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/**
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* 蓝牙多设备管理模块（Android 优化版）
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* 功能：
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* - 统一初始化蓝牙适配器
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* - 扫描设备（可指定服务 UUID）
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* - 直接连接已知设备（通过 deviceId/MAC）
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* - 管理多个设备（打印机、电子秤等）
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* - 写入数据、接收数据、连接状态监听
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* - 自动重连（可选）
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*
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* 使用方法：
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* import bluetoothManager from '@/utils/BluetoothManager.js';
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* await bluetoothManager.init();
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* bluetoothManager.setDeviceFoundCallback(...);
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* await bluetoothManager.connectKnownDevice(deviceId, serviceUUID, writeUUID);
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*/
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class BluetoothManager {
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constructor() {
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this.adapterOpen = false; // 蓝牙适配器是否已打开
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this.discovering = false; // 是否正在扫描
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this.devices = new Map(); // 存储已连接设备的信息：key=deviceId, value={ serviceId, writeCharId, notifyCharId, name }
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// 全局回调（只注册一次）
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this.globalListeners = {
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onDeviceFound: null,
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onConnectionChange: null,
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onDataReceived: null,
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};
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}
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/**
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* 初始化蓝牙适配器（全局只需调用一次）
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* @returns {Promise<void>}
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*/
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async init() {
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if (this.adapterOpen) return;
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return new Promise((resolve, reject) => {
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uni.openBluetoothAdapter({
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success: () => {
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this.adapterOpen = true;
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this._registerGlobalListeners();
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resolve();
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},
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fail: (err) => {
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console.error('蓝牙初始化失败', err);
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reject(err);
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},
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});
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});
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}
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/**
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* 注册全局唯一的监听器（避免覆盖）
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*/
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_registerGlobalListeners() {
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// 设备发现监听
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uni.onBluetoothDeviceFound((res) => {
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const { devices } = res;
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if (this.globalListeners.onDeviceFound) {
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devices.forEach(device => this.globalListeners.onDeviceFound(device));
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}
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});
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// 连接状态变化监听
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uni.onBLEConnectionStateChange((res) => {
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const { deviceId, connected } = res;
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if (this.globalListeners.onConnectionChange) {
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this.globalListeners.onConnectionChange(deviceId, connected);
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}
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// 如果连接断开，从 devices Map 中移除（可选，保留以便重连）
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if (!connected && this.devices.has(deviceId)) {
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// 注意：不断开 Map 中的记录，因为可能用于重连；但可以标记一个状态
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// 这里不做自动删除，由业务层决定是否移除
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}
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});
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// 特征值数据接收监听
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uni.onBLECharacteristicValueChange((res) => {
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const { deviceId, value } = res;
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if (this.globalListeners.onDataReceived) {
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this.globalListeners.onDataReceived(deviceId, value);
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}
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});
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}
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/**
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* 设置设备发现回调
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* @param {Function} callback (device) => {}
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*/
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setDeviceFoundCallback(callback) {
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this.globalListeners.onDeviceFound = callback;
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}
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/**
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* 设置连接状态变化回调
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* @param {Function} callback (deviceId, connected) => {}
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*/
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setConnectionChangeCallback(callback) {
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this.globalListeners.onConnectionChange = callback;
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}
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/**
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* 设置数据接收回调
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* @param {Function} callback (deviceId, arrayBuffer) => {}
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*/
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setDataReceivedCallback(callback) {
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this.globalListeners.onDataReceived = callback;
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}
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/**
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* 开始扫描设备
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* @param {Array} services 要过滤的服务 UUID 数组（可选）
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* @returns {Promise}
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*/
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async startScan(services = []) {
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if (!this.adapterOpen) {
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throw new Error('蓝牙未初始化，请先调用 init()');
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}
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if (this.discovering) {
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await this.stopScan();
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}
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return new Promise((resolve, reject) => {
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uni.startBluetoothDevicesDiscovery({
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services,
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success: () => {
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this.discovering = true;
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resolve();
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},
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fail: reject,
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});
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});
