Behandeln der App-Aktivierung

Erfahren Sie, wie Sie die App-Aktivierung behandeln, indem Sie die Application.OnLaunched-Methode überschreiben.

Überschreiben des Starthandlers

Wenn eine App aktiviert wird, sendet das System aus irgendeinem Grund das CoreApplicationView.Activated-Ereignis. Eine Liste der Aktivierungstypen finden Sie in der ActivationKind-Aufzählung.

Die Windows.UI.Xaml.Application-Klasse definiert Methoden, die Sie überschreiben können, um die verschiedenen Aktivierungstypen zu behandeln. Einige der Aktivierungstypen weisen eine bestimmte Methode auf, die Sie außer Kraft setzen können. Überschreiben Sie für die anderen Aktivierungstypen die OnActivated-Methode.

Definieren Sie die Klasse für Ihre Anwendung.

<Application
    x:Class="AppName.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

Überschreiben Sie die OnLaunched-Methode. Diese Methode wird immer aufgerufen, wenn der Benutzer die App startet. Der Parameter LaunchActivatedEventArgs enthält den vorherigen Zustand Ihrer App und die Aktivierungsargumente.

using System;
using Windows.ApplicationModel.Activation;
using Windows.UI.Xaml;

namespace AppName
{
   public partial class App
   {
      async protected override void OnLaunched(LaunchActivatedEventArgs args)
      {
         EnsurePageCreatedAndActivate();
      }

      // Creates the MainPage if it isn't already created.  Also activates
      // the window so it takes foreground and input focus.
      private MainPage EnsurePageCreatedAndActivate()
      {
         if (Window.Current.Content == null)
         {
             Window.Current.Content = new MainPage();
         }

         Window.Current.Activate();
         return Window.Current.Content as MainPage;
      }
   }
}

Class App
   Protected Overrides Sub OnLaunched(args As LaunchActivatedEventArgs)
      Window.Current.Content = New MainPage()
      Window.Current.Activate()
   End Sub
End Class

...
#include "MainPage.h"
#include "winrt/Windows.ApplicationModel.Activation.h"
#include "winrt/Windows.UI.Xaml.h"
#include "winrt/Windows.UI.Xaml.Controls.h"
...
using namespace winrt;
using namespace Windows::ApplicationModel::Activation;
using namespace Windows::UI::Xaml;
using namespace Windows::UI::Xaml::Controls;

struct App : AppT<App>
{
    App();

    /// <summary>
    /// Invoked when the application is launched normally by the end user.  Other entry points
    /// will be used such as when the application is launched to open a specific file.
    /// </summary>
    /// <param name="e">Details about the launch request and process.</param>
    void OnLaunched(LaunchActivatedEventArgs const& e)
    {
        Frame rootFrame{ nullptr };
        auto content = Window::Current().Content();
        if (content)
        {
            rootFrame = content.try_as<Frame>();
        }

        // Do not repeat app initialization when the Window already has content,
        // just ensure that the window is active
        if (rootFrame == nullptr)
        {
            // Create a Frame to act as the navigation context and associate it with
            // a SuspensionManager key
            rootFrame = Frame();

            rootFrame.NavigationFailed({ this, &App::OnNavigationFailed });

            if (e.PreviousExecutionState() == ApplicationExecutionState::Terminated)
            {
                // Restore the saved session state only when appropriate, scheduling the
                // final launch steps after the restore is complete
            }

            if (e.PrelaunchActivated() == false)
            {
                if (rootFrame.Content() == nullptr)
                {
                    // When the navigation stack isn't restored navigate to the first page,
                    // configuring the new page by passing required information as a navigation
                    // parameter
                    rootFrame.Navigate(xaml_typename<BlankApp1::MainPage>(), box_value(e.Arguments()));
                }
                // Place the frame in the current Window
                Window::Current().Content(rootFrame);
                // Ensure the current window is active
                Window::Current().Activate();
            }
        }
        else
        {
            if (e.PrelaunchActivated() == false)
            {
                if (rootFrame.Content() == nullptr)
                {
                    // When the navigation stack isn't restored navigate to the first page,
                    // configuring the new page by passing required information as a navigation
                    // parameter
                    rootFrame.Navigate(xaml_typename<BlankApp1::MainPage>(), box_value(e.Arguments()));
                }
                // Ensure the current window is active
                Window::Current().Activate();
            }
        }
    }
};

