那些遇到过的问题

您的项目没有引用“MonoAndroid,Version=v9.0”

axa*_*axa 6 visual-studio xamarin.android

由于 google 需要所有新的以及更新的目标 api 级别 28。

我有一个在 PC 上使用 Visual Studio 的 xamarin android 项目

这样做我无法克服错误：

Your project does not reference "MonoAndroid,Version=v9.0" framework. Add a reference to "MonoAndroid,Version=v9.0" in the "TargetFrameworks" property of your project file and then re-run NuGet restore.
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我的项目目前没有任何 nuget 包，所以我完全不知道他们在这里要求什么。

我当然试图在项目属性中针对 v9。这当然会按预期更新项目和清单。

我早就安装了 28 sdk，但一定要更新我的 sdk，不仅使用 MS 存储库，还使用谷歌存储库上发布的最新版本...

我还确定使用了正确的 Mono.Android.dll 引用并存在：\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v9.0\Mono.Android.dll"

最后，我升级到 Visual Studio 2019 认为这可以解决我搞砸的任何事情，但它没有。

然后我继续尝试针对 android Q 也不起作用。所以我停留在 v8.1 或更低版本。

我已经在互联网上搜索了答案。我尝试过的建议是确保项目没有使用最新平台标签，并以管理员身份运行

任何建议表示赞赏。

根据评论更新：

重复我上面说的。但为了证明，

我当然试图在项目属性中针对 v9。这当然会按预期更新项目和清单。

  • 这是说明目标版本的项目文件：

在此处输入图片说明

我早就安装了 28 sdk，但一定要更新我的 sdk，不仅使用 MS 存储库，还使用谷歌存储库上发布的最新版本...

