How To Create Nest Stream Builder Using Flutter Android App

import 'package:flutter/material.dart';

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

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

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

class _MyHomePageState extends State<MyHomePage> {
  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(
      backgroundColor: Colors.black,
        appBar: AppBar(
            backgroundColor: Colors.pink[800],
            title: Text("Nest Stream Builder"
            )),
      body: Center(
        child: StreamBuilder<int>(
          stream: timedCounter(Duration(seconds: 2), 40),
          builder: (context, snapshot) {
            if (!snapshot.hasData) {
              return Text("No data");
            }
            int firstCount = snapshot.data;
            return StreamBuilder(
                stream: timedCounter(Duration(seconds: 1), 45),
                builder: (context, snapshot) {
                  if (!snapshot.hasData) {
                    return Text("No data");
                  }
                  int secondCount = snapshot.data;
                  return Text(
                      "First Count: $firstCount, Second Count: $secondCount",
                      style: TextStyle(
                        fontSize: 20,
                        fontWeight: FontWeight.bold,
                        color: Colors.lightGreen
                      ));
                });
          },
        ),
      ),
    );
  }
}