As the mobile landscape continues to expand and evolve managing multiple code bases in different programming languages and development tools can become a nightmare fast. In this session you will learn about the technology that Xamarin offers and how it works to enable developers to leverage a shared C# code base across all mobile platforms. James will walk you through developing, designing, deploying, and optimizing your first mobile apps for iOS, Android, and Windows from a single code base. You will walk away with the knowledge to build cross platform mobile app with C# features such as LINQ, async/await, events, and delegates and inside Visual Studio.

1. Create native iOS & Android apps
with Visual Studio and Xamarin
James Montemagno
@JamesMontemagno

2. Who’s this guy?
James
Montemagno
Principal Program Manager – Xamarin, Microsoft
motz@microsoft.com motzcod.es @JamesMontemagno
Weekly development podcast
mergeconflict.fm

3. Microsoft – Your Complete Mobile Solution

4. What is native?

6. Architecting mobile apps

7. Silo approach
iOS WindowsAndroid
Objective-C
Xcode
C#
Visual Studio
Java
Android Studio
No shared code • Many languages and development environments • Multiple teams

8. Write once, run anywhere
Lua
Javascript
Actionscript
HTML+CSS
Limited native API access • Slow performance • Poor user experience
App
generator

9. iOS C# UI Windows C# UIAndroid C# UI
Shared C# logic
Xamarin’s unique approach
Shared C# codebase • 100% native API access • High performance

10. Code sharing stats
Mac
iOS
Android
Windows Phone
iCircuit Touch Draw
86%
14%
72%
28%
70%
30%
61%
39%
88%
12%
76%
24%
90%
10%

11. Windows APIs
Microsoft.Phone Microsoft.Networking Windows.Storage Windows.Foundation Microsoft.Devices
System.Data System.Windows System.Numerics System.Core System.ServiceModel
System.Net System System.IO System.Linq System.Xml
C#

12. iOS – 100% API coverage
MapKit UIKit iBeacon CoreGraphics CoreMotion
System.Data System.Windows System.Numerics System.Core System.ServiceModel
System.Net System System.IO System.Linq System.Xml
C#

13. Android – 100% API coverage
Text-to-speech ActionBar Printing Framework Renderscript NFC
System.Data System.Windows System.Numerics System.Core System.ServiceModel
System.Net System System.IO System.Linq System.Xml
C#

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.
ARM
BINARY
Runs
natively
.APPAOT
.NET
C#
Bindings
.APKCompile
and Link
.NET
C#
Bindings
IL
+
JIT
Runs
natively

15. ✓ Always up-to-date
Same-day support:
• iOS 5
• iOS 6
• iOS 7
• iOS 8
• iOS 9
• iOS 10
Full support for:
• Apple Watch
• Apple TV
• Android Wear
• Amazon Fire TV
• Google Glass
• and much more

16. Visual Studio Xamarin Studio

17. Anything you can
do in Objective-C,
Swift, or Java can
be done in C#
and Visual Studio
with Xamarin

18. Xamarin Platform is included
for free in Visual Studio
Including Community Edition

19. Get Xamarin Today
Xamarin.com/Download

20. Open Source – open.xamarin.com

21. App building time

22. Sharing Code

23. 1 Assembly
Multiple Platforms
Including:
Xamarin.iOS and Xamarin.Android
Portable Class Libraries – Profile Based

24. Share with
ASP.NET Core
.NET Core
and More!
Portable Class Libraries - netstandard

25. Shared Projects

26. NuGet

27. Simplifying Development

28. Shared C# Logic
What about this stuff?

29. Platform Specific Code
What if we didn’t have to
write this code?
What if we could access it
from shared code?
UI+APIs UI + APIsUI + APIs
Battery
GPS
Lights
Notifications
Settings
Text To Speech
Battery
GPS
Lights
Notifications
Settings
Text To Speech
Battery
GPS
Lights
Notifications
Settings
Text To Speech

30. TextToSpeech
Speak(“Hello World”);
AVSpeechSynthesizer SpeechSynthesizer
A Better API

31. Plugins for Xamarin
Common API
Xamarin.com/plugins

32. Plugin Time

33. Build native UIs for iOS, Android, and Windows
from a single, shared C# codebase.
Meet Xamarin.Forms

34. Xamarin + Xamarin.Forms
Traditional Xamarin approach With Xamarin.Forms:
More code-sharing, all native
iOS C# UI Windows C# UIAndroid C# UI
Shared C# Logic Shared C# Logic
Xamarin.Forms

35. What’s included
✓ 40+ Pages, layouts, and controls
(Build from code behind or XAML)
✓ Two-way data binding
✓ Navigation
✓ Animation API
✓ Dependency Service
✓ Messaging Center
Shared C# Logic
Shared UI Code

36. Pages
Stack Absolute Relative Grid ContentView ScrollView Frame
Content MasterDetail Navigation Tabbed Carousel
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. Xamarin.Forms ecosystem

39. Native UI from shared code
<?xml version="1.0" encoding="UTF-8"?>
<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="MyApp.MainPage">
<TabbedPage.Children>
<ContentPage Title="Profile" Icon="Profile.png">
<StackLayout Spacing="20" Padding="20"
VerticalOptions="Center">
<Entry Placeholder="Username"
Text="{Binding Username}"/>
<Entry Placeholder="Password"
Text="{Binding Password}"
IsPassword="true"/>
<Button Text="Login" TextColor="White"
BackgroundColor="#77D065"
Command="{Binding LoginCommand}"/>
</StackLayout>
</ContentPage>
<ContentPage Title="Settings" Icon="Settings.png">
<!-- Settings -->
</ContentPage>
</TabbedPage.Children>
</TabbedPage>

40. App building time

41. Integration & Delivery

42. Test

43. Build

44. Distribute & Monitor

45. Microsoft & Xamarin: Your Complete Mobile Solution
Develop Test Build Distribute Monitor

46. Thank You!
James
Montemagno
Principal Program Manager – Xamarin, Microsoft
motz@microsoft.com motzcod.es @JamesMontemagno
Weekly development podcast
mergeconflict.fm
Q&A