未能成功构建Xamarin Android项目，错误XA4212 [英] Build xamarin android project unsucessfully,error XA4212

问题描述

在Visual Studio 2017 15.4上，一切都很好.但是当我升级到15.5之后，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

在@Ironman答案之后，这发生在Xamarin.Android 8.0中，因此我在项目.csproj文件中将该属性设置为 false 在下一节中.

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，您应该添加属性，因为默认情况下该属性不存在.

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

现在，仅在出现警告的情况下，您才能正常构建和运行该应用程序.

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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