我仅在Oreo版本中面临一些与通知相关的问题。我按照此链接操作，并按照他的建议在卸载/安装应用程序后成功获得了自定义声音。
现在的问题是我想在我的应用程序中使用两种自定义声音，为此，我有如下代码：
private void sendNotification(NotificationBean notificationBean) {
String textTitle = notificationBean.getTitle();
String alert = notificationBean.getMessage().getAlert();
int orderId = notificationBean.getMessage().getOrderId();
String notificationType = notificationBean.getMessage().getNotificationType();
String sound = notificationBean.getMessage().getSound();
Intent intent = new Intent(this, NavigationDrawerActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
Uri soundUri;
if (notificationType.equals("Pending"))
soundUri = Uri.parse("android.resource://" + getApplicationContext().getPackageName() + "/" + R.raw.sound);
else
soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this, getString(R.string.app_name))
.setSmallIcon(R.drawable.ic_stat_name)
.setContentTitle(textTitle)
.setContentText(alert)
.setSound(soundUri)
.setContentIntent(pendingIntent)
.setPriority(NotificationCompat.PRIORITY_DEFAULT);
// Create the NotificationChannel, …