dart

问题 I'm battling an issue where I'm given the error " Object was given an infinite size during layout " and "This probably means that it is a render object that tries to be as big as possible, but it was put inside another render object that allows its children to pick their own size.". I understand what it means, but not how I can still keep my current widget tree responsive (it renders when running, so for a front-end user there seems to be no problem) while still fixing this issue. Currently I

问题 I'm battling an issue where I'm given the error " Object was given an infinite size during layout " and "This probably means that it is a render object that tries to be as big as possible, but it was put inside another render object that allows its children to pick their own size.". I understand what it means, but not how I can still keep my current widget tree responsive (it renders when running, so for a front-end user there seems to be no problem) while still fixing this issue. Currently I

问题 I'm trying to implement sign-in function with Firebase Authentication in Flutter for Web app. I can already use Firestore to store/ extract data in the same app without signing-in. When executing the app, it shows the error "NoSuchMethodError: tried to call a non-function, such as null: 'dart.global.firebase.auth'" I think the error is caused by calling auth() method. Can you please advise how I should fix it? Or, is Firebase Authentication not supported Flutter for web yet?? Imported

问题 When building Flutter apps the ALT + Enter keyboard shortcut is very convenient not only to bring up Quick Fixes but also to bring up a popup menu to wrap/remove Widgets. It was working fine until I ran flutter upgrade and updated the Dart and Flutter plugins in IntelliJ (version 2018.3.5 ). I have tried messing about with the keyboard shortcuts for an hour, disabling and re-enabling Dart/Flutter plugins, restarting and invalidating caches in IntelliJ, closing all other applications and

问题 When building Flutter apps the ALT + Enter keyboard shortcut is very convenient not only to bring up Quick Fixes but also to bring up a popup menu to wrap/remove Widgets. It was working fine until I ran flutter upgrade and updated the Dart and Flutter plugins in IntelliJ (version 2018.3.5 ). I have tried messing about with the keyboard shortcuts for an hour, disabling and re-enabling Dart/Flutter plugins, restarting and invalidating caches in IntelliJ, closing all other applications and

问题 After the flutter 1.22 update, I am getting an error in Lineargradient colors property it's giving me an error that the name colors parameter isn't defined..I am getting this error everywhere in the project after the update of flutter and flutter plugin in android studio. 回答1: Restarting your Android Studio should fix this issue. This is because in Dart 2.10, required becomes a keyword (previously was @required ). The IDE probably doesn't recognize that you've updated the Dart SDK. 回答2: run

问题 As we are having android:textAllCaps="true" feature in Android's Textview, how can we give this same feature in Text() Widget of Flutter? I know Text('Abc'.toUpperCase()) , is one way but I don't want to do it manually. Is there any property of Text() widget that converts it automatically or any widget that has similar property? 回答1: Use following function for the First word as Caps String getCapitalizeString({String str}) { if (str.length <= 1) { return str.toUpperCase(); } return '${str[0]

问题 As we are having android:textAllCaps="true" feature in Android's Textview, how can we give this same feature in Text() Widget of Flutter? I know Text('Abc'.toUpperCase()) , is one way but I don't want to do it manually. Is there any property of Text() widget that converts it automatically or any widget that has similar property? 回答1: Use following function for the First word as Caps String getCapitalizeString({String str}) { if (str.length <= 1) { return str.toUpperCase(); } return '${str[0]

问题 I am building an app which uses an api and I am using the future builder to fetch the data but the problem is when the state changes it rebuilds and I want to prevent this from happen. Thanks, 回答1: try using this : class Example extends StatefulWidget { @override _ExampleState createState() => _ExampleState(); } class _ExampleState extends State<Example> { Future<response> future; @override void initState() { future = _asyncmethodCall(); super.initState(); } @override Widget build

问题 I am building an app which uses an api and I am using the future builder to fetch the data but the problem is when the state changes it rebuilds and I want to prevent this from happen. Thanks, 回答1: try using this : class Example extends StatefulWidget { @override _ExampleState createState() => _ExampleState(); } class _ExampleState extends State<Example> { Future<response> future; @override void initState() { future = _asyncmethodCall(); super.initState(); } @override Widget build