introduction to universal apps
TRANSCRIPT
Introduction to Universal Apps
Jaliya UdagedaraMVP (Visual C#)
Windows Store App
Windows Phone Store App
Windows Runtime Apps
Windows Runtime contains more than 90% of Windows
Phone Runtime
protected override async void OnLaunched(LaunchActivatedEventArgs e){
ApplicationExecutionState state = e.PreviousExecutionState;
ActivationKind kind = e.Kind;
///...}
• 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)
private async void OnSuspending(object sender, SuspendingEventArgs e){
var deferral = e.SuspendingOperation.GetDeferral();
await SuspensionManager.SaveAsync(); deferral.Complete();
}
• 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
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}
Window
Frame
PageWindow
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 activeif (rootFrame == null){
// Create a Frame to act as the navigation context and navigate// to the first pagerootFrame = new Frame();
...
// Place the frame in the current WindowWindow.Current.Content = rootFrame;
}
if (rootFrame.Content == null){
// Navigate to the first pagerootFrame.Navigate(typeof(MainPage), e.Arguments);
}// Ensure the current window is activeWindow.Current.Activate();
}
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);
}
private void btnGoBack_Click(object sender, RoutedEventArgs e)
{if (this.Frame.CanGoBack)
this.Frame.GoBack();}
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();
}}
Add Windows Phone 8.1 or Windows 8.1
Context Switcher in the Editor
Context Switcher in the XAML Editor
Better IntelliSense
Devices Window
Switching Startup Projects
• Code Sharing Strategies
• Linked Files
• PCL
• Shared Projects
• XAML Sharing Strategies
• Solving Styles
