SharedPreferences common class, first add dependencies " shared_preferences: "^0.4.2" "

shared_preference.dart

import 'package:shared_preferences/shared_preferences.dart';

class SharedPreference {
  SharedPreferences prefs;

  init() async {
    prefs = await SharedPreferences.getInstance();
  }

  void setStringValue(String key, String value) {
    prefs.setString(key, value);
  }

  String getStringValue(String key) {
    return prefs.getString(key);
  }

  void setIntValue(String key, int value) {
    prefs.setInt(key, value);
  }

  int getIntValue(String key) {
    return prefs.getInt(key);
  }

  void setBoolValue(String key, bool value) {
    prefs.setBool(key, value);
  }

  bool getBoolValue(String key) {
    return prefs.getBool(key);
  }
}