Xamarin allows developers to write native iOS, Android, and Windows apps using C# with a shared codebase. It works by compiling C# code into the native platform code, translating .NET into Objective-C for iOS and bridges for Android. Xamarin.Forms provides common UI elements and pages that can be reused across platforms, reducing the amount of platform-specific code needed. Key pages include ContentPage, MasterDetailPage, NavigationPage, TabbedPage, and CarouselPage. Layouts like StackLayout, GridLayout, and RelativeLayout are used to compose user interface controls.

2.  Introduction to Xamarin
 Xamarin history
 How is Xamarin Working?
 Installing Xamarin
 What is Xamarin. Forms?
 More information related to Xamarin

3. Introduction to Xamarin

4. Introduction to Xamarin
Xamarin is a San Francisco, California based software company
created in May 2011 by the engineers that created Mono,
MonoTouch and Mono for Android .
With a C# shared codebase, developers can use Xamarin to write
native iOS, Android, and Windows apps with native user interface
and share code across multiple platforms.
Xamarin has over 505,000 developers in more than 120 countries
around the world as of February 2014.
Nat Friedman is the CEO and Co-founder.

5. Build native UIs for iOS, Android and Windows
from a single, shared C# codebase.

6. Xamarin History

7. Xamarin History
 The Mono open source project was launched on July 19, 2001. Ximian
was bought by Novell on August 4, 2003, which was then acquired
by Attachmate in April 2011.
 In December 2012, Xamarin released Xamarin.Mac.
 Xamarin 2.0 was released in February 2013 . Xamarin.iOS and
Xamarin.Android make it possible to do native iOS, Android and
Windows development in C#, with either Xamarin Studio or Visual
Studio.
 Introduced in Xamarin 3 on May 28, 2014 and allows one to use
portable controls subsets that are mapped to native controls of
Android, iOS and Windows Phone.

8. Xamarin History
 In 2014 Xamarin introduced Xamarin. Forms
 A common UI for mobile platforms
 A way of reusing ~90% of the code for all mobile platforms
 Contains a Xamarin XAML that is much like the MS XAML
Supports data-binding, dependency and attached
properties
 It all compiles to native code

9. How does Xamarin works?

10. How does Xamarin works?
 The apps created with Xamarin are compiled into native-code
 For iOS and OS X, Xamarin translates all the .NET code into
Objective-C and C code
This must happen on a MAC machine
 For Android it creates a set of bridges that are installed on the
Android device
Something like a CLR inside an Android device
 For Windows Phone, it just compiles to a Windows Phone app

11. Xamarin Installation

12. Xamarin Installation
 Installing Xamarin for all OSes is pretty easy:
 Just download Xamarin Platform Latest:
http://xamarin.com/platform
 This will set up almost everything needed to create apps
Downloads the necessary JRE, JDK and ADK for Android
Installs Xamarin Studio and Plugins for Visual Studio, if
missing

13. Xamarin Installation
 For Windows Phone and iOS there are some additional things to
do:
 Install Windows Phone SDK on Windows
Windows Phone apps can be created only with Visual
Studio
 Install Xcode on OS X
iOS apps can be created only on MAC machine
 For easier work with Android, install Xamarin Android Player
 Works with VirtualBox

14. Xamarin. Forms

15. Xamarin. Forms
 Xamarin. Forms is the common UI of Xamarin
 Share ~90% of the code base for each platform
Only the rest 10% are concrete for the platform
 How to create and run a Xamarin. Forms app?
 Create a new project, located at:
C# -> Mobile Apps -> Blank App
 Write code, select the wanted project as "Startup project"
 Run in the simulator

16. How does Xamarin.Forms fit in?
For software developers, the optimum strategy is to target more
than just one of these platforms. But that’s not easy. There are
three big obstacles:
 Problem 1: Different development environments
 For iOS development, XCode on the Mac.
 For Android development, Eclipse on a variety of platforms.
 For Windows Phone development, Visual Studio on the PC.

17.  Problem 2: Different programming interfaces:-For example, all
three platforms have something that lets the user toggle between two states:
 On the iPhone, it’s a “view” called UISwitch.
 On Android devices, it’s a “widget” called Switch.
 On Windows Phone, one possibility is a “control” called
ToggleSwitchButton from the Windows Phone Toolkit NuGet package.
 Problem 3: Different programming languages:-Developers have
some flexibility in choosing a programming language for each of these three
platforms
 Objective-C for the iPhone
 Java for Android devices
 C# for Windows Phone

18. Xamarin. Forms Pages
Xamarin. Forms Pages represent cross-platform mobile app screens.
Types of Page:-
 ContentPage
 MasterDetailPage
 NavigationPage
 TabbedPage
 CarouselPage

19. ContentPage
 A Content Page displays a single View, often a container such as
a StackLayout or a ScrollView

20. MasterDetailPage
The Master Detail Page displays two pages-one master and one
detail.
It is usually used to display menus or list of items.

21. NavigationPage
 A Page that manages the navigation and user-experience of a
stack of other pages.

22. TabbedPage
 The Tabbed Page allows two or more page to be represent in an
array of tabs shown either on the bottom of the screen(iOS) or
at the top of the screen(Android).

23. CarouselPage
 A carousel Page allows pages to be displayed using swipe
gestures.

24. Xamarin.Forms Layouts
Xamarin. Forms Layouts are used to compose user interface controls into logical
structures.
Layouts
 StackLayout
 AbsoluteLayout
 RelativeLayout
 GridLayout
 ContentView
 ScrollView
 Frame

25. StackLayout

26. AbsoluteLayout

27. RelativeLayout

28. GridLayout

29. ContentView

30. ScrollView

31. Frame

32. More information related to Xamarin

33. Xamarin.Forms

34. Questions?