【HarmonyOS】鸿蒙应用蓝牙功能实现（一） - ToB企服应用市场:ToB评测及商务社交产业平台

import { access } from '@kit.ConnectivityKit';
import { BusinessError } from '@kit.BasicServicesKit';
export class BlueToothMgr {
private static mBlueToothMgr: BlueToothMgr | undefined = undefined;
public Ins(){
if(BlueToothMgr.mBlueToothMgr){
BlueToothMgr.mBlueToothMgr = new BlueToothMgr();
}
return BlueToothMgr.mBlueToothMgr;
}
// STATE_OFF 0 表示蓝牙已关闭。
// STATE_TURNING_ON 1 表示蓝牙正在打开。
// STATE_ON 2 表示蓝牙已打开。
// STATE_TURNING_OFF 3 表示蓝牙正在关闭。
// STATE_BLE_TURNING_ON 4 表示蓝牙正在打开LE-only模式。
// STATE_BLE_ON 5 表示蓝牙正处于LE-only模式。
// STATE_BLE_TURNING_OFF 6 表示蓝牙正在关闭LE-only模式。
/**
* 设置蓝牙访问(开关状态)
* @param isAccess true: 打开蓝牙
*/
setBlueToothAccess(isAccess: boolean){
try {
if(isAccess){
access.enableBluetooth();
access.on('stateChange', (data: access.BluetoothState) => {
let btStateMessage = this.switchState(data);
if (btStateMessage == 'STATE_ON') {
access.off('stateChange');
}
console.info('bluetooth statues: ' + btStateMessage);
})
}else{
access.disableBluetooth();
access.on('stateChange', (data: access.BluetoothState) => {
let btStateMessage = this.switchState(data);
if (btStateMessage == 'STATE_OFF') {
access.off('stateChange');
}
console.info("bluetooth statues: " + btStateMessage);
})
}
} catch (err) {
console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}
}
private switchState(data: access.BluetoothState){
let btStateMessage = '';
switch (data) {
case 0:
btStateMessage += 'STATE_OFF';
break;
case 1:
btStateMessage += 'STATE_TURNING_ON';
break;
case 2:
btStateMessage += 'STATE_ON';
break;
case 3:
btStateMessage += 'STATE_TURNING_OFF';
break;
case 4:
btStateMessage += 'STATE_BLE_TURNING_ON';
break;
case 5:
btStateMessage += 'STATE_BLE_ON';
break;
case 6:
btStateMessage += 'STATE_BLE_TURNING_OFF';
break;
default:
btStateMessage += 'unknown status';
break;
}
return btStateMessage;
}
}

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import { access } from '@kit.ConnectivityKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { BlueToothMgr } from '../manager/BlueToothMgr';
import { abilityAccessCtrl, common } from '@kit.AbilityKit';
@Entry
@Component
struct Index {
private TAG: string = "BlueToothTest";
// 蓝牙状态
@State isStartBlueTooth: boolean = false;
@State userGrant: boolean = false;
async aboutToAppear() {
await this.requestBlueToothPermission();
let state = access.getState();
console.log(this.TAG, "getState state: " + state);
if(state == 2){
this.isStartBlueTooth = true;
}else{
this.isStartBlueTooth = false;
}
}
// 用户申请权限
async reqPermissionsFromUser(): Promise<number[]> {
let context = getContext() as common.UIAbilityContext;
let atManager = abilityAccessCtrl.createAtManager();
let grantStatus = await atManager.requestPermissionsFromUser(context, ['ohos.permission.ACCESS_BLUETOOTH']);
return grantStatus.authResults;
}
// 用户申请蓝牙权限
async requestBlueToothPermission() {
let grantStatus = await this.reqPermissionsFromUser();
for (let i = 0; i < grantStatus.length; i++) {
if (grantStatus[i] === 0) {
// 用户授权，可以继续访问目标操作
this.userGrant = true;
}
}
}
setBlueToothState =()=>{
try {
if(!this.isStartBlueTooth){
BlueToothMgr.Ins().setBlueToothAccess(true);
}else{
BlueToothMgr.Ins().setBlueToothAccess(false);
}
let state = access.getState();
if(state == 2){
this.isStartBlueTooth = true;
}else{
this.isStartBlueTooth = false;
}
console.log(this.TAG, "getState state: " + state);
} catch (err) {
console.error(this.TAG,'errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}
}
build() {
RelativeContainer() {
if(this.userGrant){
Text("蓝牙状态:" + this.isStartBlueTooth ? "开启" : "关闭")
.id('HelloWorld')
.fontSize(50)
.fontWeight(FontWeight.Bold)
.alignRules({
center: { anchor: '__container__', align: VerticalAlign.Center },
middle: { anchor: '__container__', align: HorizontalAlign.Center }
})
.onClick(this.setBlueToothState)
}
}
.height('100%')
.width('100%')
}
}

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"requestPermissions": [
{
"name" : "ohos.permission.ACCESS_BLUETOOTH",
"reason": "$string:permission_name",
"usedScene": {
"abilities": [
"EntryAbility"
],
"when":"inuse"
}
}
]

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