How to Save Multiple Color Data in Flutter with Firebase and SharedPreferences

Learn how to effectively save user color selections using Firebase Firestore or SharedPreferences in your Flutter app.
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This video is based on the question https://stackoverflow.com/q/66708724/ asked by the user 'Doğukan Baybars' ( https://stackoverflow.com/u/14942209/ ) and on the answer https://stackoverflow.com/a/66709006/ provided by the user 'quoci' ( https://stackoverflow.com/u/9936384/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Color Data Storage Problem in Flutter

Creating an interactive app often requires users to customize their experience, and one popular customization option is the ability to select colors. However, what happens when users want their selected colors saved for future sessions? This guide addresses a common question: How can developers save multiple color data in a Flutter application?

The Challenge: Dynamic Color Selection

In this scenario, you're building a Flutter app that allows users to change the color of containers by tapping or double-tapping them. As users select colors, you want to save this information, either into a Firebase Firestore database or using SharedPreferences for local storage. Additionally, handling multiple containers can complicate the situation as you want to track colors individually.

Initial Code Structure

In the existing code, users toggle their selected color with taps and double taps:

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Here, _color is toggled between blue and red states. Now, let's learn how to make this color persistent across app sessions.

Solution: Saving Color Data

Step 1: Initialize Color Storage

To save the selected color, you'll need to integrate the SharedPreferences package. This allows you to store simple data such as integers or strings locally on the device.

Here’s how to save the color selection when a user taps on the container:

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Step 2: Retrieving Stored Color

When users start the app again, you want to read the saved color from SharedPreferences:

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This approach ensures that any color the user previously selected will be loaded back into the app upon restart.

Considerations for Multiple Containers

If you have multiple containers, you’ll need to manage their colors individually. Here's a simple strategy you can adopt:

Use a list or a map to keep track of the colors for each container.

Assign unique keys in SharedPreferences for each container color storage, such as colorKey1, colorKey2, etc.

Example Modification for Multiple Colors

Here’s a modification to handle more than one color dynamically:

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Conclusion

Saving multiple colors in your Flutter app can greatly enhance user experience by providing persistence of their selections. By leveraging SharedPreferences, you can efficiently store and retrieve user preferences. If your app scales up with numerous containers, ensure you have a robust way to handle color states without cluttering your code.

With this guide, you can now implement color data storage in your Flutter applications confidently! Happy coding!