Flutter蓝牙管理插件 bluetooth_manager 的使用

bluetooth_manager 是一个用于控制蓝牙基本功能的 Android 插件，可以用来打开/关闭蓝牙并获取蓝牙状态。

如何开始

首先需要导入库：

import 'package:bluetooth_manager/bluetooth_manager.dart';

使用示例

示例：获取蓝牙状态

// 获取蓝牙状态
// 返回 BluetoothState 类型
// 可能的状态有 on, off 和 unknow
BluetoothState bluetoothState = await bluetoothManager.getBluetoothState();
print(bluetoothState);

示例：监听蓝牙状态变化

// 监听蓝牙状态变化
// 返回 BluetoothState 类型
// 可能的状态有 on, off 和 unknow
bluetoothManager.getBluetoothStateStream().listen((BluetoothState bluetoothState) {
    print(bluetoothState);
    // 在此处执行你的逻辑...
});

示例：打开/关闭蓝牙

// 打开蓝牙
ActionResponse actionResponse = await bluetoothManager.enableBluetooth();
print(actionResponse);

// 关闭蓝牙
actionResponse = await bluetoothManager.disableBluetooth();
print(actionResponse);

完整示例 Demo

下面是一个完整的 Flutter 应用程序示例，展示了如何使用 bluetooth_manager 插件来管理蓝牙设备的状态。

// ignore_for_file: avoid_print

import 'dart:async';

import 'package:bluetooth_manager/models/bluetooth_models.dart';
import 'package:flutter/material.dart';

import 'package:bluetooth_manager/bluetooth_manager.dart';
import 'package:permission_handler/permission_handler.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> {
  BluetoothManager bluetoothManager = BluetoothManager();

  late BluetoothState _bluetoothState = BluetoothState.uknow;

  StreamSubscription<BluetoothState>? subscription;
  bool isListenerOn = false;

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

  setBluetoothPermission() async {
    print(await Permission.bluetooth.request().isGranted);
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          child: Column(
            children: [
              const SizedBox(height: 20),
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const Text(
                    'Bluetooth State: ',
                    style: TextStyle(fontSize: 24),
                  ),
                  Text(
                    _bluetoothState.toString().split('.').last,
                    style: TextStyle(
                      fontSize: 24,
                      color: _bluetoothState == BluetoothState.on
                          ? Colors.green
                          : _bluetoothState == BluetoothState.off
                              ? Colors.red
                              : Colors.grey,
                    ),
                  )
                ],
              ),
              const SizedBox(height: 50),
              ElevatedButton(
                onPressed: () async {
                  /// 如果监听器已启用，则取消它，并获取当前蓝牙状态
                  if (subscription != null) {
                    setState(() {
                      isListenerOn = false;
                    });
                    subscription!.cancel();
                  }

                  /// 获取蓝牙状态
                  /// 并将 [BluetoothState] 设置为本地变量 _bluetoothState
                  BluetoothState bluetoothState =
                      await bluetoothManager.getBluetoothState();
                  setState(() {
                    _bluetoothState = bluetoothState;
                  });
                },
                child: const Text('Get bluetooth State'),
              ),
              const SizedBox(height: 50),
              Text(
                isListenerOn ? 'Listener On' : 'Listener Off',
                style: const TextStyle(fontSize: 16),
              ),
              ElevatedButton(
                onPressed: () async {
                  /// 监听蓝牙状态变化
                  /// 并将 [BluetoothState] 设置为本地变量 _bluetoothState
                  /// 不要忘记在不再使用时取消监听
                  setState(() {
                    isListenerOn = true;
                  });
                  subscription = bluetoothManager
                      .getBluetoothStateStream(timer: 500)
                      .listen((BluetoothState bluetoothState) {
                    setState(() {
                      _bluetoothState = bluetoothState;
                    });
                  });
                },
                child: const Text('Listen/Pause bluetooth State'),
              ),
              const SizedBox(height: 50),
              ElevatedButton(
                onPressed: () async {
                  /// 验证蓝牙状态
                  if (_bluetoothState == BluetoothState.on) {
                    /// 如果蓝牙已开启，则关闭蓝牙
                    ActionResponse actionResponse =
                        await bluetoothManager.disableBluetooth();
                    print(actionResponse);
                  } else {
                    /// 如果蓝牙已关闭，则打开蓝牙
                    ActionResponse actionResponse =
                        await bluetoothManager.enableBluetooth();
                    print(actionResponse);
                  }
                },
                child: const Text('Turn on/off'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}