Switching Images Based on Theme in Flutter

Learn how to dynamically switch images in your Flutter app depending on the theme, addressing common challenges with dark and light modes.
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This video is based on the question https://stackoverflow.com/q/67987326/ asked by the user 'Mathis' ( https://stackoverflow.com/u/16233620/ ) and on the answer https://stackoverflow.com/a/67990696/ provided by the user 'Jonathan Ixcayau' ( https://stackoverflow.com/u/11891580/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Switching Images Based on Theme in Flutter: A Step-by-Step Guide

Creating an appealing and functional app involves ensuring that your interface adapts beautifully regardless of the user's preferences. A common issue developers face is switching images depending on the theme—especially when working with dark and light modes. In this guide, we'll explore how to dynamically change your Flutter app's logo based on the current theme, ensuring that it always looks great and maintains visibility. Let’s dive in!

Understanding the Problem

When using dark and light themes, you may encounter situations where your logo becomes indistinguishable against the background. For example, on a black background in dark mode, a logo with black outlines may appear invisible. On the other hand, the same logo may be perfectly visible on a white background in light mode.

To tackle this issue, we need to implement logic within our Flutter app that senses the current theme and adjusts the asset being displayed accordingly.

Implementation Steps

We’ll break down the solution into clear, actionable steps:

Step 1: Set Up Your Themes

First, ensure that you've defined your themes clearly in a separate theme file. You already have two themes, light and dark, set up like this:

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Step 2: Detect the Current Theme

To switch images dynamically, we need to check the current platform brightness (i.e., whether it's set to dark or light mode) using the MediaQuery class. Place the following code in your widget:

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This code will help us determine if the dark mode is enabled.

Step 3: Switch Image Assets Accordingly

Now we can alter the way we display the logo based on the detected theme. Replace the asset path in your SvgPicture.asset widget with the following code:

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Here, you'll specify two different paths for your logo: one for when dark mode is active and another for light mode.

Step 4: Adjust Colors If Necessary

You can take this dynamic capability further. Just as you switch image assets, you can also modify other properties such as colors depending on the theme. For instance:

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Example Integration

Here’s how the complete implementation may look within your existing widget structure:

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Conclusion

By following these steps, you're now equipped to dynamically switch images in your Flutter application based on the theme. It’s a small enhancement that can significantly improve your app’s user experience by ensuring your graphics are always visually appealing. Now, go ahead and implement this functionality in your project, and watch your app's interface shine, no matter the mood of the user!