在 Oreo(+) 上，您必须通过 EnableVibration(true)在 NotificationChannel 上启用振动>.

On Oreo(+), you have to enable the vibration on the NotificationChannel via EnableVibration(true).

NotificationChannel channel;
channel = notificationManager.GetNotificationChannel(myUrgentChannel);
if (channel == null)
{
    channel = new NotificationChannel(myUrgentChannel, channelName, NotificationImportance.High);
    channel.EnableVibration(true);
    channel.EnableLights(true);
    channel.SetSound(
        RingtoneManager.GetDefaultUri(RingtoneType.Notification),
        new AudioAttributes.Builder().SetUsage(AudioUsageKind.Notification).Build()
    );
    channel.LockscreenVisibility = NotificationVisibility.Public;
    notificationManager.CreateNotificationChannel(channel);
}
channel.Dispose();