shared_preferences_android 2.0.11 shared_preferences_android: ^2.0.11 copied to clipboard
Android implementation of the shared_preferences plugin
// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// ignore_for_file: public_member_api_docs
import 'package:flutter/material.dart';
import 'package:shared_preferences_platform_interface/shared_preferences_platform_interface.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return const MaterialApp(
title: 'SharedPreferences Demo',
home: SharedPreferencesDemo(),
);
}
}
class SharedPreferencesDemo extends StatefulWidget {
const SharedPreferencesDemo({Key? key}) : super(key: key);
@override
SharedPreferencesDemoState createState() => SharedPreferencesDemoState();
}
class SharedPreferencesDemoState extends State<SharedPreferencesDemo> {
final SharedPreferencesStorePlatform _prefs =
SharedPreferencesStorePlatform.instance;
late Future<int> _counter;
// Includes the prefix because this is using the platform interface directly,
// but the prefix (which the native code assumes is present) is added by the
// app-facing package.
static const String _prefKey = 'flutter.counter';
Future<void> _incrementCounter() async {
final Map<String, Object> values = await _prefs.getAll();
final int counter = ((values[_prefKey] as int?) ?? 0) + 1;
setState(() {
_counter = _prefs.setValue('Int', _prefKey, counter).then((bool success) {
return counter;
});
});
}
@override
void initState() {
super.initState();
_counter = _prefs.getAll().then((Map<String, Object> values) {
return (values[_prefKey] as int?) ?? 0;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('SharedPreferences Demo'),
),
body: Center(
child: FutureBuilder<int>(
future: _counter,
builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.waiting:
return const CircularProgressIndicator();
default:
if (snapshot.hasError) {
return Text('Error: ${snapshot.error}');
} else {
return Text(
'Button tapped ${snapshot.data} time${snapshot.data == 1 ? '' : 's'}.\n\n'
'This should persist across restarts.',
);
}
}
})),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
),
);
}
}