Stateless Widget - Shared Preferences Example

sharedpref_stateless.dart

 import 'package:flutter/material.dart';
    import 'package:shared_preferences/shared_preferences.dart';

    void main() => runApp(MyApp());

    class MyApp extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return MaterialApp(
          theme: ThemeData(primarySwatch: Colors.blue),
          home: MyHomePage(),
        );
      }
    }

    class MyHomePage extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return Scaffold(
          appBar: AppBar(
            title: Text('Saving data'),
          ),
          body: Row(
            //mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Padding(
                padding: const EdgeInsets.all(8.0),
                child: RaisedButton(
                  child: Text('Read'),
                  onPressed: () {
                    _read();
                  },
                ),
              ),
              Padding(
                padding: const EdgeInsets.all(8.0),
                child: RaisedButton(
                  child: Text('Save'),
                  onPressed: () {
                    _save();
                  },
                ),
              ),
            ],
          ),
        );
      }

      // Replace these two methods in the examples that follow

      _read() async {
        final prefs = await SharedPreferences.getInstance();
        final key = 'my_int_key';
        final value = prefs.getInt(key) ?? 0;
        print('read: $value');
      }

      _save() async {
        final prefs = await SharedPreferences.getInstance();
        final key = 'my_int_key';
        final value = 42;
        prefs.setInt(key, value);
        print('saved $value');
      }
    }