flutter - Is there any way to write to a pre-existing text file in flutter?

Question

I have a txt file that I need to write to. I know that I can't write to this using File IO, so is there any way to write to this file?

标签： flutter

Answer 1

If you want to open the file in append mode you have to pass the file mode in your writeAsString() function else it will over write the file.

import 'dart:async';
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:path_provider/path_provider.dart';

Future<File> writeCounter(int counter) async {
final file = await  File('your_path.txt');

  // Write the file
  return file.writeAsString('$counter',mode: FileMode.append);
 }
}