使用 flutter_settings_screen 从另一个页面检索存储的共享首选项值
retrieve stored shared preference value from another page with flutter_settings_screen
我正在使用这个插件 flutter_settings_screen 但无法弄清楚如何从另一个页面获取存储值。我应该使用 Settings.getValue<bool>('key_wifi', false)
从 "AppSettings" 页面
检索 key_wifi
这是我处理的完整简单代码:
import 'package:draft/app_settings.dart';
import 'package:flutter/material.dart';
import 'package:flutter_settings_screens/flutter_settings_screens.dart';
final bool isWifiEnabled = Settings.getValue<bool>('key_wifi', false);
void main() {
initSettings();
runApp(MyApp());
}
void initSettings() {
SharePreferenceCache spCache = SharePreferenceCache()
..init();
Settings.init(cacheProvider: spCache);
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MyHomePage(title: 'Flutter Demo Home Page');
}
}
class MyHomePage extends StatefulWidget {
final String title;
const MyHomePage({Key key, this.title}) : super(key: key);
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'App Settings Demo',
theme: ThemeData.dark(),
home: Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
children: <Widget>[
isWifiEnabled? Text("Wifi is ON") : Text("Wifi is OFF"),
RaisedButton(
child: Text("Open Settings"),
onPressed: () {
Navigator.push(context, MaterialPageRoute(
builder: (context) => AppSettings()));
},
),
],
),
),
),
);
}
}
class AppSettings extends StatefulWidget {
@override
_AppSettingsState createState() => _AppSettingsState();
}
String keywifi = 'keywifi';
class _AppSettingsState extends State<AppSettings> {
final bool isWifiEnabled = Settings.getValue<bool>(keywifi, false);
@override
Widget build(BuildContext context) {
return Container(
child: SettingsScreen(
title: "Application Settings",
children: [
SettingsGroup(
title: 'Single Choice Settings',
children: <Widget>[
SwitchSettingsTile(
settingKey: 'key_wifi',
title: 'Wi-Fi',
enabledLabel: 'Enabled',
disabledLabel: 'Disabled',
leading: Icon(Icons.wifi),
onChange: (value) {
debugPrint('keywifi: $value');
},
),
],
),
],
),
);
}
}
您可以复制粘贴运行下面的完整代码
第 1 步:您需要 await
initSettings()
第 2 步:您需要 await spCache.init();
Future<void> initSettings() async {
SharePreferenceCache spCache = SharePreferenceCache();
await spCache.init();
await Settings.init(cacheProvider: spCache);
}
第 3 步:直接使用 Settings.getValue
Settings.getValue<bool>('key_wifi', false)
? Text("Wifi is ON")
: Text("Wifi is OFF"),
第 4 步:await Navigator.push
和 setState
onPressed: () async {
await Navigator.push(context,
MaterialPageRoute(builder: (context) => AppSettings()));
setState(() {});
第 5 步:打字错误 String keywifi = 'keywifi';
将 'keywifi' 更改为 'key_wifi'
工作演示
完整代码
//import 'package:draft/app_settings.dart';
import 'package:flutter/material.dart';
import 'package:flutter_settings_screens/flutter_settings_screens.dart';
//final bool isWifiEnabled = Settings.getValue<bool>('key_wifi', false) ?? false;
Future<void> main() async {
await initSettings();
runApp(MyApp());
}
Future<void> initSettings() async {
SharePreferenceCache spCache = SharePreferenceCache();
await spCache.init();
await Settings.init(cacheProvider: spCache);
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'App Settings Demo',
theme: ThemeData.dark(),
home: MyHomePage(title: 'Flutter Demo Home Page'));
}
}
class MyHomePage extends StatefulWidget {
final String title;
const MyHomePage({Key key, this.title}) : super(key: key);
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
children: <Widget>[
Settings.getValue<bool>('key_wifi', false)
? Text("Wifi is ON")
: Text("Wifi is OFF"),
RaisedButton(
child: Text("Open Settings"),
onPressed: () async {
await Navigator.push(context,
MaterialPageRoute(builder: (context) => AppSettings()));
setState(() {});
},
),
],
),
),
);
}
}
class AppSettings extends StatefulWidget {
@override
_AppSettingsState createState() => _AppSettingsState();
}
String keywifi = 'key_wifi';
class _AppSettingsState extends State<AppSettings> {
final bool isWifiEnabled = Settings.getValue<bool>(keywifi, false);
@override
Widget build(BuildContext context) {
return Container(
child: SettingsScreen(
title: "Application Settings",
children: [
SettingsGroup(
title: 'Single Choice Settings',
children: <Widget>[
SwitchSettingsTile(
settingKey: 'key_wifi',
title: 'Wi-Fi',
enabledLabel: 'Enabled',
disabledLabel: 'Disabled',
leading: Icon(Icons.wifi),
