Recent questions tagged Flutter

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flutter web - Finished with error: Failed to establish connection with the application instance in Chrome

Finished with error: Failed to establish connection with the application instance in Chrome. This can happen if the ... didnot solve my problem. 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 response body with request.send() in dart

I'm doing an api request uploading an image with var request = new http.MultipartRequest("POST", uri); var ... is very much appreciated, 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 - Dart Multiple Constructors

Is it really not possible to create multiple constructors for a class in dart? in my Player Class, If I have this ... a nice way to solve 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 overlap SliverList on a SliverAppBar

I'm trying to overlap a SliverList a few pixels over the SliverAppBar. Similar to this post. I'd like ... would be appreciated, 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 - How do I add margins to my widget ? Understanding the effect of EdgeInsets

I am trying to wrap my head around ui placement in Flutter. So I currently have something that looks like this I would ... , ], ), ), ); 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 change the status bar text color on Ios

I am new to all this flutter thing. I searched everywhere to find a solution for this little problem. Is there a way ... : null, ), ], ), 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 - Create Lists from List based on Matching Object Properties

I have a list of objects which contain several properties. I am looking to break the list into several lists composed of ... -list when: B = A. 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 - Empty set state what is the point?

I want to know the point behind calling setState without setting a new value to the variables. readLocal() async { prefs ... setState(() {}); } 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 - "MissingPluginException(No implementation found for method getDatabasesPath on channel com.tekartik.sqflite)" when i use floor database

I'm trying to use floor database but when i want to build database i got below error : E/flutter ( ... .imagepicker.ImagePickerPlugin")) } } 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 calling the function without parentheses and with parentheses

What is the difference between calling the function without parentheses and with parentheses on onPressed or Ontap ... any proper documentation. 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: Is there a disadvantage to using const constructor?

There is an analyzer/lint check to warn me when it is possible to use a const constructor: https://dart-lang. ... )], so why not everywhere)? 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 - ScrollController attached to multiple scroll views

I have a stateful widget with children as such final _scrollController = TrackingScrollController(); PageView( ... of TrackingScrollController? 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 - Unable to locate Android SDK

I already had android studio and the android sdk installed,I later added flutter and flutter sdk. Here is my ... not have Android SDK installed. 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 - TabBarView with dynamic Container height

So this is my layout structure This is the main screen ListView( children: <Widget>[ _buildCarousel(), _buildHomeTabBar ... /object.dart:1634:7) 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 scroll item in ListView so it is visible?

When adding new items (e.g. a ListTile) to a ListView is there a way to scroll the newly added item into ... e.g. it is sorted alphabetically). 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 form data disappears when I scroll

I have a widget, that has an image element and and expanded listview of form elements that as I fill out and ... children: _children, ), ); } 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 access to the firebase Authentication part

In my app I've 2 login methods(google&facebook) and all the users appear in the Authentication part inside my ... and not inside my database? 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 change color of particular text in a text field dynamically?

Consider bellow image, I want to dynamically change the text color of part of the text based on the user input ... can i do that in flutter? 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 build APK with no sound null safety

I can run an app in release mode on my phone with passing flag --no-sound-null-safety --release, but ... --no-sound-null-safety will work 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 - Could not find a generator for route

I′m newbie to flutter and reveice one exception about route and paginator in Flutter. EXCEPTION CAUGHT BY ... advance for your attention 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 - ChangeNotifierProvider vs ChangeNotifierProvider.value

I am quite new to this framework and working on state management using provider package where I come across ... 't work as intended. See Question&Answers more detail:os...

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

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2.3k views

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flutter - Reload data when using FutureBuilder

I am loading data when widget is loading like the code below. Once the UI is fully loaded, I like to add ... , AsyncSnapshot snapshot) { } } 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 - Sort List by alphabetical order

I'm trying to sort a list by alphabetical order and tried porting something i had in javascript to flutter. But ... has no instance method '<'. 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 doctor doesn't work on neither Command Prompt or PowerShell window?

flutter doctor doesn't work on either Command Prompt or PowerShell window? I have been trying to install ... will see exactly the problem 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 change text color of AppBar, icon color of FAB universally using theme?

I am able to set the background color of AppBar to Colors.amber. This automatically sets the text color to Black. I ... : Colors.white, ), ), See Question&Answers more detail:os...

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

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2.0k views

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flutter - The AppBarDesign can't be assigned to the parameter type 'PreferredSizeWidget'

Anyone please give some information why this is happening? When I try to add a class AppBarDesign which implements appBar ... (title), ); } } See Question&Answers more detail:os...

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

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2.0k views

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flutter - Looking up a deactivated widget's ancestor is unsafe

I am new in Flutter and I am trying receive data with a Dialog. When a click in textField the error of image2 ... () method. I/flutter (31032): 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 - No Material widget found

I am new to Flutter and I was trying do execute the example here. I just want to use the TextField widget ... thrown: No Material widget 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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