title: Android Firebase notification have no sound
body: <p>I'm getting Firebase notification sound while app runs and not getting notification sound while app is in background. I don't know why it is happening.</p>
  
  <p>This is what I tried</p>
  
  <pre><code>Uri sound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
          if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.O) {
              @SuppressLint("WrongConstant") NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "My Notifications", NotificationManager.IMPORTANCE_MAX);
              // To Configure the notification channel.
              notificationChannel.setDescription("Sample Channel description");
              notificationChannel.enableLights(true);
              notificationChannel.setLightColor(Color.BLUE);
              notificationChannel.setVibrationPattern(new long[]{0, 1000, 500, 1000});
              notificationChannel.enableVibration(true);
              notificationManager.createNotificationChannel(notificationChannel);
          }
          NotificationCompat.Builder noBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
                  .setSmallIcon(R.drawable.gj512x512)
                  .setContentText(message)
                  .setSound(sound)
                  .setContentTitle(title)
                  .setAutoCancel(true)
                  .setContentIntent(pendingIntent);
          notificationManager.notify(1, noBuilder.build());
  }
  </code></pre>
  
  <p>Please help me with this.</p>