Xamarin表单Android中的自定义推送通知声音

Question

我希望在所有状态（已杀死，前景和背景）都收到通知时在我的应用中实现自定义通知声音。目前，我的代码在某些设备上可以运行，在体内1812，通知声音在前台模式下工作，而在其他情况下，默认通知声音在工作。在Redmi 6 Pro中，自定义通知声音不起作用。如何使其在所有设备上都能正常工作。

从MainActivity调用CreateNotificationChannel()。

 void CreateNotificationChannel()
{
    try
    {
        Android.Net.Uri sound = Android.Net.Uri.Parse(ContentResolver.SchemeAndroidResource + "://" + this.PackageName + "/" + Resource.Raw.bloom);

        if (Build.VERSION.SdkInt < BuildVersionCodes.O)
        {                  
            return;
        }

            AudioAttributes attributes = new AudioAttributes.Builder()
            .SetUsage(AudioUsageKind.NotificationRingtone)
            .Build();

        var channel = new NotificationChannel(CHANNEL_ID, "PushNotifications", NotificationImportance.High)
        {
            LockscreenVisibility = NotificationVisibility.Public,
            Importance = NotificationImportance.Max,
            LightColor = Android.Graphics.Color.Red,

        };

        channel.CanShowBadge();
        channel.SetShowBadge(true);
        channel.SetSound(sound, attributes);

        var notificationManager = (NotificationManager)GetSystemService(NotificationService);
        notificationManager.CreateNotificationChannel(channel);
    }
    catch (Exception ex)
    {
    }
}

这是我的json负载

{
"data": {
    "targetPage": "Message",
    "userType": null,
    "targetId": 4034,
    "id": "210bfd9fss-b469-46ad-bdec-e576eaffa293",
    "content_available": true,
    "android_channel_id": "test_fcm_channel",
    "sound": "bloom.wav",
    "priority": "high"
},
"notification": {
    "body": "Hello world",
    "title": TestApp
    "sound": "bloom.wav",
    "click_action": ""

},
"priority": "high",
"condition": null,
"to": "cpVcLtt4Y0M:APA91bEHeweyfcfgvhjbnkmlXiVFb1WBnOe7HaPsVGIyp0RhaPcVEHpq_sJFY5EWVZyhYotdN9ZmToavMpl-FbJfG7Cm4C6SHy9o69obnTW6W2d3wogeji-g6aRolLxfMJtNu16jFR92E44RUQyZc_ZV"
}