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DART QUESTIONS

Is there a Dart equivalent of Python's all() method?
Is there a Dart equivalent of Python's all() method?
This might help you I think what you are looking is the every method.
TAG : dart
Date : January 11 2021, 03:28 PM , By : Ken
How to set final/const properties in Dart constructor
How to set final/const properties in Dart constructor
like below fixes the issue From the Dart language tour:
TAG : dart
Date : January 02 2021, 06:48 AM , By : PepeM
Dart_LoadScriptFromKernel: The binary program does not contain 'main'
Dart_LoadScriptFromKernel: The binary program does not contain 'main'
I think the issue was by ths following , I just run this code in VsCode and show this problem Dart_LoadScriptFromKernel: The binary program does not contain 'main'. , try saving it in your folder it works 100% and name it main
TAG : dart
Date : January 02 2021, 06:48 AM , By : unadopted
How to set literals after Dart 2.2
How to set literals after Dart 2.2
it should still fix some issue Set literals were not supported until 2.2, How to set literals after Dart 2.2. Please feel free to comment. Thank you. , You use { and } to specify Set (and Map) literals:
TAG : dart
Date : January 02 2021, 06:48 AM , By : Search Classroom
Flutter The const variable 'IconData' must be initialized
Flutter The const variable 'IconData' must be initialized
fixed the issue. Will look into that further I'm trying to use Flutter Icons on our project and after downloading font and dart class i put them into project, but for dart class i get this error , Variable names may not start with a digit. Change it
TAG : dart
Date : January 02 2021, 06:48 AM , By : Steve M
Why I cant use spread operator in this case?
Why I cant use spread operator in this case?
With these it helps You currently can use the spread operator only for collection literals ([] for List, {} for Map or Set).From Bob Nystrom's article introducing Dart 2.3's new features:
TAG : dart
Date : January 02 2021, 06:48 AM , By : lhoBas
How to do encryption like android's "PBEWithMD5AndDES" in flutter dart?
How to do encryption like android's "PBEWithMD5AndDES" in flutter dart?
Does that help PBEWithMD5AndDES uses PBKDF1 to generate the key material (not PBKDF2). This gives you 128 bits of key material that you then use as two 64 bit halves as the key and the IV for DES.Derive the key and IV as follows - I've plugged in som
TAG : dart
Date : January 02 2021, 06:48 AM , By : user90210
Flutter: upload image using binary body
Flutter: upload image using binary body
I hope this helps . The body parameter of the put method accepts a List that will be used as a list of bytesFrom the http API reference: https://pub.dev/documentation/http/latest/http/put.html
TAG : dart
Date : January 02 2021, 06:48 AM , By : user109285
Flutter[desktop]: how to get input from physical keyboard without textfield?
Flutter[desktop]: how to get input from physical keyboard without textfield?
hop of those help? You want a RawKeyboardListener.An important caveat is that desktop support for that is still a work in progress; on Linux and Windows you'll currently get an Android key event that's only partially populated.
TAG : dart
Date : January 02 2021, 06:48 AM , By : silvervino
Dart code reformat didn't give me the expected format
Dart code reformat didn't give me the expected format
To fix the issue you can do Add trailing commas like on this example: https://flutter.dev/docs/development/tools/formattingSo your code would become:
TAG : dart
Date : January 02 2021, 06:48 AM , By : CrookedNumber
PlatformException (PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: 12500: , null))
PlatformException (PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: 12500: , null))
will be helpful for those in need The OP, @Mircea, specifically mentioned error 12500. This is how I overcame that error:I have spent the last few days running into the same problem. I refactored my code dozens of times, added break points, reset the
TAG : dart
Date : January 02 2021, 06:48 AM , By : user183289
How to force flutter to use wifi rather than 4G?
How to force flutter to use wifi rather than 4G?
I hope this helps . Core Flutter framework has not that feature yet(and won't have at least for a long time imo).When it comes hardware related things, you can almost say that native code is only way to go. Good thing is there many official third pa
TAG : dart
Date : January 02 2021, 06:48 AM , By : ERaubenheimer
How to delete/detect any emoji as a whole from a string in Flutter?
How to delete/detect any emoji as a whole from a string in Flutter?
seems to work fine Update Dart team released a helper package that helps achieving this. String.characters.skipLast(1) should be able to do what you expect.
