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

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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));
}
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