當應用程序在後臺時，我的FCM通知不會擴展

我正在實施FCM來推送通知，但我試圖在通知內容很大時擴展通知。
當應用程序在後臺當應用程序在後臺時，我的FCM通知不會擴展

這裏是我的代碼

PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT); 
    Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION); 

    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this) 
      .setSmallIcon(R.drawable.ic_stat_new_logo).setTicker(title).setWhen(0) 
      .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_stat_new_logo)) 
      .setContentTitle("SuezApp") 
      .setContentText(remoteMessage.getNotification().getBody()) 
      .setAutoCancel(true) 
      .setStyle(new NotificationCompat.BigTextStyle().bigText(title)) 
      .setStyle(new NotificationCompat.BigTextStyle().bigText(remoteMessage.getNotification().getBody())) 
      .setPriority(Notification.PRIORITY_MAX) 
      .setSound(defaultSoundUri) 
      .setContentIntent(pendingIntent); 
    final NotificationCompat.BigTextStyle style = new NotificationCompat.BigTextStyle(notificationBuilder); 
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); 
    notificationManager.notify(0, notificationBuilder.build());

我如何展開時，應用程序在後臺，不能執行？

來源

2017-02-12 anwar samir