如何构建使用Xamarin.Forms.Maps的安卓项目？

Question

我用.Net标准2.0创建了一个新的Xamarin解决方案，它构建了OK。

然后添加一个NuGet Xamarin.Forms.Maps：

并出现此生成错误：

Severity    Code    Description Project File    Line    Suppression State
Error       An error occurred trying to install required android components on Project 'eCidadaoMobile.Android'.
Project 'eCidadaoMobile.Android' requires the following components installed on your machine: 
Xamarin.GooglePlayServices.Base
JavaLibraryReference: https://dl-ssl.google.com/android/repository/google_m2repository_r24.zip-m2repository/com/google/android/gms/play-services-base/8.4.0/play-services-base-8.4.0.aar-8.4.0
AndroidResources: https://dl-ssl.google.com/android/repository/google_m2repository_r24.zip-m2repository/com/google/android/gms/play-services-base/8.4.0/play-services-base-8.4.0.aar-8.4.0
Xamarin.GooglePlayServices.Basement
JavaLibraryReference: https://dl-ssl.google.com/android/repository/google_m2repository_r24.zip-m2repository/com/google/android/gms/play-services-basement/8.4.0/play-services-basement-8.4.0.aar-8.4.0
AndroidResources: https://dl-ssl.google.com/android/repository/google_m2repository_r24.zip-m2repository/com/google/android/gms/play-services-basement/8.4.0/play-services-basement-8.4.0.aar-8.4.0
Xamarin.GooglePlayServices.Maps
JavaLibraryReference: https://dl-ssl.google.com/android/repository/google_m2repository_r24.zip-m2repository/com/google/android/gms/play-services-maps/8.4.0/play-services-maps-8.4.0.aar-8.4.0
AndroidResources: https://dl-ssl.google.com/android/repository/google_m2repository_r24.zip-m2repository/com/google/android/gms/play-services-maps/8.4.0/play-services-maps-8.4.0.aar-8.4.0


Please double-click here to install it.

Intallation Errors: XA5207 Please install package: 'GPS Base' available in SDK installer. Java library file 'C:\Users\tonyv\AppData\Local\Xamarin\Xamarin.GooglePlayServices.Base\8.4.0\embedded\classes.jar' doesn't exist.
XA5207 Please install package: 'GPS Basement' available in SDK installer. Java library file 'C:\Users\tonyv\AppData\Local\Xamarin\Xamarin.GooglePlayServices.Basement\8.4.0\content\classes.jar' doesn't exist.
XA5207 Please install package: 'GPS Maps' available in SDK installer. Java library file 'C:\Users\tonyv\AppData\Local\Xamarin\Xamarin.GooglePlayServices.Maps\8.4.0\content\classes.jar' doesn't exist.         0   

如果我双击错误消息，什么都不会发生.

如何和在何处安装这些所需的文件？

Answer 1

在路径C:\Users\UserName\AppData\Local\Xamarin下，删除Xamarin.GooglePlayServices文件夹，以便在下一次启动期间重新下载它们。