shared_preferences_android 2.4.0 shared_preferences_android: ^2.4.0 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, unreachable_from_main
import 'package:flutter/material.dart';
import 'package:shared_preferences_android/shared_preferences_android.dart';
import 'package:shared_preferences_platform_interface/shared_preferences_async_platform_interface.dart';
void main() {
runApp(const MyApp());
}
// #docregion Android_Options
const SharedPreferencesAsyncAndroidOptions options =
SharedPreferencesAsyncAndroidOptions(
backend: SharedPreferencesAndroidBackendLibrary.SharedPreferences,
originalSharedPreferencesOptions: AndroidSharedPreferencesStoreOptions(
fileName: 'the_name_of_a_file'));
// #enddocregion Android_Options
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
title: 'SharedPreferences Demo',
home: SharedPreferencesDemo(),
);
}
}
class SharedPreferencesDemo extends StatefulWidget {
const SharedPreferencesDemo({super.key});
@override
SharedPreferencesDemoState createState() => SharedPreferencesDemoState();
}
class SharedPreferencesDemoState extends State<SharedPreferencesDemo> {
final SharedPreferencesAsyncPlatform _prefs =
SharedPreferencesAsyncPlatform.instance!;
final SharedPreferencesAsyncAndroidOptions options =
const SharedPreferencesAsyncAndroidOptions();
static const String _counterKey = 'counter';
late Future<int> _counter;
Future<void> _incrementCounter() async {
final int? value = await _prefs.getInt(_counterKey, options);
final int counter = (value ?? 0) + 1;
setState(() {
_counter = _prefs.setInt(_counterKey, counter, options).then((_) {
return counter;
});
});
}
Future<void> _getAndSetCounter() async {
setState(() {
_counter = _prefs.getInt(_counterKey, options).then((int? counter) {
return counter ?? 0;
});
});
}
@override
void initState() {
super.initState();
_getAndSetCounter();
}
@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.none:
case ConnectionState.waiting:
return const CircularProgressIndicator();
case ConnectionState.active:
case ConnectionState.done:
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),
),
);
}
}