Can't Read file from the asset?

Issue

In my app, there is a button that will copy the file(in my case txt) to the local download folder. I even ask permission from the phone and it works. But when I read from the txt file, the error said

FileSystemException: Cannot open file, path = 'assets/readme.txt' (OS Error: No such file or directory, errno = 2)

import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'dart:io';
import "package:path_provider/path_provider.dart";
 
void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
int a;
  @override
  Widget build(BuildContext context) {
    
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("What up"),
        ),
        body: Center(
          child: RaisedButton(
            onPressed: () async {
              await Permission.storage.request();
              if (PermissionStatus == PermissionStatus.granted) {
                print("permission granted");
              }
              if (PermissionStatus == PermissionStatus.denied) {
                print('permission denied');
              }
             var path = "assets/readme.txt";
             a = await readCounter();
             print(a);
            },
            child: Text("Press me"),
             
          ),
        ),
      ),
    );
  }
}


Future<int> readCounter() async {
  try {
    final file = File("assets/readme.txt");

    // Read the file.
    String contents = await file.readAsString();

    return int.parse(contents);
  } catch (e) {
    // If encountering an error, return 0.
    print(e);
  }
}

I add this code in android>app>src>main>AndroidMainfest.xml

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

I also add the asset folder in pubspec.yaml

flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
    - assets/

Solution

The File class references a file in the whole file system of the device, not the assets of the application.

To access assets you should follow what is stated in the documentation.

1. Import the flutter services import 'package:flutter/services.dart'
2. Use the rootBundle to access the AssetBundle
3. Use the loadString method to access the data inside your asset with the specified path await rootBundle.loadString('assets/readme.txt');

---

Implementation in your code:

Future<int> readCounter() async {
  try {
    String contents = await rootBundle.loadString('assets/readme.txt');

    return int.parse(contents);
  } catch (e) {
    // If encountering an error, return 0.
    print(e);
  }
}

Answered By - Christopher Moore