Dart

When developing Flutter applications, we frequently need to handle information that changes over time: the number displayed on a counter, whether the user is logged in or not, items in a shopping cart, the current app theme. This information that can change and needs to be shared across different parts of the application is what we call state. Managing state means controlling this information in an organized way: where it’s stored, how it’s modified, and how widgets are notified when it changes to update the interface. ...

When developing applications, a common need is to preserve simple data between user sessions. SharedPreferences is the ideal solution for storing small amounts of data in key-value format, such as user preferences, application settings, or simple states that need to persist. In this tutorial, we’ll implement data persistence in Flutter’s default counter application, making the counter value persist even after closing and reopening the app. What is SharedPreferences? SharedPreferences is a cross-platform API that allows you to store primitive data types persistently on the device. It works like a key-value dictionary, where you can save and retrieve data of basic types such as strings, integers, booleans, and string lists. ...

In many applications, a calendar is more than just a grid of dates; it’s a scheduling tool, an event planner, or a way to visualize data over time. Although ready-made packages exist, building your own calendar widget in Flutter offers unparalleled control over its appearance, functionality, and business logic. In this tutorial, we will dive deep into the process of creating a monthly calendar widget. We’ll dissect the source code snippet by snippet, explaining the logic behind each part. At the end, we will present the complete, clean files, ready to be copied into your project. ...

Developing games or apps that simulate board games always brings interesting UI challenges. Recently, while creating a version of the classic card game Blackjack in Flutter, I found myself needing a playing card component that was not only functional but also visually appealing and, above all, reusable. In this post, I’ll guide you through the process of creating PlayingCard, a widget that renders both the front and back of a card, is fully customizable in size, and was the centerpiece of my Blackjack game. ...