streaming_shared_preferences 1.0.0-dev

A reactive, Stream-based wrapper for SharedPreferences

example/lib/main.dart

import 'dart:async';

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

Future<void> main() async {
  final preferences = await StreamingSharedPreferences.instance;
  runApp(MyApp(preferences));
}

class MyApp extends StatelessWidget {
  MyApp(this.preferences);
  final StreamingSharedPreferences preferences;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(preferences),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage(this.preferences);
  final StreamingSharedPreferences preferences;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  Preference<int> _counter;

  @override
  void initState() {
    super.initState();
    _counter = widget.preferences.getInt('counter', defaultsTo: 0);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Streaming SharedPreferences'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              'You have pushed the button this many times:',
            ),
            StreamBuilder<int>(
              stream: _counter,
              initialData: 0,
              builder: (context, snapshot) {
                return Text(
                  '${snapshot.data}',
                  style: Theme.of(context).textTheme.display1,
                );
              },
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          final currentValue = _counter.value();
          _counter.set(currentValue + 1);
        },
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}