#使用mpvue 开发小程序过程中 简单介绍一下微信小程序蓝牙连接过程
#在蓝牙连接的过程中部分api需要加定时器延时1秒到2秒左右再执行,原因为何不知道,小程序有这样的要求
#1首先是要初始化蓝牙:openBluetoothAdapter()
```js
if (wxopenBluetoothAdapter) {
wxopenBluetoothAdapter({
success: function(res) {
/ 获取本机的蓝牙状态 /
setTimeout(() => {
getBluetoothAdapterState()
}, 1000)
},
fail: function(err) {
// 初始化失败
}
})
} else {
}
```
#2检测本机蓝牙是否可用:
# 要在上述的初始化蓝牙成功之后回调里调用
```js
getBluetoothAdapterState() {
var that= this;
thattoastTitle= '检查蓝牙状态'
wxgetBluetoothAdapterState({
success: function(res) {
startBluetoothDevicesDiscovery()
},
fail(res) {
consolelog(res)
}
})
}
```
#3 开始搜索蓝牙设备:
```js
startBluetoothDevicesDiscovery() {
var that= this;
setTimeout(() => {
wxstartBluetoothDevicesDiscovery({
success: function(res) {
/ 获取蓝牙设备列表 /
thatgetBluetoothDevices()
},
fail(res) {
}
})
}, 1000)
}
```
#4 获取搜索到的蓝牙设备列表
# / thatdeviceName 是获取到的蓝牙设备的名称, 因为蓝牙设备在安卓和苹果手机上搜到的蓝牙地址显示是不一样的,所以根据设备名称匹配蓝牙/
```js
getBluetoothDevices() {
var that= this;
setTimeout(() => {
wxgetBluetoothDevices({
services: [],
allowDuplicatesKey: false,
interval: 0,
success: function(res) {
if (resdeviceslength> 0) {
if (JSONstringify(resdevices)indexOf(thatdeviceName) !== -1) {
for (let i = 0; i < resdeviceslength; i++) {
if (thatdeviceName === resdevices[i]name) {
/ 根据指定的蓝牙设备名称匹配到deviceId /
thatdeviceId = thatdevices[i]deviceId;
setTimeout(() => {
thatconnectTO();
}, 2000);
};
};
} else {
}
} else {
}
},
fail(res) {
consolelog(res, '获取蓝牙设备列表失败=====')
}
})
}, 2000)
},
```
#5连接蓝牙
# 匹配到的蓝牙设备ID 发送连接蓝牙的请求, 连接成功之后 应该断开蓝牙搜索的api,然后去获取所连接蓝牙设备的service服务
```js
connectTO() {
wxcreateBLEConnection({
deviceId: deviceId,
success: function(res) {
thatconnectedDeviceId = deviceId;
/ 4获取连接设备的service服务 /
thatgetBLEDeviceServices();
wxstopBluetoothDevicesDiscovery({
success: function(res) {
consolelog(res, '停止搜索')
},
fail(res) {
}
})
},
fail: function(res) {
}
})
}
```
#6 获取蓝牙设备的service服务,获取的serviceId有多个要试着连接最终确定哪个是稳定版本的service 获取服务完后获取设备特征值
```js
getBLEDeviceServices() {
setTimeout(() => {
wxgetBLEDeviceServices({
deviceId: thatconnectedDeviceId,
success: function(res) {
thatservices= resservices
/ 获取连接设备的所有特征值 /
thatgetBLEDeviceCharacteristics()
},
fail: (res) => {
}
})
}, 2000)
},
```
#7获取蓝牙设备特征值
# 获取到的特征值有多个,最后要用的事能读,能写,能监听的那个值的uuid作为特征值id,
```js
getBLEDeviceCharacteristics() {
setTimeout(() => {
wxgetBLEDeviceCharacteristics({
deviceId: connectedDeviceId,
serviceId: services[2]uuid,
success: function(res) {
for (var i = 0; i < rescharacteristicslength; i++) {
if ((rescharacteristics[i]propertiesnotify || rescharacteristics[i]propertiesindicate) &&
(rescharacteristics[i]propertiesread && rescharacteristics[i]propertieswrite)) {
consolelog(rescharacteristics[i]uuid, '蓝牙特征值 ==========')
/ 获取蓝牙特征值 /
thatnotifyCharacteristicsId = rescharacteristics[i]uuid
// 启用低功耗蓝牙设备特征值变化时的 notify 功能
thatnotifyBLECharacteristicValueChange()
}
}
},
fail: function(res) {
}
})
}, 1000)
},
```
#8启动notify 蓝牙监听功能 然后使用 wxonBLECharacteristicValueChange用来监听蓝牙设备传递数据
