.NET MAUI Android Release模式自定义视图导航崩溃问题求助

我的.NET MAUI Android应用仅在Release模式下崩溃，几乎每次导航到包含自定义视图MyLinkView的页面时都会触发。

MyLinkView代码 #

XAML代码 #

<ContentView.Content>
    <Label
        x:Name="LabelControl"
        Style="{Binding TextStyle, Source={x:Reference MyLabelView}}"/>
</ContentView.Content>

后台代码 #

public static readonly BindableProperty TextProperty = BindableProperty.Create(propertyName: nameof(Text),
    returnType: typeof(string), declaringType: typeof(MyLinkView), defaultValue: string.Empty, propertyChanged: OnTextPropertyChanged);

public string Text
{
    get => (string)GetValue(TextProperty);
    set => SetValue(TextProperty, value);
}

public static readonly BindableProperty PressCommandProperty = BindableProperty.Create(
    propertyName: nameof(PressCommand), returnType: typeof(IAsyncCommand<MyObj>), declaringType: typeof(MyLinkView), defaultValue: null);

public IAsyncCommand<MyObj> PressCommand
{
    get => (IAsyncCommand<MyObj>)GetValue(PressCommandProperty);
    set => SetValue(PressCommandProperty, value);
}

private async static void OnTextPropertyChanged(BindableObject bindable, object oldValue, object newValue)
{
    try
    {
        if (!(bindable is MyLinkView view))
            return;

        if (newValue is null || newValue is string str && string.IsNullOrWhiteSpace(str))
        {
            view.LabelControl.FormattedText = string.Empty;
        }
        else if (newValue is string text)
        {
            var formattedText = new FormattedString();
            foreach (var item in MyLinkHelper.ProcessString(text))
            {
                var span = new Span { Text = item.Text };
                var hasLink = !string.IsNullOrEmpty(item.Link);
                span.GestureRecognizers.Add(new TapGestureRecognizer
                {
                    Command = view.PressCommand,
                    CommandParameter = view.PressCommandParameter
                });
                formattedText.Spans.Add(span);
            }

            view.LabelControl.FormattedText = formattedText;
        }

    }
    catch (Exception ex)
    {
        await App.Current.MainPage.DisplayAlert("Alert", ex.Message, "OK");
    }
}

错误信息 #

AppCenter上报的错误：

androidx.core.view.ViewCompat$Api29Impl.getAccessibilityDelegate
ViewCompat.java, line 5436
Java.Lang.NullPointerException: Attempt to invoke virtual method 'android.view.View$AccessibilityDelegate android.view.View.getAccessibilityDelegate()' on a null object reference

完整堆栈追踪：

Java.Interop.JniEnvironment.StaticMethods.CallStaticObjectMethod(JniObjectReference , JniMethodInfo , JniArgumentValue* )
Java.Interop.JniPeerMembers.JniStaticMethods.InvokeObjectMethod(String , JniArgumentValue* )
AndroidX.Core.View.ViewCompat.GetAccessibilityDelegate(View )
Microsoft.Maui.Controls.Platform.SemanticExtensions.AddOrRemoveControlsAccessibilityDelegate(View virtualView)
Microsoft.Maui.Controls.Platform.GesturePlatformManager.GestureCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
System.Collections.ObjectModel.ObservableCollection`1[[Microsoft.Maui.Controls.IGestureRecognizer, Microsoft.Maui.Controls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].OnCollectionChanged(NotifyCollectionChangedEventArgs )
System.Collections.ObjectModel.ObservableCollection`1[[Microsoft.Maui.Controls.IGestureRecognizer, Microsoft.Maui.Controls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].OnCollectionChanged(NotifyCollectionChangedAction , Object , Int32 )
System.Collections.ObjectModel.ObservableCollection`1[[Microsoft.Maui.Controls.IGestureRecognizer, Microsoft.Maui.Controls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].InsertItem(Int32 , IGestureRecognizer )
System.Collections.ObjectModel.Collection`1[[Microsoft.Maui.Controls.IGestureRecognizer, Microsoft.Maui.Controls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].Add(IGestureRecognizer item)
Microsoft.Maui.Controls.Label.SetupSpanGestureRecognizers(IEnumerable gestureRecognizers)
Microsoft.Maui.Controls.Label.SetupSpans(IEnumerable spans)
Microsoft.Maui.Controls.Label.<>c.<.cctor>b__124_0(BindableObject bindable, Object oldvalue, Object newvalue)
Microsoft.Maui.Controls.BindableObject.SetValueActual(BindableProperty property, BindablePropertyContext context, Object value, Boolean currentlyApplying, SetValueFlags attributes, SetterSpecificity specificity, Boolean silent)
Microsoft.Maui.Controls.BindableObject.SetValueCore(BindableProperty property, Object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes, SetterSpecificity specificity)
Microsoft.Maui.Controls.BindableObject.SetValue(BindableProperty property, Object value)
Microsoft.Maui.Controls.Label.set_FormattedText(FormattedString value)
MyApp.MyLabelView.OnTextPropertyChanged(BindableObject bindable, Object oldValue, Object newValue)
Microsoft.Maui.Controls.BindableObject.SetValueActual(BindableProperty property, BindablePropertyContext context, Object value, Boolean currentlyApplying, SetValueFlags attributes, SetterSpecificity specificity, Boolean silent)

测试更新 #

• 更新1：注释掉给Span添加TapGestureRecognizer的代码后，崩溃不再发生。
• 更新2：进一步测试发现，当Span包含手势并赋值给Label.FormattedText时，会在view.LabelControl.FormattedText = formattedText;处崩溃，无手势则正常显示。

有人遇到过类似问题吗？

内容的提问来源于stack exchange，提问作者Rajzer