storage.dart

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

class TodoStorage {
  static Future<String> get _localPath async {
    final directory = await getApplicationDocumentsDirectory();
    return directory.path;
  }

  static Future<File> get _localFile async {
    final path = await _localPath;
    final file = File('$path/todo.txt');
    file.createSync();
    return file;
  }

  static Future<List<String>> readAllTodos() async {
    try {
      final file = await _localFile;

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

      return contents.split("\n");
    } catch (e) {
      print(e);
      return new List<String>.generate(10, (i) => "Item $i");
    }
  }

  static Future<List<String>> addNewTodo(String todo) async {
    final file = await _localFile;
    String contents = await file.readAsString() + "\n" + todo;
    // Write the file
    file.writeAsString(contents);

    return contents.split("\n");
  }
}