Flutter中的嵌套streambuilder和快照

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Nested StreamBuilder Example')),
        body: NestedStreamBuilder(),
      ),
    );
  }
}

class NestedStreamBuilder extends StatelessWidget {
  final Stream<int> stream1 = Stream.periodic(Duration(seconds: 1)).map((_) => 1);
  final Stream<int> stream2 = Stream.periodic(Duration(seconds: 2)).map((_) => 2);

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        StreamBuilder<int>(
          stream: stream1,
          builder: (context, snapshot) {
            if (snapshot.hasData) {
              return Text('Stream 1: ${snapshot.data}');
            } else {
              return CircularProgressIndicator();
            }
          },
        ),
        StreamBuilder<int>(
          stream: stream2,
          builder: (context, snapshot) {
            if (snapshot.hasData) {
              return Text('Stream 2: ${snapshot.data}');
            } else {
              return CircularProgressIndicator();
            }
          },
        ),
      ],
    );
  }
}