  • 这是指示目标内容的清单：

    <uses-sdk android:minSdkVersion="24" android:targetSdkVersion="28" />

在属性中查看的目标版本 在此处输入图片说明

和编译版本集 编译版本

以及sdk manager的当前内容 SDK管理器

虽然我也尝试使用谷歌存储库和 android Q 在此处输入图片说明

这是项目文件内容：

（我应该注意与上述相反，我添加了一个 nuget 包，看看它是否有帮助）

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProductVersion>8.0.30703</ProductVersion>
    <SchemaVersion>2.0</SchemaVersion>
    <ProjectGuid>{C79A7EE8-2CFC-4158-9BE0-D540A39E2823}</ProjectGuid>
    <ProjectTypeGuids>{EFBA0AD7-5A72-4C68-AF49-83D382785DCF};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
    <TemplateGuid>{122416d6-6b49-4ee2-a1e8-b825f31c79fe}</TemplateGuid>
    <OutputType>Library</OutputType>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <RootNamespace>MotoApp</RootNamespace>
    <AssemblyName>MotoApp</AssemblyName>
    <FileAlignment>512</FileAlignment>
    <AndroidApplication>True</AndroidApplication>
    <AndroidResgenFile>Resources\Resource.designer.cs</AndroidResgenFile>
    <AndroidResgenClass>Resource</AndroidResgenClass>
    <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
    <AndroidUseLatestPlatformSdk>false</AndroidUseLatestPlatformSdk>
    <TargetFrameworkVersion>v9.0</TargetFrameworkVersion>
    <AndroidManifest>Properties\AndroidManifest.xml</AndroidManifest>
    <MonoAndroidResourcePrefix>Resources</MonoAndroidResourcePrefix>
    <MonoAndroidAssetsPrefix>Assets</MonoAndroidAssetsPrefix>
    <AndroidHttpClientHandlerType>Xamarin.Android.Net.AndroidClientHandler</AndroidHttpClientHandlerType>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <DebugSymbols>True</DebugSymbols>
    <DebugType>portable</DebugType>
    <Optimize>False</Optimize>
    <OutputPath>bin\Debug\</OutputPath>
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
    <AndroidUseSharedRuntime>True</AndroidUseSharedRuntime>
    <AndroidLinkMode>None</AndroidLinkMode>
    <EmbedAssembliesIntoApk>False</EmbedAssembliesIntoApk>
    <AotAssemblies>false</AotAssemblies>
    <EnableLLVM>false</EnableLLVM>
    <BundleAssemblies>false</BundleAssemblies>
    <AndroidSupportedAbis>armeabi-v7a;x86;arm64-v8a</AndroidSupportedAbis>
    <LangVersion>latest</LangVersion>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
    <DebugSymbols>True</DebugSymbols>
    <DebugType>pdbonly</DebugType>
    <Optimize>True</Optimize>
    <OutputPath>bin\Release\</OutputPath>
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
    <AndroidManagedSymbols>true</AndroidManagedSymbols>
    <AndroidUseSharedRuntime>False</AndroidUseSharedRuntime>
    <AndroidLinkMode>SdkOnly</AndroidLinkMode>
    <EmbedAssembliesIntoApk>True</EmbedAssembliesIntoApk>
    <AotAssemblies>false</AotAssemblies>
    <EnableLLVM>false</EnableLLVM>
    <BundleAssemblies>false</BundleAssemblies>
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="Newtonsoft.Json, Version=12.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
      <HintPath>..\packages\Newtonsoft.Json.12.0.2\lib\netstandard2.0\Newtonsoft.Json.dll</HintPath>
    </Reference>
    <Reference Include="System" />
    <Reference Include="System.Core" />
    <Reference Include="Mono.Android" />
  </ItemGroup>
  <ItemGroup>
    <Compile Include="App\Activities\Interaction\Scaffolding\CharacteristicMenuItem.cs" />
    <Compile Include="App\Activities\Interaction\Scaffolding\DeviceMenuItem.cs" />
    <Compile Include="App\Activities\Interaction\Scaffolding\IgnitionGraceItem.cs" />
    <Compile Include="App\Activities\Interaction\Scaffolding\IgnitionModeItem.cs" />
    <Compile Include="App\Activities\Interaction\Scaffolding\IgnitionStateItem.cs" />
    <Compile Include="App\Activities\Interaction\Scaffolding\IgnitionComboItem.cs" />
    <Compile Include="App\Activities\Interaction\Scaffolding\SecurityPinItem.cs" />
    <Compile Include="App\Activities\Interaction\Ui\Ignition\IgnitionGraceActivity.cs" />
    <Compile Include="App\Activities\Interaction\Ui\Ignition\IgnitionModeActivity.cs" />
    <Compile Include="App\Activities\Interaction\Ui\Ignition\IgnitionComboActivity.cs" />
    <Compile Include="App\Activities\Interaction\Ui\Security\SecurityPinActivity.cs" />
    <Compile Include="App\Activities\Interaction\Ui\Security\SecurityActivity.cs" />
    <Compile Include="App\Activities\Interaction\Ui\Devices\DeviceNameActivity.cs" />
    <Compile Include="App\Activities\Interaction\Scaffolding\ArrayAdapters.cs" />
    <Compile Include="App\Activities\Interaction\Ui\Devices\DevicesActivity.cs" />
    <Compile Include="App\Activities\Interaction\Ui\FunctionsActivity.cs" />
    <Compile Include="App\Activities\Interaction\Ui\Ignition\IgnitionActivity.cs" />
    <Compile Include="App\Activities\Interaction\Ui\MainActivity.cs" />
    <Compile Include="App\Activities\Interaction\Scaffolding\BaseMenuItem.cs" />
    <Compile Include="Resources\Resource.designer.cs" />
    <Compile Include="Properties\AssemblyInfo.cs" />
    <Compile Include="App\Common.cs" />
  </ItemGroup>
  <ItemGroup>
    <None Include="packages.config" />
    <None Include="Resources\AboutResources.txt" />
    <None Include="Properties\AndroidManifest.xml" />
    <None Include="Assets\AboutAssets.txt" />
  </ItemGroup>
  <ItemGroup>
    <AndroidResource Include="Resources\layout\MainLayout.axml">
      <SubType>Designer</SubType>
    </AndroidResource>
    <AndroidResource Include="Resources\values\colors.xml" />
    <AndroidResource Include="Resources\values\ic_launcher_background.xml" />
    <AndroidResource Include="Resources\values\strings.xml" />
    <AndroidResource Include="Resources\mipmap-anydpi-v26\ic_launcher.xml" />
    <AndroidResource Include="Resources\mipmap-anydpi-v26\ic_launcher_round.xml" />
    <AndroidResource Include="Resources\mipmap-hdpi\ic_launcher.png" />
    <AndroidResource Include="Resources\mipmap-hdpi\ic_launcher_foreground.png" />
    <AndroidResource Include="Resources\mipmap-hdpi\ic_launcher_round.png" />
    <AndroidResource Include="Resources\mipmap-mdpi\ic_launcher.png" />
    <AndroidResource Include="Resources\mipmap-mdpi\ic_launcher_foreground.png" />
    <AndroidResource Include="Resources\mipmap-mdpi\ic_launcher_round.png" />
    <AndroidResource Include="Resources\mipmap-xhdpi\ic_launcher.png" />
    <AndroidResource Include="Resources\mipmap-xhdpi\ic_launcher_foreground.png" />
    <AndroidResource Include="Resources\mipmap-xhdpi\ic_launcher_round.png" />
    <AndroidResource Include="Resources\mipmap-xxhdpi\ic_launcher.png" />
    <AndroidResource Include="Resources\mipmap-xxhdpi\ic_launcher_foreground.png" />
    <AndroidResource Include="Resources\mipmap-xxhdpi\ic_launcher_round.png" />
    <AndroidResource Include="Resources\mipmap-xxxhdpi\ic_launcher.png" />
    <AndroidResource Include="Resources\mipmap-xxxhdpi\ic_launcher_foreground.png" />
    <AndroidResource Include="Resources\mipmap-xxxhdpi\ic_launcher_round.png" />
  </ItemGroup>
  <ItemGroup>
    <AndroidResource Include="Resources\layout\ListLayout.axml">
      <SubType>Designer</SubType>
    </AndroidResource>
  </ItemGroup>
  <ItemGroup>
    <AndroidResource Include="Resources\layout\ComboLayout.axml">
      <SubType>Designer</SubType>
    </AndroidResource>
  </ItemGroup>
  <ItemGroup>
    <AndroidResource Include="Resources\layout\TextEditLayout.axml">
      <SubType>Designer</SubType>
    </AndroidResource>
  </ItemGroup>
  <ItemGroup>
    <AndroidResource Include="Resources\layout\TimeLayout.axml">
      <SubType>Designer</SubType>
    </AndroidResource>
  </ItemGroup>
  <ItemGroup>
    <AndroidResource Include="Resources\layout\IgnitionLayout.axml">
      <SubType>Designer</SubType>
    </AndroidResource>
  </ItemGroup>
  <ItemGroup>
    <AndroidResource Include="Resources\layout\PinLayout.axml">
      <SubType>Designer</SubType>
    </AndroidResource>
  </ItemGroup>
  <ItemGroup>
    <ProjectReference Include="..\MotoBle\MotoBle.csproj">
      <Project>{61a6eb26-f9fc-4c26-8842-b25f6aa2cae1}</Project>
      <Name>MotoBle</Name>
    </ProjectReference>
  </ItemGroup>
  <ItemGroup>
    <AndroidResource Include="Resources\drawable\moto32x32.png" />
  </ItemGroup>
  <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
  <!-- To modify your build process, add your task inside one of the targets below and uncomment it.
    Other similar extension points exist, see Microsoft.Common.targets.
    <Target Name="BeforeBuild">
    </Target>
    <Target Name="AfterBuild">
    </Target>
  -->
</Project>
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这是主应用程序项目引用的“MotoBle”库的项目文件：

