Flutter 1.0 - Unable to load text asset - flutter

Question

I'm having some trouble loading text assets in flutter (1.0).
This is the current code attempting to read the asset.
Future<String> get _localPath async {
final directory = await getApplicationDocumentsDirectory();
return directory.path;
}
Future<String> getFileData(String path) async {
return await rootBundle.loadString(path);
}
Future<File> get _localFile async {
final path = await _localPath;
final file = File('$path/toon_test_3.json');
bool exists = file.existsSync();
if(exists){
return file;
} else {
// Load the default file
final newfile = await getFileData('toonRepo/data.json');
return file.writeAsString(newfile);
}
}
loadString will failing popping up the following:
Could not load source 'dart:core/runtime/libobject_patch.dart': <source not available>.
If execution continues the following exception is raised:
Exception has occurred.
FlutterError (Unable to load asset: toonRepo/data.json)
I've tried a lot of solutions here that revolve around the asset section in pubspec.yaml
name: hello_world
description: A new Flutter project.
version: 1.0.0+1
environment:
sdk: ">=2.0.0-dev.68.0 <3.0.0"
dependencies:
path_provider: ^0.4.1
flutter:
sdk: flutter
cupertino_icons: ^0.1.2
english_words: ^3.1.0
dev_dependencies:
flutter_test:
sdk: flutter
flutter:
assets:
- toonRepo/
uses-material-design: true
Am I going wrong somewhere very silly?
Cheers for any pointers you have.
Project Structure
Here is a temporary copy of the code if you want to take a peek.
Github
And here's a stack trace
[VERBOSE-2:shell.cc(184)] Dart Error: Unhandled exception:
Unable to load asset: toonRepo/data.json
#0 PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:221:7)
<asynchronous suspension>
#1 AssetBundle.loadString (package:flutter/src/services/asset_bundle.dart:67:33)
<asynchronous suspension>
#2 CachingAssetBundle.loadString.<anonymous closure> (package:flutter/src/services/asset_bundle.dart:162:56)
#3 __InternalLinkedHashMap&_HashVMBase&MapMixin&_LinkedHashMapMixin.putIfAbsent (dart:collection/runtime/libcompact_hash.dart:284:23)

Answer 1

The asset access works fine with the pubspec.yaml in your question.
new Text("Name: " + toon.info.name)),
fails because toon is null because it never got a value assigned.
You could use new Text("Name: " + (toon?.info?.name ?? 'foo')), to work around the exception.
If you add
widget.storage.getFileData('toonRepo/data.json').then((f) => print(f));
to _FlutterDemoState.initState(), you'll see that reading the asset works just fine.