一、学习笔记

HarmonyOS NEXT API 12

二、代码实例

文件下载

  async downloadFile(url: string, result?: (taskInfo: request.agent.TaskInfo | undefined) => void) {

    let config: request.agent.Config = {
      action: request.agent.Action.DOWNLOAD,
      url: url,
      mode: request.agent.Mode.BACKGROUND,
      overwrite: true,  // 覆盖已存在文件
      metered: true,
      redirect: true,
      gauge: false,
      precise: false,
    }
    try {
      let downloadTask = await request.agent.create(getContext(), config)

      let completeCallback = async () => {
        let taskInfo = await request.agent.show(downloadTask.tid)
        result?.(taskInfo)
      }
      let failCallback = async () => {
        result?.(undefined)
      }
      downloadTask?.on('completed', completeCallback);
      downloadTask?.on('failed', failCallback);
      downloadTask.start()
    } catch (err) {
      result?.(undefined)
    }
  }