Flutter蓝牙状态监测插件bluetooth_state的使用

Flutter蓝牙状态监测插件bluetooth_state的使用

开始使用

安装

在你的 pubspec.yaml 文件中添加以下依赖:

bluetooth_state: ^latest_version

API

检查蓝牙是否已启用

Future<bool> get isBluetoothEnable async {
  try {
    return await BluetoothState().isBluetoothEnable;
  } catch (e) {
    print(e);
    throw 'Failed to get is bluetooth enable';
  }
}

请求启用蓝牙

Future<void> requestEnableBluetooth() async {
  try {
    await BluetoothState.requestEnableBluetooth();
  } catch (e) {
    print(e);
    throw 'Failed to request enable bluetooth';
  }
}

请求禁用蓝牙

Future<void> requestDisableBluetooth() async {
  try {
    await BluetoothState.requestDisableBluetooth();
  } catch (e) {
    print(e);
    throw 'Failed to request disable bluetooth';
  }
}

示例代码

以下是一个完整的示例代码,展示了如何使用 bluetooth_state 插件来检查和控制蓝牙的状态。

import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:bluetooth_state/bluetooth_state.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  final _bluetoothStatePlugin = BluetoothState();
  bool _stateBluetooth = false;

  [@override](/user/override)
  void initState() {
    super.initState();
    isBluetoothEnable();
  }

  Future<bool?> get isBluetoothEnable async {
    bool isEnable;
    try {
      isEnable = await _bluetoothStatePlugin.isBluetoothEnable;
    } on PlatformException {
      isEnable = false;
    }
    setState(() {
      _stateBluetooth = isEnable;
    });
  }

  // 平台消息是异步的,因此我们在异步方法中初始化。
  Future<void> requestEnableBluetooth() async {
    try {
      await _bluetoothStatePlugin.requestEnableBluetooth();
    } on PlatformException {
      print("xxxx");
    }
    if (!mounted) return;
  }

  Future<void> requestDisableBluetooth() async {
    try {
      await _bluetoothStatePlugin.requestDisableBluetooth();
    } on PlatformException {
      print("xxxx");
    }
    if (!mounted) return;
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('蓝牙状态示例'),
        ),
        body: Column(
          children: [
            Center(
              child: Text('蓝牙状态'),
            ),
            SwitchListTile(
                title: Text("启用/禁用蓝牙"),
                value: _stateBluetooth,
                onChanged: (value) {
                  if (_stateBluetooth) {
                    requestDisableBluetooth();
                  } else {
                    requestEnableBluetooth();
                  }
                  setState(() {
                    _stateBluetooth = value;
                  });
                }
            ),
            Text(_stateBluetooth.toString())
          ],
        )
      ),
    );
  }
}

更多关于Flutter蓝牙状态监测插件bluetooth_state的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter蓝牙状态监测插件bluetooth_state的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


当然,下面是一个关于如何使用Flutter蓝牙状态监测插件bluetooth_state的代码示例。这个插件可以帮助你监测设备的蓝牙状态,并在状态改变时执行相应的操作。

首先,确保你已经在你的Flutter项目中添加了bluetooth_state插件。你可以在你的pubspec.yaml文件中添加以下依赖:

dependencies:
  flutter:
    sdk: flutter
  bluetooth_state: ^x.y.z  # 请使用最新版本号替换x.y.z

然后运行flutter pub get来安装依赖。

接下来,编写你的Flutter代码。以下是一个简单的示例,展示了如何使用bluetooth_state插件来监测蓝牙状态:

import 'package:flutter/material.dart';
import 'package:bluetooth_state/bluetooth_state.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Bluetooth State Monitoring',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: BluetoothStateScreen(),
    );
  }
}

class BluetoothStateScreen extends StatefulWidget {
  @override
  _BluetoothStateScreenState createState() => _BluetoothStateScreenState();
}

class _BluetoothStateScreenState extends State<BluetoothStateScreen> with WidgetsBindingObserver {
  BluetoothState? _bluetoothState;
  bool _isBluetoothEnabled = false;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance?.addObserver(this);
    initBluetoothState();
  }

  @override
  void dispose() {
    WidgetsBinding.instance?.removeObserver(this);
    BluetoothState.unsubscribe();
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed) {
      // 应用恢复时重新初始化蓝牙状态(可选)
      initBluetoothState();
    }
  }

  void initBluetoothState() async {
    // 初始化并订阅蓝牙状态变化
    BluetoothState.initialize().then((state) {
      setState(() {
        _bluetoothState = state;
        _isBluetoothEnabled = state.isEnabled;
      });
    });

    // 订阅蓝牙状态变化事件
    BluetoothState.subscribe().listen((state) {
      setState(() {
        _bluetoothState = state;
        _isBluetoothEnabled = state.isEnabled;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Bluetooth State Monitoring'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('Bluetooth State: $_bluetoothState'),
            SizedBox(height: 20),
            Text('Is Bluetooth Enabled: $_isBluetoothEnabled'),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: () async {
                if (!_isBluetoothEnabled) {
                  // 尝试打开蓝牙(注意:这可能需要用户手动确认)
                  await BluetoothState.enable();
                } else {
                  // 关闭蓝牙(注意:并非所有设备都支持通过代码关闭蓝牙)
                  // BluetoothState.disable(); // 某些设备上可能不可用
                  print('Bluetooth is already enabled.');
                }

                // 重新检查蓝牙状态
                initBluetoothState();
              },
              child: Text('Toggle Bluetooth'),
            ),
          ],
        ),
      ),
    );
  }
}

代码说明

  1. 依赖添加:确保在pubspec.yaml中添加了bluetooth_state依赖。
  2. 初始化:在initState方法中初始化蓝牙状态,并订阅蓝牙状态变化事件。
  3. 状态监听:使用BluetoothState.subscribe()方法监听蓝牙状态变化,并在状态变化时更新UI。
  4. 按钮操作:提供一个按钮来尝试打开蓝牙(注意,关闭蓝牙的操作在某些设备上可能不可用)。
  5. 生命周期管理:在didChangeAppLifecycleState方法中处理应用状态变化,确保应用在恢复时重新初始化蓝牙状态。

请注意,实际开发中可能需要处理更多的边界情况和错误处理,这里提供的代码是一个简单的示例,展示了基本的用法。

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