无法在所有平台上读取 Flutter 中的文件，该文件在 linux 桌面上可以看到但 web(chrome) 看不到它，android 也看不到

Question

import 'dart:io';
import 'package:path/path.dart';

Future<Map?> readFile(lang) async {
  var pathToFile = join(dirname(Platform.script.toFilePath()), 'text', '$lang.toml');
  var document = File(pathToFile);
  return document;
}

So I have a text directory in my flutter root directory which contains some TOML files, I have no trouble accessing these files on linux but as soon as I run this on android I get a (OS Error: No such file or directory, errno = 2) , and same on web but without the error message, it just returns null, I have also tried this as well:

var document = File('text/$lang.toml');

once again, same result. I have seen people use the path_provider package for this but it didn't work anyway, and I would also like to have web compatibility. Anyone know how to solve this? TY

Answer 1

When using shipped assets, you shouldn't use the host's file system. Instead use the rootBundle from flutter/services .

import 'package:flutter/services.dart';

...

Future<String> readFile(String lang) {
  return rootBundle.loadString('text/$lang.toml');
}

Assuming the file is in a text/ directory at the root of your project and it is defined in the pubspec.yaml :

flutter:
  assets:
    - text/

The fact that it worked on Linux is kind of a coincidence, since you're running and developing on the same machine. This solution should work independent of which platform you're targeting.