.NET MAUI Android运行时添加的Entry长按无复制粘贴菜单问题

在Android平台的.NET MAUI应用中，直接放置在页面上的Entry控件长按可正常弹出复制/粘贴上下文菜单，但通过按钮点击事件动态将Entry添加到Window后，长按操作无法弹出上下文菜单，且原生Entry对应的ContextMenuCreated事件未被触发。

已验证该原生视图的LongClick和Touch事件可正常触发，Entry与Editor控件均存在此问题。

相关代码 #

XAML代码 #

<VerticalStackLayout>
    <Button  Text="Add entry to window" Clicked="OpenInWindow" HorizontalOptions="Fill" />
</VerticalStackLayout>

主页面C#代码 #

private void OpenInWindow(object sender, EventArgs e)
{
    Grid grid = new Grid();
    grid.BackgroundColor = Colors.LightGray;
    grid.HeightRequest = 100;
    grid.Padding = 100;
    Entry entry = new Entry() { BackgroundColor = Colors.Yellow, Text = "Entry", HeightRequest = 100 };
    grid.Children.Add(entry);
    entry.Loaded += Entry_Loaded;

#if ANDROID
    
    IWindowManager windowManager = WindowOverlayHelper.GetPlatformWindow()!.WindowManager!;
    this.GetWindowManagerLayoutParams();

    if (windowManager != null && WindowManagerLayoutParams != null)
    {
        IMauiContext? context = grid.Handler?.MauiContext ?? WindowOverlayHelper.window?.Handler?.MauiContext;
        PlatformView childView = grid.ToPlatform(context);
        windowManager!.AddView(childView, WindowManagerLayoutParams);
    }
#endif
}

private void Entry_Loaded(object? sender, EventArgs e)
{
#if ANDROID
    ((sender as Entry).Handler.PlatformView as AndroidX.AppCompat.Widget.AppCompatEditText).ContextMenuCreated += MainPage_ContextMenuCreated;
#endif
}

#if ANDROID
private void MainPage_ContextMenuCreated(object? sender, PlatformView.CreateContextMenuEventArgs e)
{
    System.Diagnostics.Debug.WriteLine("Context menu shown");
}

public WindowManagerLayoutParams? WindowManagerLayoutParams;

internal WindowManagerLayoutParams GetWindowManagerLayoutParams()
{
    if (this.WindowManagerLayoutParams == null)
    {
        this.WindowManagerLayoutParams = new WindowManagerLayoutParams();
        var decorViewContent = WindowOverlayHelper.decorViewContent;
        if (decorViewContent != null)
        {
            this.WindowManagerLayoutParams.Width = decorViewContent.Width;
            this.WindowManagerLayoutParams.Height = decorViewContent.Height;
        }
        this.WindowManagerLayoutParams.Format = Format.Translucent;
    }

    return this.WindowManagerLayoutParams;
}
#endif

WindowOverlayHelper类代码 #

public class WindowOverlayHelper
{
    #region Fields

    /// <summary>
    /// Gets the application window.
    /// </summary>
    internal static IWindow? window => GetActiveWindow();

#if ANDROID
    public static PlatformView? decorViewContent => GetPlatformWindow()?.DecorView;
#endif
    #endregion

    #region Private methods

    /// <summary>
    /// Helps to get the current active window.
    /// </summary>
    /// <returns> Current active window.</returns>
    private static IWindow? GetActiveWindow()
    {
        var windowCollection = (IPlatformApplication.Current?.Application as Microsoft.Maui.Controls.Application)?.Windows;
        if (windowCollection != null)
        {
            foreach (var window in windowCollection)
            {
                if (window != null)
                {
                    var propertyInfo = window.GetType().GetProperty("IsActivated", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
                    if (propertyInfo != null)
                    {
                        var isActivated = (bool)(propertyInfo?.GetValue(window))!;
                        if (isActivated)
                        {
                            return window;
                        }
                    }
                }
            }
        }

        return (IPlatformApplication.Current?.Application as Microsoft.Maui.Controls.Application)?.MainPage?.Window;
    }

#if ANDROID
    /// <summary>
    /// Gets the activity window for Android.
    /// </summary>
    /// <returns>Returns the window of the platform view.</returns>
    public static Window? GetPlatformWindow()
    {
        if (window != null && window.Handler is WindowHandler windowHandler && windowHandler.PlatformView is Activity platformActivity)
        {
            if (platformActivity == null || platformActivity.WindowManager == null
                || platformActivity.WindowManager.DefaultDisplay == null)
            {
                return null;
            }

            return platformActivity.Window;
        }

        return null;
    }
#endif
    #endregion
}

事件验证说明 #

已通过以下代码确认ContextMenuCreated事件未触发：

((Entry.Handler.PlatformView as AndroidX.AppCompat.Widget.AppCompatEditText).ContextMenuCreated += MainPage_ContextMenuCreated;

内容的提问来源于stack exchange，提问作者Anees S