![]() Clicking on the add button will allow us to add a new task to the list. The app requirements are simple at this point. Perhaps, this article is on your to-do list right now. ![]() Let’s take the example of a to-do list app that sends reminders to users and encourages them to get work done. Let’s dive into an example to understand better. Once it’s ready, a simple `flutter test` will start running the test code. It will unveil methods to spin up your widget, declare your tests statements, and allow you to find elements and expect the behaviors. You can easily start writing Flutter widget tests by importing the package `package: flutter_test/flutter_test.dart`. ![]() But, for now, let’s stick with one strong reason - Flutter makes writing tests a fun task due to its incredible developer ecosystem. We recently published a video on our Youtube channel, exploring five reasons why Flutter is a big deal. This Google framework is even tackling other platforms like Web and Desktop.īut we have had different hybrid technologies for years now, so why should we care for a new one? Powered by Dart, Flutter makes it incredibly easy to develop a single code base for the different client environments such as iPhone, Apple Watch, Apple TV, Android, and more. Flutter is the thing for mobile development these days. Have you heard of Flutter? No? Let’s fix that. We get so excited about seeing our code running in production that we don’t think it might fail. In the app.Writing tests for applications is not the most fun task. In the test app that these images are from, I also have a list of all the dogs There's no need to re-write this widget over and over.Īnd, this circle image doesn't care at all about what it's displaying. You may want a round image of a certain size, you can just pass in a url and This component is designed for re-usability because anywhere in your app that Then, anywhere in your app, you can reuse this Widget: new CircleImage('https.). The most important part of using Flutter Widgets effectively is designing yourįor example, the CircleImage widget from the image above: class CircleImage extends StatelessWidget Such as `columns`and `padding` in here that I'm glossing over. This isn't _exactly_ accurate, there are layout widgets This is the widget hierarchy for this page: The rest are outlined white, and they're simply dumb components that have noĬoncern over their content, they just display what they're told. The blue outlines represent pieces of UI that logically group together. ![]() This picture is from one of the tutorial apps on FlutterByExample, and this isĪ detail page, of which there is one for every dog in the app. In this picture, every thing that's outlined is a widget: If you're coming from the web: imagine that your CSS, HTML, and JavaScript are all handled by A simple widget that adds a background color: const BoxDecoration(background: Colors.blue).A simple widget that a user interacts with const Button(onTap.A simple widget that displays text: const Text('Hello World').With layout, or it may handle interaction. It's widgets all the way down.įlutter is unique in that every aspect of UI is handled with Widgets.Ī widget might display something, it might help define design, it might help Even the root of yourĪpp is just a widget. Widgets are nested inside of each other to build your app. Like building a lego set - piece by piece. UI that you can combine to make a complete app.
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