TAG : dart
Date : January 02 2021, 06:48 AM , By : Andrew
How to Render data from Request inside a FutureBuilder
How to Render data from Request inside a FutureBuilder
I think the issue was by ths following , I'm trying to list pokemons from my api, its works when i call the list but when i try to get the data for each pokemon it doesn't render the data. , One way is to create a FutureBuilder per item, like so:
TAG : dart
Date : January 02 2021, 06:48 AM , By : Kubla Khan
Provider Throw Errors in InitState. Provider.of<SomeProvider>(context)
Provider Throw Errors in InitState. Provider.of<SomeProvider>(context)
I wish did fix the issue. Provider.of(context, listen: false).selectedProduct and ensure there are no NotifyListeners in the initState call.
TAG : dart
Date : January 02 2021, 06:48 AM , By : MikeW
StaggeredGridView not scrolling after updating Flutter
StaggeredGridView not scrolling after updating Flutter
seems to work fine The BoxHitTestResult exception was fixed in new version of flutter_staggered_grid_view 0.3.0You can check changelog here
TAG : dart
Date : January 02 2021, 06:48 AM , By : pad
Error Running Gradle on Flutter with Visual Studio Code
Error Running Gradle on Flutter with Visual Studio Code
it helps some times After many researches on how to fix my debugging issue with visual studio code proves abortive then i tried switching to android studio and downgrading my windows 10 to 8, but still that didn't solve it, it worsen the case.I tried
TAG : dart
Date : January 02 2021, 06:48 AM , By : Juice
Dart: upload .jpg file to google Drive
Dart: upload .jpg file to google Drive
I wish this help you Maybe you could use the googleapis package. It could be simpler to use.Add this dependencies in your pubspec.yaml
TAG : dart
Date : January 02 2021, 06:48 AM , By : Tamizhvendan
create widget for each item in the list in Flutter Dart
create widget for each item in the list in Flutter Dart
hop of those help? I am populating an array from json data in Dart , Use map function.Example:
TAG : dart
Date : January 02 2021, 06:48 AM , By : Aki Björklund
What type of implementation should be favoured?
What type of implementation should be favoured?
Hope this helps In Dart you probably don't need to think about third variant possible advantages in case of multiple threads. Dart is different from e.g. Java/Scala in this regard, since Dart has isolates, not threads, and isolates per their name are
TAG : dart
Date : January 01 2021, 06:31 AM , By : Justin Bowers
How can I store data into map<String, List<String>> using Dart?
How can I store data into map<String, List<String>> using Dart?
I wish did fix the issue. I have the bellow data structure , You could do something like that.
TAG : dart
Date : January 01 2021, 06:31 AM , By : Sebastián Ucedo
Dart rounding errors
Dart rounding errors
I wish this help you You can round a value to a multiple of ten (or of any other number) by:
TAG : dart
Date : December 28 2020, 02:06 PM , By : wpoch
How to print List elements with map?
How to print List elements with map?
help you fix your problem Not entirely sure what your want but I guess the following do what your want?
TAG : dart
Date : December 25 2020, 10:30 PM , By : zdyne
Dart: best type to store currency
Dart: best type to store currency
fixed the issue. Will look into that further You might want to look into package:decimal.In general you could use int to store cents (or whatever the smallest amount of currency is that you want to track) and then format it into friendlier units (e.g
TAG : dart
Date : December 25 2020, 09:30 PM , By : unadopted
Extending dart class similar to js prototyping or swift extension
Extending dart class similar to js prototyping or swift extension
With these it helps There is an open issue about this on dartlang repo. It is still open and don't think it is possible for now.
TAG : dart
Date : December 25 2020, 07:01 AM , By : Lex Viatkine
how to declare map interface in dart?
how to declare map interface in dart?
I think the issue was by ths following , I'm a web frontend developer used javascript and typescript only before. And I'm trying to declare the interface for map. , If you want to use a map you need to have a key and value, example:
TAG : dart
Date : December 24 2020, 12:47 PM , By : Pradeep Gowda
Dart spread operator to say "place this in list if it's not null"
Dart spread operator to say "place this in list if it's not null"
I wish did fix the issue. There is a null-aware spread operator (...?), but your twoOrNull() function would have to return either [2]or null; the spread operator expands an iterable within another collection literal, and it doesn't make sense to "spr
TAG : dart
Date : December 23 2020, 09:30 PM , By : August
Can I redefine a superclass's property in a subclass? (c#'s new modifier maybe?)
Can I redefine a superclass's property in a subclass? (c#'s new modifier maybe?)
may help you . Kennel has a Dog. , It is possible, but if and only if the property has no setter.
TAG : dart
Date : December 23 2020, 02:30 PM , By : Raghaw
How do I find the size of a Pub package?
How do I find the size of a Pub package?
