How to get the device token in flutter

Question

I'm trying to get the device token, for this i'm using FirebaseMessaging. here is my code to get the token.

@override
  void initState()  {
 FirebaseMessaging? _firebaseMessaging;
 _firebaseMessaging?.getToken().then((token){
      print("token is $token");
});
}

but it print nothing. Please help how to do this.

Answer 1

You have to create the FirebaseMessaging instance. Change to:

@override
  void initState()  {
    FirebaseMessaging _firebaseMessaging = FirebaseMessaging.instance; // Change here
    _firebaseMessaging.getToken().then((token){
      print("token is $token");
  });
}

Answer 2

if you want to save token into firestore

final FirebaseMessaging _messaging = FirebaseMessaging.instance;
late String currentToken;
String userId = FirebaseAuth.instance.currentUser!.uid;
@override
void initState() {
_messaging.getToken().then((value) {
  print(value);
  if (mounted)
    setState(() {
      currentToken = value!;
    });
 FirebaseFirestore.instance
      .collection('pushtokens')
      .doc(userId)
      .set({'token': value!, 'createdAt': DateTime.now()});
 });