#鸿蒙学习大百科#如何实现文件的拷贝并监听拷贝进度？

import { common } from '@kit.AbilityKit';
import fs from '@ohos.file.fs';
import fileUri from '@ohos.file.fileuri';
@Entry
@Component
struct Index {
  @State message: string = '12312 121'
  private context = getContext(this) as common.UIAbilityContext;
  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
          .onClick(() => {
            try {
              let progressListener: fs.ProgressListener = (progress: fs.Progress) => {
                console.info(`progressSize: ${progress.processedSize}, totalSize: ${progress.totalSize}`);
              };
              let copyoption: fs.CopyOptions = {
                "progressListener": progressListener
              }
              let applicationContext = this.context.getApplicationContext();
              let cacheDir = applicationContext.cacheDir;
              //将aaa文件拷贝到bbb文件，如果bbb不存在系统会自动创建一个bbb文件
              fs.copy( fileUri.getUriFromPath(cacheDir + "/aaa"),  fileUri.getUriFromPath(cacheDir + "/bbb"), copyoption).then(() => {

              })
            } catch (err) {
              console.error(`Failed to copy: ${JSON.stringify(err)}`);
            }

          })
      }
      .width('100%')
    }
    .height('100%')
  }
}
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