处理应用激活

项目
07/05/2024

了解如何通过替代 Application.OnLaunched 方法来处理应用激活。

注意

有关在桌面应用中处理激活的信息，请参阅获取打包应用的激活信息。另请参阅 AppLifecycle — GitHub 上的丰富激活。

重写启动处理程序

当激活应用时，无论任何原因，系统都会发送 CoreApplicationView.Activated 事件。有关激活类型的列表，请参阅 ActivationKind 枚举。

Windows.UI.Xaml.Application 类定义可以重写的方法来处理各种激活类型。多个激活类型具有可替代的特定方法。对于其他激活类型，请重写 OnActivated 方法。

定义应用程序的类。

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

重写 OnLaunched 方法。每当用户启动应用时，将调用此方法。 LaunchActivatedEventArgs 参数包含应用的先前状态和激活参数。

注意

在 Windows 上，从“开始”磁贴或应用列表启动暂停的应用不会调用此方法。

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();
}

如果应用已暂停，则还原应用程序数据，然后终止

当用户切换到终止的应用时，系统会发送 Activated 事件，将 Kind 设置为 Launch，PreviousExecutionState 设置为 Terminated 或 ClosedByUser。 应用应加载其保存的应用程序数据并刷新其显示的内容。

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();
}

如果 PreviousExecutionState 的值为 NotRunning，则应用未能成功保存其应用程序数据，并且应用应重新开始，就好像它最初启动一样。

注解

注意

如果当前窗口上已设置内容，应用可以跳过初始化。你可以检查 LaunchActivatedEventArgs.TileId 属性以确定该应用是从主要磁贴启动还是从辅助磁贴启动，并可根据该信息，确定是应显示新的应用体验还是应恢复应用体验。

通过

处理应用激活

重写启动处理程序

如果应用已暂停，则还原应用程序数据，然后终止

注解

重要的 API

反馈

其他资源

通过

处理应用激活

重写启动处理程序

如果应用已暂停，则还原应用程序数据，然后终止

注解

重要的 API

相关主题

反馈

其他资源