Recent questions tagged flutter

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flutter - How to disable "Run|Debug" line in vscode?

I am currently using Flutter with Dart. How do I permanently disable this annoying "Run|Debug" line in vscode? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Dart Future.wait for multiple futures and get back results of different types

I'm using Flutter to download 3 different sets of data from a server, then do something with all 3 sets. I could do this: List<Foo> foos = ... What's the best alternative way to achieve this? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Is it possible to modify the reference of an argument in Dart?

Not sure if the terminology in the title is 100% correct, but what I mean is easily illustrated by this example: class MyClass{ String str = ''; MyClass(this ... Is this possible in Dart, and if so, how? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Firebase OnDisconnect Event

so the question is about onDisconnect in firebase, I am implementing a chatapp like whatsapp in flutter and using Firebase, stuck at this point the onDisconnect event takes ... print('here I am ')); } }); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter web - How to get the file selected

I am building a flutter web using old version. I am having a FileUploadInputElement. I need to get the file selected from that element. @override Widget build( ... : 'animation-Image-html', ), ); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Firebase always reads from internet

As I know Firebase on Flutter will automatically read from cache first but I noticed while development that an app just play around with almost 1 stream ... , listen: false) .userListsStream(uid); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Overflowing text does not wrap

I am trying to display a very long text but it doesn't wrap to next line. I have searched for the solution on the internet and found that ... solved the issue, now everything wraps nice and clean. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - How to set "z-index" of canvas elements?

So I got this painter to draw a minimap for my game: class MiniMapPainter extends CustomPainter { final GameMap map; final double tileSize; final List<ui. ... rectangles if possible. How can I do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - How to prevent iOS 14 Widget opening app and react to callback

So, I already read several blogs, posts, and Apple's own Human Interface Guidelines that iOS 14 Widgets are NOT interactive, BUT: It's possible to pass a ... my stuff in SwiftUI. Thanks a lot, guys :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - How to get firestore document ID from document snapshot?

QuerySnapshot querySnapshot = await _collectionRef .limit(1) .orderBy('date') .getDocuments(); var list = querySnapshot.documents; querySnapshot.documents.map(( ... What is the mistake in the code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - TextInputType.numberWithOptions doesn't show comma or dot

TextInputType.numberWithOptions(decimal: true), I'm using the above code as a keyboardType in my TextFormField but in some devices, the device doesn't display ... is needed instead of period (Only iOS) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter delete item from listview

I tried to do the Write Your First Flutter App, part 2 flutter app page 5 I now have a question for this application. I want to remove an entry from that List ... (children: divided), ); }, ), ); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Pageview display grey screen when in release mode

He everyone, I have an issue with the following code: import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends ... and displays a grey screen. Any help is appreciated! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - error: Null check operator used on a null value

In this, when the uniq_id of the button and the uniq_id of the data table match, only then the data of the user of that uniq_id will show ... Ashutodh","user_mother_name":"manju1","user_address":"Mirzapur1","user_mobile":"2222221","user_spo...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Container borderRadius vs ClipRRect borderRadius

Both Container and ClipRRect has borderRadius property, but sometimes Container fail to work. Here is the example. Not working Container( decoration: ... sometimes and where else it can fail? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Localizations without calling `of(context)` every time

I find the localization procedure using the official Flutter localization plugin cumbersome. To display a localized string I have to call Localization.of( ... way to make the localization less cumbersome? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - How to convert time stamp string from 24 hr format to 12 hr format in dart?

I am working on flutter application where i have to show time stamps but the response i got from api is in 24 hr format and i want to display time in ... way of doing the formatting from 24 hr to 12 hr? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - What difference between stateless and stateful widgets?

I am learning Dart/flutter and trying to understand how Widgets system works. But I can't understand what difference between stateless and stateful widgets? ... if I will create not proper Widget type? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Optimal way to make multiple independent requests to server in Dart

I want to make to multiple requests to same server in an optimal way. So I have Future<List<Item>> getAllItems() async { var client = new http.Client ... to implement so as to avoid the async await hell? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - What is the difference between ListView and ListView.builder and can we use Listview.builder to create and validate and submit forms?

What is the difference between Listview.builder and Listview? Can we use ListView.builder to submit forms? I am using the Listview.builder now to create forms. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - How to remove trailing zeros using Dart

I would like the optimal solution for removing trailing zeros using Dart. If I have a double that is 12.0 it should output 12. If I have a double that is 12.5 it should output 12.5 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - How do I split or chunk a list into equal parts, with Dart?

Assume I have a list like: var letters = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']; I would like a list of lists of 2 elements each: var chunks = ... , ['g', 'h']]; What's a good way to do this with Dart? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Allowing a widget to overflow to another widget

I was trying to achieve an effect of allowing a widget to overflow to another widget as seen here The code I've this far is this: @override Widget ... by the container. Is there another approach to this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.2k views

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flutter - How to access Provided (Provider.of()) value inside showModalBottomSheet?

I have a FloatingActionButton inside a widget tree which has a BlocProvider from flutter_bloc. Something like this: BlocProvider( builder: (context) { ... 56533611/2457045 solution to Modal Bottom Sheet? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.1k views

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flutter - How to fix this nullOk error when using the flutter_svg package?

I connected the package, added it to main.dart, I try to compile the application, but I get this error. Help! What should I do about it? ... Exception: Gradle task assembleDebug failed with exit code 1 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

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flutter - WebView support for FlutterWeb for plugin development

Hi I developed a Flutter Plugin flutter_tex. It's based on the WebView. How do I add Flutter Web support for this?? I tried this example to show ... build failed. FAILURE: Build failed with an exception. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.9k views

1 answer

flutter - adb.exe has stopped working with Android Studio 4.3.1 and Android 9.+

With the latest clean installation of Android Studio with all the recommended settings I have this continuous error when I try to start an emulated device. The ... version 1.0.41 Version 29.0.0-5611747 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - How to post data to https server in dart?

So i was building an application in flutter and I came across a problem. I need to post JSON data to a https server. Since the application is ... Dart please help me out. Suggestions will be welcomed. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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