最近做的微信小程序要调用手机自带的4.0蓝牙发送、接收数据
4.0蓝牙又叫BLE，整理了下，蓝牙连接要经过如下步骤：
初始化蓝牙检查蓝牙是否初始化成功开始搜索附近蓝牙设备显示扫描得到的蓝牙选择连接特定MAC地址的蓝牙设备连接成功后，获取service ID然后获取characteristic IDwrite/read data
*每个步骤对应的操作在js代码中有注释
我遇到的坑：一定要启用notify功能，否则只能发送，无法接收数据！！！
index.json为空，只上传了index.wxml，index.wxss，index.js三个文件，源码如下
index.wxml
<!--pages/mine/mine.wxml--><view class="container"><view class="section"> <!-- 第一行 --><view class="content"><text>蓝牙开关</text></view><view class="switch"><switch checked="{{isbluetoothready}}" bindchange="open_BLE" /></view></view><view class="section"> <!-- 第二行 --><button type="default" size="{{primarySize}}" loading="{{searchingstatus}}" plain="{{plain}}" disabled="{{disabled}}" bindtap="search_BLE"> {{searchingstatus?"搜索中":"搜索蓝牙"}} </button></view><block wx:for="{{list}}"><!-- 第三行 --><view class="section" style="flex-direction:row" ><view><text>{{index}}:\n </text><text>设备名称: {{item.name}}\n</text><text>MAC地址: {{item.deviceId}}</text></view><view class="connection"><button id="{{item.deviceId}}" size="mini"bindtap="connectTO"> {{deviceconnected?"已连接":"连接"}} </button></view></view></block> <block wx:if="{{deviceconnected}}"> <!-- 第四行 --><view ><text>\n\n数据接收\n</text><text>{{receive_data}}\n</text><!-- <button size="mini" bindtap="receiveMessages">接收</button> --></view><view class="send"><form bindsubmit="formSubmit"><text>\n\n数据发送:</text><input name="senddata"/><button size="mini" formType="submit">发送</button><button size="mini" formType="reset">清空</button></form></view></block></view>
index.wxss
view {display: inline-block;}.container {padding: 0;margin: 0;align-items: flex-start;}.section {display: inline-block;width: 100%;margin-top: 50rpx;position: relative;}.connection {margin-left: 90rpx;}.list {margin-left: 20rpx;}.content {margin-left: 100rpx;padding: auto;position: absolute;top: 5rpx;left: 10rpx;}.switch {position: relative;float: right;margin-right: 100rpx;}button {background: red\;}.list-item {margin-top: 20rpx;margin-bottom: 20rpx; display: flex;flex-direction: column;box-sizing: border-box;border: 1px dashed #000;}.list-item text {margin-top: 10rpx;}.list-item button {margin-right: 10rpx;}.deviceconnected{background-color:sandybrown}.recieve{width: 100%}.recieve_textarea{width: 100%;margin-top: 10dpx;}input{display: block;border: 1px dashed;width: 200px;}
index.js
var app = getApp()var temp = []var string_temp=""var serviceId = "0000ffe0-0000-1000-8000-00805f9b34fb"var characteristicId = "0000ffe1-0000-1000-8000-00805f9b34fb"Page({data: {isbluetoothready: false,defaultSize: 'default',primarySize: 'default',warnSize: 'default',disabled: false,plain: false,loading: false,searchingstatus: false,receivedata: '666',onreceiving: false,id_text: string_temp,list: [],receive_data:'none '},onLoad: function () {},open_BLE: function () {var that = thisthat.setData({isbluetoothready: !that.data.isbluetoothready,})if (that.data.isbluetoothready) {//开启蓝牙模块并初始化wx.openBluetoothAdapter({success: function (res) {},fail: function (res) {wx.showModal({title: '提示',content: '请检查手机蓝牙是否打开',})}})//开启蓝牙模块并初始化//检查蓝牙模块是否初始化成功wx.getBluetoothAdapterState({success: function (res) {var available = res.availableif (!available) {wx.showToast({title: '蓝牙初始化失败',icon: 'loading',duration: 2000})}else {wx.showToast({title: '蓝牙初始化成功',icon: 'success',duration: 2000})}}})//检查蓝牙模块是否初始化成功}else{wx.closeBLEConnection({deviceId: that.data.connectedDeviceId,complete: function (res) {that.setData({deviceconnected: false,connectedDeviceId: ""})wx.showToast({title: '蓝牙连接断开',icon: 'success',duration: 2000})}})setTimeout(function () {that.setData({list: []})//释放蓝牙适配器wx.closeBluetoothAdapter({success: function (res) {that.setData({isbluetoothready: false,deviceconnected: false,devices: [],searchingstatus: false,receivedata: ''})wx.showToast({title: '蓝牙适配器释放',icon: 'success',duration: 2000})},fail: function (res) {}})//释放蓝牙适配器}, 1000)}},search_BLE: function () {temp = []var that = thisif (!that.data.searchingstatus) {var that = this//开始搜索附近蓝牙设备wx.startBluetoothDevicesDiscovery({success: function (res) {wx.showToast({title: '开始搜索BLE',icon: 'loading',duration: 2000})that.setData({searchingstatus: !that.data.searchingstatus})}})//开始搜索附近蓝牙设备} else {//停止搜索附近蓝牙设备wx.stopBluetoothDevicesDiscovery({success: function (res) {wx.showToast({title: '停止搜索BLE',icon: 'success',duration: 2000})that.setData({searchingstatus: !that.data.searchingstatus})}})//停止搜索附近蓝牙设备setTimeout(function () {//获取发现的蓝牙设备wx.getBluetoothDevices({success: function (res) {for(var i=0;i<100;i++){if (res.devices[i]) {string_temp = string_temp + '\n' + res.devices[i].deviceId}}that.setData({id_text: string_temp,list: res.devices})}})//获取发现的蓝牙设备}, 1000)}},connectTO: function (e) {var that = thiswx.showLoading({title: '连接蓝牙设备中...',})wx.createBLEConnection({deviceId: e.currentTarget.id,success: function (res) {wx.hideLoading()wx.showToast({title: '连接成功',icon: 'success',duration: 1000})that.setData({deviceconnected: true,connectedDeviceId: e.currentTarget.id})// 启用 notify 功能wx.notifyBLECharacteristicValueChanged({state: true, deviceId: that.data.connectedDeviceId,serviceId: serviceId,characteristicId: characteristicId,success: function (res) {}})// 启用 notify 功能// ArrayBuffer转为16进制数function ab2hex(buffer) {var hexArr = Array.prototype.map.call(new Uint8Array(buffer),function (bit) {return ('00' + bit.toString(16)).slice(-2)})return hexArr.join('');}// 16进制数转ASCLL码function hexCharCodeToStr(hexCharCodeStr) {var trimedStr = hexCharCodeStr.trim();var rawStr = trimedStr.substr(0, 2).toLowerCase() === "0x" ? trimedStr.substr(2) : trimedStr;var len = rawStr.length;var curCharCode;var resultStr = [];for (var i = 0; i < len; i = i + 2) {curCharCode = parseInt(rawStr.substr(i, 2), 16);resultStr.push(String.fromCharCode(curCharCode));}return resultStr.join("");}//监听回调，接收数据wx.onBLECharacteristicValueChange(function (characteristic) {var hex = ab2hex(characteristic.value)that.setData({receive_data: hexCharCodeToStr(hex)})})},fail: function (res) {wx.hideLoading()wx.showToast({title: '连接设备失败',icon: 'success',duration: 1000})that.setData({connected: false})}})wx.stopBluetoothDevicesDiscovery({success: function (res) {}})},formSubmit: function (e) {var senddata = e.detail.value.senddata;var that = thislet buffer = new ArrayBuffer(senddata.length)let dataView = new DataView(buffer)for (var i = 0; i < senddata.length; i++) {dataView.setUint8(i, senddata.charAt(i).charCodeAt())}wx.writeBLECharacteristicValue({deviceId: that.data.connectedDeviceId,serviceId: serviceId,characteristicId: characteristicId,value: buffer,success: function (res) {wx.showToast({title: '发送成功',icon: 'success',duration: 2000})}})},receiveMessages: function () {var that = this;wx.readBLECharacteristicValue({deviceId: that.data.connectedDeviceId,serviceId: serviceId,characteristicId: characteristicId,success: function (res) {}})},})
