{"id":605,"date":"2021-04-29T18:32:45","date_gmt":"2021-04-29T09:32:45","guid":{"rendered":"http:\/\/localhost:8000\/?p=605"},"modified":"2021-05-16T18:43:17","modified_gmt":"2021-05-16T09:43:17","slug":"flutter-background-timer-app","status":"publish","type":"post","link":"http:\/\/localhost:8000\/2021\/04\/flutter-background-timer-app.html","title":{"rendered":"Flutter \u3067\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u3067\u3082\u52d5\u304f\u30bf\u30a4\u30de\u30fc\u30a2\u30d7\u30ea\u3092\u4f5c\u3063\u305f"},"content":{"rendered":"<p><img src=\"http:\/\/localhost:8000\/wp-content\/uploads\/2021\/04\/logo_lockup_flutter_horizontal-400x112.png\" alt=\"\" \/><\/p>\n<p>\u5c11\u3057\u524d\u306b\u4f1a\u793e\u306e\u30d6\u30ed\u30b0\u3067\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3092\u66f8\u304d\u307e\u3057\u305f\u3002<br \/>\n<a href=\"https:\/\/lab.astamuse.co.jp\/entry\/flutter-timer-app\">Flutter\u3067\u304a\u52c9\u5f37\u6642\u9593\u7ba1\u7406\u7528\u306e\u30bf\u30a4\u30de\u30fc\u30a2\u30d7\u30ea\u3092\u4f5c\u3063\u305f<\/a><\/p>\n<p>\u3053\u306e\u30a2\u30d7\u30ea\u306b\u306f\u3001\u300c\u30a2\u30d7\u30ea\u304c\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3059\u308b\u3068\u30bf\u30a4\u30de\u30fc\u304c\u505c\u6b62\u3057\u3066\u3057\u307e\u3046\u300d\u3068\u3044\u3046\u81f4\u547d\u7684\u306a\u554f\u984c\u304c\u3042\u308a\u307e\u3057\u305f\u304c\u3001\u305d\u306e\u5bfe\u51e6\u65b9\u6cd5\u304c\u5206\u304b\u3063\u305f\u306e\u3067\u3001\u7d39\u4ecb\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<h2>\u554f\u984c\u70b9<\/h2>\n<p>\u30a2\u30d7\u30ea\u304c\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3059\u308b\u3068\u3001\u30a2\u30d7\u30ea\u304c\u4e00\u6642\u505c\u6b62\u3057\u3066\u3057\u307e\u3044\u3001\u30bf\u30a4\u30de\u30fc\u304c\u6b62\u307e\u3063\u3066\u3057\u307e\u3046\u3002<\/p>\n<h2>\u5bfe\u5fdc\u65b9\u91dd<\/h2>\n<p>\u30a2\u30d7\u30ea\u304c\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3068\u3001\u30d5\u30a9\u30a2\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u5fa9\u5e30\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u4ee5\u4e0b\u306e\u51e6\u7406\u3092\u884c\u3046\u4f5c\u6226\u3067\u3044\u3053\u3046\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30c9\u306b\u9077\u79fb\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0\n<ul>\n<li>\u305d\u306e\u6642\u70b9\u306e\u6642\u9593\u3092\u5143\u306b\u3001\u30ed\u30fc\u30ab\u30eb\u901a\u77e5\u3092\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u767b\u9332\u3059\u308b\uff08\u30ed\u30fc\u30ab\u30eb\u901a\u77e5\u306f\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u3067\u3082\u6642\u9593\u304c\u304f\u308c\u3070\u5b9f\u884c\u3055\u308c\u308b\uff09<\/li>\n<li>\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u305f\u65e5\u6642\u3092\u8a18\u9332\u3059\u308b<\/li>\n<\/ul>\n<\/