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}
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/**
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* 停止扫描
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*/
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stopScan() {
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if (!this.discovering) return Promise.resolve();
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return new Promise((resolve, reject) => {
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uni.stopBluetoothDevicesDiscovery({
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success: () => {
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this.discovering = false;
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resolve();
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},
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fail: reject,
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});
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});
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}
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/**
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* 直接连接已知设备（不依赖扫描结果）
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* @param {string} deviceId 设备 MAC 地址（Android）
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* @param {string} targetServiceUUID 目标服务的 UUID
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* @param {string} writeUUID 写入特征值 UUID（可选，自动查找第一个可写）
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* @param {string} notifyUUID 通知特征值 UUID（可选，自动查找第一个可通知）
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* @returns {Promise<object>} 返回设备信息 { deviceId, serviceId, writeCharId, notifyCharId }
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*/
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async connectKnownDevice(deviceId, targetServiceUUID, writeUUID = null, notifyUUID = null) {
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if (!this.adapterOpen) {
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throw new Error('蓝牙未初始化，请先调用 init()');
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}
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// 如果已经连接且 Map 中有记录，直接返回（可选，但为了避免重复连接，先断开）
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if (this.devices.has(deviceId)) {
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await this.disconnectDevice(deviceId);
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}
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return new Promise((resolve, reject) => {
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uni.createBLEConnection({
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deviceId,
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success: async () => {
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// 等待服务发现稳定（重要：解决连接成功但查不到服务的问题）
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await this._delay(800);
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try {
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// 1. 获取服务列表
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const { services } = await this._getBLEDeviceServices(deviceId);
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const targetService = services.find(s => s.uuid.toLowerCase().includes(targetServiceUUID.toLowerCase()));
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if (!targetService) {
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throw new Error(`未找到服务 ${targetServiceUUID}`);
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}
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// 2. 获取特征值
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const characteristics = await this._getBLEDeviceCharacteristics(deviceId, targetService.uuid);
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let writeChar = null;
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if (writeUUID) {
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writeChar = characteristics.find(c => c.uuid.toLowerCase() === writeUUID.toLowerCase());
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} else {
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writeChar = characteristics.find(c => c.properties.write || c.properties.writeNoResponse);
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}
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if (!writeChar) {
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throw new Error('未找到可写入的特征值');
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}
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let notifyChar = null;
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if (notifyUUID) {
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notifyChar = characteristics.find(c => c.uuid.toLowerCase() === notifyUUID.toLowerCase());
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} else {
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notifyChar = characteristics.find(c => c.properties.notify || c.properties.indicate);
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}
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// 3. 启用通知（如果有 notify 特征值）
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if (notifyChar && (notifyChar.properties.notify || notifyChar.properties.indicate)) {
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await this._notifyBLECharacteristicValueChange(deviceId, targetService.uuid, notifyChar.uuid, true);
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}
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// 4. 存储设备信息
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this.devices.set(deviceId, {
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serviceId: targetService.uuid,
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writeCharId: writeChar.uuid,
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notifyCharId: notifyChar ? notifyChar.uuid : null,
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});
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resolve({
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deviceId,
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serviceId: targetService.uuid,
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writeCharId: writeChar.uuid,
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notifyCharId: notifyChar ? notifyChar.uuid : null,
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});
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} catch (err) {
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reject(err);
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}
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},
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fail: reject,
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});
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});
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}
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/**
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* 向指定设备写入数据
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* @param {string} deviceId
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* @param {ArrayBuffer} buffer
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* @returns {Promise}
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*/
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async writeData(deviceId, buffer) {
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const device = this.devices.get(deviceId);
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if (!device) {
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throw new Error('设备未连接或未初始化，请先调用 connectKnownDevice');
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}
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return new Promise((resolve, reject) => {
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uni.writeBLECharacteristicValue({
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deviceId,
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serviceId: device.serviceId,
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characteristicId: device.writeCharId,
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value: buffer,
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success: resolve,
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fail: reject,
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});
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});
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}
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/**
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* 断开指定设备
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* @param {string} deviceId
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* @returns {Promise}
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*/
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disconnectDevice(deviceId) {
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if (!this.devices.has(deviceId)) return Promise.resolve();
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return new Promise((resolve, reject) => {
