Recent questions tagged dart

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dart - How to get the full stack trace for async execution

For a small example like import 'dart:async'; import 'package:stack_trace/stack_trace.dart'; void main() { ... get the full stack trace? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.0k views

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dart - Set height of DropdownButtonFormField list

In Flutter, DropdownButtonFormField's modal list keeps growing to fill some height limit that seems to be ~90% of the screen ( ... ], ), )), ); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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791 views

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dart - What color system does flutter use and why do we use `const Color` instead of `new Color`

Today I came over following snippet of code that implements gradient in flutter return new Container( ... decoration: ... .clamp also a const? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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dart - How to Pick files and Images for upload with flutter web

I would like to know how to pick an Image from the users computer into my flutter web app for upload See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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891 views

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dart - How do I call async property in Widget build method

I'm new to Flutter and Dart, and I'm trying to build a Flutter app which displays the device information on the screen. For ... '), ), ), ); } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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925 views

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dart - How do you change the value inside of a textfield flutter?

I have a TextEditingController where if a user clicks a button it fills in with information. I can't seem ... . Is there a solution? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter Drawer Widget - change Scaffold.body content

When using the Flutter Scaffold.Drawer - is it possible to have the links in the Drawer change the content ( ... change a Fragment in Android. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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959 views

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dart - Listview with scrolling Footer at the bottom

I'm trying to create a scrolling list widgets which takes displays a few items and has the ability to add a ... here but with Flutter of course. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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846 views

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dart - How to flatten a List?

How can I easily flatten a List in Dart? For example: var a = [[1, 2, 3], ['a', 'b', 'c'] ... e. into a single List containing all those values? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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898 views

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dart - Flutter is not able to install the apk into the real device suddenly

I am working with flutter currently and everything was fine suddenly when I uninstalled the app from the ... reinstalling after uninstalling. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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678 views

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dart - Trigger a function from a widget to a State object

This is a simplified version of the scenario: class ParentWdiegt extends StatelessWidget{ // // ... without using InheritedWidget? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Permanent view with navigation bar in Flutter

I have a scenario where I have 2 views: View 1 View 2 On a button press from View 1, Navigator.of ... the screen right below the ContainerView See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Google map in Flutter not responding to touch events

I got two different screens inside Flutter app that use Google Map (provided by this library). Widget structure ... to any touch events. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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958 views

1 answer

dart - How can I merge multiple Streams into a higher level Stream?

I have two streams, Stream<A> and Stream<B>. I have a constructor for a type C that takes an A and a B. ... the two Streams into a Stream<C>? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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768 views

1 answer

dart - Unable to make calls to Localhost using Flutter, random port being assigned to HTTP GET call

I'm attempting to build a Flutter app where I'm required to make an HTTP call using the dart http library. So ... my phone directly (One Plus 3) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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884 views

1 answer

dart - Setting environment variables in Flutter

For example, building a client for an API, like Twitch. In a Dart CLI binary, I could use a generic environment ... once I figure out how :) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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970 views

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dart - How to listen focus change in flutter?

In Android, we can call setOnFocusChangeListener(), do something in onFocusChanged() method, but flutter does not provider ... give me a hand? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

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dart - Getting type 'List<dynamic>' is not a subtype of type 'List<...>' error in JSON

I'm decoding a response body and I'm getting the error: 'List<dynamic>' is not a subtype of type 'List<Example> ... catchError((e)=>print(e)); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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dart - How to remove hash (#) from URL in Flutter web

The default URL of a Flutter web project defines a URL containing a hashtag (#), as follows: http://localhost: ... How can I solve this problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.0k views

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dart - Flutter Navigator.pop(context) returning a black screen

My Flutter Project structure is like this Main() //Run App with MaterialApp and Routes L HomePage() //Default ... think it is the problem. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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764 views

1 answer

dart - How to request and check permissions in Flutter

I am using a various plugin to get user data, contact, photos and camera when the user clicks Don't allow ... user permission again in flutter? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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900 views

1 answer

dart - How do I check if the Flutter application is in the foreground or not?

I don't want to show notification when the app is in foreground. How can I check live state of my app? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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866 views

1 answer

dart - how to place a listview inside a SingleChildScrollView but prevent them from scrolling separately?

I have a widget tree like this: SingleChildScrollView Column Container ListView(or GridView) the problem is that when my ... I can achieve it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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703 views

1 answer

dart - how to access an object created in one stateful widget in another stateful widget in flutter

I am stuck in my project where I have two stateful widgets created in flutter as two different dart files. Now, I have to ... ], ), ), ); } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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956 views

1 answer

dart - Display SnackBar in Flutter

I want to display a simple SnackBar inside Flutter's stateful widget. My application creates new instance of MaterialApp with ... value) )); } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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721 views

1 answer

dart - How to build a complex Web UI application with multiple views?

I am going to build complex application having many different views. Imagine for example eshop solution. There can be ... , how to achieve this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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925 views

1 answer

dart - Flutter persistent navigation bar with named routes?

I've been searching around for a good navigation/router example for Flutter but I have not managed to find ... satisfy all these requirements? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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990 views

1 answer

dart - Flutter floating action button with speed dial

Is there any ready made widget or where to get started floating action button with speed dial actions in Flutter. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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