hello guys i want to send notification to all users in my firebase by API like this :
`var serverToken ="" ;
sendNotify(String title , String body , String id) async{
await http.post(
Uri.parse(‘https://fcm.googleapis.com/fcm/send’),
headers:<String,String>{‘Content-Type’:’application/json’,
‘Authorization’:’key=$serverToken’,},
body:jsonEncode(
<String,dynamic>{
'notification':<String,dynamic>{
'body':body.toString(),
'title':title.toString()
},
'priority':'high',
'data':<String,dynamic>{
'click_action':'FLUTTER_NOTIFICATION_CLICK',
'id':id.toString()},
//’to’:’all’, <<<<<<< here i want to send it to all users not by token }));`
>Solution :
For this you should use topics ,
You need to subscribe users to the all topic and no need for tokens when sending the notification
Based on the publish/subscribe model, FCM topic messaging allows you to send a message to multiple devices that have opted in to a particular topic. You compose topic messages as needed, and FCM handles routing and delivering the message reliably to the right devices.
// subscribe to topic on each app start-up
await FirebaseMessaging.instance.subscribeToTopic('all');
and your data
jsonEncode({
'topic': "all",
'data': {
'via': 'FlutterFire Cloud Messaging!!!',
'count': _messageCount.toString(),
},
'notification': {
'title': 'Hello FlutterFire!',
'body': 'This notification (#$_messageCount) was created via FCM!',
},
});