CODEWITHSUNDEEP
firebaseflutterhttpmobile
Max S
Max S

Reputation: 33

Storing a data permanent with Flutter

I am developing an app with Flutter and Firebase.

I want to store the _id with SharedPreferences permanently.

Therefore, i looked after it, but my code doesnt work at all. It always throws the error:

type 'Future' is not a subtype of type 'String'

Here is my code:

class Profile with ChangeNotifier {
  String _id;
  void setName(String name) {
    const url =
        'myurl';
    http
        .post(url, body: json.encode({'name': name, 'description': name}))
        .then((response) {
      _id = json.decode(response.body)['name'];
    });
    addID();
  }

  Future<void> updateName(String name, String id) async {
    String url =
        'myurl';
    await http.patch(url,
        body: json.encode({'name': 'Ein Titel', 'description': name}));
  }

And here are my methods with the SharedPrefs:

String getID() {
    return getIDOffline();
  }

  addID() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    prefs.setString('id', _id);
  }

  getIDOffline() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    //Return String
    String stringValue = prefs.getString('id');
    return stringValue;
  }

Upvotes: 1

Views: 100

Answers (2)

Harsh Chovatiya
Harsh Chovatiya

Reputation: 323

You have use wrong method for return string so you have to change String getID() to Future<String> getID(). And you can use like this.

getValue()async{
String value = await getID();
}

Upvotes: 1

Mijanur Rahman
Mijanur Rahman

Reputation: 1182

When you use async always try to add also Future.

like :

 Future<returnType> methodName() async { }

In your code try to change String getID(){ } to Future<String>getID() async{ }

Upvotes: 0

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