当一个流依赖于另一个流时，如何在flutter中拥有多个应用程序智能的流？

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: StreamExample(),
    );
  }
}

class StreamExample extends StatefulWidget {
  @override
  _StreamExampleState createState() => _StreamExampleState();
}

class _StreamExampleState extends State<StreamExample> {
  StreamController<String> _streamController1;
  StreamController<String> _streamController2;

  @override
  void initState() {
    super.initState();
    _streamController1 = StreamController<String>();
    _streamController2 = StreamController<String>();
  }

  @override
  void dispose() {
    _streamController1.close();
    _streamController2.close();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Stream Example'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            StreamBuilder<String>(
              stream: _streamController1.stream,
              builder: (context, snapshot) {
                if (snapshot.hasData) {
                  return Text('Stream 1: ${snapshot.data}');
                } else {
                  return Text('Stream 1: Waiting for data...');
                }
              },
            ),
            StreamBuilder<String>(
              stream: _streamController2.stream,
              builder: (context, snapshot) {
                if (snapshot.hasData) {
                  return Text('Stream 2: ${snapshot.data}');
                } else {
                  return Text('Stream 2: Waiting for data...');
                }
              },
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          _streamController1.add('Data from Stream 1');
          _streamController2.add('Data from Stream 2');
        },
        child: Icon(Icons.add),
      ),
    );
  }
}