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Inheritance allows subclasses to inherit properties and methods from superclasses, promoting code reuse. Method overriding lets subclasses customize inherited methods, enhancing flexibility and maintainability. These concepts are fundamental in object-oriented programming, especially in languages like Dart.

This article dives deep into Dart programming, covering data structures like lists, maps, sets, and the crucial aspect of null safety. Understand how to leverage these features to write efficient and reliable Dart code for improved readability and maintainability.

I have creaetd a timer widget with the help of stream. But the time widget doesnt run itself. Can somebody please go through my code and let me knwo what is the problem with my code. It was working under a futurebuilder bit i had upadted the code with streambuilder now. Please help. I have included the full code of my timer widget to...

The History of JS Interop in Dart — About twelve years ago, Google introduced Dart, a language which initially seemed set to take over a lot of JavaScript’s use cases, but which eventually found its own niche (notably with Flutter). JS interoperability has remained important, though, and with Dart 3.3 has gotten significantly better.

Hope you're doing well! So, I've been using GetIt to handle dependencies in my project, and it's been smooth sailing. But now, I've run into a problem. When I try to access a dependency within the vm:entry-point part, it throws an error, saying that SyncWorker isn't registered in GetIt. I've checked, and SyncWorker is definitely registered. Could it be something with the vm:entry-point causing...

What happens when you take a spaceship worth hundreds of millions of dollars, blast it into space and deliberately smash it into an asteroid at speeds of 23,000km/h? Well, as confirmed by NASA last year, you’ll probably take a hefty chunk out of the asteroid. Thanks to the Double Asteroid Redirection Test (DART) mission, the […]

it seems I've got a problem with the real database on Firebase database. the address of the database is flutter-update-.........europe-west1.firebasedatabase.app/ the error when I click on the save button: Invalid character (at character 68) flutter-update-.........europe-west1.firebasedatabase.app/ I have even removed https:// from the start of the database address, but does not work! import 'package:flutter/material.dart'; import 'package:http/http.dart' as http; import 'dart:convert'; import 'package:my_shop/providers/product.dart'; class Products with...

SOLID principles provide a time-tested blueprint for achieving this in object-oriented programming languages like Dart. The Single Responsibility Principle (SRP) advises that each class in your code should focus on just one task. The Open/Closed Principle (OCP) states that yourcode should be easily extendable without needing to modify existing code. The Interface Segregation Principle advises that classes should not be forced to implement interfaces...

Dependency Injection (DI) is a technique that helps manage dependencies between components. Instead of a component directly creating the objects it depends on, those dependencies are provided (“injected”) from the outside. This leads to several key benefits, including improved unit testing and loose coupling.

Functions in Dart provide a powerful way to organize code and encapsulate functionality. In this blog post, we’ll explore different aspects of Dart functions, including positional arguments, one-line functions, optional parameters, and named parameters. Let’s get started.

while testing file_picker package, I found these errors: Error: Unsupported operation: Platform._operatingSystem dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 294:3 throw_ dart-sdk/lib/_internal/js_dev_runtime/patch/io_patch.dart 244:5 _operatingSystem dart-sdk/lib/io/platform_impl.dart 56:40 get operatingSystem dart-sdk/lib/io/platform.dart 83:44 get operatingSystem dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 1430:8 get dart-sdk/lib/io/platform.dart 156:50 get isAndroid dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 1430:8 get packages/file_picker/src/file_picker.dart 50:18 _setPlatform packages/file_picker/src/file_picker.dart 40:44 get _instance dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 1430:8 get packages/file_picker/src/file_picker.dart 42:37 get platform packages/whatsapp_clone/webPages/login_signup_page.dart 30:65 chooseImage dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54 runBody dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 127:5 _async packages/whatsapp_clone/webPages/login_signup_page.dart 28:13 chooseImage packages/whatsapp_clone/webPages/login_signup_page.dart 88:33...

When using the latest version of google_fonts (6.2.0) package in flutter project, I'm facing this 'Type FontFeature not found' issue: /C:/Users/Dell/AppData/Local/Pub/Cache/hosted/pub.dev/google_fonts-6.2.0/lib/src/google_fonts_base.dart:69:8: Error: 'FontFeature' isn't a type. List<FontFeature>? fontFeatures, ^^^^^^^^^^^ Target kernel_snapshot failed: Exception FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:compileFlutterBuildDebug'. > Process 'command 'C:\flutter\flutter\bin\flutter.bat'' finished with non-zero exit value 1 I tried downgrading the package version...

I'm building a no-code test automation tool for Flutter and Flutter driver. For Flutter driver to connect it needs the url of the Dart VM Service. In Flutter this is reported as follows when running a debug build. A Dart VM Service on sdk gphone64 arm64 is available at: http://127.0.0.1:56083/oOR_LvT4RT4=/ Over the past 3 years, the way this is reported has changed 4 times...

everytime i try to run any flutter command it gives me an error of "Unable to 'pub upgrade' flutter tool. Retrying in five seconds..", even commands like flutter doctor or any command is not working like the following screenshot: enter image description here also if this anything to do witht this error; the following message appears and neveer leaves "Initializing the Flutter SDK. This...

in my case defaultConfig { // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). applicationId "blblblb" minSdkVersion 23 targetSdkVersion 33 versionName "1.0" versionCode 1 multiDexEnabled true testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" }

If I want to initialize object in hook widget, should I use useEffect or useMemoized? class CreateUserScreen extends HookWidget { late ABC abc; CreateUserScreen({super.key}); @override Widget build(BuildContext context) { useEffect(() { abc = ABC(); return null; }); ... } or class CreateUserScreen extends HookWidget { CreateUserScreen({super.key}); @override Widget build(BuildContext context) { final abc = useMemoized(() => ABC()); ... }

I am encountering difficulties preserving the cache of a WebView in Flutter, specifically when the app is terminated. Currently, I am using the FlutterWebView package to load a website, but the cache is not persisting after the app termination. I have also attempted to address this issue using the InAppWebView package without success. What I've Tried: Utilized the FlutterWebView package for webview integration. Explored...

Published at LXer: Steps to install Dart Programming Language on Debian 12, 11, or 10, which includes stable, testing, or dev branches for those that require with multiple versions for certain use...