dart Questions

Android Studio – How to retrieve data from a complicated json data model in Flutter

January 31, 2022
Sayak Chatterjee
2 Answers

Shippingmodel shippingmodelFromJson(String str) => Shippingmodel.fromJson(json.decode(str)); String shippingmodelToJson(Shippingmodel data) => json.encode(data.toJson()); class Shippingmodel { Shippingmodel({ this.sellerShipping, this.result, this.shippingType, this.value, this.valueString, }); Map<String, List<SellerShipping>> sellerShipping; bool result; String shippingType; int value; String valueString; factory Shippingmodel.fromJson(Map<String, dynamic> json) => Shippingmodel( sellerShipping: Map.from(json["seller_shipping"]).map((k, v)…

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Android Studio – Error when starting Android Studio project

January 30, 2022
Franckle Guilhermitt
2 Answers

Good night, could someone please help me with this error when running the project in android studio? I've looked everywhere and can't find a solution... follow the error below Launching libmain.dart on sdk gphone x86 in debug mode... Exception: [!]…

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Android Studio – Use text editing controller inside on changed flutter

January 28, 2022
Developer123
2 Answers

I am trying to use my text editing controller userNameController.text as a string value to pass into onChanged(). When the text field has something in it, I have a Boolean isUserFilled which is set to true, and false when the…

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Android Studio – Execution failed for task ':app:signReleaseBundle'

January 20, 2022
Carlos Peñaranda
4 Answers

I have this error at the moment to make flutter build appbundle this is the error: FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:signReleaseBundle'. > A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade > Failed…

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Android Studio – How to use navigator in flutter

January 18, 2022
Developer123
3 Answers

I am trying to get a navigator to work on my icons. I have all my icons laid out in a column, which persists across all my screens and I want to be able to go to different screens when…

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Android Studio – Spacing Icons in a container in Flutter

January 17, 2022
Developer123
2 Answers

I am trying to find a better alternative to spacing my icons in Flutter, I am currently using the SizedBox(...) Widget. Although I am not sure if this is the best method to use, the sized box seems to mess…

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Android Studio – Row widget contents are not getting displayed

January 16, 2022
Karthik KK
3 Answers

I am trying to build an app which retrieves all the table data and display it on the screen.I have made it using a list builder widget .I wanted to add a header to each of the rows retrieved .I…

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Android Studio – Creating a Side menu bar in flutter using rows and columns

January 12, 2022
Developer123
2 Answers

Login Screen <- picture for the Login Screen I am currently working on a GUI for a basic login screen using flutter/dart and am trying to understand how to create the menu bar as seen on the left side of…

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Android Studio – dart wrongly assumes value can be nullable

January 12, 2022
Matthew Cornelisse
3 Answers

I have the code if (WORDLIST[language]==null) throw new Exception("Invalid Language"); List<String> wordlist = WORDLIST[language]; the compiler says Error: A value of type 'List?' can't be assigned to a variable of type 'List' because 'List?' is nullable and 'List' isn't. However…

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Android Studio – Error in dart code final Color _color; TextSection (this._color);

January 12, 2022
user11428157
2 Answers

when I'm trying to define colour in dart code final Color _color; TextSection (this._color); it gives me an error. do anyone know how to fix this error. import 'package:flutter/material.dart'; class Textsection extends StatelessWidget { final Color _color; TextSection (this._color); @override…

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