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@mono0926
Last active November 9, 2022 05:29
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import 'dart:async';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:google_mobile_ads/google_mobile_ads.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:shared_preferences/shared_preferences.dart';
final sharedPreferencesProvider = Provider<SharedPreferences>(
(ref) => throw UnimplementedError(),
);
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
late final SharedPreferences sharedPreferences;
await Future.wait(
[
Future(() async {
sharedPreferences = await SharedPreferences.getInstance();
}),
// 順番関係なく並行して実行して良い非同期処理群書いたり、
// SharedPreferencesのようにインスタンス取得が非同期のものを同様に処理したり
// (単純にawaitの直列で書くと、処理時間がその合計になって無駄な一方、
// Future.waitで並行処理にしておくと概ねその中の最長のものの処理時間で済む)
Firebase.initializeApp(),
MobileAds.instance.initialize(),
],
);
runApp(
ProviderScope(
overrides: [
sharedPreferencesProvider.overrideWithValue(sharedPreferences),
],
child: Consumer(
builder: (context, ref, child) {
// 上記のように起動時に取得を済ませてRiverpodで取れるようにしておくと、
// それ以降同期的に取得できて便利
print(ref.watch(sharedPreferencesProvider).get('test'));
return child!;
},
child: const MaterialApp(
home: Scaffold(
body: Text('hello'),
),
),
),
),
);
}
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