问题描述
我有一个使用Xamarin.Forms构建的移动应用
将Visual Studio从 16.4.4 更新到 16.7.0
之后这些错误出现了
Assembly 'Xamarin.GooglePlayServices.Maps' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v7.CardView' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.GooglePlayServices.Base' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v7.MediaRouter' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.Vector.Drawable' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.Design' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.GooglePlayServices.Gcm' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v7.AppCompat' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v7.RecyclerView' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.GooglePlayServices.Basement' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.Animated.Vector.Drawable' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v7.AppCompat' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.GooglePlayServices.Maps' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v4' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v7.CardView' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v4' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.GooglePlayServices.Gcm' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v7.RecyclerView' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.Design' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v7.MediaRouter' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.Animated.Vector.Drawable' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.Vector.Drawable' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.GooglePlayServices.Base' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v7.MediaRouter' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.Android.Support.v4' is using '[assembly: Android.IncludeAndroidResourcesFromAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
Assembly 'Xamarin.GooglePlayServices.Basement' is using '[assembly: Java.Interop.JavaLibraryReferenceAttribute]',which is no longer supported. Use a newer version of this NuGet package or notify the library author. MyApp.Android
我尝试了什么？
1-我试图删除 bin 和 obj 文件夹，以强制项目重建所有内容，但错误仍然出现
2-我试图降级到 16.4.4 ，并且错误消失了，但是我不想通过以下方式修复它之所以这样，是因为我想使用此new feature in 16.7.0
创建一个新的其他应用程序因此，是否有办法在不降级到旧版本的情况下摆脱这些错误？
注释：
Xamarin.Forms的版本为2.3
解决方法
Xamarin.Forms的版本为2.3
由于Visual Studio 2019不支持v2.3，因此您需要更新Xamarin.Forms的较新版本; Xamarin.Forms v2.3是released in 2016。
我建议使用最新版本的Xamarin.Forms。
,android版本10不支持Xamarin.Android.Support.v7 如果将目标框架版本更改为Android 9，则可以在设备中进行调试。
按照步骤
转到Android.project > properties > target framework
您能否尝试将android Target Framework（从项目属性或.csproj）升级到最新版本，如下所示：
在删除bin和obj文件夹后重建项目。应该可以。