Xamarin中不存在Project .Android（VS2015社区）
[英]Project .Android unavailable in Xamarin (VS2015 Community)
问题描述
I have a PCL Project in Xamarin (Visual Studio 2015), and when I open it today it shows me the Android project in unavailable state, the truth is not if this happened when installing something or an error of the physical test device, but I have been trying to solve it for days. 
我在Xamarin（Visual Studio 2015）中有一个PCL项目，当我今天打开它时，它向我显示Android项目处于不可用状态，事实并非不是在安装某些东西或物理测试设备错误时发生了这种情况，但是我几天来一直在努力解决它。
By right clicking on my android project, I get the option to install missing features 通过右键单击我的android项目，我可以选择安装缺少的功能
Clicking install opens the VS SETUP with the following default installations 单击安装将打开具有以下默认安装的VS SETUP
But it DOES NOT let me click on the "Update" button since nothing has been selected to install, what components should I install to solve this problem? 但这不允许我单击“更新”按钮，因为没有选择安装任何东西，应该安装哪些组件来解决此问题？
Should I follow the steps above to solve and recover my Android project? 我应该按照上述步骤解决和恢复我的Android项目吗？ or should I modify my file with extension .sln? 还是应该使用扩展名.sln修改文件？
My android.csproj: 我的android.csproj：
<PropertyGroup>
<ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them. For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
</PropertyGroup>
<Error Condition="!Exists('..\..\packages\Xamarin.Build.Download.0.4.5\build\Xamarin.Build.Download.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Build.Download.0.4.5\build\Xamarin.Build.Download.props'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Build.Download.0.4.5\build\Xamarin.Build.Download.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Build.Download.0.4.5\build\Xamarin.Build.Download.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Forms.2.5.1.444934\build\netstandard1.0\Xamarin.Forms.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Forms.2.5.1.444934\build\netstandard1.0\Xamarin.Forms.props'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Forms.2.5.1.444934\build\netstandard1.0\Xamarin.Forms.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Forms.2.5.1.444934\build\netstandard1.0\Xamarin.Forms.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.v7.Palette.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.Palette.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.v7.Palette.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.Palette.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.Transition.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Transition.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.Transition.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Transition.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.Media.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Media.Compat.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.Media.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Media.Compat.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.Fragment.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Fragment.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.Fragment.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Fragment.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.Core.Utils.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.Utils.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.Core.Utils.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.Utils.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.Core.UI.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.UI.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.Core.UI.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.UI.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Compat.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Compat.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.v4.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v4.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.v4.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v4.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.v7.CardView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.CardView.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.v7.CardView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.CardView.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.v7.RecyclerView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.RecyclerView.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.v7.RecyclerView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.RecyclerView.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Vector.Drawable.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Vector.Drawable.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.Animated.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Animated.Vector.Drawable.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.Animated.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Animated.Vector.Drawable.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.v7.AppCompat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.AppCompat.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.v7.AppCompat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.AppCompat.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.Design.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Design.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.Design.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Design.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.v7.MediaRouter.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.MediaRouter.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.v7.MediaRouter.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.MediaRouter.targets'))" />
<Error Condition="!Exists('..\..\packages\Xamarin.Android.Support.CustomTabs.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.CustomTabs.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Xamarin.Android.Support.CustomTabs.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.CustomTabs.targets'))" />
<Error Condition="!Exists('..\..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets'))" />
As you can see in my section PropertyGroup gives me the following error: 正如您在我的部分中看到的，PropertyGroup给我以下错误：
<PropertyGroup>
<ErrorText> This project references NuGet package (s) that are missing on this computer. Use NuGet Package Restore to download them. For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}. </ ErrorText>
</ PropertyGroup>
and in my ErrorList it shows me the following Warnings 并在我的ErrorList中向我显示以下警告
Is this related to not being able to visualize my Android project? 这与无法可视化我的Android项目有关吗？ How can I solve this headache? 我该如何解决这种头痛？ any help for me? 对我有帮助吗？ Thanks for your comments and help in advance 感谢您的评论和事先帮助
1 个解决方案
解决方案1
0 2018-06-19 09:36:37
You can try these: 您可以尝试以下方法：
1) Click Reload Project . 1）点击Reload Project 。
2) Delete your bin and obj folder, and restart your VS. 2）删除您的bin和obj文件夹，然后重新启动VS。
3) Try to repair VS. 3）尝试修复 VS。
4) Maybe it is the language problem. 4）也许是语言问题。
5) Maybe you need to reinstall Xamarin . 5）也许您需要重新安装Xamarin 。
6) Download VS 2017. 6）下载VS 2017。
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