HarmonyOS 鸿蒙Next 调用三方应用打开文档类

在rawlife下新建一个1.doc，然后执行下面的demo，打开一个doc文件，自带的文档浏览，然后右上角会提示使用其他文件打开，然后下载wps，就可以使用wps打开，看下这样是否满足需求。

import common from '[@ohos](/user/ohos).app.ability.common';
import fs from '[@ohos](/user/ohos).file.fs';
import { filePreview } from '[@kit](/user/kit).PreviewKit';
import { BusinessError } from '[@kit](/user/kit).BasicServicesKit';
import fileUri from '[@ohos](/user/ohos).file.fileuri';
import  { picker } from '[@kit](/user/kit).CoreFileKit';
let context = getContext(this) as common.UIAbilityContext;
let uiContext = getContext(this);
let fileInfo: filePreview.PreviewInfo = {
 // 文件预览信息，包含了文件标题名、uri以及文件类型（mimeType）
 title: '1.doc',
 uri: '',
 // mimeType: 'application/pdf' // 文件(夹)的媒体资源类型，如text/plain
 mimeType: 'application/msword' // 文件(夹)的媒体资源类型，如text/plain
};
function  copyFile() {
 console.log("copyFile!")
 // let documentSelectOptions = new picker.DocumentSelectOptions();
 let documentPicker = new picker.DocumentViewPicker();
 // let srcFileDescriptor = context.resourceManager.getRawFdSync('蓝牙ble 模式的demo使用说明%E5%85%B3%E8%81%94%E6%96%87%E4%BB%B6.pdf');
 let srcFileDescriptor = context.resourceManager.getRawFdSync('1.doc');
 //这里填rawfile文件夹下的文件名（包括后缀）
 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);
 });
 // 通过UIAbilityContext获取沙箱地址filesDir，以Stage模型为例
 let pathDir = context.filesDir;
 console.log("path:", pathDir)
 let dstPath = pathDir + "/1.doc";
 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](/user/Entry)
[@Component](/user/Component)
struct Xlsx {
 [@State](/user/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%')
 }
}