onChange: (value) {
debugPrint('keywifi: $value');
},
),
],
),
],
),
);
}
}
我正在使用这个插件 flutter_settings_screen 但无法弄清楚如何从另一个页面获取存储值。我应该使用 Settings.getValue<bool>('key_wifi', false)
从 "AppSettings" 页面
这是我处理的完整简单代码:
import 'package:draft/app_settings.dart';
import 'package:flutter/material.dart';
import 'package:flutter_settings_screens/flutter_settings_screens.dart';
final bool isWifiEnabled = Settings.getValue<bool>('key_wifi', false);
void main() {
initSettings();
runApp(MyApp());
}
void initSettings() {
SharePreferenceCache spCache = SharePreferenceCache()
..init();
Settings.init(cacheProvider: spCache);
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MyHomePage(title: 'Flutter Demo Home Page');
}
}
class MyHomePage extends StatefulWidget {
final String title;
const MyHomePage({Key key, this.title}) : super(key: key);
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'App Settings Demo',
theme: ThemeData.dark(),
home: Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
children: <Widget>[
isWifiEnabled? Text("Wifi is ON") : Text("Wifi is OFF"),
RaisedButton(
child: Text("Open Settings"),
onPressed: () {
Navigator.push(context, MaterialPageRoute(
builder: (context) => AppSettings()));
},
),
],
),
),
),
);
}
}
class AppSettings extends StatefulWidget {
@override
_AppSettingsState createState() => _AppSettingsState();
}
String keywifi = 'keywifi';
class _AppSettingsState extends State<AppSettings> {
final bool isWifiEnabled = Settings.getValue<bool>(keywifi, false);
@override
Widget build(BuildContext context) {
return Container(
child: SettingsScreen(
title: "Application Settings",
children: [
SettingsGroup(
title: 'Single Choice Settings',
children: <Widget>[
SwitchSettingsTile(
settingKey: 'key_wifi',
title: 'Wi-Fi',
enabledLabel: 'Enabled',
disabledLabel: 'Disabled',
leading: Icon(Icons.wifi),
onChange: (value) {
debugPrint('keywifi: $value');
},
),
],
),
],
),
);
}
}
您可以复制粘贴运行下面的完整代码
第 1 步:您需要 await
initSettings()
第 2 步:您需要 await spCache.init();
Future<void> initSettings() async {
SharePreferenceCache spCache = SharePreferenceCache();
await spCache.init();
await Settings.init(cacheProvider: spCache);
}
第 3 步:直接使用 Settings.getValue
Settings.getValue<bool>('key_wifi', false)
? Text("Wifi is ON")
: Text("Wifi is OFF"),
第 4 步:await Navigator.push
和 setState
onPressed: () async {
await Navigator.push(context,
MaterialPageRoute(builder: (context) => AppSettings()));
setState(() {});
第 5 步:打字错误 String keywifi = 'keywifi';
将 'keywifi' 更改为 'key_wifi'
工作演示
完整代码
//import 'package:draft/app_settings.dart';
import 'package:flutter/material.dart';
import 'package:flutter_settings_screens/flutter_settings_screens.dart';
//final bool isWifiEnabled = Settings.getValue<bool>('key_wifi', false) ?? false;
Future<void> main() async {
await initSettings();
runApp(MyApp());
}
Future<void> initSettings() async {
SharePreferenceCache spCache = SharePreferenceCache();
await spCache.init();
await Settings.init(cacheProvider: spCache);
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'App Settings Demo',
theme: ThemeData.dark(),
home: MyHomePage(title: 'Flutter Demo Home Page'));
}
}
class MyHomePage extends StatefulWidget {
final String title;
const MyHomePage({Key key, this.title}) : super(key: key);
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
children: <Widget>[
Settings.getValue<bool>('key_wifi', false)
? Text("Wifi is ON")
: Text("Wifi is OFF"),
RaisedButton(
child: Text("Open Settings"),
onPressed: () async {
await Navigator.push(context,
MaterialPageRoute(builder: (context) => AppSettings()));
setState(() {});
},
),
],
),
),
);
}
}
class AppSettings extends StatefulWidget {
@override
_AppSettingsState createState() => _AppSettingsState();
}
String keywifi = 'key_wifi';
class _AppSettingsState extends State<AppSettings> {
final bool isWifiEnabled = Settings.getValue<bool>(keywifi, false);
@override
Widget build(BuildContext context) {
return Container(
child: SettingsScreen(
title: "Application Settings",
children: [
SettingsGroup(
title: 'Single Choice Settings',
children: <Widget>[
SwitchSettingsTile(
settingKey: 'key_wifi',
title: 'Wi-Fi',
enabledLabel: 'Enabled',
disabledLabel: 'Disabled',
leading: Icon(Icons.wifi),
onChange: (value) {
debugPrint('keywifi: $value');
},
),
],
),
],
),
);
}
}