如何获取apiRequest方法的返回值？这个函数在外面创建FutureapiRequest(Stringurl,MapjsonMap)async{HttpClienthttpClient=HttpClient();HttpClientRequestrequest=awaithttpClient.postUrl(Uri.parse(url));request.headers.set('content-type','application/json');request.add(utf8.encode(json.encode(jsonMap)));HttpClientResponseres
如何获取apiRequest方法的返回值？这个函数在外面创建FutureapiRequest(Stringurl,MapjsonMap)async{HttpClienthttpClient=HttpClient();HttpClientRequestrequest=awaithttpClient.postUrl(Uri.parse(url));request.headers.set('content-type','application/json');request.add(utf8.encode(json.encode(jsonMap)));HttpClientResponseres
大家好，我是Flutter和异步编程的新手。我需要做这样的事情:ListusersProfiles=[];getUsers('DcofOiHWcjbjD0i18miW').then((user){user.forEach((u){usersProfiles.add(newListTile(leading:CircleAvatar(backgroundImage:AssetImage(u.profilePicture),),trailing:u.icon,title:newText(u.name),onTap:(){Navigator.push(context,newMaterialPa
大家好，我是Flutter和异步编程的新手。我需要做这样的事情:ListusersProfiles=[];getUsers('DcofOiHWcjbjD0i18miW').then((user){user.forEach((u){usersProfiles.add(newListTile(leading:CircleAvatar(backgroundImage:AssetImage(u.profilePicture),),trailing:u.icon,title:newText(u.name),onTap:(){Navigator.push(context,newMaterialPa
这发生在我的主应用程序中和我用给定的代码实验室复制它:https://codelabs.developers.google.com/codelabs/flutter-firebase/index.html?index=..%2F..index#10import'package:cloud_firestore/cloud_firestore.dart';import'package:flutter/material.dart';voidmain()=>runApp(MyApp());classMyAppextendsStatelessWidget{@overrideWidgetbuild
这发生在我的主应用程序中和我用给定的代码实验室复制它:https://codelabs.developers.google.com/codelabs/flutter-firebase/index.html?index=..%2F..index#10import'package:cloud_firestore/cloud_firestore.dart';import'package:flutter/material.dart';voidmain()=>runApp(MyApp());classMyAppextendsStatelessWidget{@overrideWidgetbuild
一旦String的Stream发送一个新的String，我想显示一个SnackBar。我试图在StatefulWidget中放置一个StreamBuilder，以便能够调用Scaffold.of()(因为它是另一个上下文现在)。但后来我得到这个错误:ThefollowingassertionwasthrownbuildingStreamBuilder(dirty,state:_StreamBuilderBaseState>#7f258):setState()ormarkNeedsBuild()calledduringbuild.ThisScaffoldwidgetcannotbemar
一旦String的Stream发送一个新的String，我想显示一个SnackBar。我试图在StatefulWidget中放置一个StreamBuilder，以便能够调用Scaffold.of()(因为它是另一个上下文现在)。但后来我得到这个错误:ThefollowingassertionwasthrownbuildingStreamBuilder(dirty,state:_StreamBuilderBaseState>#7f258):setState()ormarkNeedsBuild()calledduringbuild.ThisScaffoldwidgetcannotbemar
flutter文档中并没有给出明确的解释，对于刚接触Flutter的人来说会比较难理解。https://flutter.dev/docs/development/ui/layout#non-material-apps和https://flutter.dev/docs/development/ui/layout#non-material-apps非Material应用程序和Material应用程序之间有什么区别，以及构建它的概念是什么。展望future，我如何决定“我的这部分flutter代码是在Material应用程序中还是在非Material应用程序中”？Whatisthediffe
flutter文档中并没有给出明确的解释，对于刚接触Flutter的人来说会比较难理解。https://flutter.dev/docs/development/ui/layout#non-material-apps和https://flutter.dev/docs/development/ui/layout#non-material-apps非Material应用程序和Material应用程序之间有什么区别，以及构建它的概念是什么。展望future，我如何决定“我的这部分flutter代码是在Material应用程序中还是在非Material应用程序中”？Whatisthediffe
