如何在flutter中重命名裁剪后的图像？

dependencies:
  flutter:
    sdk: flutter
  image_picker: ^0.8.4+4
  path_provider: ^2.0.5

import 'package:image_picker/image_picker.dart';
import 'package:path_provider/path_provider.dart';
import 'dart:io';

Future<void> pickAndRenameImage() async {
  final picker = ImagePicker();
  final pickedFile = await picker.pickImage(source: ImageSource.gallery);

  if (pickedFile != null) {
    final directory = await getApplicationDocumentsDirectory();
    final fileName = 'new_image.jpg'; // 设置新的文件名
    final newPath = '${directory.path}/$fileName';

    final File newFile = await File(pickedFile.path).copy(newPath);
    // 重命名后的图像文件路径为newPath
  }
}

FlatButton(
  onPressed: () {
    pickAndRenameImage();
  },
  child: Text('选择并重命名图像'),
),