Xamarin enables C# devs to become native iOS, Android, and Windows mobile app dev overnight. Learn how to leverage your existing .NET and C# skills to create iOS and Android mobile apps in Visual Studio. In addition to allowing you to write your iOS and Android apps in C#, Xamarin lets you reuse existing .NET libraries and share your business logic across iOS, Android, and Windows apps. During this session we cover the Xamarin platform and how to create native iOS, Android, and Windows apps in C#. See what’s new and next for Xamarin development inside of Visual Studio. Moreover, we focus on the code, with several live coding adventures throughout the entire session and show you the latest and greatest in native cross-platform development.

2. 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

3. Essentials for mobile success
Intelligent cloudBuild, test, distribute, learnBeautiful native apps

4. DESKTOP WEB CLOUD MOBILE GAMING IoT AI
.NET
Your platform for building anything

5. Xamarin: Anything you can do in Objective-C,
Swift, or Java, you can do in C# and Visual Studio
• Native user interface
• High-fidelity API access
• Native performance

6. iOS C# UI Windows C# UIAndroid C# UI
Shared C# logic
.NET for Mobile Apps
Shared C# codebase • 100% native API access • High performance

7. Windows APIs

8. iOS—100% API coverage
MapKit UIKit iBeacon CoreGraphics CoreMotion

9. Android—100% API coverage
Text-to-speech ActionBar Printing Framework Renderscript NFC

11. .NET Standard brings it all together
.NET Standard allows
sharing code, binaries
and skills between
.NET client, server and
all of its flavors.
.NET Standard provides
a specification for any
platform to implement
LIBRARIES
INFRASTRUCTURE
.NET STANDARD
DESKTOP WEB CLOUD MOBILE GAMING IoT AI

12. Xamarin
3 Native User Interfaces
Shared App Logic
iOS C# Android C#
Shared C# logic
Windows C#
Shared C# logic
Shared UI Code
Shared Native User Interfaces
Shared App Logic

13. Code sharing
stats
Mac
iOS
Android
Windows
iCircuit Touch Draw
86%
14%
72%
28%
70%
30%
61%39%
88%
12%
76%
24%
90%
10%
Evolve App
(Xamarin.Forms)
91%
9%
93%
7%
98%
2%

14. Native performance
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.

15. Xamarin Live Player

16. Xamarin Live Player Setup

20. Shared C# Backend
Geolocation Geolocation Geolocation
Compass Compass Compass
Keystore Keystore Keystore

21. SharedPreferences
Preferences.Get(“my_key”, 0);
NSUserDefaults ApplicationData

22. Xamarin.Essentials
aka.ms/xamarinessentials
Flashlight
Geolocation
Preferences
Device Info
Device Display Info
Secure Settings
Accelerometer
Battery
Clipboard
Compass
Connectivity
Data Transfer
Email
File SystemGeocoding
Gyroscope
Magnetometer
Phone Dialer
Screen Lock
Sms
Text to Speech
Vibration

25. Infrastructure
designed for Scale

28. https://github.com/xamarinhq/app-geocontacts

37. Without Eager Deploy With Eager Deploy
First Run
Master Detail App
106 seconds 81 seconds
First Run
Smart Hotel 360
179 seconds 161 seconds

38. † Google Play Services available if you download fishy binary from a random internet site, run an installer,
and copy files to the right places. YMMV.

56. ResourceDictionary
Improvements

72. https://github.com/fsprojects/Elmish.XamarinForms
/// The messages dispatched by the view
type Msg = |
/// The model from which the view is generated
type Model = { : }
/// Returns the initial state
let init() = { =false }
/// The funtion to update the view
let update msg Msg model Model =
match with | -> { with = true }
/// The view function giving updated content for the page
let view model Model dispatch =
if then
="I was pressed!"
else
="Press Me!" = fun ->
type App () =
inherit ()
let runner =
|>
|>
|>

74. https://github.com/praeclarum/Ooui
http://ooui.mecha.parts/

75. soundbite.fm

77. <?xml version="1.0" encoding="UTF-8" ?>
<Shell xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:Xamarin.Store"
x:Class="Xamarin.StoreDemoApp"
Route="s">
<Shell.FlyoutHeader>
<local:HeaderView />
</Shell.FlyoutHeader>
<Shell.MenuItems>
<MenuItem x:Name="preferencesMenuItem" Text="Preferences" Icon="prefs.png" />
<MenuItem x:Name="logOutMenuItem" Text="Logout" Icon="logout.png" />
</Shell.MenuItems>
<ShellItem Route="home" Title="Home" Icon="home.png" GroupBehavior="ShowTabs">
<ShellTabItem Route="updates" Title="Home" Icon="home.png"
ContentTemplate="{DataTemplate local:HomePage}" />
<ShellTabItem Route="games" Title="Games" Icon="games.png"
ContentTemplate="{DataTemplate local:GamesPage}" />
<ShellTabItem Route="settings" Title="Settings" Icon="games.png"
ContentTemplate="{DataTemplate local:SettingsPage}" />
</ShellItem>
<ShellItem Route="apps" Title="Media" Icon="media.png">
<ShellTabItem Route="books" Title="Books" Icon="books.png"
ContentTemplate="{DataTemplate local:BooksPage}" />
<ShellTabItem Route="music" Title="Music" Icon="music.png"
ContentTemplate="{DataTemplate local:MusicPage}" />
<ShellTabItem Route="movies" Title="Movies" Icon="movies.png"
ContentTemplate="{DataTemplate local:MoviesPage}" />
</ShellItem>
</Shell>

79. 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