如何在Flutter中从AssetImage获取图像文件名？

String imageName = 'example.png';
Image.asset('assets/$imageName');

{
  "images": {
    "exampleImage": "example.png"
  }
}

import 'dart:convert';
import 'package:flutter/services.dart' show rootBundle;

Future<String> getImageName(String key) async {
  final String jsonString = await rootBundle.loadString('assets/assets.json');
  final Map<String, dynamic> jsonMap = json.decode(jsonString);
  return jsonMap['images'][key];
}

void main() async {
  String imageName = await getImageName('exampleImage');
  print(imageName); // 输出: example.png
}

class CustomAssetImage extends AssetImage {
  final String fileName;

  CustomAssetImage(String assetPath, {this.fileName}) : super(assetPath);

  String getFileName() {
    return fileName;
  }
}

// 使用自定义AssetImage
CustomAssetImage customImage = CustomAssetImage('assets/example.png', fileName: 'example.png');
print(customImage.getFileName()); // 输出: example.png