我有一个StreamBuilder和一个int来增加数字，我使用setState函数。问题是StreamBuilder总是在每次setState发生时获取新数据，无论如何都要使StreamBuilder在每次setState发生时不受setState的影响。总结一下，每次使用setstate时，停止StreamBuilder从后端获取新数据

完整代码

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_storage/firebase_storage.dart';
import 'package:flutter/material.dart';

class StreamBuildTest2 extends StatefulWidget {
  const StreamBuildTest2({super.key});

  @override
  State<StreamBuildTest2> createState() => _StreamBuildTest2State();
}

class _StreamBuildTest2State extends State<StreamBuildTest2> {
  String userUid = FirebaseAuth.instance.currentUser!.uid;
  final FirebaseStorage storage = FirebaseStorage.instance;
  //Variable to increment number
  int number = 0;
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      //The StreamBuilder that’s getting new data every time setState accur 
      body: StreamBuilder<DocumentSnapshot>(
        stream: FirebaseFirestore.instance
            .collection('users')
            .doc(userUid)
            .snapshots(),
        builder: (context, snapshot) {
          //Data from firebase backend
          var fullName = snapshot.data?.get('fullName');
          var email = snapshot.data?.get('email');
          var profileUrl = snapshot.data?.get('profileUrl');
          //
          if (snapshot.connectionState == ConnectionState.waiting) {
            return Container();
          }
          return Column(
            children: [
              //To get user profile
              FutureBuilder(
                future: downloadURL(profileUrl),
                builder:
                    (BuildContext context, AsyncSnapshot<String> snapshot) {
                  if (snapshot.connectionState == ConnectionState.done &&
                      snapshot.hasData) {
                    return SizedBox(
                      height: 110,
                      width: 110,
                      child: FittedBox(
                        fit: BoxFit.contain,
               //The user profile always getting new data every time setState accur
                        child: CircleAvatar(
                          backgroundColor: Colors.transparent,
                          backgroundImage: NetworkImage(snapshot.data!),
                          radius: 10.0,
                        ),
                      ),
                    );
                  }
                  if (snapshot.connectionState == ConnectionState.waiting ||
                      snapshot.hasData) {
                    return Container();
                  }
                  return Container();
                },
              ),
              Text(fullName),
              Text(email),
              Text(number.toString()),
             //Here’s the setState
              ElevatedButton(
                onPressed: () => setState(() {
                  number += 1;
                }),
                style: ElevatedButton.styleFrom(
                  foregroundColor: Colors.black,
                  backgroundColor: Colors.grey,
                  elevation: 0.0,
                  shape: const RoundedRectangleBorder(
                    borderRadius: BorderRadius.zero,
                  ),
                ),
                child: const Text('SetState Button'),
              ),
            ],
          );
        },
      ),
    );
  }
 //Doesn’t matter here
  Future<String> downloadURL(String file) async {
    try {
      String downloadURL =
          await storage.ref('usersProfile/$file').getDownloadURL();
      print(downloadURL);
      return downloadURL;
    } on FirebaseException catch (e) {
      print(e);
    }
    return downloadURL(file);
  }
}

随意修改我的代码
问题

offsetNotifier可以更改，但当我使用onPanUpdate: _offsetNotifier,时，我不希望FutureBuilder也更改

final ValueNotifier<Offset> offsetNotifier = ValueNotifier(const Offset(0, 0));

void _offsetNotifier(DragUpdateDetails details) => offsetNotifier.value += details.delta;

   ValueListenableBuilder(
          valueListenable: offsetNotifier,
           builder: (_, value, __) {
              return Positioned(
                  left: offsetNotifier.value.dx,
                  top: offsetNotifier.value.dy,
                        child: FutureBuilder(
                            future: downloadURL(profileUrl),
                            builder: (BuildContext context,
                                AsyncSnapshot<String> snapshot) {
                              if (snapshot.connectionState == ConnectionState.done && snapshot.hasData) {
                                return CircleAvatar(
                                  backgroundColor: Colors.transparent,
                                  backgroundImage: NetworkImage(snapshot.data!),
                                  radius: 10.0,
                                );
                              }
                              return Container();
                            }),
                      );
                    }),

 Future<String> downloadURL(String file) async {
    try {
      String downloadURL =
          await storage.ref('widgetsProfile/$file').getDownloadURL();
      print(downloadURL);
      return downloadURL;
    } on FirebaseException catch (e) {
      print(e);
    }
    return downloadURL(file);
  }
}