Recent questions tagged Dart

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dart - Style BottomNavigationBar in Flutter

I am trying out Flutter and I am trying to change the colour of the BottomNavigationBar on the app but all I could ... new FirstScreen(), ); } } See Question&Answers more detail:os...

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

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936 views

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dart - Not able to change TextField Border Color

I am trying to change color of the border of my TextField using a BorderSide, but it does not work. This is ... of the result is shown below. See Question&Answers more detail:os...

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

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1.1k views

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dart - How to run code after some delay in Flutter?

I'd like to execute a function after a certain delay after my Widget is built. What's the idiomatic way ... style property after some duration. See Question&Answers more detail:os...

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

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1.1k views

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dart - How to Move bottomsheet along with keyboard which has textfield(autofocused is true)?

I'm trying to make a bottomsheet that has a text field and autofocus is set to true so that the keyboard pops up ... , maxLines: 4, ),]); 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 - Horizontally scrollable cards with Snap effect in flutter

I want to create a list of cards scrolling horizontally with snap to fit effect when swiped either from left or right. Each ... , ), ), ); } } See Question&Answers more detail:os...

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

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1.1k views

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dart - How can I add shadow to the widget in flutter?

How can I add shadow to the widget like in the picture below? This is my current widget code. See Question&Answers more detail:os...

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

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844 views

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dart - How to create Toast in Flutter

Can I create something similar to Toasts in Flutter? Just a tiny notification window that is not directly in the ... fade the view behind 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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841 views

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dart - forEach vs for in: Different Behavior When Calling a Method

I noticed that forEach and for in to produce different behavior. I have a list of RegExp and want to run ... different results. Why is 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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780 views

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dart - Refer classes by their metadata tag

Is it possible to find(probably with the mirror API) all classes(in my project) with some metadata ... = getClassMirrorsByTag(#foo); } 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 - Multiple widgets used the same GlobalKey

I'm using Flutter. I have a simple app with 3 tabs. There is a RefreshIndicator in each tab with a ListView. ... times. Thank you for any help. See Question&Answers more detail:os...

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

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916 views

1 answer

dart - Usage of FutureBuilder with setState

How to use the FutureBuilder with setState properly? For example, when i create a stateful widget its starting to load data ( ... ; } }, ); } } 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 - Flutter: There should be exactly one item with [DropdownButton]'s value

I am trying to create a dropdown button in Flutter. I am getting a List from my database then I pass the list ... to get my List from database. See Question&Answers more detail:os...

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

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1.9k views

1 answer

dart - Invalid Arabic characters With Utf-8 charset Retrived with http.get Flutter

Hi i'm trying to Fetch data from the internet in flutter and as long as all characters in response.body are ... the text in a text widget: See Question&Answers more detail:os...

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

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1.4k views

1 answer

dart - Flutter Navigator not working

I have app with two screens, and I want to make push from 1st to second screen by pressing button. Screen 1 ... a Navigator. What is wrong? See Question&Answers more detail:os...

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

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950 views

1 answer

dart - Does using const in the widget tree improve performance?

When creating a widget tree, will inserting const before static widgets improve performance? ie child: const Text( ... Thanks for your answers! 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

1 answer

dart - Flutter camera appears stretched

I've been playing around with flutter an i'm loving it so far, but I'm having an issue getting the ... stretched but still fills 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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1.2k views

1 answer

dart - How can we change appbar background color in flutter

I am trying to set a common theme for app so I need to change appbar color as a color that indicates hex code ... can I do this from themeData? See Question&Answers more detail:os...

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

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771 views

1 answer

dart - How to schedule background tasks in Flutter?

I have been looking a lot for this but haven't found any packages or a way to schedule background tasks ... to schedule background tasks). See Question&Answers more detail:os...

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

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978 views

1 answer

dart - How to use InputFormatter on Flutter TextField?

What do I need to insert into TextField(inputFormatters:? I want to disallow and / in one TextField and only allow a to Z in another. See Question&Answers more detail:os...

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

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1.4k views

1 answer

dart - flutter run function every x amount of seconds

inside my flutter app I want to check my api every 10 seconds. I found this post to run a function every x ... anybody know how to fix this? See Question&Answers more detail:os...

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

0 votes

1.7k views

1 answer

dart - Flutter: How to get upload / download progress for http requests

I am writing an app that uploads an image to a server, and instead of just showing a spinner, I'd love to ... with current dart / flutter APIs? See Question&Answers more detail:os...

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

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911 views

1 answer

dart - How do I crop an image in Flutter?

Let's say I have a rectangular, portrait image: I'd like to crop it, such that it's rendered like this: How ... from https://flic.kr/p/nwXTDb) See Question&Answers more detail:os...

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

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1.1k views

1 answer

dart - how to convert an image to base64 image in flutter?

I am actually trying to convert an image picked by ImagePicker in flutter to base64 image. I am always getting ... mistake . Many thanks, Mahi See Question&Answers more detail:os...

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

0 votes

1.1k views

1 answer

dart - Formatting a Duration like HH:mm:ss

Is there a good way to format a Duration in something like hh:mm:ss, without having to deal with time zones? I ... I get this: 0:00:00.000000 See Question&Answers more detail:os...

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

0 votes

797 views

1 answer

dart - Flutter, render widget after async call

I would like to render a widget that needs an HTTP call to gather some data. Got the following code (simplified ... the widget does not update. See Question&Answers more detail:os...

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

0 votes

960 views

1 answer

dart - Creating Image Carousel in Flutter

How can i create an Carousel of Containers Like the example below? I looked at Pageview class but this only displays ... how i can fix this? See Question&Answers more detail:os...

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

0 votes

762 views

1 answer

dart - how to create toolbar searchview in flutter

i need to implement searchview in toolbar my app to achieve list view list filter. like below image, i searched ... , thank you in advance. See Question&Answers more detail:os...

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

0 votes

922 views

1 answer

dart - Flutter: Setting the height of the AppBar

How can I simply set the height of the AppBar in Flutter? The title of the bar should be staying centered vertically (in that AppBar). See Question&Answers more detail:os...

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

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