All 7 Push Notifications in Flutter (FCM) questions
More in Push Notifications in Flutter (FCM)
What is Firebase Cloud Messaging, and how does it let you actually send genuine push notifications to a Flutter app running on a user's own device? How do you properly request notification permission from a user, and what genuinely differs between how Android and iOS each respectively handle this specific particular permission request? How should you properly handle a push notification differently depending on whether your app is currently genuinely running in the foreground, running in the background, or completely fully terminated? How can you properly customize the actual visual appearance of a displayed notification, such as adding a genuinely custom sound, a specific image, or genuinely custom action buttons, using local notifications combined with FCM data messages? How should a backend server properly and securely send targeted push notifications through FCM using the Firebase Admin SDK, rather than relying purely on manually sending them directly through the Firebase console? How can you properly implement a genuinely comprehensive notification analytics strategy, tracking specific delivery rates, open rates, and overall genuine user engagement with your app's own sent push notifications?
Advertisement
Back to results for “Push Notifications”
Flutter › Push Notifications in Flutter (FCM)

How do you properly implement topic based messaging in FCM, letting you send a genuinely single targeted notification to every single device that has actually genuinely subscribed to a specific particular topic?

Intermediate

Answer

Topic based messaging lets a device properly subscribe to a genuinely specific named topic, such as sports dash news, and your own backend server can then send just one single targeted notification specifically addressed to that entire particular topic, which FCM then automatically and efficiently delivers to every single one of the potentially many thousands of individual devices that had actually genuinely subscribed to that same specific topic, avoiding the need to individually and separately track and target each single specific device token completely one by one yourself.
await FirebaseMessaging.instance.subscribeToTopic('sports-news');

// Later, unsubscribe if the user genuinely no longer wants these notifications
await FirebaseMessaging.instance.unsubscribeFromTopic('sports-news');
Real-world example A news app lets users individually subscribe to specific topics such as sports, politics, or technology, allowing their backend to efficiently send a genuinely relevant breaking news notification to potentially hundreds of thousands of interested subscribed devices with just one single targeted send request.

Common follow-ups: What genuinely practical limits exist regarding the maximum total number of separate topics a single device can actually genuinely subscribe to at once?;How does topic based messaging genuinely compare to instead properly using FCM's own dedicated user segments feature?

Networking with HTTP & Dio;Firebase Authentication in Flutter
All 7 Push Notifications in Flutter (FCM) questions