1. Maximizing Reach Through Cross-Platform Mobile Development
By Krystin Stutesman

2. Silo Approach
iOS
Android
Windows
Objective-C
Xcode
Java
Android Studio C#
Visual Studio
Multiple Teams
Multiple Code Bases
Expensive & Slow
Positive = Great apps delivered to user’s platform
Negative = Development hampered by multiple code bases & fragmentation
No shared code • Many languages & development environments • Multiple teams

3. Write Once, Run Anywhere
2/5/2018
Write Once, Run Anywhere
App Generator
Lua
Javascript
Actionscript
HTML+CSS
Unhappy Users
Unhappy Developers
Increase in Abandoned Apps
Limited to what is implemented
Limited native API access • Slow performance • Poor user experience
© 2014 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

4. Xamarin’s Unique Approach
Build 2015
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Xamarin’s Unique Approach
iOS C# UI
Windows C# UI
Android C# UI
Shared C# Mobile
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
Shared C# codebase • 100% native API access • High performance
© 2015 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

5. Xamarin’s Unique Approach
Build 2015
2/5/ :23 AM
Xamarin’s Unique Approach
iOS C# UI
Windows C# UI
Android C# UI
Shared C# Mobile
C# Server
Linux/Mono
CoreCLR
Azure
Shared C# Client/Server
With Xamarin it just isn’t your front end in C# it is your full backend server as well. With Azure or even on Linux running Mono or the CoreCLR your app is fully C# end to end!
Shared C# codebase • 100% native API access • High performance
© 2015 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

6. Native User Interfaces
2/5/2018
Native User Interfaces
Native API Access
Native Performance
A native app needs a lot of things, but three important ones stick out:
Native User Interface: Apps need to look and act correct per platform.
Full SDK Access: As a developer we need to add the latest and greatest features
Native Performance: Needs to be fast and fluid
© 2014 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

7. Windows APIs Microsoft.Phone Windows.Storage Microsoft.Devices
Microsoft.Networking
Windows.Storage
Windows.Foundation
Microsoft.Devices
System.Net
System
System.IO
System.Linq
System.Xml
System.Data
System.Windows
System.Numerics
System.Core
System.ServiceModel
Windows developers… Will be comfortable and easy to switch to Xamarin
System.IO, Linq, Runtime
All .NET libraries… Download SDK for WinPhone to get native APIs

8. iOS – 100% API Coverage MapKit UIKit iBeacon CoreGraphics CoreMotion
Build 2015
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iOS – 100% API Coverage
MapKit
UIKit
iBeacon
CoreGraphics
CoreMotion
System.Net
System
System.IO
System.Linq
System.Xml
System.Data
System.Windows
System.Numerics
System.Core
System.ServiceModel
Accessing native iOS APIs but they are still in C#
C# bindings for iOS
© 2015 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

9. Android – 100% API Coverage
Build 2015
2/5/ :23 AM
Android – 100% API Coverage
Text-to-speech
ActionBar
Printing Framework
Renderscript
NFC
System.Net
System
System.IO
System.Linq
System.Xml
System.Data
System.Windows
System.Numerics
System.Core
System.ServiceModel
© 2015 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

10. ✓Always Up-to-Date Same-day support: Full support for: iOS 5 iOS 6
Apple Watch
Android Wear
Amazon Fire TV
Google Glass
and much more
Was concerned about support for OS versions and extensions

11. Visual Studio Integration
iOS Designer

12. Visual Studio Integration
Android Designer

13. Visual Studio Integration
Xamarin.com/Download

14. 2/5/2018
Anything you can do in Objective-C, Swift, or Java can be done in C# and Visual Studio with Xamarin.
© 2014 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

15. Meet Xamarin.Forms
Xamarin Forms is a new set of APIs allowing you to quickly and easily write shared User Interface code that is still rendered natively on each platform, while still providing direct access to the underlying SDKs if you need it.
Build native UIs for iOS, Android, and Windows Phone from a single, shared C# codebase.

16. Xamarin + Xamarin.Forms
Shared C# Backend
Shared UI Code
iOS C# UI
Windows C# UI
Android C# UI
Shared C# Backend
We see here the Xamarin approach we talked about earlier
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
Traditional Xamarin Approach
With Xamarin.Forms: More code-sharing, all native

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

18. Native UI from shared code
<?xml version="1.0" encoding="UTF-8"?>
<TabbedPage xmlns="
xmlns:x="
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 -->
</TabbedPage.Children>
Here is a quick example of a login page:
Notice the data binding on the Entries Text fields. Additionally, there is a LoginCommand.
Each has a native user interface

19. Platform Customization
Might want iOS or Android to have different looks
i.e. 20 px on iOS top for status bar

20. Demo Xamarin.Forms Apple Watch

21. Xamarin – Your Complete Mobile Solution
Build 2015
2/5/ :23 AM
Xamarin – Your Complete Mobile Solution
DESIGN – DEVELOP - INTEGRATE
TEST
MONITOR
LEARN
© 2015 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

22. Get Started Today xamarin.com
Get started today with free 30 day trial of Xamarin at xamarin.com

23. Free 30 Day Trial - xamarin.com/university
Unrivaled Mobile Development Training
Live unlimited mobile development training from mobile experts, in your time-zone, on your schedule, and as often as you'd like.
Free 30 Day Trial - xamarin.com/university

24. Thank you! Questions? Krystin Stutesman Developer Evangelist, Xamarin
2/5/2018
Thank you! Questions?
Krystin Stutesman
Developer Evangelist, Xamarin
@officialkrystin
© 2014 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.