微信小程序连接蓝牙工具类支持IOS和安卓

// 初始化蓝牙(判断用户有没有开蓝牙) --> 搜索蓝牙 --> 连接蓝牙 --> 根据连接的deviceId获取服务serviceUUID -->
// 根据服务serviceUUID获取特征值 --> 根据特征值获取 读写权限 --> 根据读写 数据交互
var test  = 'FE08010000000000000108';
var ble={
    //适配器开启状态
    openBluetoothAdapter:false,
    //蓝牙是否可用
    available:false,
    //服务发现是否开启
    discovering:false,
    //发现的设备列表
    deviceList:[],
    //当前连接设备id
    connectingDeviceId:'',
    //服务uuid
    services_UUID:'',
    //特征值uuid
    characteristic_UUID:'',
}
//蓝牙方法
// 初始化蓝牙
ble.openEvent = () => {
    wx.getLocation({
        type: 'gcj02', //返回可以用于wx.openLocation的经纬度
        success: function (res) {
            // let latitude = res.latitude //维度
            // let longitude = res.longitude //经度
            console.log(res);
        }
    });
    openBluetooth();
}
// 搜索蓝牙
ble.searchEvent = () => {
    if (ble.discovering){
        toast('正在搜索');
        return;
    }
    ble.deviceList= []
    // 停止搜寻附近的蓝牙外围设备
    stopDiscovery();
    // 获取本机蓝牙适配器状态
    if(getBluetoothState()){
        return;
    }
    // 监听蓝牙适配器状态变化事件
    onBluetoothStateChange();
    // 开始搜寻附近的蓝牙外\围设备
    startDiscovery();
    // 监听寻找到新设备
    onFoundBluetooth();
}
// 连接设备
ble.connectEvent = function(deviceId, successCallback,errorCallback){
    if(this.data.connected){
        return;
    }
    // 停止搜寻附近的蓝牙外围设备
    stopDiscovery();
    // 断开与低功耗蓝牙设备的连接 然后再连接新的设备
    closeConnection(deviceId);
    // 连接低功耗蓝牙设备
    BLEConnection(deviceId);
}
//蓝牙发送数据
ble.sendMsg = function(msg, successCallback,errorCallback){
    this.writeToBluetoothValue(ble.connectingDeviceId,ble.services_UUID,ble.characteristic_UUID,msg,successCallback,errorCallback);
}
//=========================================
//依赖方法
// 初始化蓝牙模块
function openBluetooth(){
    wx.openBluetoothAdapter({
        success(e){
            if (e.errMsg == 'openBluetoothAdapter:ok'){
                ble.openBluetoothAdapter = true;
                getBluetoothState();
            }
        },
        fail(){
            wx.showModal({
                title: '温馨提示',
                content: '请检查手机蓝牙是否开启',
                showCancel:false
            });
            ble.openBluetoothAdapter = false;
        },
    })
}
// 获取本机蓝牙适配器状态
function getBluetoothState(){
    wx.getBluetoothAdapterState({
        success(e){
            ble.available=e.available
            ble.discovering=e.discovering
            return true;
        },
        fail(){
            ble.available=false
            ble.discovering=false
            return false;
        }
    });
}
// 停止搜寻附近的蓝牙外围设备
function stopDiscovery(){
    wx.stopBluetoothDevicesDiscovery({
        success(res){
            console.log('停止搜寻附近的蓝牙外围设备');
            console.log(res);
            ble.discovering = false
        },
        fail(){
            toast('停止搜索失败');
        },
    });
}
// 监听蓝牙适配器状态变化事件
function onBluetoothStateChange(){
    wx.onBluetoothAdapterStateChange(function(res){
        ble.available = res.available
        ble.discovering = res.discovering
    });
}
// 开始搜寻附近的蓝牙外围设备
function startDiscovery(){
    console.log('开始搜索设备');
    wx.startBluetoothDevicesDiscovery({
        success (res) {
            ble.discovering = res.isDiscovering
            // that.getDevices();
        },
        fail(){
            ble.discovering = false
            toast('搜索失败');
        }
    })
}
// 监听寻找到新设备的事件
function onFoundBluetooth(){
    wx.onBluetoothDeviceFound(function (res) {
        // that.getDevices();
        // 兼容安卓及iOS设备
        if(res.deviceId){
            that.devicesData(res);
        } else if(res.devices){
            that.devicesData(res.devices[0]);
        } else if(res[0]){
            that.devicesData(res[0]);
        }
    });
}
// 获取在蓝牙模块生效期间所有已发现的蓝牙设备，包括已经和本机处于连接状态的设备
function getDevices(){
    wx.getBluetoothDevices({
        success: function (res) {
            console.log('获取在蓝牙模块生效期间所有已发现的蓝牙设备，包括已经和本机处于连接状态的设备');
            console.log(res);
            ble.deviceList = res.devices;
        }
    })
}
// 断开与低功耗蓝牙设备的连接
function closeConnection(){
    let connectingDeviceId = ble.connectingDeviceId;
