Скачать или смотреть How to Save Your QR Generated Image into Gallery Using Flutter

Learn how to save a generated QR code image to your gallery in Flutter, addressing common pitfalls and providing a simple solution.
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This video is based on the question https://stackoverflow.com/q/65627386/ asked by the user 'Jayesh Choudhary' ( https://stackoverflow.com/u/14713108/ ) and on the answer https://stackoverflow.com/a/65627589/ provided by the user 'Adelina' ( https://stackoverflow.com/u/4679965/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Save Your QR Generated Image into Gallery Using Flutter

Generating QR codes and saving them as images is a common task in Flutter apps, but it can lead to frustrating issues, such as saving a blank image instead of the desired QR code. If you're facing this problem, don't worry—this guide will walk you through the solution step by step.

The Problem: Black Image Instead of QR Code

When you attempt to save a QR code generated image using Flutter's RenderRepaintBoundary, you might encounter a frustrating issue: the saved image appears to be completely black. This typically occurs due to the background being transparent when the image is rendered. So how do you resolve this and ensure you save the QR code correctly?

The Solution

The solution is straightforward: you need to wrap your QrImage widget with a container that has a white background. This will ensure that when you render the QR code, it does not save a transparent image but rather an image with a visible background.

Step-by-Step Instructions

Wrap Your QrImage with a Container: This step involves modifying the widget hierarchy to include a Container for the background. Here’s how to do it:

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

Rendering the Image: After you have made the above changes, you should now be able to successfully render the image and save it. Below is the complete code that you've initially provided, with the adjustment made to avoid the black image:

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

Additional Tips

Testing Locally: Make sure to test the path where you are saving the file. Providing an incorrect path can lead to file not found errors.

Permissions: If you are targeting Android, ensure your app has the necessary permissions to write to external storage. You can add permissions in your AndroidManifest.xml.

Image Quality: Adjust the size ratio in the QrImage widget to ensure your QR code has good readability.

Conclusion

By following these steps, you should be able to save your generated QR code images in Flutter without encountering the annoying black image issue. Wrapping the QR image with a container that has a solid background color is a simple yet effective solution. Happy coding!