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uni.closeBLEConnection({
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deviceId,
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success: () => {
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this.devices.delete(deviceId);
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resolve();
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},
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fail: reject,
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});
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});
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}
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/**
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* 断开所有已连接设备并关闭蓝牙适配器
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*/
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async closeAll() {
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const disconnectPromises = Array.from(this.devices.keys()).map(id => this.disconnectDevice(id));
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await Promise.all(disconnectPromises);
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if (this.adapterOpen) {
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return new Promise((resolve) => {
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uni.closeBluetoothAdapter({
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success: () => {
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this.adapterOpen = false;
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this.discovering = false;
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resolve();
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},
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fail: () => {
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this.adapterOpen = false;
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resolve();
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},
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});
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});
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}
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}
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// ---------- 内部辅助方法 ----------
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_delay(ms) {
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return new Promise(resolve => setTimeout(resolve, ms));
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}
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_getBLEDeviceServices(deviceId) {
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return new Promise((resolve, reject) => {
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uni.getBLEDeviceServices({
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deviceId,
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success: resolve,
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fail: reject,
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});
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});
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}
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_getBLEDeviceCharacteristics(deviceId, serviceId) {
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return new Promise((resolve, reject) => {
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uni.getBLEDeviceCharacteristics({
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deviceId,
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serviceId,
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success: resolve,
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fail: reject,
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});
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});
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}
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_notifyBLECharacteristicValueChange(deviceId, serviceId, characteristicId, state = true) {
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return new Promise((resolve, reject) => {
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uni.notifyBLECharacteristicValueChange({
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deviceId,
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serviceId,
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characteristicId,
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state,
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success: resolve,
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fail: reject,
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});
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});
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}
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/**
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* 仅连接设备并获取服务列表（不预设任何特征值）
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* 用于设备配置阶段，让用户手动选择服务和特征值
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* @param {string} deviceId
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* @returns {Promise<{services: Array}>} 返回服务列表
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*/
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async connectForDiscovery(deviceId) {
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if (!this.adapterOpen) {
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throw new Error('蓝牙未初始化');
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}
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// 如果已连接，先断开
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if (this.devices.has(deviceId)) {
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await this.disconnectDevice(deviceId);
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}
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return new Promise((resolve, reject) => {
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uni.createBLEConnection({
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deviceId,
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success: async () => {
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await this._delay(800);
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try {
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const { services } = await this._getBLEDeviceServices(deviceId);
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// 暂不存储到 devices Map，因为还没确定特征值
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resolve({ services, deviceId });
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} catch (err) {
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reject(err);
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}
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},
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fail: reject,
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});
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});
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}
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/**
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* 保存用户选择的配置，并完成最终连接（启用通知等）
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* @param {string} deviceId
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* @param {string} serviceId
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* @param {string} writeCharId
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* @param {string} notifyCharId (可选)
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* @returns {Promise}
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*/
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async saveAndConnect(deviceId, serviceId, writeCharId, notifyCharId = null) {
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if (!this.adapterOpen) {
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throw new Error('蓝牙未初始化');
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}
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// 启用通知（如果需要）
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if (notifyCharId) {
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await this._notifyBLECharacteristicValueChange(deviceId, serviceId, notifyCharId, true);
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}
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// 存储设备信息
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this.devices.set(deviceId, {
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serviceId: serviceId,
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writeCharId: writeCharId,
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notifyCharId: notifyCharId,
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});
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return { deviceId, serviceId, writeCharId, notifyCharId };
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}
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}
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export default new BluetoothManager();
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