I can create notifications for single user and for all users in my app, but I can't understand and find information about notification with create topic. For this need create separate service and how do my topics dynamic?
There is no need to create a service when you want to subscribe to a topic. Just call anywhere in your app:
FirebaseMessaging.getInstance().subscribeToTopic("news");
Also see the section Subscribe the client app to a topic in the Firebase documentation.
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