Java 类型 `javax.inject.Inject` 由多个托管类型生成。请更改 [注册] 属性

Posted 2023-03-25

【中文标题】Java 类型 `javax.inject.Inject` 由多个托管类型生成。请更改 [注册] 属性

【英文标题】：The Java type `javax.inject.Inject` is generated by more than one managed type. Please change the [Register] attribute

【发布时间】：2022-01-22 14:30:50

【问题描述】：

已将 Xamarin.android 项目迁移到 AndroidX，并且必须更新一些包。现在我无法构建我的项目并收到以下错误消息：

`javax.inject.Named` generated by: JavaX.Inject.INamed, Xamarin.JavaX.Inject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null             
`javax.inject.Scope` generated by: Javax.Inject.IScope, Scanbot.Xamarin.SDK.Dependencies, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null             
`javax.inject.Qualifier` generated by: JavaX.Inject.IQualifier, Xamarin.JavaX.Inject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null             
The Java type `javax.inject.Inject` is generated by more than one managed type. Please change the [Register] attribute so that the same Java type is not emitted.               
`javax.inject.Provider` generated by: JavaX.Inject.IProvider, Xamarin.JavaX.Inject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null               
`javax.inject.Inject` generated by: JavaX.Inject.IInject, Xamarin.JavaX.Inject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null               
`javax.inject.Qualifier` generated by: Javax.Inject.IQualifier, Scanbot.Xamarin.SDK.Dependencies, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null             
The Java type `javax.inject.Provider` is generated by more than one managed type. Please change the [Register] attribute so that the same Java type is not emitted.             
`javax.inject.Scope` generated by: JavaX.Inject.IScope, Xamarin.JavaX.Inject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null             
`javax.inject.Named` generated by: Javax.Inject.INamed, Scanbot.Xamarin.SDK.Dependencies, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null             
The Java type `javax.inject.Scope` is generated by more than one managed type. Please change the [Register] attribute so that the same Java type is not emitted.                
`javax.inject.Provider` generated by: Javax.Inject.IProvider, Scanbot.Xamarin.SDK.Dependencies, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null               
`javax.inject.Singleton` generated by: JavaX.Inject.ISingleton, Xamarin.JavaX.Inject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null             
`javax.inject.Inject` generated by: Javax.Inject.IInject, Scanbot.Xamarin.SDK.Dependencies, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null               
The Java type `javax.inject.Named` is generated by more than one managed type. Please change the [Register] attribute so that the same Java type is not emitted.                
The Java type `javax.inject.Qualifier` is generated by more than one managed type. Please change the [Register] attribute so that the same Java type is not emitted.                
`javax.inject.Singleton` generated by: Javax.Inject.ISingleton, Scanbot.Xamarin.SDK.Dependencies, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null             
The Java type `javax.inject.Singleton` is generated by more than one managed type. Please change the [Register] attribute so that the same Java type is not emitted.                

请告知如何修复它或如何更改 [Register] 属性以及需要在哪里完成。我无法删除这些包，其他包依赖于它们。

【问题讨论】：

可能无济于事，但是在进行这样的重大更改后，退出 VS，删除解决方案中的所有 bin 和 obj 文件夹。

@ToolmakerSteve 试过了，没有帮助。

项目中的nuget包之间存在一些冲突。在每个错误行上查看“生成者”之后的包名称对。也许必须删除一些包，需要一个不同的包才能与 AndroidX 一起使用。不幸的是，确切的修复需要知道哪些包冲突。在新文件夹中创建一个新的空项目。开始添加您需要的 nuget。一次一个。在添加每个之后构建。直到你再次出错。然后添加以质疑您添加的包，以及新的错误列表。

@ToolmakerSteve 谢谢，从项目中删除所有包并重新添加它们。它解决了这个问题。

【参考方案1】：

在 migration 之后，我们需要对工具未涵盖的场景进行一些手动命名空间更改。

AndroidX 替换了 Android support libraries，因此任何对 Android 支持库类型的引用都必须替换为对 AndroidX 类型的引用。

下表显示了命名空间的变化

Android support library namespace	AndroidX namespace
Android.Support.V4.App	AndroidX.Core.App
Android.Support.V4.Content	AndroidX.Core.Content
Android.Support.V4.App	AndroidX.Fragment.App
Android.Support.V7.App	AndroidX.AppCompat.App
Android.Support.V7.Widget	AndroidX.AppCompat.Widget

更多：https://github.com/xamarin/AndroidX/blob/main/mappings/androidx-class-mapping.csv.

更多详情请参考链接：

https://docs.microsoft.com/en-us/xamarin/xamarin-forms/troubleshooting/questions/forms5-migration#use-androidx-types

https://docs.microsoft.com/en-us/xamarin/xamarin-forms/platform/android/androidx-migration

更新

删除所有包并在项目中重新添加。

【讨论】：

谢谢，我已经更改了命名空间名称。为了解决这个问题，我必须从项目中删除所有包并重新添加它们。