I think the issue was by ths following , Dart comes with a Tree Shaker algorithm that will remove all unused code in release mode, reducing the size of your app to only the minimum. So there's no real comparison with java and the jar size. Only the c
TAG : dart
Date : December 22 2020, 10:30 AM , By : PepeM
Standard function to throw an exception if an expression is false?
Standard function to throw an exception if an expression is false?
To fix this issue There is nothing in the Dart SDK, but Google's quiver package provides a checkState function that does what you want.
TAG : dart
Date : December 20 2020, 04:45 AM , By : Peter Leung
It it possible to call async method inside constructor?
It it possible to call async method inside constructor?
this will help Then syntax of the then method is wrong in your case, it expects a function that returns a FutureOr not a Future itself.You code should be
TAG : dart
Date : December 15 2020, 09:26 AM , By : Jim Davis
child init method is called when parent is rebuild - flutter
child init method is called when parent is rebuild - flutter
Any of those help You can use the mixin AutomaticKeepAliveClientMixin and override the wantKeepAlive getter and return true to avoid recreating the State every time.
TAG : dart
Date : December 01 2020, 04:55 PM , By : Allen
`vsync` property in TabController constructor
`vsync` property in TabController constructor
I hope this helps you . Add with TickerProviderStateMixin to the end of your State’s class declaration.
TAG : dart
Date : November 29 2020, 03:01 PM , By : Mihai Mocanu
Convert JSON to map with string keys and List<String> values
Convert JSON to map with string keys and List<String> values
With these it helps So, I assume that the .cast method introduced with Dart 2 doesn't know how to convert nested types that aren't simple types like String, int, or bool.
TAG : dart
Date : November 29 2020, 04:01 AM , By : ChaseVoid
Dart - Linting option to force explicit types
Dart - Linting option to force explicit types
Any of those help Is there a linting option for Dart that forces explicit types? I don't like how if I have an unspecified return type for a function it becomes dynamic, while if I don't specify the type for a variable it properly infers it. , Sure!
TAG : dart
Date : November 28 2020, 04:01 AM , By : user116330
Flutter - Animate change on height when child of container renders
Flutter - Animate change on height when child of container renders
help you fix your problem In the end I just had to use AnimatedSize. It replicates exactly the animation that I want.
TAG : dart
Date : November 27 2020, 04:01 AM , By : Tonix
Dart: http post upload to google Drive
Dart: http post upload to google Drive
I hope this helps . When you want to add a more complex form item to MultipartRequest, you add it as a file. (Yes, slightly strange...)Replace request.fields.add... with...
TAG : dart
Date : November 27 2020, 04:01 AM , By : Andrew L.
Should I use constructor or method for deserealization Json to List<Map>?
Should I use constructor or method for deserealization Json to List<Map>?
This might help you I hope I understood you query correctly. One way to accomplish this would be
TAG : dart
Date : November 26 2020, 06:28 AM , By : Roel
Flutter / GraphQL - Mutation with custom type as parameter
Flutter / GraphQL - Mutation with custom type as parameter
seems to work fine Love to see the community that is created around the graphql_flutter library.
TAG : dart
Date : November 26 2020, 04:01 AM , By : Ken
automatically generating protobuf annotated classes
automatically generating protobuf annotated classes
help you fix your problem There is no way to accomplish this today. The build system, build_runner does not allow overwriting files so it isn't possible to programmatically insert these annotations into the protobuf generated code.This would require
TAG : dart
Date : November 25 2020, 07:27 PM , By : user135518
How to move dart files in VSCode and keep imports correct
How to move dart files in VSCode and keep imports correct
around this issue VSCode does not allow extensions to participate (or catch) the renaming of a file. An issue is in progress on this topic on the VSCode repo. The Dart team is waiting for it to implement this feature.
TAG : dart
Date : November 25 2020, 12:01 PM , By : Praetoriansentry
Cannot find html and css file for Angular Dart component
Cannot find html and css file for Angular Dart component
this one helps. You can/should access to the file with something like templateUrl: 'packages/my_app/.../PlaybackSignalProcessingController.html'.
TAG : dart
Date : November 25 2020, 09:00 AM , By : Rohii
Change state of widget outside State class
Change state of widget outside State class
Hope this helps One solution would be the one in the full example below. The slider widget updates the value in the main page and it is used to set the value in the other slider.I have made up some of the code since your snippet was not complete.
