有没有办法暂停streambuilder并以编程方式启动它

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

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

class MyApp extends StatelessWidget {
  final StreamController<bool> _streamController = StreamController<bool>();

  void pauseStream() {
    _streamController.pause();
  }

  void startStream() {
    _streamController.resume();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('StreamBuilder Example'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              StreamBuilder<bool>(
                stream: _streamController.stream,
                builder: (context, snapshot) {
                  if (snapshot.hasData && snapshot.data == true) {
                    return Text('Stream is active');
                  } else {
                    return Text('Stream is paused');
                  }
                },
              ),
              SizedBox(height: 20),
              RaisedButton(
                onPressed: pauseStream,
                child: Text('Pause Stream'),
              ),
              RaisedButton(
                onPressed: startStream,
                child: Text('Start Stream'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}