前言

目前公司Vue H5项目，用webview打包成APP，现产品提出这样打包出来的app运行较慢，需要用uniapp方式（即使用HBuilder编辑器来打包H5）来打包，那需要的基座就不是安卓的基座而是uniapp的基座，而H5项目实现手机扫描功能就需要调用uniapp的基座的方法。

需求&流程说明

Vue2 开发的移动端项目（H5项目及ipad端项目），需要连接蓝牙设备打印

需求说明：

1、点击打印按钮时，先判断当前设备是否已连接过蓝牙（即是否存在蓝牙设备ID）

a、若已连接过：直接调用打印配置（即：type:bluetoothPrint）
b、若未连接过：

1、先获取当前设备的所有蓝牙list(即：type:getBluetoothList)

2、选中设备后调用蓝牙连接（即：type:connBluetooth）
3、连接成功后存储已连接的设备ID（即选中的设备）

具体步骤

一、Uniapp Webview 源码

<template>
  <view>
    <web-view :src="src" @message="showMessage"></web-view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      src: 'http://******/', // H5项目地址
      qrCodeWv: null,
      devices: [],
      currDev: null,
      connId: '',
    }
  },
  onReady() {
    // #ifdef APP-PLUS
    let currentWebview = this.$scope.$getAppWebview()
    setTimeout(() => {
      this.wv = currentWebview.children()[0]
      this.qrCodeWv = currentWebview.children()[0]
      this.wv.setStyle({ scalable: true })
    }, 1000)
    // #endif
  },
  methods: {
    showMessage(event) {
      if (event.detail.data && event.detail.data.length > 0) {
        let dataInfo = event.detail.data[0]
        console.log(dataInfo)
        let type = dataInfo.type
        if (type === 'getBluetoothList') {
          this.getBluetoothList()
        }
        if (type === 'connBluetooth') {
          console.log(dataInfo.params)
          let args = dataInfo.params;
          let deviceId = args.deviceId;
          let device = this.devices.find((item) => {
            return item.deviceId == deviceId;
          })
          console.log(device)
          this.connBluetooth(device)
        }
        if (type === 'bluetoothPrint') {
          let args = dataInfo.params;
          let deviceId = args.deviceId;
          let command = args.command;
          let device = this.devices.find((item) => {
            return item.deviceId == deviceId;
          })
          //当设备没有连接时需要重新连接设备
          if (this.connId == '') {
            this.initBluetoothList();
            this.connBluetooth(device);
          }
          let serviceId = this.currDev.services[0].serviceId;
          let characteristicId = this.currDev.services[0].characteristicId;
          this.senBlData(deviceId, serviceId, characteristicId, command);
        }
      }
    },
    // 获取蓝牙设备list
    getBluetoothList() {
      this.initBluetoothList();
      const data = JSON.stringify(this.devices)
      console.log('获取蓝牙设备list', data)
      this.qrCodeWv.evalJS(`appBluetoothListResult('${data}')`)
    },
    initBluetoothList() {
      this.searchBle();
      setTimeout(() => {
        this.stopFindBule();
      }, 10000)
    },
    // 查找蓝牙设备
    searchBle() {
      var self = this
      console.log("initBule")
      uni.openBluetoothAdapter({
        success(res) {
          console.log("打开 蓝牙模块")
          console.log(res)
          self.onDevice()
          uni.getBluetoothAdapterState({
            success: function (res) {
              console.log(res)
              if (res.available) {
                if (res.discovering) {
                  self.stopFindBule()
                }
                //搜索蓝牙
                //开始搜寻附近的蓝牙外围设备
                console.log("开始搜寻附近的蓝牙外围设备")
                uni.startBluetoothDevicesDiscovery({
                  success(res) {
                    console.log(res)
                  }
                })
              } else {
                console.log('本机蓝牙不可用')
              }
            },
          })
        }
      })
    },
    onDevice() {
      console.log("监听寻找到新设备的事件---------------")
      var self = this
      //监听寻找到新设备的事件
      uni.onBluetoothDeviceFound(function (devices) {
        //获取在蓝牙模块生效期间所有已发现的蓝牙设备
        console.log('--------------new-----------------------' + JSON.stringify(devices))
        var re = JSON.parse(JSON.stringify(devices))
        let name = re.devices[0].name
        if (name != "未知设备" && name.length != 0) {
          console.log(name.length)
          let deviceId = re.devices[0].deviceId
          //信号过滤。大于50
          //如果已经存在也不用加入
          if (re.devices[0].RSSI > self.filterRSSI) {
            if (!self.devices.some(v => v.deviceId == deviceId)) {
              self.devices.push({
                name: name,
                deviceId: deviceId,
                services: []
              })
            }
          }
        }
      })
    },
    stopFindBule() {
      console.log("停止搜寻附近的蓝牙外围设备---------------")
      uni.stopBluetoothDevicesDiscovery({
        success(res) {
          console.log(res)
        }
      })
    },
    // 连接蓝牙
    connBluetooth(device) {
      this.onConn(device);
    },
    // 连接蓝牙
    onConn(item) {
      var self = this
      console.log(`连接蓝牙---------------${item.deviceId}`)
      let deviceId = item.deviceId
      uni.createBLEConnection({
        deviceId: deviceId,
        complete(res) {
          let result = false;
          if (res.errMsg == "createBLEConnection:ok") {
            plus.nativeUI.toast(`设备:${item.name} 已连接`, {
              verticalAlign: 'center'
            })
            self.connId = deviceId;
            self.currDev = item,
              setTimeout(function () {
                self.getBLEServices(deviceId)
              }, 2000)
            result = true;
          } else {
            plus.nativeUI.toast(`设备: ${item.name} 连接失败。请重试!`, {
              verticalAlign: 'center',
            })
            //切换异常时释放掉链接
            if (self.connId != '') {
              uni.closeBLEConnection({
                deviceId: self.connId,
                success(res) {
                  console.log(res)
                }
              })
            }
          }
          //连接成功 关闭搜索
          self.stopFindBule()
          //发生是否成功结果
          var data = {};
          data.result = result;
          var data1 = JSON.stringify(data)
          self.wv.evalJS(`appConnBluetoothResult('${data1}')`)
        },
      })

