MAUI Android应用模拟器运行正常，发布APK后启动崩溃求助

我使用Visual Studio Community Edition 2022开发Android应用，在内置Pixel模拟器或通过USB连接的真机上运行时一切正常，但生成签名发布APK并安装到同一设备或其他Android手机后，应用在闪屏后立即崩溃。

已尝试的解决方案 #

在.csproj文件中添加以下属性：

<PublishTrimmed>False</PublishTrimmed>
<AndroidLinkMode>None</AndroidLinkMode>
<AndroidDexTool>d8</AndroidDexTool>

<PropertyGroup>
 <AndroidPackageFormat>apk</AndroidPackageFormat>
</PropertyGroup>

<PropertyGroup>
 <AndroidEnableAssemblyCompression>false</AndroidEnableAssemblyCompression>
</PropertyGroup>

但问题仍未解决。

相关代码文件 #

MauiProgram.cs #

using CommunityToolkit.Maui;

namespace V2ROffline;

public static class MauiProgram
{
    public static MauiApp CreateMauiApp()
    {
        var builder = MauiApp.CreateBuilder();
        builder
            .UseMauiApp<App>()
            .UseMauiCommunityToolkit()
            .ConfigureFonts(fonts =>
            {
                fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
                fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
            });
        builder.Services.AddSingleton<MainPage>();
        builder.Services.AddTransient<StockTakeWithoutFile>();
        return builder.Build();
    }
}

App.xaml.cs #

namespace V2ROffline;

public partial class App : Application
{
    public App()
    {
        InitializeComponent();

        MainPage = new AppShell();
    }
}

App.xaml #

<?xml version = "1.0" encoding = "UTF-8" ?>
<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:V2ROffline"
             x:Class="V2ROffline.App">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
                <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

AppShell.xaml.cs #

namespace V2ROffline;

public partial class AppShell : Shell
{
    public AppShell()
    {
        InitializeComponent();
        Routing.RegisterRoute(nameof(StockTakeWithoutFile), typeof(StockTakeWithoutFile));
    }
}

AppShell.xaml #

<?xml version="1.0" encoding="UTF-8" ?>
<Shell
    x:Class="V2ROffline.AppShell"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:local="clr-namespace:V2ROffline"
    Shell.FlyoutBehavior="Disabled">

    <ShellContent
        Title="Home"
        ContentTemplate="{DataTemplate local:MainPage}"
        Route="MainPage" />

</Shell>

MainPage.xaml.cs #

namespace V2ROffline;
using System.Text.RegularExpressions;
using V2ROffline.lib;

public partial class MainPage : ContentPage
{
    int count = 0;

    public MainPage()
    {
        InitializeComponent();
/** Following code for checkWritePermission is not called
I believe app is crashing even before InitializeComponent() **/

        Task task = checkWritePermission();
        this.Title = Vars.TITLE + "-" + Vars.VERSION;
        TxtEmpCode.Focus();

    }
    private async Task checkWritePermission()
    {
        PermissionStatus status = await Permissions.RequestAsync<Permissions.StorageWrite>();
        status = await Permissions.RequestAsync<Permissions.StorageWrite>();
    }
    private void OnLoginClicked(object sender, EventArgs e)
    {
        string siteCode = TxtSiteCode.Text.Trim();
        string empCode = TxtEmpCode.Text.Trim();

        Regex regexSite = new Regex("^[a-zA-Z]{2}[0-9]{2}");
        Regex regexEmp = new Regex("^[a-zA-Z0-9]");

        if (!(empCode.Length >= 5 && empCode.Length <= 7 && regexEmp.IsMatch(empCode)))
        {
            DisplayAlert("Error", "Please enter valid Employee Code", "OK");
            TxtEmpCode.Focus();
            return;
        }

        if (!(siteCode.Length == 4 && regexSite.IsMatch(siteCode)))
        {
            DisplayAlert("Error", "Please enter valid Site Code", "OK");
            TxtSiteCode.Focus();
            return;
        }

        siteCode = siteCode.ToUpper();
        empCode = empCode.ToUpper();

        if (RbtnWithFile.IsChecked)
        {

        }
        else if (RbtnWithoutFile.IsChecked)
        {
            Task task = openStockTakeWithoutFile(empCode, siteCode);
        }
        else
        {
            DisplayAlert("Error", "Please select the mode of Stock Take", "OK");
            RbtnWithFile.Focus();
            return;
        }
    }

    async Task openStockTakeWithoutFile(string empCode, string siteCode)
    {
        var navigationParameter = new Dictionary<string, object>
        {
            { "EmpCode",  empCode},{ "SiteCode",  siteCode}
        };
        await Shell.Current.GoToAsync(nameof(StockTakeWithoutFile), navigationParameter);
    }

    private void OnExitClicked(object sender, EventArgs e)
    {
        App.Current.Quit();
    }
}

