我创建了一个 NetMaui 应用程序，在页面中我有一个集合视图 当我在 Windows 中执行应用程序时，我没有问题，但在 Android 中，集合视图没有显示
我在调试和发布时遇到这个问题 在此输入图片描述
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:converters="clr-namespace:Commessa2005.Daht.Produzione.Maui.Converters"
x:Class="Commessa2005.Daht.Produzione.Maui.Pages.P41_DichiaraProduzione"
xmlns:controls="clr-namespace:Commessa2005.Daht.Produzione.Maui.Controls"
xmlns:model="clr-namespace:Commessa2005.Daht.Shared.Models"
Title=""
NavigationPage.HasNavigationBar="false"
Shell.NavBarIsVisible="true"
xmlns:viewModel="clr-namespace:Commessa2005.Daht.Produzione.Maui.ViewModels"
x:DataType="viewModel:ConsProduzioneViewModel"
xmlns:android="clr-namespace:Microsoft.Maui.Controls.PlatformConfiguration.AndroidSpecific;assembly=Microsoft.Maui.Controls"
>
<!-- xmlns:model="clr-namespace:Commessa2005.Daht.Shared.Models;assembly=Commessa2005.Daht.Shared" -->
<!-- xmlns:model="clr-namespace:Commessa2005.Daht.Shared.Models" -->
<ContentPage.Resources>
<converters:InvertedBoolConverter x:Key="InvertedBoolConverter" />
</ContentPage.Resources>
<VerticalStackLayout Margin="0"
Spacing="3"
>
<controls:TitleBar />
<Label
Text="DICHIARA PRODUZIONE"
Style="{DynamicResource LargeLabel}"
VerticalOptions="Center"
HorizontalOptions="Center" />
<Label Text="Quantità prodotta"
Style="{DynamicResource MediumLabel}"
VerticalOptions="Center"
HorizontalOptions="Center" />
<StackLayout Orientation="Horizontal" IsEnabled="{Binding IsNotBusy}">
<Frame ZIndex="1" HasShadow="True"
BorderColor="{AppThemeBinding Light={DynamicResource LightEntryBackground}, Dark={DynamicResource DarkEntryBackground}}"
HeightRequest="56" WidthRequest="56" CornerRadius="28">
<Image Source="tastierino_48.png"
HeightRequest="30"
WidthRequest="30"
HorizontalOptions="Center"
VerticalOptions="Center"
Margin="-8,-8,0,0"/>
</Frame>
<Frame HeightRequest="45" Margin="-20,0,0,0" Padding="0" HasShadow="True" BorderColor="White" HorizontalOptions="FillAndExpand">
<Entry x:Name="QtaProdotta"
Style="{DynamicResource BaseEntry}"
Placeholder="Inserire la nuova quantita prodotta"
HorizontalOptions="Center"
Keyboard="Numeric"
Text="{Binding QtaProdotta}"
android:Entry.ImeOptions="Next"
Completed="OnQtaProdottaInserita"
/>
</Frame>
</StackLayout>
<StackLayout Orientation="Horizontal" IsEnabled="{Binding IsNotBusy}">
<Frame ZIndex="2" HasShadow="True"
BorderColor="{AppThemeBinding Light={DynamicResource LightEntryBackground}, Dark={DynamicResource DarkEntryBackground}}"
HeightRequest="56" WidthRequest="56" CornerRadius="28">
<Image Source="tastierino_48.png"
HeightRequest="30"
WidthRequest="30"
HorizontalOptions="Center"
VerticalOptions="Center"
Margin="-8,-8,0,0"/>
</Frame>
<Frame HeightRequest="45" Margin="-20,0,0,0" Padding="0" HasShadow="True" BorderColor="White" HorizontalOptions="FillAndExpand">
<Entry x:Name="Note"
Style="{DynamicResource BaseEntry}"
Placeholder="Annotazioni"
HorizontalOptions="Center"
Text="{Binding Annotazioni}"
ReturnType="Go"
/>
</Frame>
</StackLayout>
<Grid ColumnDefinitions="*,*">
<Switch x:Name="StampaEtich"
HorizontalOptions="Start"
Grid.Column="1"
IsToggled="{Binding StampaEtichetta}"
/>
<Label Text="Stampa etichette"
HorizontalOptions="Center"
