如何显示从Flutter image_picker插件获取的图像文件大小？

import 'package:image_picker/image_picker.dart';

PickedFile? pickedFile = await ImagePicker().getImage(source: ImageSource.gallery);

String? imagePath = pickedFile?.path;

import 'dart:io';

File imageFile = File(imagePath!);
int fileSizeInBytes = imageFile.lengthSync();

String formatFileSize(int fileSizeInBytes) {
  if (fileSizeInBytes < 1024) {
    return '$fileSizeInBytes B';
  } else if (fileSizeInBytes < 1024 * 1024) {
    double fileSizeInKB = fileSizeInBytes / 1024;
    return '${fileSizeInKB.toStringAsFixed(2)} KB';
  } else {
    double fileSizeInMB = fileSizeInBytes / (1024 * 1024);
    return '${fileSizeInMB.toStringAsFixed(2)} MB';
  }
}

String formattedFileSize = formatFileSize(fileSizeInBytes);