HarmonyOS鸿蒙Next中权限的获取，包含提醒用户是否“允许”、免允许组件demo

Index文件中：

import { abilityAccessCtrl, bundleManager, common, Permissions, Want } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';

const permissions: Array<Permissions> = ["ohos.permission.CAMERA"];

async function checkPermissions(): Promise<void> {
  let grantStatus: abilityAccessCtrl.GrantStatus = await checkAccessToken(permissions[0]);

  if (grantStatus === abilityAccessCtrl.GrantStatus.PERMISSION_GRANTED) {
    // 已经授权，可以继续访问目标操作
    console.log("已经授权，可以继续访问目标操作")

  } else {
    // 申请相机权限
    const context: common.UIAbilityContext = getContext() as common.UIAbilityContext;
    reqPermissionsFromUser(permissions, context);
  }
}

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;
}

//向用户申请权限

function reqPermissionsFromUser(permissions: Array<Permissions>, context: common.UIAbilityContext): void {
  let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager();
  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) {
        // 用户授权，可以继续访问目标操作
        console.log("已经授权，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
        openPermissionsInSystemSettings(context)
        return;
      }
    }
    // 授权成功
  }).catch((err: BusinessError) => {
    console.error(`Failed to request permissions from user. Code is ${err.code}, message is ${err.message}`);
  })
}

//前往设置界面
function openPermissionsInSystemSettings(context: common.UIAbilityContext): void {
  // let context = getContext(this) as common.UIAbilityContext
  let wantInfo: Want = {
    bundleName: 'com.huawei.hmos.settings',
    abilityName: 'com.huawei.hmos.settings.MainAbility',
    uri: 'application_info_entry',
    parameters: {
      settingsParamBundleName: 'com.example.perssions' // Open the details page of a specified application.
    }
  }
  context.startAbility(wantInfo).then(() => {
  }).catch((error: Error) => {
  })
}

@Entry
@Component

struct Index {

  aboutToAppear() {
    checkPermissions()//检查用户是否授予权限
  }

  build() {
    Row() {
      Column() {
      }
      .width('100%')
    }
    .height('100%')
  }
}