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProductVersion>8.0.30703</ProductVersion>
    <SchemaVersion>2.0</SchemaVersion>
    <ProjectGuid>{61A6EB26-F9FC-4C26-8842-B25F6AA2CAE1}</ProjectGuid>
    <ProjectTypeGuids>{EFBA0AD7-5A72-4C68-AF49-83D382785DCF};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
    <TemplateGuid>{9ef11e43-1701-4396-8835-8392d57abb70}</TemplateGuid>
    <OutputType>Library</OutputType>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <RootNamespace>MotoBle</RootNamespace>
    <AssemblyName>MotoBle</AssemblyName>
    <FileAlignment>512</FileAlignment>
    <AndroidResgenFile>Resources\Resource.designer.cs</AndroidResgenFile>
    <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
    <TargetFrameworkVersion>v9.0</TargetFrameworkVersion>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <DebugSymbols>true</DebugSymbols>
    <DebugType>portable</DebugType>
    <Optimize>false</Optimize>
    <OutputPath>bin\Debug\</OutputPath>
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
    <LangVersion>7.3</LangVersion>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
    <DebugType>pdbonly</DebugType>
    <Optimize>true</Optimize>
    <OutputPath>bin\Release\</OutputPath>
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="Mono.Android">
      <HintPath>..\..\..\..\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v9.0\Mono.Android.dll</HintPath>
    </Reference>
    <Reference Include="mscorlib" />
    <Reference Include="System" />
    <Reference Include="System.Core" />
  </ItemGroup>
  <ItemGroup>
    <Compile Include="AdvertisementService.cs" />
    <Compile Include="BleDevice.cs" />
    <Compile Include="Constants.cs" />
    <Compile Include="Platform.cs" />
    <Compile Include="Spec\Descriptors\CharacteristicPresentationFormat.cs" />
    <Compile Include="Spec\Descriptors\CharacteristicUserDescription.cs" />
    <Compile Include="Spec\Descriptors\ClientCharacteristicConfiguration.cs" />
    <Compile Include="Spec\Descriptors\DescriptorBase.cs" />
    <Compile Include="Spec\Utilities.cs" />
    <Compile Include="CommandService.cs" />
    <Compile Include="GattCallback.cs" />
    <Compile Include="GattCommand.cs" />
    <Compile Include="Resources\Resource.designer.cs" />
    <Compile Include="Properties\AssemblyInfo.cs" />
  </ItemGroup>
  <ItemGroup>
    <None Include="Resources\AboutResources.txt" />
  </ItemGroup>
  <ItemGroup>
    <AndroidResource Include="Resources\values\strings.xml" />
  </ItemGroup>
  <ItemGroup>
    <Folder Include="Resources\drawable\" />
  </ItemGroup>
  <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
       Other similar extension points exist, see Microsoft.Common.targets.
  <Target Name="BeforeBuild">
  </Target>
  <Target Name="AfterBuild">
  </Target>
  -->
</Project>
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我虚心请求任何可能有帮助的信息。

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