android - 将内容 URI 转换为 FileUpload

Question

我从 getContent 获取内容 URI，我想将其转换为 FileUpload

  object upload : FileUpload(mimetype) {
    override fun contentLength(): Long {
      TODO("return contentLength here")
    }
    override fun fileName(): String? {
      TODO("return fileName to use in the multipart request here")
    }
    override fun writeTo(sink: BufferedSink) {
      TODO("write the data here")
    }
  }