HarmonyOS 鸿蒙Next 如何在文件内选择其他app预览文件

参考demo： 运行之后点击传到沙箱，点击预览，选择右上角的使用wps office打开

import common from '@ohos.app.ability.common';
import fs from '@ohos.file.fs';
import { filePreview } from '@kit.PreviewKit';
import { BusinessError } from '@kit.BasicServicesKit';
import fileUri from '@ohos.file.fileuri';
import { picker } from '@kit.CoreFileKit';

let context = getContext(this) as common.UIAbilityContext;
let uiContext = getContext(this);

let fileInfo: filePreview.PreviewInfo = {
  title: '1.xls',
  uri: '',
  mimeType: 'application/vnd.ms-excel'
};

function copyFile() {
  console.log("copyFile!")
  let documentPicker = new picker.DocumentViewPicker();

  let srcFileDescriptor = context.resourceManager.getRawFdSync('1.xls');
  let stat = fs.statSync(srcFileDescriptor.fd)
  console.log(`stat isFile:${stat.isFile()}`);

  fs.stat(srcFileDescriptor.fd).then((stat: fs.Stat) => {
    console.info("get file info succeed, the size of file is " + stat.size);
  }).catch((err: BusinessError) => {
    console.error("get file info failed with error message: " + err.message + ", error code: " + err.code);
  });

  let pathDir = context.filesDir;
  console.log("path:", pathDir)
  let dstPath = pathDir + "/1.xls";
  let dest = fs.openSync(dstPath, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE);
  let fileUriTmp = fileUri.getUriFromPath(dstPath);
  fileInfo.uri = fileUriTmp;
  let bufsize = 4096
  let buf = new ArrayBuffer(bufsize)
  let off = 0, len = 0, readedLen = 0
  while (len = fs.readSync(srcFileDescriptor.fd, buf, { offset: srcFileDescriptor.offset + off, length: bufsize })) {
    readedLen += len
    fs.writeSync(dest.fd, buf, { offset: off, length: len })
    off = off + len
    if ((srcFileDescriptor.length - readedLen) < bufsize) {
      bufsize = srcFileDescriptor.length - readedLen
    }
  }
  fs.close(dest.fd)
}

@Entry
@Component
struct Xlsx {
  @State message: string = '预览';

  build() {
    Row() {
      Column() {
        Button('传到沙箱')
          .onClick(() =>{
            copyFile()
          })
        Button(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
          .onClick(() => {
            filePreview.openPreview(uiContext, fileInfo).then(() => {
              console.info('openPreview success');
            }).catch((err: BusinessError) => {
              console.error('openPreview failed, err = ' + err.message);
            });
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}