请求通知授权

应用需要获取用户授权才能发送通知。在通知发布前调用requestEnableNotification()接口，弹窗让用户选择是否允许发送通知。当用户拒绝授权后，将无法通过该接口再次拉起弹窗。如果应用需要向用户再次申请通知授权，则可以使用openNotificationSettings接口拉起通知管理半模态弹窗。

接口说明

接口详情参见@ohos.notificationManager (NotificationManager模块)。

表1 通知授权接口功能介绍

接口名	描述
isNotificationEnabled():Promise<boolean>	查询通知是否授权。
requestEnableNotification(context: UIAbilityContext): Promise<void>	请求发送通知的许可，第一次调用会弹窗让用户选择。
openNotificationSettings(context: UIAbilityContext): Promise<void>	拉起通知管理弹窗。

开发步骤

1. 导入NotificationManager模块。

   import { notificationManager } from '@kit.NotificationKit';
   import { BusinessError } from '@kit.BasicServicesKit';
   import { hilog } from '@kit.PerformanceAnalysisKit';
   import { common } from '@kit.AbilityKit';
   
   const TAG: string = '[PublishOperation]';
   const DOMAIN_NUMBER: number = 0xFF00;

2. 拉起通知弹窗，向用户请求通知授权。

   可通过requestEnableNotification的错误码判断用户是否授权。若返回的错误码为1600004，即为拒绝授权。

   let context: common.UIAbilityContext = this.getUIContext().getHostContext() as common.UIAbilityContext;
   notificationManager.isNotificationEnabled().then((data: boolean) => {
     hilog.info(DOMAIN_NUMBER, TAG, `isNotificationEnabled success, data: ${data}` );
     if (!data) {
       notificationManager.requestEnableNotification(context).then(() => {
         hilog.info(DOMAIN_NUMBER, TAG, `[ANS] requestEnableNotification success`);
       }).catch((err: BusinessError) => {
         if (1600004 == err.code) {
           hilog.error(DOMAIN_NUMBER, TAG,
             `[ANS] requestEnableNotification refused, code is ${err.code}, message is ${err.message}`);
         } else {
           hilog.error(DOMAIN_NUMBER, TAG,
             `[ANS] requestEnableNotification failed, code is ${err.code}, message is ${err.message}`);
         }
       });
     }
   }).catch((err: BusinessError) => {
     hilog.error(DOMAIN_NUMBER, TAG,
       `isNotificationEnabled fail, code is ${err.code}, message is ${err.message}`);
   });

3. （可选）拉起通知管理半模态弹窗，向用户再次申请通知授权。

   let context: common.UIAbilityContext = this.getUIContext().getHostContext() as common.UIAbilityContext;
   notificationManager.isNotificationEnabled().then((data: boolean) => {
     hilog.info(DOMAIN_NUMBER, TAG, `isNotificationEnabled success, data:  ${data}`);
     if (!data) {
       notificationManager.openNotificationSettings(context).then(() => {
         hilog.info(DOMAIN_NUMBER, TAG, `[ANS] openNotificationSettings success`);
       }).catch((err: BusinessError) => {
         hilog.error(DOMAIN_NUMBER, TAG,
           `[ANS] openNotificationSettings failed, code is ${err.code}, message is ${err.message}`);
       });
     }
   }).catch((err: BusinessError) => {
     hilog.error(DOMAIN_NUMBER, TAG,
       `isNotificationEnabled fail, code is ${err.code}, message is ${err.message}`);
   });