li>\n<li>\u30d5\u30a9\u30a2\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u5fa9\u5e30\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0\n<ul>\n<li>\u30ed\u30fc\u30ab\u30eb\u901a\u77e5\u30bf\u30a4\u30de\u30fc\u3092\u505c\u6b62\u3059\u308b<\/li>\n<li>\u30d5\u30a9\u30a2\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u5fa9\u5e30\u3057\u305f\u65e5\u6642\u3068\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u305f\u65e5\u6642\u306e\u5dee\u5206\u3092\u3001\u30bf\u30a4\u30de\u30fc\u306b\u53cd\u6620\u3059\u308b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u6ce8\uff09 Flutter \u3067\u306f\u30a2\u30d7\u30ea\u3092\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u3067\u8d77\u52d5\u3055\u305b\u3063\u3071\u306a\u3057\u306b\u3059\u308b\u65b9\u6cd5\u306f\u306a\u3055\u305d\u3046\u306a\u306e\u3067\u3001\u4e0a\u8a18\u3092\u63a1\u7528\u3057\u307e\u3057\u305f\u3002<\/p>\n<h2>Flutter \u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30a4\u30d9\u30f3\u30c8<\/h2>\n<p>Flutter \u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30a4\u30d9\u30f3\u30c8\u3092\u30ea\u30c3\u30b9\u30f3\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001iOS \u306f<a href=\"https:\/\/flutter.dev\/docs\/get-started\/flutter-for\/ios-devs#how-do-i-listen-to-ios-lifecycle-events\">\u3053\u3061\u3089<\/a> \u3001Android\u306f <a href=\"https:\/\/flutter.dev\/docs\/get-started\/flutter-for\/android-devs#how-do-i-listen-to-android-activity-lifecycle-events\">\u3053\u3061\u3089<\/a> \u306b\u8a18\u8f09\u3055\u308c\u3066\u304a\u308a\u3001\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30a4\u30d9\u30f3\u30c8\u306eEnum\u5024\u306e\u8aac\u660e\u3082 <a href=\"https:\/\/api.flutter.dev\/flutter\/dart-ui\/AppLifecycleState-class.html\">\u3053\u3061\u3089<\/a> \u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>inactive\n<ul>\n<li>\u30a2\u30d7\u30ea\u306f\u30d5\u30a9\u30a2\u30b0\u30e9\u30a6\u30f3\u30c9\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u304c\u3001\u975e\u30a2\u30af\u30c6\u30a3\u30d6\uff08\u30e6\u30fc\u30b6\u30a4\u30f3\u30d7\u30c3\u30c8\u3092\u53d7\u3051\u4ed8\u3051\u306a\u3044\uff09\u306a\u72b6\u614b<\/li>\n<li>iOS\u3067\u306f\u3001\u901a\u8a71\u4e2d\u3001TouchID\u30ea\u30af\u30a8\u30b9\u30c8\u3078\u306e\u5fdc\u7b54\u6642\u3001\u30a2\u30d7\u30ea\u30b9\u30a4\u30c3\u30c1\u30e3\u30fc\u307e\u305f\u306f\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u30bb\u30f3\u30bf\u30fc\u306b\u5165\u308b\u3068\u304d\u3001\u307e\u305f\u306fFlutter\u30a2\u30d7\u30ea\u3092\u30db\u30b9\u30c8\u3057\u3066\u3044\u308bUIViewController\u306b\u79fb\u884c\u4e2d\u306e\u72b6\u614b<\/li>\n<li>Android\u3067\u306f\u3001\u5206\u5272\u753b\u9762\u30a2\u30d7\u30ea\u3001\u96fb\u8a71\u3001\u30d4\u30af\u30c1\u30e3\u30fc\u30a4\u30f3\u30d4\u30af\u30c1\u30e3\u30fc\u30a2\u30d7\u30ea\u3001\u30b7\u30b9\u30c6\u30e0\u30c0\u30