Скачать или смотреть How to Create a Random Generator for List Elements in Flutter

Learn how to implement a `random text generator` in Flutter using a list. This guide provides step-by-step instructions for beginners.
---
This video is based on the question https://stackoverflow.com/q/63714029/ asked by the user 'influtter' ( https://stackoverflow.com/u/14211421/ ) and on the answer https://stackoverflow.com/a/63714055/ provided by the user 'Josteve Adekanbi' ( https://stackoverflow.com/u/11452511/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to do random generator of elements of list?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Create a Random Generator for List Elements in Flutter

If you’re a Flutter developer and you want to generate a random quote or text from a list of predefined options when a button is pressed, you might encounter a few bumps along the way. In this guide, we’ll explore a simple yet effective solution to creating a random text generator in Flutter. This will be particularly useful if you’re building an app that showcases random phrases or quotes to users every time they interact with it.

The Problem: Generating Random Text

You have a list of quotes in your Flutter application, and your goal is to display a new random quote each time a button is pressed. However, you might find yourself facing issues with your existing code. Here’s an example of what you might have started with:

[[See Video to Reveal this Text or Code Snippet]]

When you try to randomly select the quote, you may find it isn't working as expected. This could be frustrating, especially if you’re eager to see your random generator in action.

The Solution: Correct Implementation of Random Generation

Step 1: Define the Index Correctly

The first step in resolving the issue is to ensure that your _index variable is set up correctly. Instead of defining it as a Random object, it should be an int. This way, you'll have an index that you can use to access elements in your list of quotes.

Step 2: Use setState for Updates

When you want to change the currently displayed quote, you need to ensure that you’re updating the _index within the setState method. This is crucial because it triggers a re-render of the widget, showing the new quote on the screen.

Updated Code Example

Here’s how you can modify your existing code to work correctly:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Full Implementation in UI

To see the random quote upon button press, ensure that the Text widget displays the quote based on the generated index, like this:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Now you have a complete understanding of how to implement a random quote generator in your Flutter application. By defining the index correctly and using setState, you ensure that users see a new random element from your list each time they press the button. This not only enhances the interactivity of your app but also keeps your users engaged with fresh content.

If you follow these steps, you should now be able to create a functional and exciting random text generator in your Flutter project. Happy coding!