How do you process push notifications received while the app is in the background?

[Osmosis311]

How can we help?

Is there a way to receive an event / handle a push notification that's received when my app is in the background? I'm using the OneSignal Xamarin SDK, and in the documentation it says to add a notification service extension, and inherit from this class OSRemoteNotificationReceivedHandler, but that class isn't found anywhere in the SDK.

Is there a way to do this in the Xamarin SDK?

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[brismithers]

Hi @Osmosis311 apologies for the delay! The documentation for adding a NotificationServiceExtension is an iOS-specific step. There is no equivalency on Android that can be exploited by the Xamarin SDK.

Note I believe there is a path where you can create an Android native NotificationServiceExtension,it would be written in Java/Kotlin and would extend the OSRemoteNotificationReceivedHandler class you reference above. The underlying technical reason for not having a Xamarin SDK equivalent is, we have not found a way to "get into" the Xamarin environment when your app is driven through the receiving of a notification while the app is in the background/not open.

Staying within the Xamarin SDK, you are limited to the OneSignal.Default. NotificationWillShow event, which unfortunately is limited to notifications received while the app is in the foreground.

Please let me know if you have any follow up questions. Thanks!

[brismithers]

@Osmosis311 would you be able to share your use case for why you need to receive control when receiving a notification and your app isn't in the foreground?

[Osmosis311]

Yes. Critical notifications. If the user has their phone completely silenced, for specific types of critical alerts, I need to be able to run code when a notification is received and my app isn’t in the foreground that utilizes MediaManager to play a sound to get the users attention (this is of course with their consent. The use case here is volunteer emergency responders. For example, they may be in an office setting and don’t want to be disturbed except for emergencies happening nearby).

I think I figured it out, though. I registered a (generic) notification receiver and that seems to be working exactly the way I want.

On Tue, Jan 17, 2023 at 10:15 AM Brian Smith @.***> wrote:

@Osmosis311 https://github.com/Osmosis311 would you be able to share your use case for why you need to receive control when receiving a notification and your app isn't in the foreground?

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[brismithers]

thanks for the feedback @Osmosis311, I'll pass that along internally as a scenario to account for. Yes a generic notification receiver would work as well good thought. If you're up for it please post a version of what you did here and I can try to incorporate it as a solution into our docs.

[Tock3r]

I need that badly too. @Osmosis311, your solution would be very helpful. :) In my use case, security guards receive an alarm notification with status messages that they have to acknowledge. If they ignore the notification, the app will periodically remind them with a warning sound.

[Osmosis311]

Here's the code for the receiver.

Add this to MainActivity.cs in the OnCreate function:

IntentFilter filter = new IntentFilter("com.google.android.c2dm.intent.RECEIVE"); RegisterReceiver(new PushReceiver(), filter);

[Tock3r]

Awesome, it works. Thank you. I had it similar, I only registered the receiver in the launch activity and not in main :D