    if(!connectingDeviceId){
        return;
    }
    wx.closeBLEConnection({
        deviceId: connectingDeviceId,
        success(res){
            console.log('断开与低功耗蓝牙设备的连接');
            console.log(res);
        },
        fail(){
            toast('断开连接失败');
        }
    });
}
// 连接低功耗蓝牙设备
function BLEConnection(deviceId){
    loading('连接中');
    console.log('连接中...');
    console.log(deviceId);
    wx.createBLEConnection({
        deviceId: deviceId,
        timeout: 60000,
        success(res){
            console.log('连接成功');
            console.log(res);
            // connectingDeviceId = deviceId;
            ble.connected = true;
            ble.connectingDeviceId = deviceId
            getServices(deviceId);
            hide_Loading();
            toast('连接成功');
        },
        fail(res){
            console.log('连接失败');
            console.log(res);
            ble.connected = false;
            hide_Loading();
        },
    });
}
// 获取蓝牙设备所有服务(service) 为了获取service的UUID
function getServices(deviceId){
    // console.log(deviceId);
    wx.getBLEDeviceServices({
        deviceId:deviceId,
        success(res){
            // console.log('获取蓝牙设备service');
            console.log(res);
            ble.services = res.services
            let uuid = res.services;
            let len = uuid.length;
            for(let i = 0; i < len; i++){
                // if (res.services[i].isPrimary) {
                getCharacteristics(deviceId,res.services[i].uuid);
            }
        },
        fail(res){
            toast('获取服务失败');
            console.log(res);
        },
    });
}
// 获取蓝牙设备某个服务中所有特征值(characteristic) 为了该特征值UUID支持的操作类型
function getCharacteristics(deviceId,servicesId){
    wx.getBLEDeviceCharacteristics({
        deviceId:deviceId,
        serviceId:servicesId,
        success(res){
            console.log('获取蓝牙设备characteristic');
            console.log(res);
            if(res.errCode === 0){
                let characteristics = res.characteristics;
                let len = characteristics.length;
                for(let k = 0; k < len; k++){
                    let indicate = characteristics[k].properties.indicate;
                    let notify = characteristics[k].properties.notify;
                    let read = characteristics[k].properties.read;
                    let write = characteristics[k].properties.write;
                    console.log(indicate,notify,read,write);
                    if(indicate && notify && read && write){
                        // let connectingDeviceId = res.deviceId;
                        let connectingDeviceId = deviceId;
                        console.log('connectingDeviceId');
                        console.log(connectingDeviceId);
                        // let services_UUID = res.serviceId;
                        let services_UUID = servicesId;
                        console.log('services_UUID');
                        console.log(services_UUID);
                        let characteristic_UUID = characteristics[k].uuid;
                        console.log('characteristic_UUID');
                        console.log(characteristic_UUID);
                        ble.connectingDeviceId = connectingDeviceId;
                        ble.services_UUID = services_UUID
                        ble.characteristic_UUID = characteristic_UUID
                        notifyValueChange(connectingDeviceId,services_UUID,characteristic_UUID);
                    }
                }
            }
        },
        fail(){
            toast('获取特征值失败');
        }
    });
}
// 启用低功耗蓝牙设备特征值变化时的 notify 功能，订阅特征值
function notifyValueChange(deviceId,services_UUID,characteristic_UUID){
    wx.notifyBLECharacteristicValueChange({
        deviceId:deviceId,
        serviceId:services_UUID,
        characteristicId:characteristic_UUID,
        state:true,
        success(res){
            console.log('启用低功耗蓝牙设备特征值变化时的 notify 功能，订阅特征值: 成功---');
            console.log(res);
            onValueChange();
            // setTimeout(function () {
