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Скачать или смотреть How to Save a Uint8List as an Image File in Flutter

  • vlogize
  • 2025-08-12
  • 2
How to Save a Uint8List as an Image File in Flutter
Save a memory image (such as Uint8list) as image file in flutterflutterdartuint8arrayuint8list
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Описание к видео How to Save a Uint8List as an Image File in Flutter

Learn how to easily save `Uint8List` data as image files in Flutter using Dart's built-in libraries. Follow our step-by-step methods to handle images effectively.
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This video is based on the question https://stackoverflow.com/q/65154899/ asked by the user 'M.Taha Basiri' ( https://stackoverflow.com/u/14107431/ ) and on the answer https://stackoverflow.com/a/65155017/ provided by the user 'lsiu' ( https://stackoverflow.com/u/84091/ ) 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: Save a memory image (such as Uint8list) as image file in flutter

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.
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How to Save a Uint8List as an Image File in Flutter: A Step-by-Step Guide

Working with images in Flutter can sometimes pose challenges, especially when you're dealing with binary data types like Uint8List. If you've found yourself wondering how to save a Uint8List as an image file, you're not alone. This guide will walk you through the process, providing an easy-to-follow example using Dart's built-in libraries.

Understanding Uint8List

What is Uint8List?

Uint8List is a typed data list in Dart that represents a sequence of 8-bit unsigned integers. This is commonly used when working with binary data, such as images. When you retrieve image data from a web service or process it within your application, it often comes as a Uint8List. The goal here is to leverage this binary data by saving it as a .jpg file.

Saving a Uint8List as a JPG File in Flutter

Step 1: Import Necessary Libraries

Before you start coding, ensure you have the proper libraries imported. You'll need the dart:io library for file operations and dart:typed_data for handling the Uint8List. Additionally, if you're fetching an image from the web, the http package will be required.

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

Step 2: Fetch the Image Data

In this example, we will retrieve image data from a gravatar URL. You can replace the URL with any source that provides image data in the form of Uint8List. Here’s how you can fetch the image:

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

Step 3: Write the Data to a File

Now that you've fetched the image data, you want to save it as a file. The writeAsBytes method of the File class makes it simple to write Uint8List data to a file. Here’s how you can do this:

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

Putting it all together, here is the complete code:

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

Summary

In just a few simple steps, you can successfully save a Uint8List as an image file in Flutter. Whether you're fetching images from the web or working with images generated within your application, this method provides a straightforward approach to handling image data effectively.

Remember:

Always check for errors when performing file operations.

Customize the file path to ensure that images are saved in your desired location.

Now, you can easily store your Uint8List images as .jpg files and use them throughout your Flutter application!

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