GetX DropdownMenu

 import "package:flutter/material.dart";

import "package:get/get.dart";

void main() {
  runApp(MyApp(),);
}
class MyApp extends StatelessWidget {
  MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return GetMaterialApp(
      debugShowCheckedModeBanner: false,
      title: "Drop Down Menu",
      theme: ThemeData(
        primarySwatch: Colors.grey,
      ),
      home: DropDownDemo(),
    );
  }
}
class DropDownDemo extends StatefulWidget {
  DropDownDemo({super.key});

  @override
  State<DropDownDemo> createState() => _DropDownDemoState();
}

class _DropDownDemoState extends State<DropDownDemo> {

  String dropdownValue = "Red";

  List<String> listItem = <String>[
    "Red", "Green", "Orange", "Blue", "Black", "Brown", "White", "Silver"
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Drop Down Demo"),
        centerTitle: true,
      ),
      body: Center(
        child: DropdownButton(
          dropdownColor: Colors.grey.shade400,
          value: dropdownValue,
          items: listItem.map<DropdownMenuItem<String>>(
                (String value) {
                  return DropdownMenuItem<String>(
                    value: value,
                    child: Text(value),
                  );
                },
          ).toList(),
          onChanged: (String? newValue) {
            setState(() {
              dropdownValue = newValue!;
            },);
          },
        ),
      ),
    );
  }
}