c# - 检查或捕捉警告未能在 channel 上发布通知

Question

我知道为什么在我没有创建 channel 的情况下会出现此警告，但这不是问题所在，我想知道的是如何捕获它或检查 channel 是否存在于代码中以便在发布通知之前处理它。

"Developper warning for package "com.app" failed to post notificationon channel "channel1" see log for more details"thanks.

Answer 1

您可以使用 NotificationManager.GetNotificationChannel，它将返回 NotificationChannel 的实例(如果存在)或 null(如果不存在)。

简单示例:

using (var notificationManager = NotificationManager.FromContext(ApplicationContext))
{
    var channelName = "SomeChannelName";
    if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
    {
        NotificationChannel channel = notificationManager.GetNotificationChannel(channelName);
        if (channel == null)
        {
            channel = new NotificationChannel(channelName, channelName, NotificationImportance.Low)
            {
                LockscreenVisibility = NotificationVisibility.Public
            };
            channel.SetShowBadge(true);
            notificationManager.CreateNotificationChannel(channel);
        }
    }
    // build your notification
}