HarmonyOS webview如何调用原生相机、访问相册，帮忙给下用法还有示例？

import { BusinessError } from '@kit.BasicServicesKit'; 
import { picker } from '@kit.CoreFileKit'; 
import web_webview from '@ohos.web.webview'; 
 
@Entry 
@Component 
struct WebComponent { 
  controller: web_webview.WebviewController = new web_webview.WebviewController() 
  //定义一个全局的string类型的数组，用来存放通过picker拉起后选择完图片后图片的uri 
  @State uris: Array<string> = [] 
 
  aboutToAppear() { 
    web_webview.WebviewController.setWebDebuggingAccess(true); 
  } 
 
  build() { 
    Column() { 
      Web({ src: $rawfile('TestonShowFileSelector.html'), controller: this.controller }) 
        .javaScriptAccess(true) 
        .domStorageAccess(true) 
        .onShowFileSelector((event) => { 
          // //-------调用相册------------------------- console.log('MyFileUploader onShowFileSelector invoked') 
          const photoSelectOptions = new picker.PhotoSelectOptions(); 
          // 过滤选择媒体文件类型为IMAGE_VIDEO_TYPE 
          photoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_VIDEO_TYPE; 
          // 选择媒体文件的最大数目 
          photoSelectOptions.maxSelectNumber = 2; 
          const photoViewPicker = new picker.PhotoViewPicker(); 
          photoViewPicker.select(photoSelectOptions).then((photoSelectResult: picker.PhotoSelectResult) => { 
            this.uris = photoSelectResult.photoUris; 
            console.info('photoViewPicker.select to file succeed and uris are:' + this.uris); 
          }).catch((err: BusinessError) => { 
            console.error(`Invoke photoViewPicker.select failed, code is ${err.code}, message is ${err.message}`); 
          }) 
          return false 
        }) 
    } 
  } 
}