#
MVVM or Reactive or MVU

47. Embrace the Best of All Worlds
Windows AND Mac
iOS AND Android
Native UI AND Drawn
Forms AND Classic
XAML AND C#
MVVM AND Reactive AND MVU

48. .Forms

49. Developer Productivity

50. Get Started Faster

51. Install Faster, Load Faster
• Faster solution creation
• Faster solution/project load
Visual Studio 2017 Visual Studio 2019

52. Code Faster

53. Optimized Code Editor
Available now in Visual Studio 2019 for Mac

54. XAML IntelliSense
Available in Preview in Visual Studio 2019 for Mac

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

56. Android XML + Designer

57. And in the next release of Visual Studio:.AXML .XML
Android XML

58. Build Faster

59. • 800x480 display at 252ppi
• 256 MB RAM
• 1GHz
• Adreno 200 GPU
• 5 megapixel camera
Nexus One (2010)
• 1080x2160 resolution at 443 ppi
• 4GB RAM
• Octa-core (4x2.5 GHz, 4x1.6GHz)
• GeekScore: 2,353 single core, 7,628 multi-core)
• Dual 12MP wide-angle & telephoto cameras
• Adreno 630 GPU
• 12.2 MP camera
Pixel 3 (2018)

60. Today, apps are more complicated

61. 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%

62. Iterate Faster

63. Announcing
XAML Hot Reload
for Xamarin.Forms
Iterating on UI

64. Demo:

65. 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

66. Private Preview Available Today
https://aka.ms/XAMLHotReload

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

68. .Forms

69. 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