如何在android中正确堆叠通知？

这是我当前的android代码：

notification = new NotificationCompat.Builder(this);
notification.setContentTitle(notifyFromName);
notification.setContentText(notifyMsg);

if (!msgIsProj) {
    String followText = notifyMsg + " you!";
    notification.setContentText(followText);
    notification.setGroup(GROUP_KEY_FOLLOWERS);
} else {

    notification.setContentText(notifyMsg + " " + notifyItemName);
    notification.setGroup(GROUP_KEY_PROJECTS);
}
notification.setTicker(getString(R.string.titlePushNotify));
notification.setSmallIcon(R.drawable.ic_pushnotify);
notification.setGroupSummary(true);
PendingIntent contentIntent = PendingIntent.getActivity(this, 1000,
                              newIntentMsg, PendingIntent.FLAG_CANCEL_CURRENT);
notification.setContentIntent(contentIntent);
notification.setAutoCancel(true);
manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

if (notifyMsg != null && !notifyMsg.equals("")) {

    manager.notify(0, notification.build());
}

正如您所看到的，我添加了

setGroup

和

setGroupSummary

——但是，我在android文档中看到，我还必须添加一个摘要通知。有点困惑我是如何做到这一点的，如果是这样的话，我该如何调用addLine-它从哪里获取信息

如果有人知道我如何实现它，或者举个例子就好了