Скачать или смотреть Fixing Extra assets/images/ Prefix in Flame's loadSprite() on Flutter Web

Learn how to resolve the issue of duplicated asset path prefix 'assets/images/' when using Flame's loadSprite() in Flutter Web, ensuring correct asset loading.
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This video is based on the question https://stackoverflow.com/q/79532034/ asked by the user 'Ishan2077' ( https://stackoverflow.com/u/13998290/ ) and on the answer https://stackoverflow.com/a/79535504/ provided by the user 'spydon' ( https://stackoverflow.com/u/789545/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Asset Path Issue in Flame's loadSprite() on Flutter Web

When developing Flutter games with Flame, a common problem arises: assets fail to load on Flutter Web due to an unexpected duplicated path prefix like assets/images/, causing 404 errors.

For example, loading an image at assets/start_screen_ui/manual.png may result in a failed fetch from assets/assets/images/start_screen_ui/manual.png.



Root Cause

Flame's default image cache prefix is set to 'assets/images/'. This means when you call:

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

Flame prepends 'assets/images/' to the path, making the effective path:

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

On Web, this leads to duplication if your pubspec.yaml only defines assets under assets/ without an images/ folder, causing incorrect lookup paths.



How to Fix

1. Adjust Flame's Image Cache Prefix

Override Flame's default prefix by setting it to match your asset folder structure:

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

This should be set before loading any images, typically in the game initialization or the main() function.

2. Use Consistent Asset Paths

Ensure in your asset loading calls that you use paths relative to the prefix:

If prefix is 'assets/', load 'start_screen_ui/manual.png'.

If prefix was left as default 'assets/images/', ensure your assets are organized under assets/images/.

3. Verify pubspec.yaml

Declare assets like this to match your project structure:

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

Avoid redundant or conflicting asset directories.

4. Cleaning and Rebuilding

Sometimes, Flutter Web's asset manifest may cache old paths. Run:

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

To ensure the manifest is regenerated correctly.



Summary

Flame's default image prefix is 'assets/images/'.

If your assets are actually under 'assets/', set Flame.images.prefix = 'assets/';.

Adjust your asset load calls to be relative to this prefix.

Keep pubspec.yaml clean and consistent with your asset folders.

This simple prefix adjustment ensures your assets load correctly across mobile and Flutter Web.



Example Usage

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

Then load sprites as usual:

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

This will correctly resolve to assets/start_screen_ui/manual.png.