            //     let connectingDeviceId = that.data.connectingDeviceId;
            //     let services_UUID = that.data.services_UUID;
            //     let characteristic_UUID = that.data.characteristic_UUID;
            //     writeToBluetoothValue(connectingDeviceId,services_UUID,characteristic_UUID,test);
            // },1000);
        },
        fail(res){
            console.log('启用低功耗蓝牙设备特征值变化时的 notify 功能，订阅特征值: 失败---');
            console.log(res);
        },
    });
}
// 监听低功耗蓝牙设备的特征值变化
// 必须先启用 notifyBLECharacteristicValueChange 接口才能接收到设备推送的 notification。
function onValueChange(){
    wx.onBLECharacteristicValueChange(function(res){
        console.log('监听低功耗蓝牙设备的特征值变化');
        console.log(res);
        console.log(ab2hex(res.value));
        // 获取设备返回的数据
        let hex = ab2hex(res.value);
        // 获取总次数
        let num = hexSlice(hex);
        console.log(num)
        ble.shakeNum = num
    });
}
// 蓝牙写数据
function writeToBluetoothValue(deviceId,services_UUID,characteristic_UUID,buffer,successCallback,errorCallback){
    let value = hex2ab(buffer);
    wx.writeBLECharacteristicValue({
        deviceId:deviceId,
        serviceId:services_UUID,
        characteristicId:characteristic_UUID,
        value:value,
        success(res){
            console.log('向低功耗蓝牙设备特征值中写入二进制数据: 成功---');
            console.log(res);
            successCallback(res)
        },
        fail(res){
            console.log('向低功耗蓝牙设备特征值中写入二进制数据: 失败---');
            console.log(res);
            errorCallback(res)
        }
    })
}
// 读取低功耗蓝牙设备的特征值的二进制数据值
// 接口读取到的信息需要在 onBLECharacteristicValueChange 方法注册的回调中获取
function readValue(){
    let connectingDeviceId = this.data.connectingDeviceId;
    let services_UUID = this.data.services_UUID;
    let characteristic_UUID = this.data.characteristic_UUID;
    wx.readBLECharacteristicValue({
        deviceId:connectingDeviceId,
        serviceId:services_UUID,
        characteristicId:characteristic_UUID,
        success(res){
            console.log('读取低功耗蓝牙设备的特征值的二进制数据值: 成功---');
            console.log(res);
        },
        fail(res){
            console.log('读取低功耗蓝牙设备的特征值的二进制数据值: 失败---');
            console.log(res);
        }
    });
}
//=========================================
//工具函数
// ArrayBuffer转16进度字符串示例
function ab2hex(buffer) {
    let hexArr = Array.prototype.map.call(
        new Uint8Array(buffer),
        function (bit) {
            return ('00' + bit.toString(16)).slice(-2);
        }
    );
    return hexArr.join('');
}
/**
 * 16进制字符串转ArrayBuffer
 */
function hex2ab(str) {
    if (!str) {
        return new ArrayBuffer(0);
    }
    let typedArray = new Uint8Array(str.match(/[\da-f]{2}/gi).map(function (h) {
        return parseInt(h, 16)
    }));
    let buffer1 = typedArray.buffer;
    console.log(buffer1);
    return buffer1;
}
// 16进制字符串取需要的字节(fe 08 01 00 01 01 01 7a0b 008f)
function hexSlice(hex) {
    // 取k8位
    let k8 = hex.slice(14,16);
    //取k9位
    let k9 = hex.slice(16,18);
    return parseInt(k9+k8,16);
}
function toast(title) {
    wx.showToast({
        title: title,
        icon:'none',
        duration:1500,
        success(){
            setTimeout(()=>{
                wx.hideToast();
            },2000);
        }
    });
}
function loading(title) {
    wx.showLoading({
        title:title,
        mask:true,
    });
}
function hide_Loading() {
    wx.hideLoading();
}
//拼接新的device
function devicesData(new_devices){
    let deviceList = ble.deviceList;
    let len = deviceList.length;
    let isExist = false;
    console.log(new_devices);
    if(!new_devices.name){
        new_devices.name = '空';
        return;
    }
    let advertisData = ab2hex(new_devices.advertisData);
    if(!advertisData){
        advertisData = '空';
    }
    new_devices.advertisData = advertisData;
    for(let i = 0; i < len; i++){
        if(new_devices.deviceId == deviceList[i].deviceId){
            isExist = true;
            deviceList.splice(i,1,new_devices);
        }
    }
    if(!isExist){
        deviceList.push(new_devices);
    }
    ble.deviceList = deviceList
}