    },
    getBLEServices(_deviceId) {
      var self = this;
      let deviceId = _deviceId
      console.log("获取蓝牙设备所有服务(service)。---------------")
      uni.getBLEDeviceServices({
        // 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接
        deviceId: deviceId,
        complete(res) {
          console.log(res)
          let serviceId = ""
          for (var s = 0; s < res.services.length; s++) {
            console.log(res.services[s].uuid)
            let serviceId = res.services[s].uuid
            uni.getBLEDeviceCharacteristics({
              // 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接
              deviceId: deviceId,
              // 这里的 serviceId 需要在 getBLEDeviceServices 接口中获取
              serviceId: serviceId,
              success(res) {
                var re = JSON.parse(JSON.stringify(res))

                console.log(`deviceId =[${deviceId}] serviceId = [${serviceId}]`)
                for (var c = 0; c < re.characteristics.length; c++) {
                  if (re.characteristics[c].properties.write == true) {
                    let uuid = re.characteristics[c].uuid
                    console.log(`deviceId =[${deviceId}] serviceId = [${serviceId}] characteristics=[${uuid}]`)
                    for (var index in self.devices) {
                      if (self.devices[index].deviceId == deviceId) {
                        self.devices[index].services.push({
                          serviceId: serviceId,
                          characteristicId: uuid
                        })
                        break
                      }

                    }
                    console.log(JSON.stringify(self.devices))
                  }
                }
              }
            })

          }
        },
        fail(res) {
          console.log(res)
        },
      })

    },
    senBlData(deviceId, serviceId, characteristicId, uint8Array) {
      var uint8Buf = Array.from(uint8Array);

