Creating a Fluid Animation while Randomizing a String List in Flutter

Описание: Learn how to implement a `fade-in` and `fade-out` animation in Flutter while randomizing a string list. Follow our step-by-step guide for easy implementation!
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This video is based on the question https://stackoverflow.com/q/69467489/ asked by the user 'Kuroiteiken' ( https://stackoverflow.com/u/5793756/ ) and on the answer https://stackoverflow.com/a/69467831/ provided by the user 'Lulupointu' ( https://stackoverflow.com/u/5990125/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Fluid Animation while Randomizing a String List in Flutter

Are you looking to add some flair to your Flutter app by animating the randomization of strings? If so, you’ve come to the right place! In this guide, we will tackle the challenge of not just randomizing a list of strings, but also displaying them with a smooth fade-in and fade-out animation. Let’s break it down step by step.

The Problem

You want to randomize a list of strings and display the entries in a text field, complemented with a fade-in and fade-out effect. This approach enhances the visual appeal of your app, but integrating string randomization with animations can be tricky if you're unaware of the right techniques. In this guide, we will share the solution using Flutter's built-in features.

The Proposed Solution

Key Flutter Concepts to Use

AnimatedSwitcher: This widget allows you to animate transitions between different widgets, making it perfect for your case where a string changes.

ValueKey: This is a mechanism to distinguish between widgets. Using a unique key prevents animation issues when the widget is not changed.

Step-by-Step Implementation

Step 1: Set Up Your Project

Ensure you have a Flutter environment set up. Begin by creating a new Flutter application or adding this code into an existing app.

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Step 2: Create the Stateful Widget

In your application, we will create a stateful widget that manages the list and string shuffling.

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Step 3: Implement the Timer to Shuffle Strings

Add a timer that shuffles the list every few seconds and updates the displayed string.

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Step 4: Build the Animated UI

Use AnimatedSwitcher to enable animations on text changes. Make sure to include a unique ValueKey so it animates correctly when the string changes.

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Complete Code Example

Below is your entire Flutter app that randomizes and animates strings.

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Conclusion

Congratulations on successfully adding animation to your random string display in Flutter! This technique not only makes your application visually appealing but also showcases your skills in handling animations effectively. Now you can modify the timer duration and experiment with different animations to truly personalize your app.

Happy coding!