How To Reload Or Refresh Stream Builder Using Flutter App

import 'package:flutter/material.dart';

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

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

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  Stream<int> myStream;

  @override
  void initState() {
    super.initState();
    myStream = timedCounter(Duration(seconds: 1), 20);
  }

  Stream<int> timedCounter(Duration interval, [int maxCount]) async* {
    int i = 0;
    while (true) {
      await Future.delayed(interval);
      yield i++;
      if (i == maxCount) break;
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.pink[800],
          title: Text("Refresh Stream Builder"
          )),
      body: ListView(
        children: <Widget>[
          SizedBox(height: 50),
          Center(
            child: StreamBuilder<int>(
              stream: myStream,
              builder: (context, snapshot) {
                if (!snapshot.hasData) {
                  return Text("Loading");
                }
                return Text("${snapshot.data.toString()}",
                    style: TextStyle(fontSize: 20));
              },
            ),
          ),
          SizedBox(height: 20.0),
          RaisedButton(
            child: Text("REFRESH",style: TextStyle(color: Colors.white),),
            color: Colors.pink[800],
            onPressed: () {
              setState(() {
                myStream = timedCounter(
                    Duration(seconds: 1), 10); //refresh the stream here
              });
            },
          )
        ],
      ),
    );
  }
}