Question 77302 in Flutter Question posted in
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Flutter shared prefernce return NULL

I have next piece of flutter code, to get shared preference key-value

I do understand why _blueUriInit is always NULL

enter image description here

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3

Answers


  1. 0

    I assume that you are forgot to provide the value for that key before call to get its value, you need to first assign value to it first:

    Future<bool> saveData(String key, dynamic value) async {
  final prefs = await SharedPreferences.getInstance();
  return prefs.setString(key, value);
}

    and call it like this:

    void initState() {
   saveData('blueUri', 'test');

   setState(() {
     _blueUriInit = getValue('blueUri');
   });
   super.initState();
}

    now next time you open your app, getValue should return you test.

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  2. 0

    you can create this function for setting value

    static setUserID(String key, String value) async {
   final SharedPreferences preferences = await SharedPreferences.getInstance();
   preferences.setString(key, value);
}

    Use case :

    await SharedValue.setUserID("Email", "[email protected]");

    And For getting value from shared preference you can use this function

    static Future<String?> getUserID(String key) async {
    final SharedPreferences preferences = await SharedPreferences.getInstance();
    return preferences.getString(key);
}

    Use case :

    userName = await SharedValue.getUserID("Email");
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  3. 0

    First you need to setString with key and value (name is key)

    Future setValue() async {
  final prefs = await SharedPreferences.getInstance();
  prefs.setString("name", "Hitarth");
}

    getString with key (here i took "name" as key)

    Future getValue(String key) async {
  final prefs = await SharedPreferences.getInstance();
  String value = prefs.getString(key) ?? "NULL";
  return value;
}

    store in variable callin getValue

    void initState() {
  setState(() {
    _blueUriInit = getValue("name");
  });
  super.initState();
}
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