TAG : dart
Date : November 25 2020, 04:01 AM , By : SachinJadhav
Interation and group
Interation and group
wish helps you You can create a map where the key are the category and value are a list of features:
TAG : dart
Date : November 24 2020, 12:01 PM , By : user181445
Flutter check if app is running in iPad or iPhone
Flutter check if app is running in iPad or iPhone
wish help you to fix your issue Use device_info
TAG : dart
Date : November 24 2020, 04:01 AM , By : user118656
how to enable --enable-experimental-mirrors in dart build?
how to enable --enable-experimental-mirrors in dart build?
seems to work fine I haven't tried this myself yet but maybe you can pass it as a command line option in the transformer config
TAG : dart
Date : November 23 2020, 01:01 AM , By : jaime
Show a text field dialog without being covered by keyboard?
Show a text field dialog without being covered by keyboard?
To fix the issue you can do If your use case is to add multiple TextFields inside your Dialog so your main Form does not get crowded, I think it is better if you build something more customizable than AlertDialog and SimpleDialog as they are used for
TAG : dart
Date : November 22 2020, 03:01 PM , By : joshski
Define custom event listener in dart code, not html markup
Define custom event listener in dart code, not html markup
Hope that helps You need for each event handler in your component an EventStreamProvider (static)and a getter for easy access.
TAG : dart
Date : November 22 2020, 12:01 PM , By : Nandor Devai
Routing: get notified about parameter updates without reloading the view
Routing: get notified about parameter updates without reloading the view
wish of those help It is one of the use-cases on the TODO list: https://github.com/angular/route.dart/issues/1
TAG : dart
Date : November 22 2020, 11:17 AM , By : John Phipps
How to trigger an update of NgComponent when child property changes
How to trigger an update of NgComponent when child property changes
around this issue You have to set a watch to car.color inside your CarImage. How this looks depends on what data structure you use for car.
TAG : dart
Date : November 22 2020, 11:12 AM , By : Blight
How are dart generated libraries generated?
How are dart generated libraries generated?
hope this fix your issue Most of Google's external APIs are described in JSON document by an API called the Discovery Service. The document is called the discovery document and provides enough information to generate a client API that can represent t
TAG : dart
Date : November 22 2020, 10:58 AM , By : user185751
How to use dart-protobuf
How to use dart-protobuf
seems to work fine I'm not too familiar with dart-protobuf, but it looks like you have to use the protobuf compiler and the dart-protoc-plugin project to generate your Dart protobuf library from a proto definition.There are some instructions here: ht
TAG : dart
Date : November 22 2020, 10:58 AM , By : user184975
Linter warnings when importing packages within dart libs
Linter warnings when importing packages within dart libs
around this issue Your package should not contain more than one pubspec.yaml file. The lib/ folder should have only dart files and other assets, such as html, js and css files. For example, you can organize your project as follow:
TAG : dart
Date : November 22 2020, 10:40 AM , By : niel
NoSuchMethod in dart?
NoSuchMethod in dart?
seems to work fine According to the official docs for invoking an unimplemented method, you have to satisfy one of the following points: The receiver has the static type dynamic. The receiver has a static type that defines the unimplemented method (a
TAG : dart
Date : November 22 2020, 04:01 AM , By : Blaise Roth
Getting the value from a custom input widget
Getting the value from a custom input widget
I think the issue was by ths following , You need to provide onChanged and other events in your custom widget, even if you are just providing these to the underlying TextField. In other words, you need to pass the onChanged function down through your
TAG : dart
Date : November 22 2020, 04:01 AM , By : barefootChild
Align Text of different size in row to bottom
Align Text of different size in row to bottom
will be helpful for those in need I think you need to play around with the crossAxisAlignment and textBaseline properties of your Row widget.Try something like this:
TAG : dart
Date : November 21 2020, 04:01 AM , By : adbanginwar
App inside an html element
App inside an html element
I wish this helpful for you I did several tests and right now my code is dead simple. The correction that made it working are:
TAG : dart
Date : November 20 2020, 12:01 PM , By : Theo
Dart: Get POST parameters on server side
Dart: Get POST parameters on server side
will help you Here is a complete tutorial https://www.dartlang.org/docs/tutorials/httpserver/handling-post
TAG : dart
Date : November 20 2020, 09:01 AM , By : RichAA
How can I get rid of the animation on the InkWell widget?
How can I get rid of the animation on the InkWell widget?
Hope that helps If you don't care about the splash animation, do not use InkWell. That widget exists only for that.Instead use GestureDetector, which is basically an InkWell without the animation.
TAG : dart
Date : November 20 2020, 04:01 AM , By : Tim Benninghoff
How to conditionally add an error to an Observable in RxDart?
How to conditionally add an error to an Observable in RxDart?
Hope this helps Stream.map will forward thrown exceptions on as error events in the stream.
TAG : dart
Date : November 20 2020, 04:01 AM , By : Kilimanjaro

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