The document provides an overview of Universal Windows Apps, specifically focusing on app lifecycle events such as launching, suspending, and resuming, along with code examples in Visual C#. It discusses the importance of managing the app's state during suspension and provides guidelines on navigating within the app. Additionally, it touches on code sharing strategies for Windows Phone and Windows Store apps.

1. Introduction to Universal
Apps
Jaliya Udagedara
MVP (Visual C#)

7. Windows Store App
Windows Phone Store App

8. Windows Runtime Apps

10. Windows Runtime contains
more than 90% of Windows
Phone Runtime

15. protected override async void OnLaunched(LaunchActivatedEventArgs e)
{
ApplicationExecutionState state = e.PreviousExecutionState;
ActivationKind kind = e.Kind;
///...
}

16. • App is suspended
• All code stopped
• No timers tick
• No events fire
• Process still alive and in memory
• Code has a chance to respond
(next slide)

17. private async void OnSuspending(object sender, SuspendingEventArgs e)
{
var deferral = e.SuspendingOperation.GetDeferral();
await SuspensionManager.SaveAsync();
deferral.Complete();
}

18. • Same app is resumed
• Same process, same memory so
values of variables are intact
• All code runs
• Code has a chance to respond.
Launch Switcher

19. public App()
{
this.InitializeComponent();
this.Suspending += this.OnSuspending;
this.Resuming += App_Resuming;
}
void App_Resuming(object sender, object e)
{
// TODO: whatever you need to do to resume your app
}

20. http://bit.ly/w8Resuming

24. Window
Frame
Page
Window

25. protected override void OnLaunched(LaunchActivatedEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
// Do not repeat app initialization when the Window already has
// content, just ensure that the window is active
if (rootFrame == null)
{
// Create a Frame to act as the navigation context and navigate
// to the first page
rootFrame = new Frame();
...
// Place the frame in the current Window
Window.Current.Content = rootFrame;
}
if (rootFrame.Content == null)
{
// Navigate to the first page
rootFrame.Navigate(typeof(MainPage), e.Arguments);
}
// Ensure the current window is active
Window.Current.Activate();
}

26. private void itemListView_ItemClick(object sender, ItemClickEventArgs e)
{
// Navigate to the appropriate destination page, configuring the new page
// by passing required information as a navigation parameter
var itemId = ((MyListViewItem)e.ClickedItem).UniqueId;
Frame.Navigate(typeof(MyDetailPage), itemId);
}

27. private void btnGoBack_Click(
object sender, RoutedEventArgs e)
{
if (this.Frame.CanGoBack)
this.Frame.GoBack();
}

30. public sealed partial class SecondPage : Page
{
...
protected override void OnNavigatedTo(NavigationEventArgs e)
{
Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
Windows.Phone.UI.Input.HardwareButtons.BackPressed -= HardwareButtons_BackPressed;
}
async void HardwareButtons_BackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e)
{
e.Handled = true; // We've handled this button press
if (SecondaryUI.Visibility == Visibility.Visible ) // If the secondary UI is visible, hide it
{
FadeOutSecondaryStoryboard.Begin();
}
else
{
if (Frame.CanGoBack)
Frame.GoBack();
}
}

36. Add Windows Phone 8.1 or Windows 8.1

37. Context Switcher in the Editor

38. Context Switcher in the XAML Editor

39. Better IntelliSense

40. Devices Window

41. Switching Startup Projects

45. • Code Sharing Strategies
• Linked Files
• PCL
• Shared Projects

49. • XAML Sharing Strategies
• Solving Styles

51. Thank You!
http://www.jaliyaudagedara.blogspot.com/