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import 'dart:convert'; import 'package:flutter/material.dart'; void main() { runApp(const MyApp()); } class MyApp extends StatelessWidget { const MyApp({Key? key}) : super(key: key); // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( // This is the theme of your application. // // Try running your application with "flutter run". You'll see the // application has a blue toolbar. Then, without quitting the app, try // changing the primarySwatch below to Colors.green and then invoke // "hot reload" (press "r" in the console where you ran "flutter run", // or simply save your changes to "hot reload" in a Flutter IDE). // Notice that the counter didn't reset back to zero; the application // is not restarted. primarySwatch: Colors.blue, ), home: const MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatefulWidget { const MyHomePage({Key? key, required this.title}) : super(key: key); // This widget is the home page of your application. It is stateful, meaning // that it has a State object (defined below) that contains fields that affect // how it looks. // This class is the configuration for the state. It holds the values (in this // case the title) provided by the parent (in this case the App widget) and // used by the build method of the State. Fields in a Widget subclass are // always marked "final". final String title; @override State<MyHomePage> createState() => _MyHomePageState(); } class _MyHomePageState extends State<MyHomePage> { final String _string = '''[[{ "BD Name": "Deterioration", "BD_ID": "6" }, { "BD_Name": "Diagnosis Skill", "BD_ID": "3" }, { "BD_Name": "Waiting For Man", "BD_ID": "4" }, { "BD_Name": "Waiting For Service Engineer", "BD_ID": "2" }, { "BD_Name": "Waiting for spares", "BD ID": "1" }, { "BD_Name": "Weak Design", "BD_ID": "5" }],[{ "BD Name": "Deterioration", "BD_ID": "6" }, { "BD_Name": "Diagnosis Skill", "BD_ID": "3" }, { "BD_Name": "Waiting For Man", "BD_ID": "4" }, { "BD_Name": "Waiting For Service Engineer", "BD_ID": "2" }, { "BD_Name": "Waiting for spares", "BD ID": "1" }, { "BD_Name": "Weak Design", "BD_ID": "5" }]]'''; Map<String, String> keyMap = {}; @override void initState() { getDropDownReady(); super.initState(); } List dropDownList = []; getDropDownReady() { final map = jsonDecode(_string); dropDownList = (map as List) .map((e) => (e as List).map((e) => e as Map).toList()) .toList(); dropDownValueID = dropDownList.map((e) => e[0]['BD_ID']).toList().cast(); } List<String> dropDownValueID = []; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(widget.title), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Container( color: Colors.grey, child: ListView.builder( shrinkWrap: true, itemCount: dropDownList.length, itemBuilder: (context, index) { return DropdownButton<String>( value: dropDownValueID[index], onChanged: (newValue) { setState(() { dropDownValueID[index] = newValue!; }); }, items: dropDownList[index].map<DropdownMenuItem<String>>((e) { return DropdownMenuItem<String>( value: e["BD_ID"].toString(), child: Text( e["BD_Name"] ?? "", style: const TextStyle(color: Colors.black), ), ); }).toList(), ); }, ), ) ], ), ), ); } }
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