      function split_array(datas, size) {
        var result = {};
        var j = 0
        if (datas.length < size) {
          size = datas.length
        }
        for (var i = 0; i < datas.length; i += size) {
          result[j] = datas.slice(i, i + size)
          j++
        }
        //result[j] = datas
        console.log(result)
        return result
      }
      var sendloop = split_array(uint8Buf, 20);
      // console.log(sendloop.length)
      function realWriteData(sendloop, i) {
        var data = sendloop[i]
        if (typeof (data) == "undefined") {
          return
        }
        //console.log("第【" + i + "】次写数据"+data)
        var buffer = new ArrayBuffer(data.length)
        var dataView = new DataView(buffer)
        for (var j = 0; j < data.length; j++) {
          dataView.setUint8(j, data[j]);
        }
        uni.writeBLECharacteristicValue({
          deviceId,
          serviceId,
          characteristicId,
          value: buffer,
          success(res) {
            console.log('发送成功', i)
            setTimeout(() => {
              realWriteData(sendloop, i + 1);
            }, 100)
          },
          fail(e) {
            console.log('发送数据失败')
            console.log(e)
          }
        })
      }
      var i = 0;
      realWriteData(sendloop, i);
    },
  }
}
</script>

二、H5 Vue项目引入js

1、在public新建js文件夹uni.webview.1.5.4.js文件，其源码地址

https://gitee.com/dcloud/uni-app/raw/dev/dist/uni.webview.1.5.4.js

2、index.html 引入 public/js 下文件

<script src="<%= BASE_URL %>js/uni.webview.1.5.4.js"></script>

3、main.js 定义回调方法和对象

// 蓝牙设备列表
window.appBluetoothListResult = function (val) {
  window.appBluetoothListResultString = val
  window.dispatchEvent(new CustomEvent('bluetoothListResult'))
}

// 蓝牙连接成功或失败
window.appConnBluetoothResult = function (val) {
  window.appConnBluetoothResultString = val
  window.dispatchEvent(new CustomEvent('connBluetoothResult'))
}

4、Vue扫码页面代码

1、在mixins文件夹下新建bluetoothMixins.js：代码如下

export default {
  data() {
    return {
      bluetoothShow: false, // 蓝牙设备弹窗
      deviceId: '', // 蓝牙设备ID
      listArr: [] // 获取所有蓝牙设备
    }
  },
  created() {
    window.addEventListener('bluetoothListResult', this.handleBluetoothList, false)
    window.addEventListener('connBluetoothResult', this.handleConnBluetoothResult, false)
  },
  beforeDestroy() {
    window.removeEventListener('bluetoothListResult', this.handleBluetoothList)
    window.removeEventListener('connBluetoothResult', this.handleConnBluetoothResult)
  },
  methods: {
    handleConnBluetoothResult() {
      const result = window.appConnBluetoothResultString
      console.log('返回蓝牙是否连接成功', result)
      if (JSON.parse(result).result) {
        console.log('连接成功')
        const deviceId = localStorage.getItem('bluetoothDeviceId')
        localStorage.setItem('bluetoothDeviceId', deviceId || this.deviceId)
        // alert(`${this.deviceId}---设置值选中的值`)
        // alert(`${deviceId}---设置值缓存的值`)
        this.bluetoothShow = false
      }
    },
    handleBluetoothList() {
      const result = window.appBluetoothListResultString
      console.log('返回蓝牙list', result)
      if (result) {
        this.bluetoothShow = true
        this.listArr = JSON.parse(result)
      }
    },
    // 选中设备
    selectBluetooth(item) {
      console.log('选中设备', item)
      this.deviceId = item.deviceId
      uni.postMessage({
        data: {
          action: 'connBluetooth',
          params: { deviceId: this.deviceId }
        }
      })
    }
  }
}

2、实际Vue页面：如下

import BluetoothMixins from '@/mixins/bluetoothMixins'
export default {
  mixins: [BluetoothMixins],
  methods: {
  // 点击打印按钮
   async print(deliveryNo) {
      console.log('配送单deliveryNo----', deliveryNo)
      // 获取蓝牙打印参数
      const res = await this.$api.getDeliveryPrintParam({ deliveryNo })
      if (res.success) {
      // 判断之前是否有连接过蓝牙
        const deviceId = localStorage.getItem('bluetoothDeviceId')
        // alert(`${deviceId}---配送单缓存值`)
        if (deviceId) {
          // 连接过直接打印
          uni.postMessage({
            data: {
              action: 'bluetoothPrint',
              params: { deviceId, command: JSON.parse(res.data) }
            }
          })
        } else {
        // 没有连接过，先去获取蓝牙设备数据（list）
          uni.postMessage({
            data: {
              action: 'getBluetoothList'
            }
          })
        }
      }
    }
   }
 }

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