Style="{StaticResource MediumLabel}"
Grid.Column="0"
/>
</Grid>
<Grid ColumnDefinitions="*,*">
<Button
x:Name="Annulla"
Text="Annulla"
Grid.Column="0"
FontSize="24"
Clicked="OnAnnullaClicked"
VerticalOptions="CenterAndExpand"
HorizontalOptions="Fill"
HeightRequest="50"
/>
<!-- Style="{StaticResource ButtonOutline}"-->
<Button
x:Name="Conferma"
Text="Conferma"
Grid.Column="1"
FontSize="24"
Clicked="OnDichiaraProdClicked"
VerticalOptions="CenterAndExpand"
HorizontalOptions="Fill"
HeightRequest="50"
/>
</Grid>
<ActivityIndicator x:Name="Attesa" IsVisible="{Binding IsBusy}"
IsRunning="{Binding IsBusy}" Color="Red"
WidthRequest="20"
HeightRequest="20"/>
<ScrollView VerticalScrollBarVisibility="Always" VerticalOptions="Start">
<Grid ColumnDefinitions="*"
ColumnSpacing="0"
RowDefinitions="*">
<Grid Grid.Row="0"
IsVisible="{Binding IsErrorPresent,Converter={StaticResource InvertedBoolConverter}}"
ColumnDefinitions="*"
ColumnSpacing="5"
RowDefinitions="*">
<RefreshView x:Name="RefreshView"
Command="{Binding GetMaterialiCommand}"
IsRefreshing="{Binding IsRefreshing}"
>
<!-- TODO: Senza HeightRequest non scrolla BUG MAUI-->
<!-- BackgroundColor="Transparent" -->
<CollectionView x:Name="ListaMateriali"
BackgroundColor="Yellow"
ItemsSource="{Binding Materiali}"
SelectionMode="Single"
HeightRequest="430"
>
<CollectionView.EmptyView>
<StackLayout VerticalOptions="Center"
HorizontalOptions="Center"
WidthRequest="200"
HeightRequest="200">
<Image Source="nodata.png"
HorizontalOptions="CenterAndExpand"
VerticalOptions="CenterAndExpand"
Aspect="AspectFill" />
</StackLayout>
</CollectionView.EmptyView>
<CollectionView.ItemTemplate>
<DataTemplate x:DataType="model:MaterialeUtilizzatoDetails">
<Grid Padding="5" RowDefinitions="140">
<Frame
Padding="0"
Style="{StaticResource CardView}">
<!--
<Frame.GestureRecognizers>
<TapGestureRecognizer
Command="{Binding Source={RelativeSource AncestorType={x:Type viewModel:ConsProduzioneViewModel}}, Path=XXX}"
CommandParameter="{Binding .}"/>
</Frame.GestureRecognizers>
-->
<Grid Padding="0"
ColumnDefinitions="125,*">
<VerticalStackLayout Grid.Column="0"
Padding="10"
VerticalOptions="Center">
<Image Aspect="AspectFill"
Source="nodata.png"
WidthRequest="100"
HeightRequest="100" />
<Label Text="{Binding idProdotto,StringFormat='Cod.Prodotto {0}'}"
Style="{StaticResource MicroLabel}"
MaxLines="1"/>
</VerticalStackLayout>
<VerticalStackLayout Grid.Column="1"
Padding="10"
VerticalOptions="Center">
<Label Text="{Binding codarticolointerno}"
Style="{StaticResource SmallLabel}"
MaxLines="1"/>
<Label Text="{Binding prodotto}"
Style="{StaticResource SmallLabel}"
MaxLines="2"/>
<Grid x:Name="Produzione"
Padding="0"
RowDefinitions="*,*"
ColumnDefinitions="100,*,50"
HorizontalOptions="FillAndExpand">
<Label Grid.Column="0"
Grid.Row="0"
HorizontalTextAlignment="Start"
Text="{Binding descrTipoMatUsato}"
Style="{StaticResource SmallLabel}"
TextColor="{AppThemeBinding Light={StaticResource LightLabelEvidenceText}, Dark={StaticResource DarkLabelEvidenceText}}"
/>
<Entry x:Name="IDCaricoMag"
Grid.Column="1"
Grid.Row="0"
Keyboard="Numeric"
Style="{DynamicResource BaseEntry}"
Placeholder="IDCarico Mag."
