[question]: How to implement OSRemoteNotificationReceivedHandler

[nadirbongiovanni]

How can we help?

It seems that it is not possible to make the OSRemoteNotificationReceivedHandler working following the guide on https://documentation.onesignal.com/docs/service-extensions.
It seems impossible to add any piece of code to override a push notification before it is shown in the notification center.
How do I implement this in a .NET MAUI project?

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[brismithers]

Hi @nadirbongiovanni . At this time the notification service extension (NSE) does not have a platform-independent way to implement.

On iOS, .NET 6/7 does not yet have tooling support to create an iOS NSE, but we do have an example in our sample project. Specifically, take a look at this project to see how you can set up the NSE for your app.

On Android, you must implement a native NSE via these instructions.

Note there is the OneSignal.Default.NotificationWillShowevent, however that is only called when the app is in the foreground. If you do require overriding a push notification on Android while the app is in the background/closed, would you be willing to share your use case?

Thanks and hope this helps.