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SharedPreferences_riverpod
Make it easier to access SharePreferences using Riverpod's Provider.
- https://pub.dev/packages/shared_preferences
- https://pub.dev/packages/riverpod
Usage
Primitive type or List<String>
- Create
Provider with createPrefProvider and generics parameter.
final booPrefProvider = createPrefProvider<bool>(
prefs: (_) => prefs,
prefKey: "boolValue",
defaultValue: false,
);
- Refer values with
ref.watch(provider).
- Update value with
await ref.read(provider).update(newValue);.
Consumer(builder: (context, ref, _) {
return CheckboxListTile(
title: Text('checkbox'),
value: ref.watch(booPrefProvider),
onChanged: (v) async {
if (v != null) await ref.read(booPrefProvider.notifier).update(v);
},
);
}
Other types
- Create
Provider with createPrefProvider and map functions.
enum EnumValues {
foo,
bar,
}
final enumPrefProvider = createMapPrefProvider<EnumValues>(
prefs: (_) => prefs,
prefKey: "enumValue",
mapFrom: (v) => EnumValues.values
.firstWhere((e) => e.toString() == v, orElse: () => EnumValues.foo),
mapTo: (v) => v.toString(),
);
- Refer values with
ref.watch(provider).
- Update value with
await ref.read(provider).update(newValue);.
Consumer(builder: (context, ref, _) {
return RadioListTile(
title: Text('value1'),
value: EnumValues.foo,
groupValue: ref.watch(enumPrefProvider),
onChanged: (EnumValues? v) async {
if (v != null) await ref.read(enumPrefProvider.notifier).update(v);
},
);
}
Example
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:shared_preferences_riverpod/shared_preferences_riverpod.dart';
late SharedPreferences prefs;
final booPrefProvider = createPrefProvider<bool>(
prefs: (_) => prefs,
prefKey: "boolValue",
defaultValue: false,
);
enum EnumValues {
foo,
bar,
}
final enumPrefProvider = createMapPrefProvider<EnumValues>(
prefs: (_) => prefs,
prefKey: "enumValue",
mapFrom: (v) => EnumValues.values
.firstWhere((e) => e.toString() == v, orElse: () => EnumValues.foo),
mapTo: (v) => v.toString(),
);
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
prefs = await SharedPreferences.getInstance();
runApp(ProviderScope(child: MyApp()));
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Sample',
home: Scaffold(
appBar: AppBar(),
body: Consumer(builder: (context, ref, _) {
return ListView(children: [
CheckboxListTile(
title: Text('BoolPrefNotifier ${ref.watch(booPrefProvider)}'),
value: ref.watch(booPrefProvider),
onChanged: (v) async {
if (v != null)
await ref.read(booPrefProvider.notifier).update(v);
},
),
RadioListTile(
title: Text('${EnumValues.foo.toString()}'),
value: EnumValues.foo,
groupValue: ref.watch(enumPrefProvider),
onChanged: (EnumValues? v) async {
if (v != null)
await ref.read(enumPrefProvider.notifier).update(v);
},
),
RadioListTile(
title: Text('${EnumValues.bar.toString()}'),
value: EnumValues.bar,
groupValue: ref.watch(enumPrefProvider),
onChanged: (EnumValues? v) async {
if (v != null)
await ref.read(enumPrefProvider.notifier).update(v);
},
),
]);
}),
),
);
}
}