MainPage.xaml #

<?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:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
             x:Class="V2ROffline.MainPage">

    <ContentPage.Resources>
        <Style x:Key="InvalidEntryStyle" TargetType="Entry">
            <Setter Property="TextColor" Value="Red" />
        </Style>
        <Style x:Key="ValidEntryStyle" TargetType="Entry">
            <Setter Property="TextColor" Value="Green" />
        </Style>
    </ContentPage.Resources>

    <Grid Margin="50,50" x:Name="GridList" VerticalOptions="Center">
        <Grid.RowDefinitions>
            <RowDefinition Height="50" />
            <RowDefinition Height="50" />
            <RowDefinition Height="50" />
            <RowDefinition Height="50" />
            <RowDefinition Height="50" />
            <RowDefinition Height="50" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions Padding="10,0">
            <ColumnDefinition Width="120"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Label Grid.Row="0" Grid.Column="0" Text="Employee Code" 
               FontAttributes="Bold"
               HeightRequest="20"
               HorizontalOptions="Start" />

        <Border Stroke="#505050"
        StrokeThickness="1"
        Background="#FFFFFF"
        Padding="10,0"
        Grid.Row="0" Grid.Column="1"
        HeightRequest="40"
        WidthRequest="170"
        HorizontalOptions="Start">
            <Border.StrokeShape>
                <RoundRectangle CornerRadius="5,5,5,5" />
            </Border.StrokeShape>
            <Entry x:Name="TxtEmpCode" 
               Placeholder="Enter employee code"
               TextTransform="Uppercase"
               MaxLength="7"
               >
                <Entry.Behaviors>
                    <toolkit:TextValidationBehavior 
                InvalidStyle="{StaticResource InvalidEntryStyle}"
                ValidStyle="{StaticResource ValidEntryStyle}"
                Flags="ValidateOnValueChanged"
                MinimumLength="5"
                MaximumLength="7" />
                </Entry.Behaviors>
            </Entry>
        </Border>
        <Label Grid.Row="1" Grid.Column="0" Text="Site Code"
               FontAttributes="Bold"
               HeightRequest="20"
               HorizontalOptions="Start" />
        <Border Stroke="#505050"
        StrokeThickness="1"
        Background="#FFFFFF"
        Padding="10,0"
        Grid.Row="1" Grid.Column="1" 
        HeightRequest="40"
        WidthRequest="170"
        HorizontalOptions="Start">
            <Border.StrokeShape>
                <RoundRectangle CornerRadius="5,5,5,5" />
            </Border.StrokeShape>
            <Entry x:Name="TxtSiteCode" 
               Placeholder="Enter site code here"
               TextTransform="Uppercase"
               MaxLength="4"
               >
                <Entry.Behaviors>
                    <toolkit:TextValidationBehavior 
                InvalidStyle="{StaticResource InvalidEntryStyle}"
                ValidStyle="{StaticResource ValidEntryStyle}"
                Flags="ValidateOnValueChanged"
                MinimumLength="4"
                MaximumLength="4" />
                </Entry.Behaviors>
            </Entry>
        </Border>
        <RadioButton x:Name="RbtnWithFile" RadioButtonGroup.GroupName="StockTake" HeightRequest="30" Content="Stock take with file" Grid.Row="2" Grid.ColumnSpan="2" />
        <RadioButton x:Name="RbtnWithoutFile" RadioButtonGroup.GroupName="StockTake" HeightRequest="30" Content="Stock take without file" Grid.Row="3" Grid.ColumnSpan="2" />
        <Button Grid.Row="4" Grid.Column="0"
            x:Name="BtnExit"
            Margin="0,10,0,0"
            Text="Exit"
            WidthRequest="120"
            Clicked="OnExitClicked"
            HorizontalOptions="Center" />
        <Button Grid.Row="4" Grid.Column="1"
            x:Name="BtnLogin"
            Margin="0,10,0,0"
            Text="Login"
            WidthRequest="120"
            Clicked="OnLoginClicked"
            HorizontalOptions="Center" />
    </Grid>

</ContentPage>

问题排查怀疑 #

我怀疑应用在InitializeComponent()执行前就已经崩溃，因为checkWritePermission()代码完全没有被调用。

内容的提问来源于stack exchange，提问作者maddy23285