HarmonyOS 本地调用蓝牙问题？

Question

如题：HarmonyOS 本地调用蓝牙问题？

Answer 1

可以参考以下demo：

import abilityAccessCtrl, { Permissions } from '@ohos.abilityAccessCtrl';
import common from '@ohos.app.ability.common';
import { BusinessError } from '@ohos.base';

// 使用UIExtensionAbility：将common.UIAbilityContext 替换为common.UIExtensionContext
import bundleManager from '@ohos.bundle.bundleManager';
async function checkAccessToken(permission: Permissions): Promise<abilityAccessCtrl.GrantStatus> {
  let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager();
  let grantStatus: abilityAccessCtrl.GrantStatus = abilityAccessCtrl.GrantStatus.PERMISSION_DENIED;

  // 获取应用程序的accessTokenID
  let tokenId: number = 0;
  try {
    let bundleInfo: bundleManager.BundleInfo =
      await bundleManager.getBundleInfoForSelf(bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION);
    let appInfo: bundleManager.ApplicationInfo = bundleInfo.appInfo;
    tokenId = appInfo.accessTokenId;
  } catch (error) {
    const err: BusinessError = error as BusinessError;
    console.error(`Failed to get bundle info for self. Code is ${err.code}, message is ${err.message}`);
  }

  // 校验应用是否被授予权限
  try {
    grantStatus = await atManager.checkAccessToken(tokenId, permission);
  } catch (error) {
    const err: BusinessError = error as BusinessError;
    console.error(`Failed to check access token. Code is ${err.code}, message is ${err.message}`);
  }
  return grantStatus;
}

@Entry
@Component
struct Index {
  onPageShow(): void {
    //检测蓝牙权限是否开启
    checkAccessToken('ohos.permission.USE_BLUETOOTH')
      .then((res) => {
        if (res == -1) {
          //未授权
          let context: common.UIAbilityContext = getContext(this) as common.UIAbilityContext;
          this.reqPermissionsFromUser(this.permissions, context)
        } else {
          //已授权不做任何操作
        }
      })
  }

  reqPermissionsFromUser(permissions: Array<Permissions>, context: common.UIAbilityContext): void {
    let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager();
    // requestPermissionsFromUser会判断权限的授权状态来决定是否唤起弹窗
    atManager.requestPermissionsFromUser(context, permissions).then((data) => {
      let grantStatus: Array<number> = data.authResults;
      let length: number = grantStatus.length;
      for (let i = 0; i < length; i++) {
        if (grantStatus[i] === 0) {
          this.bule = true
          // 用户授权，可以继续访问目标操作
        } else {
          // 用户拒绝授权，提示用户必须授权才能访问当前页面的功能，并引导用户到系统设置中打开相应的权限
          let context = getContext(this) as common.UIAbilityContext;
          context.startAbility({
            bundleName: 'com.huawei.hmos.settings',
            abilityName: 'com.huawei.hmos.settings.MainAbility',
            uri: 'application_info_entry',
            parameters: {
              pushParams: 'com.example.myapplication' // 应用包名
            }
          });
          return;
        }
      }
      // 授权成功
    }).catch((err: BusinessError) => {
      console.error(`Failed to request permissions from user. Code is ${err.code}, message is ${err.message}`);
    })
  }
  permissions: Array<Permissions> = ['ohos.permission.ACCESS_BLUETOOTH'];
  @State bule: boolean = true
  build() {
    Column() {
    }
  }
}