在Flutter中加载ListView中特定类别的JSON数据

import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;

class MyData {
  final String category;
  final String title;

  MyData({required this.category, required this.title});

  factory MyData.fromJson(Map<String, dynamic> json) {
    return MyData(
      category: json['category'],
      title: json['title'],
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  List<MyData> dataList = [];

  Future<void> fetchData() async {
    final response = await http.get(Uri.parse('https://example.com/data.json'));
    if (response.statusCode == 200) {
      final jsonData = json.decode(response.body);
      dataList = List<MyData>.from(jsonData.map((data) => MyData.fromJson(data)));
      setState(() {});
    }
  }

  List<MyData> filterDataByCategory(String category) {
    return dataList.where((data) => data.category == category).toList();
  }

  @override
  void initState() {
    super.initState();
    fetchData();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('ListView Example'),
      ),
      body: ListView.builder(
        itemCount: filterDataByCategory('specific_category').length,
        itemBuilder: (context, index) {
          final data = filterDataByCategory('specific_category')[index];
          return ListTile(
            title: Text(data.title),
          );
        },
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MyHomePage(),
  ));
}