构建 xamarin android 项目失败，错误 XA4212 [英] Build xamarin android project unsucessfully,error XA4212

问题描述

在visual Studio 2017 15.4，一切正常.但我升级到15.5后，我的xamarin android项目无法成功构建，显示:

At visual Studio 2017 15.4,everything goes fine.But after I upgrated to 15.5,my xamarin android project can not be built successfully,showing:

error XA4212: Type `Android.Support.V4.App.JobIntentService/JobServiceEngineImpl` implements `Android.Runtime.IJavaObject` but does not inherit `Java.Lang.Object` or `Java.Lang.Throwable`. This is not supported.

推荐答案

按照@Ironman 的回答，Xamarin.Android 8.0 会发生这种情况，因此我在项目 .csproj 文件中将该属性设置为 false在以下部分.

Following @Ironman answer, this happens with Xamarin.Android 8.0, so I set the property to false in the project .csproj file in the following section.

<PropertyGroup>
    <!-- Other properties -->
    <AndroidErrorOnCustomJavaObject>false</AndroidErrorOnCustomJavaObject>
</PropertyGroup>

在大多数情况下您应该添加该属性，因为它默认不存在.

In most cases you should add the property as it doesn't exist by default.

现在您可以正常构建和运行应用程序，只有一个警告.

Now you can build and run the app normally, only with a warning.

请注意 .csproj 文件中的其他 PropertyGroup 标记，这些标记特定于构建条件.

Beware that are other PropertyGroup tags inside the .csproj file, that are specific to build conditions.

您可以在 https 中查看其他构建属性和配置://github.com/xamarin/xamarin-android/blob/master/Documentation/build_process.md

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