a4\u30a2\u30ed\u30b0\u3001\u5225\u306e\u30a6\u30a3\u30f3\u30c9\u30a6\u306a\u3069\u3001\u5225\u306e\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u306b\u7126\u70b9\u3092\u5408\u308f\u305b\u308b\u3068\u3001\u30a2\u30d7\u30ea\u306f\u3053\u306e\u72b6\u614b\u306b\u79fb\u884c\u3059\u308b<\/li>\n<li>\u3053\u306e\u72b6\u614b\u306e\u30a2\u30d7\u30ea\u306f\u3044\u3064<code>paused<\/code>\u306b\u79fb\u884c\u3057\u3066\u3082\u304a\u304b\u3057\u304f\u306a\u3044\u524d\u63d0\u306b\u306a\u3063\u3066\u3044\u308b<\/li>\n<\/ul>\n<\/li>\n<li>paused\n<ul>\n<li>\u30a2\u30d7\u30ea\u304c\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u305f\u72b6\u614b<\/li>\n<li>\u30a2\u30d7\u30ea\u306f\u8868\u793a\u3055\u308c\u3066\u304a\u3089\u305a\u3001\u30e6\u30fc\u30b6\u5165\u529b\u306b\u5fdc\u7b54\u3057\u306a\u3044<\/li>\n<\/ul>\n<\/li>\n<li>resumed\n<ul>\n<li>\u30a2\u30d7\u30ea\u304c\u30d5\u30a9\u30a2\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u5fa9\u5e30\u3057\u305f\u72b6\u614b<\/li>\n<li>\u30a2\u30d7\u30ea\u306f\u8868\u793a\u3055\u308c\u3001\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u306b\u5fdc\u7b54\u3059\u308b<\/li>\n<\/ul>\n<\/li>\n<li>detached\n<ul>\n<li>\u30a2\u30d7\u30ea\u306f Flutter \u3067\u30db\u30b9\u30c8\u3055\u308c\u3066\u3044\u308b\u304c\u3001\u30d3\u30e5\u30fc\u304b\u3089\u306f\u5207\u308a\u96e2\u3055\u308c\u3066\u3044\u308b<\/li>\n<li>\u30a2\u30d7\u30ea\u8d77\u52d5\u4e2d\uff08\u30a8\u30f3\u30b8\u30f3\u304c\u521d\u671f\u5316\u3055\u308c\u3066\u30d3\u30e5\u30fc\u3092\u30a2\u30bf\u30c3\u30c1\u4e2d\uff09\u304b\u7d42\u4e86\u4e2d\u306e\u72b6\u614b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u5b9f\u969b\u306b\u8a66\u3057\u3066\u307f\u308b\u3068\u3001\u4eca\u56de\u306f <code>paused<\/code>\u30fb<code>resumed<\/code> \u306b\u9077\u79fb\u3059\u308b\u30a4\u30d9\u30f3\u30c8\u3092\u62fe\u3063\u3066\u3001\u300c\u5bfe\u5fdc\u65b9\u91dd\u300d\u306b\u66f8\u3044\u305f\u3053\u3068\u3092\u5b9f\u884c\u3059\u308c\u3070\u826f\u3055\u305d\u3046\u3067\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u3053\u306e\u30a4\u30d9\u30f3\u30c8\u3092\u3059\u308b\u65b9\u6cd5\u306f\u3068\u3066\u3082\u7c21\u5358\u3067\u3059\u3002<\/p>\n<p>State\u30af\u30e9\u30b9\u3067<code>WidgetsBindingObserver<\/code>\u3092\u7d99\u627f\u3057\u3066\u3042\u3052\u3066\u3001<code>initState()<\/code>\u3067<code>addObserver()<\/code>\u3092\u5b9f\u884c\u3057\u3066\u3001<code>didChangeAppLifecycleState()<\/code>\u3092\u4e0a\u66f8\u304d\u3057\u3066\u3042\u3052\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<pre><code class=\"language-dart\">class _TimerPageState extends State&lt;TimerPage&gt; with WidgetsBindingObserver {\n\n  @override\n  void initState() {\n    super.initState();\n    WidgetsBinding.instance.addObserver(this);\n  }\n\n  @override\n  void dispose() {\n    WidgetsBinding.instance.removeObserver(this);\n    