Text="{Binding idCaricoMag}"
IsVisible="{Binding isDaProduzione, Converter={StaticResource InvertedBoolConverter}}"
IsEnabled="{Binding isMagazzinoPers, Converter={StaticResource InvertedBoolConverter}}"
android:Entry.ImeOptions="Next"
Completed="OnIDCaricoMagInserito"
/>
<Entry x:Name="LottoMat_Utilizz"
Grid.Column="1"
Grid.Row="0"
Keyboard="Numeric"
Style="{DynamicResource BaseEntry}"
Placeholder="LottoMat. Prod."
Text="{Binding lottoMat_Utilizzo}"
IsVisible="{Binding isDaProduzione}"
android:Entry.ImeOptions="Next"
Completed="OnLottoMat_UtilizzInserito"
/>
<Label Grid.Column="0"
Grid.Row="1"
Text="{Binding um}"
HorizontalTextAlignment="Start"
Style="{StaticResource SmallLabel}"
IsVisible="{Binding isMagazzinoPers, Converter={StaticResource InvertedBoolConverter}}"/>
<Entry x:Name="Qta"
Grid.Row="1"
Grid.Column="1"
Keyboard="Numeric"
Style="{DynamicResource BaseEntry}"
Placeholder="{Binding qtaUtilizzataCalcolataAuto}"
Text="{Binding qtaUtilizzata}"
IsVisible="{Binding isMagazzinoPers, Converter={StaticResource InvertedBoolConverter}}"
android:Entry.ImeOptions="Next"
Completed="OnQtaInserita"
/>
<Image Source="qrcode.png"
Grid.Column="2"
Grid.Row="0"
Grid.RowSpan="2"
HeightRequest="30"
WidthRequest="30"
HorizontalOptions="Center"
VerticalOptions="Center"
Margin="0,0,0,0"
IsVisible="{Binding isMagazzinoPers, Converter={StaticResource InvertedBoolConverter}}"
>
<Image.GestureRecognizers>
<TapGestureRecognizer
Command="{Binding Source={RelativeSource AncestorType={x:Type viewModel:ConsProduzioneViewModel}}, Path=ReadBarcodeMaterialeUtilizzatoCommand}"
CommandParameter="{Binding .}"
Tapped="OnBarcodeTapped"
NumberOfTapsRequired="1"
/>
</Image.GestureRecognizers>
</Image>
</Grid>
</VerticalStackLayout>
</Grid>
</Frame>
</Grid>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
</RefreshView>
</Grid>
<Label IsVisible="{Binding IsErrorPresent}"
Text="{Binding Error}"
Style="{DynamicResource ErrorLabel}"
Grid.Row="1"
HorizontalOptions="Center">
<Label.GestureRecognizers>
<TapGestureRecognizer
Command="{Binding Source={RelativeSource AncestorType={x:Type viewModel:ConsProduzioneViewModel}}, Path=ResetErrorCommand}"
CommandParameter="{Binding .}"/>
</Label.GestureRecognizers>
</Label>
</Grid>
</ScrollView>
</VerticalStackLayout>
</ContentPage>