为什么我得不到通知声音(NotificationCompat.Builder) SDK26+

NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
        .setSound(Uri.parse("android.resource://" + context.getPackageName() + "/" + R.raw.notification_sound))
        .setContentTitle("Notification Title")
        .setContentText("Notification Content");

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    String channelId = "channel_id";
    CharSequence channelName = "Channel Name";
    int importance = NotificationManager.IMPORTANCE_DEFAULT;
    AudioAttributes audioAttributes = new AudioAttributes.Builder()
            .setUsage(AudioAttributes.USAGE_NOTIFICATION)
            .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
            .build();
    NotificationChannel channel = new NotificationChannel(channelId, channelName, importance);
    channel.setSound(Uri.parse("android.resource://" + context.getPackageName() + "/" + R.raw.notification_sound), audioAttributes);
    
    NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.createNotificationChannel(channel);
    
    NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId)
            .setContentTitle("Notification Title")
            .setContentText("Notification Content");
}

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    // 创建NotificationChannel
}
else {
    // 不需要创建NotificationChannel
}