We are working on a chat app in Xmarine android in c#. Here how to work with push notification when a new message comes in a group in Xmarine Android.
To push notification to Xamarin.Android app, try to use Firebase Cloud Messaging (FCM).
Here are tutorials about Implementing Push Notifications in Android Apps, you can refer to:https://devblogs.microsoft.com/xamarin/implementing-push-notifications-android-apps/https://stackoverflow.com/questions/54210702/how-to-send-push-notification-to-xamarin-android-app
You can visit on this https://docs.microsoft.com/en-us/azure/notification-hubs/xamarin-notification-hubs-push-notifications-android-gcm sit to see if your can be solved.
For more information on mobile app development you can visit ArStudioz
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