分享App Linking直达应用

提供如何通过隔空传送分享实现直达应用，应用需接入App Linking以确保端到端完整的体验。参考：使用App Linking实现应用间跳转。

注意事项

1. 当进入可分享页面时，使用harmonyShare.on('gesturesShare')方法注册隔空传送监听事件。
2. 当离开可分享页面（包括应用退至后台等场景）时，使用harmonyShare.off('gesturesShare')方法取消隔空传送监听事件。

开发步骤

1. 导入相关模块。

   import { uniformTypeDescriptor as utd } from '@kit.ArkData';
   import { systemShare, harmonyShare } from '@kit.ShareKit';
   import { fileUri } from '@kit.CoreFileKit';

2. 定义隔空传送分享事件监听/取消监听方法（收到隔空传送分享事件回调后，建议3秒内调用sharableTarget.share()方法发起分享，否则可能导致超时失败）。

   private immersiveCallback = (sharableTarget: harmonyShare.SharableTarget) => {
     let uiContext: UIContext = this.getUIContext();
     let contextFaker: Context = uiContext.getHostContext() as Context;
     let filePath = contextFaker.filesDir + '/exampleKnock1.jpg'; // 仅为示例 请替换正确的文件路径
     let shareData: systemShare.SharedData = new systemShare.SharedData({
       utd: utd.UniformDataType.HYPERLINK,
       content: 'https://sharekitdemo.drcn.agconnect.link/ZB3p',
       thumbnailUri: fileUri.getUriFromPath(filePath),
       title: '隔空传送分享卡片标题',
       description: '隔空传送分享卡片描述'
     });
     sharableTarget.share(shareData);
   }
   
   private immersiveListening() {
     harmonyShare.on('gesturesShare', this.immersiveCallback);
   }
   
   private immersiveDisablingListening() {
     harmonyShare.off('gesturesShare', this.immersiveCallback);
   }

3. 进入可分享页面时，注册隔空传送分享监听事件；离开可分享页面（包括应用退至后台等场景）时，取消隔空传送分享监听事件。

   // Entry Component 代码片段
   onPageHide(): void {
     let uiContext: UIContext = this.getUIContext();
     let context: Context = uiContext.getHostContext() as Context;
     context.eventHub.emit('onBackGround');
   }

   aboutToAppear(): void {
     this.immersiveListening();
     let uiContext: UIContext = this.getUIContext();
     let context: Context = uiContext.getHostContext() as Context;
     context.eventHub.on('onBackGround', this.onBackGround);
   }
   
   aboutToDisappear(): void {
     this.immersiveDisablingListening();
     let uiContext: UIContext = this.getUIContext();
     let context: Context = uiContext.getHostContext() as Context;
     context.eventHub.off('onBackGround', this.onBackGround);
   }
   
   private onBackGround = () => {
     this.immersiveDisablingListening();
   }