1. 确保应用已经请求了 "NotificationCompat.Builder" 权限：

2. 检查您的通知构建器中是否包含适当的设置，例如通道ID和通知优先级。

val notificationBuilder =
        NotificationCompat.Builder(context, channelId)
            .setSmallIcon(R.drawable.ic_notification)
            .setContentTitle(notificationTitle)
            .setContentText(notificationText)
            .setPriority(NotificationCompat.PRIORITY_HIGH)
            .setAutoCancel(true)

3. 检查权限设置。Android 12 为通知添加了新的权限控制，因此请确保您的应用已经正确设置了通知权限。

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    // Create the NotificationChannel, but only on API 26+ because
    // the NotificationChannel class is new and not in the support library
    val name = context.getString(R.string.channel_name)
    val descriptionText = context.getString(R.string.channel_description)
    val importance = NotificationManager.IMPORTANCE_DEFAULT
    val channel = NotificationChannel(channelId, name, importance).apply {
        description = descriptionText
    }
    // Register the channel with the system
    val notificationManager: NotificationManager =
        context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        notificationManager.createNotificationChannel(channel)
}

如果您仍然遇到问题，请检查与 Android 12 相关的文档以获取更多信息：https://developer.android.com/about/versions/12/notifications