HOW TO CHANGE THE BACKGROUND COLOR OF RAISED BUTTON DYNAMICALLY IN ONPRESSED()-FLUTTER

import 'package:flutter/src/foundation/key.dart';
import 'package:flutter/src/widgets/framework.dart';

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:holidaylandmark/main.dart';
import 'package:intl/intl.dart';


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

  @override
  State<Experiment> createState() => _ExperimentState();
}
class _ExperimentState extends State<Experiment> {
  final globalTheme = ThemeData(
  primarySwatch: Colors.deepOrange,
  textTheme: const TextTheme(
    bodyText1: TextStyle(
      fontSize: 22,
      height: 1.2,
    ),
    bodyText2: TextStyle(
      color: Colors.blue,
      fontSize: 20,
      fontWeight: FontWeight.bold,
      height: 1.0,
    ),
    caption: TextStyle(
      fontSize: 16,
      fontWeight: FontWeight.bold,
      fontStyle: FontStyle.italic,
      height: 1.2,
    ),
    headline1: TextStyle(
      color: Colors.deepOrange,
      fontFamily: 'Allison',
      fontWeight: FontWeight.bold,
      fontSize: 60,
    ),
    headline2: TextStyle(
      color: Colors.black38,
      fontSize: 30,
      fontWeight: FontWeight.bold,
    ),
  ),
  appBarTheme: const AppBarTheme(
    backgroundColor: Colors.amber,
    // This will control the "back" icon
    iconTheme: IconThemeData(color: Colors.red),
    // This will control action icon buttons that locates on the right
    actionsIconTheme: IconThemeData(color: Colors.blue),
    centerTitle: false,
    elevation: 15,
    titleTextStyle: TextStyle(
      color: Colors.deepPurple,
      fontFamily: 'Allison',
      fontWeight: FontWeight.bold,
      fontSize: 40,
    ),
  ),
);
   bool _flag = true;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        //  backgroundColor:globalTheme.backgroundColor,
          title: Text(
            'holidaylandmark',
            style: TextStyle(
              fontSize: 23.0,
            ),
          ),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () => setState(() => _flag = !_flag),
          child: Text(_flag ? 'Red' : 'Green'),
          style: ElevatedButton.styleFrom(
            primary: _flag ? Colors.red : Colors.teal, // This is what you need!
          ),
        ),
      ),
    );
  }
}

class _MyState extends State<MyPage> {
  bool _flag = true;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: ElevatedButton(
          onPressed: () => setState(() => _flag = !_flag),
          child: Text(_flag ? 'Red' : 'Green'),
          style: ElevatedButton.styleFrom(
            primary: _flag ? Colors.red : Colors.teal, // This is what you need!
          ),
        ),
      ),
    );
  }
}

List<bool> _list = [true, false, true, false];

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(title: Text("Title")),
    body: ListView(children: _buildButtons()),
  );
}

List<Widget> _buildButtons() {
  List<Widget> listButtons = List.generate(_list.length, (i) {
    return RaisedButton(
      color: _list[i] ? Colors.green : Colors.red,
      onPressed: () {
        setState(() {
          _list[i] = !_list[i];
        });
      },
      child: Text("Button #${i}"),
    );
  });
  return listButtons;
}

List<Widget> _createButton(BuildContext context, List<Zone> zones) {
    return zones.map((Zone zone) {
      return RaisedButton(
        onPressed: () {
          setState(() {
            if (!zone.isSelected) {
              zone.color = AppColors.white;
            }
          });
        },
        color: zone.color ??= Theme.of(context).primaryColor,
        child: Text(zone.text),
      );
    }).toList();
  }

bool isButtonPressed = false;

RaisedButton(
            color: isButtonPressed ? Colors.green : Colors.red,
            onPressed: () {
              setState(() {
                isButtonPressed =!isButtonPressed;
              });
            },
          ),