How to subscribe to a topic in flutter FCM?

Question

I'm a new one in a flutter and in my app, I need to implement FCM with global or with a topic subscription. I successfully implemented the FCM with device token but need to send a notification to all device. how can we fix this?

score 43 · Answer 1 · edited May 16 '19 at 16:56

43

You can use subscribeToTopic to send a notification to all devices on login success or somewhere where you want to subscribe. sample code:

FirebaseMessaging firebaseMessaging = new FirebaseMessaging();

  void fcmSubscribe() {
    firebaseMessaging.subscribeToTopic('TopicToListen');
  }

  void fcmUnSubscribe() {
    firebaseMessaging.unsubscribeFromTopic('TopicToListen');
  }

Test the topic subscription by using firebase console to send the notification to a topic that the device is listening by choosing the topic in target

edited May 16 '19 at 16:56

Zvi Karp

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answered Nov 10 '18 at 06:59

Aravindh Kumar

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1

While calling subscribeToTopic got java.lang.NoSuchMethodError: FirebaseMessaging.subscribeToTopic(Unknown Source). – Mashhood Qadeer Feb 08 '19 at 19:37
is there any way to do that on flutter web – Abdulmalek Dery Jun 15 '21 at 14:39
@AbdulmalekDery I haven't tried out web part, I hope someone can can answer this. – Aravindh Kumar Jun 16 '21 at 08:05
Can you please update the answer to match the current version of flutter – Francisca Mkina Dec 01 '21 at 14:39
I had to change this to `FirebaseMessaging.instance.subscribeToTopic` to avoid the 'NoSuchMethod' error – Dennis de Best Feb 23 '22 at 10:48

score 10 · Answer 2 · answered Mar 16 '21 at 22:59

10

I could do it using the following code:

await FirebaseMessaging.instance.subscribeToTopic('TopicToListen');

answered Mar 16 '21 at 22:59

Alexandre Alves

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score 2 · Answer 3 · edited Sep 02 '21 at 05:13

2

For web version in flutter you need to call the api for topic

    Uri.parse('https://iid.googleapis.com/iid/v1/'+_token+'/rel/topics/'+topic),
            headers: <String, String>{
              'Content-Type': 'application/json',
              'Authorization':
                  'key=YOUR_FCM_KEY'
            };

token is the firebase generated token

edited Sep 02 '21 at 05:13

Stefano Sansone

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answered Sep 01 '21 at 17:45

Shatabhishek Baidya

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can you provide some more information on where to put this and how to use it? thx – LeptonByte Mar 15 '22 at 17:57
This is api call which you can call single time when you app starts – Shatabhishek Baidya Nov 05 '22 at 19:21

How to subscribe to a topic in flutter FCM?

3 Answers3