Flutter: Shared Preferences null on Startup

Question

Problem: Shared preference bool value is null on startup even though I have given it a value if prefs.getBool(\'myBool\') returns null

Answer 1

import 'package:shared_preferences/shared_preferences.dart';
 
class MySharedPreferences {
  MySharedPreferences._privateConstructor();
 
  static final MySharedPreferences instance =
      MySharedPreferences._privateConstructor();
 
  setBooleanValue(String key, bool value) async {
    SharedPreferences myPrefs = await SharedPreferences.getInstance();
    myPrefs.setBool(key, value);
  }
 
  Future getBooleanValue(String key) async {
    SharedPreferences myPrefs = await SharedPreferences.getInstance();
    return myPrefs.getBool(key) ?? false;
  }
 
}

MySharedPreferences.instance
        .getBooleanValue("key")
        .then((value) => setState(() {
              val result = value;
            }));

For more reference: Flutter Shared Preferences Tutorial