#接收到的数据和发送的数据必须是二级制数据, 页面展示的时候需要进行转换
```js
notifyBLECharacteristicValueChange() { // 启用低功耗蓝牙设备特征值变化时的 notify 功能
var that= this;
consolelog('6启用低功耗蓝牙设备特征值变化时的 notify 功能')
wxnotifyBLECharacteristicValueChange({
state: true,
deviceId: thatconnectedDeviceId,
serviceId: thatnotifyServicweId,
characteristicId: thatnotifyCharacteristicsId,
complete(res) {
/用来监听手机蓝牙设备的数据变化/
wxonBLECharacteristicValueChange(function(res) {
//
thatbalanceData += thatbuf2string(resvalue)
thathexstr += thatreceiveData(resvalue)
})
},
fail(res) {
consolelog(res, '启用低功耗蓝牙设备监听失败')
thatmeasuringTip(res)
}
})
},
/转换成需要的格式/
buf2string(buffer) {
var arr = Arrayprototypemapcall(new Uint8Array(buffer), x => x)
return arrmap((char, i) => {
return StringfromCharCode(char);
})join('');
},
receiveData(buf) {
return thishexCharCodeToStr(thisab2hex(buf))
},
/转成二进制/
ab2hex (buffer) {
var hexArr = Arrayprototypemapcall(
new Uint8Array(buffer), function (bit) {
return ('00' + bittoString(16))slice(-2)
}
)
return hexArrjoin('')
},
/转成可展会的文字/
hexCharCodeToStr(hexCharCodeStr) {
var trimedStr = hexCharCodeStrtrim();
var rawStr = trimedStrsubstr(0, 2)toLowerCase() === '0x' trimedStrsubstr(2) : trimedStr;
var len = rawStrlength;
var curCharCode;
var resultStr= [];
for (var i = 0; i < len; i = i+ 2) {
curCharCode = parseInt(rawStrsubstr(i, 2), 16);
resultStrpush(StringfromCharCode(curCharCode));
}
return resultStrjoin('');
},
```
# 向蓝牙设备发送数据
```js
sendData(str) {
let that= this;
let dataBuffer = new ArrayBuffer(strlength)
let dataView = new DataView(dataBuffer)
for (var i = 0; i < strlength; i++) {
dataViewsetUint8(i, strcharAt(i)charCodeAt())
}
let dataHex = thatab2hex(dataBuffer);
thiswriteDatas = thathexCharCodeToStr(dataHex);
wxwriteBLECharacteristicValue({
deviceId: thatconnectedDeviceId,
serviceId: thatnotifyServicweId,
characteristicId: thatnotifyCharacteristicsId,
value: dataBuffer,
success: function (res) {
consolelog('发送的数据:' + thatwriteDatas)
consolelog('message发送成功')
},
fail: function (res) {
},
complete: function (res) {
}
})
},
```
# 当不需要连接蓝牙了后就要关闭蓝牙,并关闭蓝牙模块
```js
// 断开设备连接
closeConnect() {
if (thatconnectedDeviceId) {
wxcloseBLEConnection({
deviceId: thatconnectedDeviceId,
success: function(res) {
thatcloseBluetoothAdapter()
},
fail(res) {
}
})
} else {
thatcloseBluetoothAdapter()
}
},
// 关闭蓝牙模块
closeBluetoothAdapter() {
wxcloseBluetoothAdapter({
success: function(res) {
},
fail: function(err) {
}
})
},
```
#在向蓝牙设备传递数据和接收数据的过程中,并未使用到read的API 不知道有没有潜在的问题,目前线上运行为发现任何的问题
#今天的蓝牙使用心得到此结束,谢谢
12月16日,微信正式发布了WeUIjs动态视觉组件库。WeUI是一套同微信原生视觉体验一致的基础样式库,由微信官方设计团队为微信内网页和微信小程序量身设计,可以让用户的使用感知更加统一。WeUIjs动态视觉组件库包含了button、cell、dialog、progress、toast、article、actionsheet、icon等各式元素。
一、weuijs是什么?
weuijs是WeUI的轻量级JS封装,不需要依赖其它库,GZIP后仅有90 KB。
二、weuijs包含哪些组件?
actionsheet
alert
confirm
dialog
form
gallery
loading
picker
searchbar
slider
tab
toast
toptips
uploader
三、使用方式:
Github:>
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