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How do I show multiple notifications on Android?
Set a group summary
- 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) .
Why do I get multiple notifications for one message?
Usually duplicate notifications occur due to sending the same push data multiple times. … Our Android SDKs prevent duplicate notifications by checking the notification payload for OneSignal specific data. Android devices with 2 copies of the app installed on the device can also receive duplicate notifications.