如何在flutter中将https网络URL图片下载到app目录中

dependencies:
  flutter:
    sdk: flutter
  http: ^0.13.4
  path_provider: ^2.0.5

import 'dart:io';
import 'package:http/http.dart' as http;
import 'package:path_provider/path_provider.dart';

Future<void> downloadImage(String imageUrl) async {
  final response = await http.get(Uri.parse(imageUrl));
  final appDir = await getApplicationDocumentsDirectory();
  final file = File('${appDir.path}/image.jpg');
  await file.writeAsBytes(response.bodyBytes);
}

downloadImage('https://example.com/image.jpg');