How To Change Icon Color Popup Menu Button In Flutter App

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:badges/badges.dart';

void main() => runApp(BadgesApp());

class BadgesApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'APP',
      home: ChangeIconColorPopupMenu(),
    );
  }
}

class ChangeIconColorPopupMenu extends StatefulWidget {
  @override
  ChangeIconColorPopupMenuState createState() {
    return new ChangeIconColorPopupMenuState();
  }
}
class ChangeIconColorPopupMenuState extends State<ChangeIconColorPopupMenu> {
  List<Color> _colors = [
    Colors.indigo,
    Colors.orange,
    Colors.teal,
    Colors.brown,
    Colors.pink
  ];
  int _ColorIndex = 1;
  _onChanged() {
    int _colorCount = _colors.length;
    setState(() {
      if (_ColorIndex == _colorCount - 1) {
        _ColorIndex = 0;
      } else {
        _ColorIndex += 1;
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          backgroundColor: Colors.deepPurple,
          title: Text("Change PopupMenuButton Icon color"),
          actions: [
            IconButton(icon: Icon(Icons.notifications), onPressed: (){})
          ],
        ),
        body: Column(
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          mainAxisSize: MainAxisSize.max,
          children: <Widget>[
            Center(
              child: Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  PopupMenuButton(
                    icon: Icon(Icons.settings, color: _colors[_ColorIndex]),
                    itemBuilder: (context) => [
                      PopupMenuItem(
                        child: Row(
                          children: <Widget>[
                            Icon(Icons.home,
                                color: _colors[_ColorIndex]),
                            SizedBox(width: 10.0),
                            Text("Account"),
                          ],
                        ),
                      ),
                      PopupMenuItem(
                        child: Row(
                          children: <Widget>[
                            Icon(Icons.lock, color: _colors[_ColorIndex]),
                            SizedBox(width: 10.0),
                            Text("Change Password"),
                          ],
                        ),
                      ),
                      PopupMenuItem(
                        child: Row(
                          children: <Widget>[
                            Icon(Icons.exit_to_app,
                                color: _colors[_ColorIndex]),
                            SizedBox(width: 10.0),
                            Text("Sign Out"),
                          ],
                        ),
                      ),
                    ],
                  ),
                  SizedBox(width: 10.0),
                  Text("Change Icon Color")
                ],
              ),
            ),
            Expanded(
              child: Center(
                child: RaisedButton(
                  onPressed: _onChanged,
                  child: Text("Change Icon Color PopupMenuButton", style: TextStyle(color: Colors.white),),
                  color: Colors.deepPurple,
                ),
              ),
            )
          ],
        ));
  }
}