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OpenHarmony蓝牙模块提供了ble的功能，本篇提供一个简单的app供测试时使用。代码使用API10，对应4.0Release版本固件。

1.开启BLE

开启BLE前，先在设置界面中打开蓝牙开关。

openBle()函数负责打开ble扫描，并打印扫描结果。主要代码如下：

import ble from "@ohos.bluetooth.ble"openBle():void {try {ble.on("BLEDeviceFind", (data:Array<ble.ScanResult>) => {// console.info('BLE scan device find result = '+ JSON.stringify(data));let i = 0data.forEach(element => {console.info('BLE scan device[' + i + '] deviceId = '+ element["deviceId"] +' name = ' + element["deviceName"]  +' rssi = ' + element["rssi"] +' data['+element["data"].byteLength+'] = ' +this.dataToString(element["data"]))if (element.rssi > minRssi && element.deviceName != '' ) {this.addData(element)}i++});});ble.startBLEScan(null,{interval: 500,dutyMode: ble.ScanDuty.SCAN_MODE_LOW_POWER,matchMode: ble.MatchMode.MATCH_MODE_AGGRESSIVE,});} catch (err) {console.error("ble errCode:" + (err as BusinessError).code + ",errMessage:" + (err as BusinessError).message);}}

2.关闭BLE

            ble.off('BLEDeviceFind')ble.stopBLEScan();

3.添加ble设备

扫描到ble设备后，添加到本地列表并显示

  addData(data:ble.ScanResult):void {let bFind = falsethis.availableDevices.forEach(element => {if (!bFind && element.deviceId == data.deviceId) {console.info('BLE scan update ' + data.deviceId + ' rssi:' + element.rssi +' ==> '+ data.rssi)element.rssi = data.rssibFind = true}})if (!bFind) {console.info('BLE scan add ' + data.deviceId + ' count:' + this.availableDevices.length)this.availableDevices.push(data)this.message='BLE count:' + this.availableDevices.length}}

4.ble数据转换

将ble的data为16进制字符串

  dataToString(data:ArrayBuffer) :String {let str = ''let v = new Uint8Array(data);v.forEach(element => {let s = ''s =  element.toString(16)if (s.length == 1) {s = '0'+s}str+=s+' '});return str}

最终的效果：

完整hap代码，请从链接下载

https://download.csdn.net/download/pjie131_/89279567