Recent questions tagged Flutter

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flutter - Dart 2.1.0 smart cast using 'is' not working

I'm using the Bloc pattern and have the following code to define my states: import 'package:meta/meta.dart' ... version is atleast 2.1.0. See Question&Answers more detail:os...

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

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flutter - What is the difference between existing types of snapshots in Firebase?

as I'm further progressing with my code and my coding experiences in Flutter. I've encountered different types of ... ?. Thank you in advance. See Question&Answers more detail:os...

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

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flutter - Firebase Firestore new line command

I'm trying to utilize a new line command to create a new line in text. It appears from this issue that ... still has the within the string. See Question&Answers more detail:os...

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

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flutter - Builder versus GlobalKey

Numerous questions relating to building Flutter UIs come down to the wrong BuildContext (such as showing a SnackBar) ... use a Builder instead? See Question&Answers more detail:os...

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

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flutter - How to capitalize the first letter of a string in dart?

How do I capitalize the first character of a string, while not changing the case of any of the other letters? For ... give "This is a string". See Question&Answers more detail:os...

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

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flutter - How to fix HttpException: Connection closed before full header was received

I have recently upgraded my flutter version in my app. But when I want to debug the application, it shows ... any workaround, please share. See Question&Answers more detail:os...

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

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flutter - Open drawer on clicking AppBar

If you create an Scafold there is an option for drawer. If you now create this drawer you get automaticly the ... icon for the drawer button? See Question&Answers more detail:os...

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

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flutter - How to use BottomNavigationBar with Navigator?

The Flutter Gallery example of BottomNavigationBar uses a Stack of FadeTransitions in the body of the Scaffold. I ... any examples of 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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flutter - Sizing elements to percentage of screen width/height

Is there a simple (non-LayoutBuilder) way to size an element relative to screen size (width/height)? For example: ... to put logic like 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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flutter - Vertical viewport was given unbounded height

This is my code: @override Widget build(BuildContext context) { return new Material( color: Colors.deepPurpleAccent, ... /object.dart:1555:9) See Question&Answers more detail:os...

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

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flutter - Unable to find bundled Java version. MacBook Air M1

I was using flutter on MacBook Pro with intel. It was working fine. Now I switch to MacBook Air with M1 ... Doctor found issues in 1 category. See Question&Answers more detail:os...

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

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flutter - Subclass a class that extends StatelessWidget or StatefulWidget class

Is it possible to create a class that extends a class extending StatelessWidget or StatefulWidget. For example: class ... I had not success. 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

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flutter - How to Async/await in List.forEach() in Dart

I'm writing some kind of bot (command line application) and I'm having trouble with async execution when I'm ... wrong I would appreciate 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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1.3k views

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flutter - FlutterError: Unable to load asset

This is the folder structure of my app .idea .vscode ... 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

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flutter - How to debounce Textfield onChange in Dart?

I'm trying to develop a TextField that update the data on a Firestore database when they change. It seems to ... print(widget.idCliente); } } See Question&Answers more detail:os...

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

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1.7k views

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flutter - InkWell not showing ripple effect

Tapping the container triggers the onTap() handler but does not show any ink splash effect. class _MyHomePageState ... well but in vain. See Question&Answers more detail:os...

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

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flutter - TextField inside of Row causes layout exception: Unable to calculate size

I'm getting a rendering exception that I don't understand how to fix. I'm attempting to create a column that ... calculate the size of that row? 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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flutter - How do you detect the host platform from Dart code?

For UI that should differ slightly on iOS and Android, i.e. on different platforms, there must be a way to detect ... in the docs. What is 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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1.3k views

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flutter - How do I use Dart extension functions?

Dart 2.6 introduces a new language feature called "static extension members". However, I do not quite understand ... => this.children.length; 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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flutter - What does the empty parentheses after the onPressed property mean in Dart?

I know the syntax for calling a function after onPressed and onTap for a widget. There are two options We ... do the empty parentheses mean? 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

flutter - Part of the window dialog(showDatePicker) that falls on top of the pdf(EasyWebView) does not work, not react

I use two plugins: EasyWebView and showDatePicker. In EasyWebView i show pdf via the link. Under certain conditions, I need ... ) ? No issues found! How this can be solved?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

1 answer

flutter App项目，ios里，微软中文输入法，打字带拼音

flutter App项目。运行在ios时，输入框打字的时候，微软中文输入法，打字带拼音，拼音和汉字一起出现，不知道怎么解决？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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