.NET MAUI Android平台Entry控件无法隐藏软键盘求助

我在.NET MAUI Android平台开发自定义控件GSLEntryControl时，遇到Entry控件获焦后无法隐藏软键盘的问题。已尝试以下方案但均未生效：

• 在IsInFocus属性的setter中配置Android平台EntryHandler，设置ShowSoftInputOnFocus=false；
• 在Entry_Focused事件及IsInFocus逻辑中调用HideSoftInputAsync(CancellationToken.None)方法；
• 调整Dispatcher的异步实现甚至移除Dispatcher。

C#代码 #

using CommunityToolkit.Maui.Core.Platform;
using CommunityToolkit.Mvvm.Input;
using System.Diagnostics;

namespace GSL.Presentation.CustomControls;

public partial class GSLEntryControl : ContentView
{

    public GSLEntryControl()
    {
        try
        {
            InitializeComponent();
        }
        catch (Exception ex)
        {
            Debug.WriteLine($"GEORGE: Exception: {ex}");
        }
    }

    [RelayCommand]
    private void ClearText()
    {
        Text = string.Empty;
    }


    // All the updates will be done in the property set. 
    public static readonly BindableProperty IsInFocusProperty = BindableProperty.Create(
        nameof(IsInFocus),
        typeof(bool),
        typeof(GSLEntryControl),
        false,
        BindingMode.OneWay,
        propertyChanged: (bindable, oldValue, newValue) =>
        {
            Debug.WriteLine("George: IsInFocusProperty Start");
            if (bindable is GSLEntryControl editText)
            {
                editText.IsInFocus = (bool)newValue;
            }
            Debug.WriteLine("George: IsInFocusProperty End");
        });

    public string _text = string.Empty;
    public string Text
    {
        get
        {
            return _text;
        }
        set
        {
            //Run all this code on the main UI Thread 
            Application.Current.Dispatcher.Dispatch(() =>
            {
                Debug.WriteLine("GEORGE: Text Set Start");
                _text = value;
                //IsClearButtonVisible = _text?.Length > 0;
                //SetBorderColor();
                Debug.WriteLine("GEORGE: Text Set End");
            });
        }
    }


    private bool _isInFocus = false;
    public bool IsInFocus
    {
        get
        {
            return _isInFocus;
        }
        set
        {
            Debug.WriteLine($"GEORGE: IsInFocus Set Start.  Value: {value}");
            _isInFocus = value;

            Application.Current.Dispatcher.Dispatch(async () =>
            {

                if (_isInFocus)
                {
                    var tempResult = gslEntry.Focus();

                    Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping("MyCustomization", (handler, view) =>
                    {
#if ANDROID
                        handler.PlatformView.ShowSoftInputOnFocus = false;
#endif
                    });
                    //var workResult = await gslEntry.HideSoftInputAsync(CancellationToken.None);
                    //Debug.WriteLine($"GEORGE: Focus ShowKeyboard Result: {workResult}");

                    Debug.WriteLine($"GEORGE: Focus-KeyBoardShown: {gslEntry.IsSoftKeyboardShowing()}");
                }
                else
                {
                    gslEntry.Unfocus();
                }
                //SetBorderColor();
                Debug.WriteLine("GEORGE: IsInFocus Set End");
            });
        }
    }

    //When entry is focused, change border color to blue
    async void Entry_Focused(object sender, FocusEventArgs e)
    {
        Debug.WriteLine("GEORGE: Entry_Focused start");
        //EntryFocused?.Invoke(sender, e);

        bool workResult = false;
        Application.Current.Dispatcher.Dispatch(async () =>
        {
            workResult = await gslEntry.HideSoftInputAsync(CancellationToken.None);
            Debug.WriteLine($"GEORGE: Focus ShowKeyboard Result: {workResult}");
        });

        Debug.WriteLine("GEORGE: Entry_Focused end");
    }
}

XAML代码 #

<ContentView.Resources>
    <ResourceDictionary>
        <mct:InvertedBoolConverter x:Key="InvertedBoolConverter"/>
    </ResourceDictionary>

</ContentView.Resources>

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="auto"/>
        <RowDefinition Height="auto"/>
    </Grid.RowDefinitions>

    <Border x:Name="entryFrame" 
            StrokeThickness="2" 
            Padding="0" 
            HeightRequest="50" 
            VerticalOptions="CenterAndExpand" 
            HorizontalOptions="FillAndExpand"  
            Grid.Row="0" 
            Grid.Column="0" 
            Grid.ColumnSpan="2">

        <Grid HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" ColumnDefinitions="*,auto">
            <Entry x:Name="gslEntry" 
                       Margin="10,0,0,0" 
                       ReturnType="Done" 
                       Keyboard="Text" 
                       TextTransform="Uppercase" 
                       FontSize="16" 
                       Text="{Binding Text,Mode=TwoWay}" 
                       IsEnabled="True" 
                       Placeholder="" 
                       IsPassword="False" 
                       VerticalOptions="CenterAndExpand" 
                       HorizontalOptions="FillAndExpand" 
                   Grid.Column="0"/>


            <!-- Clear Button -->
            <ImageButton Source="ic_delete.xml" 
                     x:Name="clearButton" 
                     WidthRequest="32" 
                     HeightRequest="32" 
                     VerticalOptions="Center" 
                     HorizontalOptions="End" 
                     Margin="0,0,5,0" 
                     Command="{Binding ClearTextCommand}" 
                     Grid.Column="1"/>
        </Grid>
    </Border>

    <Label x:Name="invalidLabel" 
           Text="Error" 
           Margin="5,0,0,0" 
           HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" 
           IsVisible="false" 
           Style="{StaticResource ValidationErrorLabelStyle}" 
           Grid.Row="1"/>
</Grid>

内容的提问来源于stack exchange，提问作者George M Ceaser Jr