pubspec.yaml に記述
dependencies:
just_audio: ^0.9.30 #オーディオ
intl: ^0.17.0 #時刻系
shared_preferences: ^2.0.15 #設定保存・ロード系
google_mobile_ads: ^0.13.2+1 #広告
flutter_screenutil: ^5.3.1 #表示の統一
firebase_core: ^1.13.1 #Firebase
cloud_firestore: ^3.1.10 #Fire Storage
bordered_text: ^2.0.0 #テキストの縁取り
//================================================================
//util.dart
//便利関数群
//================================================================
import 'dart:math';
import 'package:just_audio/just_audio.dart';
import 'package:audio_session/audio_session.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:intl/intl.dart';