1、初始化藍牙

不管是ios操作系統(tǒng)還是安卓操作系統(tǒng)，第一步都需要初始化藍牙

// 藍牙設備初始化
export function openBluetoothAdapter () {
  return new Promise((resolve, reject) => {
    wx.openBluetoothAdapter({
      success: function (res) {
        console.log(res, '藍牙初始化成功')
        resolve() 
      },
      fail: function () {
        wx.showToast({
          title: '請打開藍牙',
          icon: "success",
          duration: 2000
        })
        setTimeout(function () {
          wx.hideToast()
        }, 2000)
      }
    })
  })
}

2、獲取藍牙適配器狀態(tài)

// 獲取本機藍牙適配器狀態(tài)
export function getBleAdapterState () {
  return new Promise((resolve, reject) => {
    wx.getBluetoothAdapterState({
      success: function(res) {
        let available = res.available
        if (!available) {
          wx.showToast({
            title: '設備無法開啟藍牙連接',
            icon: 'success',
            duration: 2000
          })
          setTimeout(function() {
            wx.hideToast()
          }, 2000)
        } else {
          resolve()
        }
      }
    })
  })
}

3、ios和安卓的操作系統(tǒng)對藍牙的連接方式不同

1. 安卓是直接對設備的macAddress進行連接
2. ios需要對周邊的藍牙設備就行搜索：

export function startBluetoothDevicesDiscovery () {
  return new Promise((resolve, reject) =>{
	wx.startBluetoothDevicesDiscovery({
       services: [],
       success: function () {
         console.log('開始搜索藍牙')
         wx.onBluetoothDeviceFound(function (res) {
           console.log(res, '搜索藍牙相關設備')
           for (let i = 0; i < res.devices.length; i++) {
             // app.globalData.bleConfig.name 這里提前就獲取了設備的name
             if (res.devices[i].localName == app.globalData.bleConfig.name) {
               var deviceId = res.devices[i].deviceId
               // 將設備的deviceId存在globalData里面
               app.globalData.bleConfig.deviceId = deviceId
               // ios搜索出目標設備后，將停止搜索，否則影響手機性能
               wx.stopBluetoothDevicesDiscovery({
                 success: function() {
                 }
               })
               resolve()
             }
           }
         })
       },
     })
  })
}

4、藍牙連接

export function createBleConnection (deviceId) {
  return new Promise((resolve, reject) => {
    wx.createBLEConnection({
     // 這個連接時間timeout是根據(jù)設備發(fā)送藍牙廣播的時間頻率有關，很重要
      timeout: 5000,
      deviceId: deviceId,
      success: function (res) {
       // 連接成功后返回deviceId，供后面獲取藍牙服務需要
        resolve(deviceId)
      },
      fail: function (err) {
        reject(err)
      }
    })
  })
}

5、獲取藍牙多個service

export function getBLEDeviceServices (deviceId) {
  return new Promise((resolve, reject) => {
    wx.getBLEDeviceServices({
      deviceId: deviceId,
      success: function (res) {
        for (var i = 0; i <= res.services.length - 1; i++) {
          // 這里需要根據(jù)設備提供的服務進行判斷，比如（讀寫服務）
          if (res.services[i].uuid.indexOf("B5A3") >= 0) {
            let serviceId = res.services[i].uuid
            // 將serviceId 存在globalData
            app.globalData.bleConfig.serviceId = serviceId
            resolve({serviceId, deviceId})
          }
        }
      }
    })
  })
}

6、開啟notify

export function openBleNotify (ids) {
  return new Promise((resolve, reject) => {
    wx.getBLEDeviceCharacteristics({
      deviceId: ids.deviceId,
      serviceId: ids.serviceId,
      success: function (res) {
        let FF3 = res.characteristics[0].uuid //notify支持
        let characteristicId = res.characteristics[1].uuid //可以寫 可以讀
        app.globalData.bleConfig.FF3 = FF3
        app.globalData.bleConfig.characteristicId = characteristicId
        wx.notifyBLECharacteristicValueChanged({
          deviceId: ids.deviceId,
          serviceId: ids.serviceId,
          characteristicId: FF3,
          state: true,
          success: function (res) {
            console.log("notify成功")
            resolve({...ids, ...{characteristicId}})
          }
        })

      },
      fail: function (res) {
      }
    })
  })
}

7、向藍牙寫入數(shù)據(jù)

export function writeBleValue (bleData) {
  return new Promise((resolve, reject) => {
    wx.writeBLECharacteristicValue({
      deviceId: bleData.deviceId,
      serviceId: bleData.serviceId,
      characteristicId: bleData.characteristicId,
      // 寫入arrayBuffer
      value: bleData.buffer,
      success: function (res) {
        resolve()
      },
      fail: function (err) {
        console.log(err)
      }
    })
  })
}

最后

  onLoad(options) {
   this.bleConnect()
  },
  // 藍牙連接
  bleConnect () {
    // 1.分辨系統(tǒng)
    getSystemInfo().then(res => {
      if (res === 'ios') {
      openBluetoothAdapter().then(getBleAdapterState).then(startBluetoothDevicesDiscovery)
	    .then(() =>{
	      this.bleConnectSuccess()
	    })
      } else {
       	openBluetoothAdapter().then(getBleAdapterState).then(() =>{
		  this.bleConnectSuccess()
		})
      }
    })
  },
  bleConnectSuccess () {
    let that = this
    let deviceId = app.globalData.bleConfig.deviceId
    new Promise((resolve, reject) => {
      createBleConnection(deviceId).then(deviceid => {
        // 連接成功后藍牙監(jiān)聽
        wx.onBLEConnectionStateChange(function (res) {
          // 該方法回調中可以用于處理連接意外斷開等異常情況
          if (!res.connected) {
            console.log('藍牙已經(jīng)斷開----')
            that.setData({
              disabled: true, // 支付按鈕置灰
            })
          }
        })
        // 獲取藍牙服務,并且開啟notify
        getBLEDeviceServices(deviceid).then(openBleNotify).then(ids => {
          // 這里可以向設備寫一些數(shù)據(jù)進去連接確認
         
          // 模擬成功后寫入特征值后設備返回的數(shù)據(jù)
          wx.onBLECharacteristicValueChange(function(res) {
      		console.log(res, '返回的arrayBuffer')
    	  })
          resolve()
        })
      }).catch((err) => { // 重開
        // 當連接時間超過timeout以后需要重新進行連接，藍牙優(yōu)化
        that.data.connecttimes++
        that.setData({
          connecttimes: that.data.connecttimes
        })
        if (that.data.connecttimes === 5) {
          wx.showModal({
            title: '提示',
            content: '請檢查設備是否斷電和手機藍牙再進行連接',
            showCancel: false,
            success: function (res) {
              if (res.confirm) {
                wx.reLaunch({
                  url: '../index/index',
                })
              }
            }
          })
          return false
        } 
        that.bleConnectSuccess(app.globalData.bleConfig.deviceId)
      })
    })
  },

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