using namespace Windows::ApplicationModel::Activation;
using namespace Windows::Foundation;
using namespace Windows::UI::Xaml;
using namespace AppName;
void App::OnLaunched(LaunchActivatedEventArgs^ args)
{
   EnsurePageCreatedAndActivate();
}

// Creates the MainPage if it isn't already created.  Also activates
// the window so it takes foreground and input focus.
void App::EnsurePageCreatedAndActivate()
{
    if (_mainPage == nullptr)
    {
        // Save the MainPage for use if we get activated later
        _mainPage = ref new MainPage();
    }
    Window::Current->Content = _mainPage;
    Window::Current->Activate();
}

Wiederherstellen von Anwendungsdaten, wenn die App angehalten wurde, dann beendet

Wenn der Benutzer zu Ihrer beendeten App wechselt, sendet das System das Activated-Ereignis, wobei "Kind" auf "Launch" und "PreviousExecutionState" auf "Terminated" oder "ClosedByUser" festgelegt ist. Die App sollte die gespeicherten Anwendungsdaten laden und den angezeigten Inhalt aktualisieren.

async protected override void OnLaunched(LaunchActivatedEventArgs args)
{
   if (args.PreviousExecutionState == ApplicationExecutionState.Terminated ||
       args.PreviousExecutionState == ApplicationExecutionState.ClosedByUser)
   {
      // TODO: Populate the UI with the previously saved application data
   }
   else
   {
      // TODO: Populate the UI with defaults
   }

   EnsurePageCreatedAndActivate();
}

Protected Overrides Sub OnLaunched(args As Windows.ApplicationModel.Activation.LaunchActivatedEventArgs)
   Dim restoreState As Boolean = False

   Select Case args.PreviousExecutionState
      Case ApplicationExecutionState.Terminated
         ' TODO: Populate the UI with the previously saved application data
         restoreState = True
      Case ApplicationExecutionState.ClosedByUser
         ' TODO: Populate the UI with the previously saved application data
         restoreState = True
      Case Else
         ' TODO: Populate the UI with defaults
   End Select

   Window.Current.Content = New MainPage(restoreState)
   Window.Current.Activate()
End Sub

void App::OnLaunched(Windows::ApplicationModel::Activation::LaunchActivatedEventArgs const& e)
{
    if (e.PreviousExecutionState() == ApplicationExecutionState::Terminated ||
        e.PreviousExecutionState() == ApplicationExecutionState::ClosedByUser)
    {
        // Populate the UI with the previously saved application data.
    }
    else
    {
        // Populate the UI with defaults.
    }
    ...
}

void App::OnLaunched(Windows::ApplicationModel::Activation::LaunchActivatedEventArgs^ args)
{
   if (args->PreviousExecutionState == ApplicationExecutionState::Terminated ||
       args->PreviousExecutionState == ApplicationExecutionState::ClosedByUser)
   {
      // TODO: Populate the UI with the previously saved application data
   }
   else
   {
      // TODO: Populate the UI with defaults
   }

   EnsurePageCreatedAndActivate();
}

Wenn der Wert von PreviousExecutionState notRunning lautet, konnte die App ihre Anwendungsdaten nicht erfolgreich speichern, und die App sollte von vorne beginnen, als ob sie ursprünglich gestartet wurde.

Hinweise

Wichtige APIs

• Windows.ApplicationModel.Activation
• Windows.UI.Xaml.Application

Zugehörige Themen

• Behandeln des Anhaltens von Apps
• Behandeln der App-Fortsetzung
• Richtlinien für das Anhalten und Fortsetzen von Apps
• App-Lebenszyklus