So zeigen Sie mehrere Benachrichtigungen einer Gruppe?

Generiere Benachrichtigung mit mehreren Nachrichten wie Gmail

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.quemark1)
                    .setContentTitle("Title")
                    .setContentText("New Message received");
            NotificationCompat.InboxStyle inboxStyle =
                    new NotificationCompat.InboxStyle();

            inboxStyle.setBigContentTitle("doUdo");

           //Add your All messages here or use Loop to generate messages

                inboxStyle.addLine("Messgare 1");
                inboxStyle.addLine("Messgare 2");
                          .
                          .
                inboxStyle.addLine("Messgare n");


            mBuilder.setStyle(inboxStyle);
            TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);

            stackBuilder.addNextIntent(intent);

            PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent,
                    PendingIntent.FLAG_UPDATE_CURRENT);

            mBuilder.setContentIntent(pIntent);

            NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
            mBuilder.setDefaults(Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE);
            mBuilder.setAutoCancel(true);
            mNotificationManager.notify(0, mBuilder.build());

    String GROUP_KEY_WORK_EMAIL = "com.android.example.WORK_EMAIL";

Notification newMessageNotification = new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID)
        .setSmallIcon(R.drawable.new_mail)
        .setContentTitle(emailObject.getSenderName())
        .setContentText(emailObject.getSubject())
        .setLargeIcon(emailObject.getSenderAvatar())
        .setGroup(GROUP_KEY_WORK_EMAIL)
        .build();
By default, notifications are sorted according to when they were posted, but you can change order by calling setSortKey().

If alerts for a notification's group should be handled by a different notification, call setGroupAlertBehavior(). For example, if you want only the summary of your group to make noise, all children in the group should have the group alert behavior GROUP_ALERT_SUMMARY. The other options are GROUP_ALERT_ALL and GROUP_ALERT_CHILDREN.

Set a group summary
On Android 7.0 (API level 24) and higher, the system automatically builds a summary for your group using snippets of text from each notification. The user can expand this notification to see each separate notification, as shown in figure 1. To support older versions, which cannot show a nested group of notifications, you must create an extra notification that acts as the summary. This appears as the only notification and the system hides all the others. So this summary should include a snippet from all the other notifications, which the user can tap to open your app.

Note: The behavior of the group summary may vary on some device types such as wearables. To ensure the best experience on all devices and versions, always include a group summary when you create a group.
To add a group summary, proceed as follows:

Create a new notification with a description of the group—often best done with the inbox-style notification.
Add the summary notification to the group by calling setGroup().
Specify that it should be used as the group summary by calling setGroupSummary(true).
For example:

//use constant ID for notification used as group summary
int SUMMARY_ID = 0;
String GROUP_KEY_WORK_EMAIL = "com.android.example.WORK_EMAIL";

Notification newMessageNotification1 =
    new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID)
        .setSmallIcon(R.drawable.ic_notify_email_status)
        .setContentTitle(emailObject1.getSummary())
        .setContentText("You will not believe...")
        .setGroup(GROUP_KEY_WORK_EMAIL)
        .build();

Notification newMessageNotification2 =
    new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID)
        .setSmallIcon(R.drawable.ic_notify_email_status)
        .setContentTitle(emailObject2.getSummary())
        .setContentText("Please join us to celebrate the...")
        .setGroup(GROUP_KEY_WORK_EMAIL)
        .build();

Notification summaryNotification =
    new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID)
        .setContentTitle(emailObject.getSummary())
        //set content text to support devices running API level < 24
        .setContentText("Two new messages")
        .setSmallIcon(R.drawable.ic_notify_summary_status)
        //build summary info into InboxStyle template
        .setStyle(new NotificationCompat.InboxStyle()
                .addLine("Alex Faarborg  Check this out")
                .addLine("Jeff Chang    Launch Party")
                .setBigContentTitle("2 new messages")
                .setSummaryText("[email protected]"))
        //specify which group this notification belongs to
        .setGroup(GROUP_KEY_WORK_EMAIL)
        //set this notification as the summary for the group
        .setGroupSummary(true)
        .build();

NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
notificationManager.notify(emailNotificationId1, newMessageNotification1);
notificationManager.notify(emailNotificationId2, newMessageNotification2);
notificationManager.notify(SUMMARY_ID, summaryNotification);

Die Zusammenfassung der Benachrichtigungs-ID sollte gleich bleiben, so dass es nur einmal ausgeschrieben, und so können Sie aktualisieren Sie es später, wenn die Informationen in der Zusammenfassung der änderungen (nachträgliche Ergänzungen zu der Gruppe führen sollte, dass die Aktualisierung der bestehenden übersicht).