Flutter流式设置管理插件bw_streamed_settings的使用
Flutter流式设置管理插件bw_streamed_settings的使用
bw_streamed_settings
插件是一个用于提供设备设置状态的流式插件。目前支持的设置包括:
- 蓝牙
- GPS
- 电源节省模式
使用方法
以下为一个使用示例。
示例代码
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:bw_streamed_settings/bw_streamed_settings.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
[@override](/user/override)
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
// 定义流订阅对象
StreamSubscription<dynamic>? streamSubscriptionGps;
StreamSubscription<dynamic>? streamSubscriptionPowerSaveMode;
StreamSubscription<dynamic>? streamSubscriptionBluetooth1;
StreamSubscription<dynamic>? streamSubscriptionBluetooth2;
// 定义设备设置状态变量
bool? gpsEnabled;
bool? powerSaveModeEnabled;
bool? bluetoothEnabled1;
bool? bluetoothEnabled2;
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('BW流式设置管理'),
),
body: Center(
child: Column(
children: [
// 显示GPS状态
Row(
children: [
Expanded(child: Text('GPS已启用: $gpsEnabled')),
TextButton(
onPressed: () async {
if (streamSubscriptionGps == null) {
// 开始监听GPS状态
streamSubscriptionGps = BwStreamedSettings.gpsEnabledStream.listen((event) {
setState(() {
gpsEnabled = event;
});
});
} else {
// 停止监听GPS状态
await streamSubscriptionGps?.cancel();
setState(() {
streamSubscriptionGps = null;
});
}
},
child: Text((streamSubscriptionGps == null) ? '开始监听' : '停止监听'),
),
],
),
// 显示电源节省模式状态
Row(
children: [
Expanded(child: Text('电源节省模式已启用: $powerSaveModeEnabled')),
TextButton(
onPressed: () async {
if (streamSubscriptionPowerSaveMode == null) {
// 开始监听电源节省模式状态
streamSubscriptionPowerSaveMode = BwStreamedSettings.powerSaveModeEnabledStream.listen((event) {
setState(() {
powerSaveModeEnabled = event;
});
});
} else {
// 停止监听电源节省模式状态
await streamSubscriptionPowerSaveMode?.cancel();
setState(() {
streamSubscriptionPowerSaveMode = null;
});
}
},
child: Text(
(streamSubscriptionPowerSaveMode == null) ? '开始监听' : '停止监听'),
),
],
),
const SizedBox(height: 30),
const Text('测试同时监听两个蓝牙开关流'),
// 显示第一个蓝牙状态
Row(
children: [
Expanded(child: Text('#1 蓝牙已启用: $bluetoothEnabled1')),
TextButton(
onPressed: () async {
if (streamSubscriptionBluetooth1 == null) {
// 开始监听第一个蓝牙状态
streamSubscriptionBluetooth1 = BwStreamedSettings.bluetoothEnabledStream.listen((event) {
setState(() {
bluetoothEnabled1 = event;
});
});
} else {
// 停止监听第一个蓝牙状态
await streamSubscriptionBluetooth1?.cancel();
setState(() {
streamSubscriptionBluetooth1 = null;
});
}
},
child: Text(
(streamSubscriptionBluetooth1 == null) ? '开始监听' : '停止监听'),
),
],
),
// 显示第二个蓝牙状态
Row(
children: [
Expanded(child: Text('#2 蓝牙已启用: $bluetoothEnabled2')),
TextButton(
onPressed: () async {
if (streamSubscriptionBluetooth2 == null) {
// 开始监听第二个蓝牙状态
streamSubscriptionBluetooth2 = BwStreamedSettings.bluetoothEnabledStream.listen((event) {
setState(() {
bluetoothEnabled2 = event;
});
});
} else {
// 停止监听第二个蓝牙状态
await streamSubscriptionBluetooth2?.cancel();
setState(() {
streamSubscriptionBluetooth2 = null;
});
}
},
child: Text(
(streamSubscriptionBluetooth2 == null) ? '开始监听' : '停止监听'),
),
],
),
],
),
),
),
);
}
}
更多关于Flutter流式设置管理插件bw_streamed_settings的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter流式设置管理插件bw_streamed_settings的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
bw_streamed_settings
是一个用于 Flutter 应用的流式设置管理插件。它允许你在应用中动态管理应用的设置,并且通过流式 API 来监听设置的变化。下面是如何使用 bw_streamed_settings
插件的详细步骤。
1. 添加依赖
首先,你需要在 pubspec.yaml
文件中添加 bw_streamed_settings
依赖:
dependencies:
flutter:
sdk: flutter
bw_streamed_settings: ^1.0.0 # 请使用最新版本
然后运行 flutter pub get
来安装依赖。
2. 初始化设置管理器
在你的应用中,你需要初始化 StreamedSettings
对象。通常,你可以在 main.dart
文件中进行初始化:
import 'package:bw_streamed_settings/bw_streamed_settings.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
// 初始化设置管理器
final settings = StreamedSettings();
runApp(MyApp(settings: settings));
}
3. 在应用中使用设置
在你的应用中使用 StreamedSettings
来获取和更新设置:
import 'package:flutter/material.dart';
import 'package:bw_streamed_settings/bw_streamed_settings.dart';
class MyApp extends StatelessWidget {
final StreamedSettings settings;
MyApp({required this.settings});
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: SettingsScreen(settings: settings),
);
}
}
class SettingsScreen extends StatelessWidget {
final StreamedSettings settings;
SettingsScreen({required this.settings});
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Settings'),
),
body: StreamBuilder<Map<String, dynamic>>(
stream: settings.stream,
builder: (context, snapshot) {
if (!snapshot.hasData) {
return Center(child: CircularProgressIndicator());
}
final settingsMap = snapshot.data!;
return ListView(
children: [
SwitchListTile(
title: Text('Enable Notifications'),
value: settingsMap['notifications'] ?? false,
onChanged: (value) {
settings.set('notifications', value);
},
),
// 添加更多设置项
],
);
},
),
);
}
}
4. 持久化设置
默认情况下,bw_streamed_settings
会将设置存储在内存中。如果你希望将设置持久化到本地存储(例如 SharedPreferences),你可以使用 PersistedStreamedSettings
:
import 'package:bw_streamed_settings/bw_streamed_settings.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
// 使用持久化设置管理器
final settings = await PersistedStreamedSettings.create();
runApp(MyApp(settings: settings));
}
5. 自定义设置存储
如果你不想使用默认的 SharedPreferences 作为存储后端,你可以实现自己的存储后端。你只需要实现 SettingsStorage
接口,并将其传递给 PersistedStreamedSettings
:
class CustomStorage implements SettingsStorage {
[@override](/user/override)
Future<Map<String, dynamic>> load() async {
// 从自定义存储中加载设置
}
[@override](/user/override)
Future<void> save(Map<String, dynamic> settings) async {
// 将设置保存到自定义存储中
}
}
void main() async {
WidgetsFlutterBinding.ensureInitialized();
// 使用自定义存储
final settings = await PersistedStreamedSettings.create(storage: CustomStorage());
runApp(MyApp(settings: settings));
}