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 ID
- write/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}}: /text text设备名称: {{item.name}}/text textMAC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数据接收/text text{{receive_data}}/text !-- button size="mini" bindtap="receiveMessages"接收/button -- /view view class="send" form bindsubmit="formSubmit" text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/viewindex.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 = this that.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.available if (!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 = this if (!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;i100;i++){ if (res.devices[i]) { string_temp = string_temp + '' + 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 = this wx.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 = this let 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) { } }) },})
