如何将 API 列表数据映射到单个复选框?在颤抖中

how to map API list data to single checkbox? in flutter

嗨,我是 flutter 的新手,我需要帮助来获取 API 数据并显示 select 和 deselect 的复选框。 我使用了示例 API 数据库,其中包含 10 个用户的信息。我想将用户 ID、姓名、用户名、公司名称和 phone 号码显示为每个用户的卡片或列表磁贴。我还想为每个 card/list 图块分配一个复选框,具有选中/取消选中功能。

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:flutter_application_http_get/example.dart';
import 'package:flutter_application_http_get/screen.dart';
import 'package:flutter_application_http_get/sunday_state.dart';
import 'package:http/http.dart' as http;

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Sunday(),
    );
  }
}

这是我的 ApI 获取方法

class Sunday extends StatefulWidget {
  const Sunday({Key? key}) : super(key: key);

  @override
  _SundayState createState() => _SundayState();
}

class _SundayState extends State<Sunday> {
  var users = [];
  Future getUserData() async {
    var res =
        await http.get(Uri.https("jsonplaceholder.typicode.com", "users"));
    var jsonData = jsonDecode(res.body) as List;

    setState(() {
      users = jsonData;
    });
  }

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

这是我的构建方法

 Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("User Data"),
      ),
      body: Container(
        child: Card(
          margin: EdgeInsets.all(20.0),
          child: ListView.builder(
              itemCount: users.length,
              itemBuilder: (context, i) {
                final post = users[i];

                return Card(
                    elevation: 5,
                    child: Padding(
                        padding: const EdgeInsets.all(12.0),
                        child: ListView(shrinkWrap: true, children: [
                          // singlecheckbox(notification),
                          ...notification.map(singlecheckbox).toList(),
                          Text("${post['id']}"),
                          Text("${post['name']}"),
                          
                        ])

这是我用来切换复选框的小部件

final notification = [SundayCheckBoxState()];
void togglegroupcheckbox(bool? value) {
    if (value == null) return;
    setState(() {
      // notification.value = value;
      notification.forEach((element) => element.value = value);
    });
  }

  Widget singlecheckbox(SundayCheckBoxState checkbox) {
    return CheckboxListTile(
      controlAffinity: ListTileControlAffinity.leading,
      activeColor: Colors.green,
      value: checkbox.value,
      // title: Text('${users.last['name']}'),
      onChanged: togglegroupcheckbox,

      
    );

有很多选项,其中之一是使用 ListTile 并在每行的开头(或末尾)添加 CheckBox。您也必须跟踪每个复选框的状态,例如在您的 users 列表中。

尝试这样定义您的 ListView.builder

ListView.builder(
  itemCount: users.length,
  itemBuilder: (context, i) {
    final post = users[i];

    return Card(
        elevation: 5,
        child: Padding(
            padding: const EdgeInsets.all(12.0),
            child: ListView(shrinkWrap: true, children: [
              // singlecheckbox(notification),
              //...notification.map(singlecheckbox).toList(),
              ListTile(
                  isThreeLine: true,
                  leading: Checkbox(
                    value: post["checked"] ?? false,
                    onChanged: (bool? value) {
                      setState(() {
                        post["checked"] = value;
                      });
                    },
                  ),
                  title: Text(
                      "${post['name']}\n${post['company']['name']}"),
                  subtitle: Text("${post['email']}"),
                  trailing: Text("${post['username']}"))
            ])));
  })