random_pick_letter.dart

import 'dart:async';
import 'dart:convert';
import 'package:flutter/services.dart';
import 'dart:math' show Random;

class RandomPickLetter {
  RandomPickLetter();

  String _letter;
  final random = Random();
  final String _chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

  init() async {
    await letterFromLocalFile();
  }

  Future<void> letterFromLocalFile() async {
    _letter = _chars[random.nextInt(_chars.length)];
  }

  String get letter => _letter;
}