Recent questions tagged Dart

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dart - What is initState and super.initState in flutter?

In the documentation it is written but I am not able to understand it. Called when this object is inserted into ... meaning. Can you explain it? See Question&Answers more detail:os...

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

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1.2k views

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dart - Null-aware operator with Maps

I had the same problem with lists, now it is Map. What I would like to do The following syntax is not Dart, as ... might be a good one as well. See Question&Answers more detail:os...

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

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dart - Flutter images not loaded (EXCEPTION: resolving an image codec)

When I try to run images assets doesn't get properly loaded, I am getting an exception: The following assertion was ... 27) ? No issues found! 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 answer

dart - Flutter - DropdownButton overflow

I am experimenting with Flutter, and currently trying to display an input field and a dropdown in a list view in ... shrinks to be un-legible. See Question&Answers more detail:os...

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

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1.2k views

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dart - Flutter: How to get a list of names of all images in 'assets' directory?

I have 100 images that I need to display in a list. I don't want to hard code all names. How can I get ... 'images/${fileName}.png')).toList() See Question&Answers more detail:os...

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

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1.1k views

1 answer

dart - Flutter DraggableScrollableSheet not showing up on press of a button

I want to use DraggableScrollableSheet widget on my application, when I use that like with below code, that can show without ... )); }, ), ), See Question&Answers more detail:os...

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

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942 views

1 answer

dart - Show dialog on widget

In flutter, we want to overlay a dialog above the widget. We were able to display the dialog after pushing ... not important for this question. See Question&Answers more detail:os...

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

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994 views

1 answer

dart - Show dialog on widget

In flutter, we want to overlay a dialog above the widget. We were able to display the dialog after pushing ... not important for this question. See Question&Answers more detail:os...

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

0 votes

1.1k views

1 answer

dart - Show dialog on widget

In flutter, we want to overlay a dialog above the widget. We were able to display the dialog after pushing ... not important for this question. See Question&Answers more detail:os...

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

0 votes

1.0k views

1 answer

dart - Show dialog on widget

In flutter, we want to overlay a dialog above the widget. We were able to display the dialog after pushing ... not important for this question. See Question&Answers more detail:os...

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

0 votes

1.0k views

1 answer

dart - Flutter: How to get a list of names of all images in 'assets' directory?

I have 100 images that I need to display in a list. I don't want to hard code all names. How can I get ... 'images/${fileName}.png')).toList() See Question&Answers more detail:os...

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

0 votes

1.3k views

1 answer

dart - Flutter DraggableScrollableSheet not showing up on press of a button

I want to use DraggableScrollableSheet widget on my application, when I use that like with below code, that can show without ... )); }, ), ), See Question&Answers more detail:os...

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

0 votes

982 views

1 answer

dart - Show dialog on widget

In flutter, we want to overlay a dialog above the widget. We were able to display the dialog after pushing ... not important for this question. See Question&Answers more detail:os...

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

0 votes

1.2k views

1 answer

dart - Flutter: How to get a list of names of all images in 'assets' directory?

I have 100 images that I need to display in a list. I don't want to hard code all names. How can I get ... 'images/${fileName}.png')).toList() See Question&Answers more detail:os...

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

0 votes

1.2k views

1 answer

dart - Flutter DraggableScrollableSheet not showing up on press of a button

I want to use DraggableScrollableSheet widget on my application, when I use that like with below code, that can show without ... )); }, ), ), See Question&Answers more detail:os...

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

0 votes

917 views

1 answer

dart - Show dialog on widget

In flutter, we want to overlay a dialog above the widget. We were able to display the dialog after pushing ... not important for this question. See Question&Answers more detail:os...

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

0 votes

1.3k views

1 answer

dart - Flutter images not loaded (EXCEPTION: resolving an image codec)

When I try to run images assets doesn't get properly loaded, I am getting an exception: The following assertion was ... 27) ? No issues found! See Question&Answers more detail:os...

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

0 votes

1.1k views

1 answer

dart - Flutter - DropdownButton overflow

I am experimenting with Flutter, and currently trying to display an input field and a dropdown in a list view in ... shrinks to be un-legible. See Question&Answers more detail:os...

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

0 votes

1.2k views

1 answer

dart - Flutter: How to get a list of names of all images in 'assets' directory?

I have 100 images that I need to display in a list. I don't want to hard code all names. How can I get ... 'images/${fileName}.png')).toList() See Question&Answers more detail:os...

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

0 votes

1.1k views

1 answer

dart - Flutter DraggableScrollableSheet not showing up on press of a button

I want to use DraggableScrollableSheet widget on my application, when I use that like with below code, that can show without ... )); }, ), ), See Question&Answers more detail:os...

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

0 votes

1.0k views

1 answer

dart - Show dialog on widget

In flutter, we want to overlay a dialog above the widget. We were able to display the dialog after pushing ... not important for this question. See Question&Answers more detail:os...

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

0 votes

1.9k views

1 answer

dart - Flutter: How to Get the Number of Text Lines

How to Get the Number of Text Lines In our Flutter project, we need to determine if the number of lines of ... use the code to implement it? See Question&Answers more detail:os...

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

0 votes

2.0k views

1 answer

dart - (Flutter) TextFormField Change labelColor on Focus

I am trying to change my labelText color when focused. I can change the text color but not when focused. I ... are images of what is happening: See Question&Answers more detail:os...

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

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1.4k views

1 answer

dart - Flutter WEB download option

I am making flutter web app that should generate a file from user data. And have the option to download the ... Can someone please help me out? See Question&Answers more detail:os...

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

0 votes

1.2k views

1 answer

dart - Flutter - Custom Font not displaying

This is an excerpt of my pubspec.yaml file: flutter: uses-material-design: true fonts: - family: Coiny fonts: - ... not the case with this one. See Question&Answers more detail:os...

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

0 votes

954 views

1 answer

dart - Flutter - The method was called on null

I'm programming an app that displays two media streams in the same view via one horizontal listView and one vertical listView. I ... , and if you need any more code please let me k...

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

0 votes

1.1k views

1 answer

dart - How do I tell when a NetworkImage has finished loading?

I have a NetworkImage and I'd like to know when it's finished loading. How do I do that? See Question&Answers more detail:os...

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

0 votes

1.1k views

1 answer

dart - Flutter StatefulWidget - State class inheritance?

The point of this question, is how to handle state changes, preferably automatically by the original ancestor. It seems to ... ); update(); } } See Question&Answers more detail:os...

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

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