Flutter Package Reading its Own Assets

Question

I have an module with an 'assets' folder located in the same directory as my pubspec.yaml file. In my assets folder I have test.txt, and simpleObject.json.

flutter:
  assets:
    - assets/test.txt
    - assets/simpleObject.json

I believe the following code should then allow me to read it into my app.

var test = await DefaultAssetBundle.of(context).loadString("assets/test.txt");

Sadly I get the following error:

[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Unable to load asset: assets/test.txt

The error comes from the asset_bundle.dart. I have to assume this is my fault, but according to everything I've read I'm doing it correctly. Any thoughts?

Here is my file structure if it helps.

MyModule
    |_assets/test.txt
    |_lib/
    |_pubspec.yaml

Did you try it with `rootBundle` and make sure you stop the app process and make a fresh app run. — CopsOnRoad, May 29 '19 at 18:24
And what about your `simpleObject.json` does it get loaded successfully? — CopsOnRoad, May 29 '19 at 18:31
OK, can you show the directory tree where you have added these files? — CopsOnRoad, May 29 '19 at 18:41
Everything seems to be fine if you have also run `flutter packages get`. — CopsOnRoad, May 29 '19 at 19:02
yeah, I ran flutter packages get on both the module and the app hosting it. — eimmer, May 29 '19 at 19:05

score 19 · Accepted Answer · answered Jun 11 '19 at 17:06

19

I got a solution. Even though my package was trying to load its own asset, it still had to specify itself as the location.

Here is how my_package loads an image asset (specifying the package), uses it in a widget, and that widget is easily used by outside apps.

Image.asset(AssetImage("assets/splash.png").assetName, package: 'my_package',);

answered Jun 11 '19 at 17:06

eimmer

1,537
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3

Another solution can be: Image.asset('packages//assets/splash.png'); – Dominic Orga Jan 26 '21 at 12:47
@DominicOrga you just saved my day! Please add your solution as an answer so that others can see... Comments are not often read – Bronx Jan 28 '21 at 14:17
did you also find a solution for loading assets which are not images? – tmaihoff Nov 01 '21 at 14:48

score 14 · Answer 2 · answered Jan 29 '21 at 23:10

14

This is a bit late, but another solution can be:

Image.asset('packages/<package_name>/assets/splash.png');

answered Jan 29 '21 at 23:10

Dominic Orga

457
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12

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This is a great way if there is no package argument, like a `RiveAnimation.asset(...)` constructor. – Giffesnaffen Feb 19 '22 at 20:58

score 0 · Answer 3 · answered Jun 07 '19 at 02:45

0

I encountered this problem and took a lot of time before it was resolved. The solution was to downgrade to a previous version (git checkout v1.5.4-hotfix.2)

answered Jun 07 '19 at 02:45

Nabil Boucharour

21
1

Flutter Package Reading its Own Assets

3 Answers3

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