configcat_preferences_cache 1.1.0

Flutter Cache implementation for ConfigCat Dart (Flutter) SDK based on shared_preferences.

example/lib/main.dart

import 'package:configcat_client/configcat_client.dart';
import 'package:configcat_preferences_cache/configcat_preferences_cache.dart';
import 'package:flutter/material.dart';
import 'package:get_it/get_it.dart';

void main() {
  GetIt.I.registerSingleton<ConfigCatClient>(
      ConfigCatClient.get(
          sdkKey: 'PKDVCLf-Hq-h-kCzMp-L7Q/HhOWfwVtZ0mb30i9wi17GQ',
          options: ConfigCatOptions(
              // Use ConfigCat's shared preferences cache.
              cache: ConfigCatPreferencesCache(),
              logger: ConfigCatLogger(
                  // Info level logging helps to inspect the feature flag evaluation process.
                  // Use the default Warning level to avoid too detailed logging in your application.
                  level: LogLevel.info))),
      dispose: (client) => client.close());
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'ConfigCat Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.deepOrange,
      ),
      home: const MyHomePage(title: 'ConfigCat Flutter Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool _value = false;

  Future<void> _getFeatureFlagValue() async {
    final client = GetIt.I<ConfigCatClient>();
    final user = ConfigCatUser(
        identifier: '#SOME-USER-ID#', email: '[e-mail]');

    final value = await client.getValue(
        key: 'isPOCFeatureEnabled', defaultValue: false, user: user);
    setState(() {
      _value = value;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Padding(
              padding: EdgeInsets.all(20),
              child: Text(
                'Value of isPOCFeatureEnabled:',
                style: TextStyle(fontSize: 20),
              ),
            ),
            Text(
              '$_value',
              style: Theme.of(context).textTheme.headline4,
            ),
            Padding(
              padding: const EdgeInsets.all(50),
              child: TextButton(
                  onPressed: () async {
                    await _getFeatureFlagValue();
                  },
                  style: TextButton.styleFrom(
                      padding: const EdgeInsets.all(20),
                      textStyle: const TextStyle(fontSize: 30)),
                  child: const Text('Get Value')),
            ),
          ],
        ),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}