相关疑难解决方法(0)

我在Android Studio中创建了一个新项目,并添加了Google地图活动.

我收到这些警告:

warning: com/google/android/gms/maps/GoogleMap.class(com/google/android/gms/maps:GoogleMap.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: com/google/android/gms/maps/SupportMapFragment.class(com/google/android/gms/maps:SupportMapFragment.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: com/google/android/gms/maps/model/LatLng.class(com/google/android/gms/maps/model:LatLng.class): major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: com/google/android/gms/maps/model/MarkerOptions.class(com/google/android/gms/maps/model:MarkerOptions.class): …

所以我试图将我的新Android应用程序发布到Google PlayStore.从阅读本教程,我了解到我必须在将应用程序发布到PlayStore之前对其进行签名.我和教程完全一样.将其上传到PlayStore后,我尝试在我的设备上安装该应用程序.我收到消息"包文件未正确签名".这是strage ..在xamaran工作室,我收到消息"包成功签名".

如果我尝试从设备上的apk安装应用程序,我收到消息"无法安装"

这可能有什么问题？

我在Mac上使用Xamarin Studion.