小编Man*_*nnu的帖子

我的目标单声道android版本是8.0，我在构建droid时正在API级别26上构建我的应用程序，我收到大约500个与android和IOS中的nuget软件包相关的警告....类似这样的东西...

/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1476,2): warning XA0106: Skipping BMS.Droid.Resource.Animation.design_fab_in. Please check that your Nuget Package versions are compatible.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1476,2): warning XA0106: Skipping BMS.Droid.Resource.Animation.design_fab_out. Please check that your Nuget Package versions are compatible.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1476,2): warning XA0106: Skipping BMS.Droid.Resource.Attribute.MediaRouteControllerWindowBackground. Please check that your Nuget Package versions are compatible.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1476,2): warning XA0106: Skipping BMS.Droid.Resource.Attribute.mediaRouteBluetoothIconDrawable. Please check that your Nuget Package versions are compatible.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1476,2): warning XA0106: Skipping BMS.Droid.Resource.Attribute.mediaRouteCastDrawable. Please check that your Nuget Package versions are compatible.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1476,2): warning XA0106: Skipping BMS.Droid.Resource.Attribute.mediaRouteChooserPrimaryTextStyle. Please check that your …

我想更改所选项目的背景颜色。我已经尝试过以下解决方案，但它不起作用。

<CollectionView x:Name="FlexCategoryType"
                Margin="0"
                HorizontalOptions="FillAndExpand"
                ItemsSource="{Binding ItemsCategory}"
                SelectedItem="{Binding SelectedCategory, Mode=TwoWay}"
                SelectionChanged="FlexCategoryType_SelectionChanged"
                SelectionMode="Single">
    <CollectionView.ItemTemplate>
        <DataTemplate>
            <StackLayout>
                <Label Text="{Binding Name}" />
                <VisualStateManager.VisualStateGroups>
                    <VisualStateGroup Name="CommonStates">
                        <VisualState Name="Normal" />
                        <VisualState Name="Selected">
                            <VisualState.Setters>
                                <Setter Property="BackgroundColor"
                                        Value="Yellow" />
                            </VisualState.Setters>
                        </VisualState>
                    </VisualStateGroup>
                </VisualStateManager.VisualStateGroups>
            </StackLayout>
        </DataTemplate>
    </CollectionView.ItemTemplate>
</CollectionView>

CollectionView SelectedItem 在 Xamarin Forms 中未突出显示