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
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