设置Activity主题

在Activity开头

namespace NcuEveryDay
{
	[Activity (Label = "NcuEveryDay", MainLauncher = true, Icon = "@mipmap/icon",
		Theme = "@android:style/Theme.Holo.Light.NoActionBar")]
	public class MainActivity : Activity
	{
	...
	}
}

添加NuGet库

左侧“包”，右键添加

错误 1 Unzipping failed. Please download https://dl-ssl.google.com/android/repository/android_m2repository_r25.zip and extract it to the C:\Users\wangpeng\AppData\Local\Xamarin\Android.Support.v4\23.1.1.0\content directory. NcuEveryDay