从已有的json列表中提取唯一值，创建唯一的listview构建器

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

class UniqueListView extends StatelessWidget {
  final List<dynamic> jsonList;

  UniqueListView({required this.jsonList});

  @override
  Widget build(BuildContext context) {
    // Extract unique values from JSON list
    Set<dynamic> uniqueValues = Set();
    for (var jsonItem in jsonList) {
      uniqueValues.add(jsonItem['id']);
    }

    // Create ListView builder
    return ListView.builder(
      itemCount: uniqueValues.length,
      itemBuilder: (BuildContext context, int index) {
        // Create list item for each unique value
        return ListTile(
          title: Text(uniqueValues.elementAt(index).toString()),
        );
      },
    );
  }
}

void main() {
  // Example JSON list
  String jsonString = '''
    [
      {"id": 1, "name": "Item 1"},
      {"id": 2, "name": "Item 2"},
      {"id": 3, "name": "Item 3"},
      {"id": 1, "name": "Item 4"},
      {"id": 2, "name": "Item 5"}
    ]
  ''';

  // Parse JSON list
  List<dynamic> jsonList = jsonDecode(jsonString);

  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: Text('Unique ListView'),
      ),
      body: UniqueListView(jsonList: jsonList),
    ),
  ));
}