super.dispose();\n  }\n\n@override\n  void didChangeAppLifecycleState(AppLifecycleState state) {\n    print(state); \/\/ \u597d\u304d\u306a\u51e6\u7406\u3092\u66f8\u304f\n  }\n}<\/code><\/pre>\n<h2>\u30bf\u30a4\u30de\u30fc\u30a2\u30d7\u30ea\u306e\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u5bfe\u5fdc<\/h2>\n<p>\u8aac\u660e\u7528\u306b10\u79d2\u3092\u30ab\u30a6\u30f3\u30c8\u30c0\u30a6\u30f3\u3059\u308b\u3060\u3051\u306e\u30a2\u30d7\u30ea\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n<p><img src=\"http:\/\/localhost:8000\/wp-content\/uploads\/2021\/04\/background_timer_loop.gif\" alt=\"\" \/><\/p>\n<p>\u30a2\u30d7\u30ea\u304c\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u3066\u3082\u3001<\/p>\n<ul>\n<li>\u6642\u9593\u304c\u30bc\u30ed\u306b\u306a\u3063\u305f\u3089\u901a\u77e5\u3092\u98db\u3070\u3059<\/li>\n<li>\u6642\u9593\u304c\u30bc\u30ed\u306b\u306a\u308b\u524d\u306b\u30d5\u30a9\u30a2\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u5fa9\u5e30\u3057\u305f\u3089\u3001\u901a\u77e5\u3092\u30ad\u30e3\u30f3\u30bb\u30eb\u3057\u3066\u3001\u6642\u9593\u3092\u9032\u3081\u308b<\/li>\n<\/ul>\n<p>\u3068\u3044\u3046\u5bfe\u5fdc\u3092\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-dart\">import &#039;dart:async&#039;;\n\nimport &#039;package:flutter\/material.dart&#039;;\nimport &#039;package:flutter_local_notifications\/flutter_local_notifications.dart&#039;;\nimport &#039;package:intl\/intl.dart&#039;;\nimport &#039;package:timezone\/data\/latest.dart&#039; as tz;\nimport &#039;package:timezone\/timezone.dart&#039; as tz;\n\nvoid main() async {\n  _setupTimeZone();\n  runApp(TimerApp());\n}\n\n\/\/ \u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u3092\u8a2d\u5b9a\u3059\u308b\nFuture&lt;void&gt; _setupTimeZone() async {\n  tz.initializeTimeZones();\n  var tokyo = tz.getLocation(&#039;Asia\/Tokyo&#039;);\n  tz.setLocalLocation(tokyo);\n}\n\n\/\/\/ \u30bf\u30a4\u30de\u30fc\u30a2\u30d7\u30ea\nclass TimerApp extends StatelessWidget {\n  @override\n  Widget build(BuildContext context) {\n    return MaterialApp(\n      title: &#039;Life cycle Event Sample Timer&#039;,\n      theme: ThemeData(\n        primarySwatch: Colors.blue,\n      ),\n      home: TimerPage(title: &#039;Life cycle Event Sample Timer&#039;),\n    );\n  }\n}\n\n\/\/\/ \u30bf\u30a4\u30de\u30fc\u30da\u30fc\u30b8\nclass TimerPage extends StatefulWidget {\n  TimerPage({Key key, this.title}) : super(key: key);\n  final String title;\n  @override\n  _TimerPageState createState() =&gt; _TimerPageState();\n}\n\n\/\/\/ \u30bf\u30a4\u30de\u30fc\u30da\u30fc\u30b8\u306e\u72b6\u614b\u3092\u7ba1\u7406\u3059\u308b\u30af\u30e9\u30b9\nclass _TimerPageState extends State&lt;TimerPage&gt; with WidgetsBindingObserver {\n  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();\n  Timer _timer; \/\/ \u30bf\u30a4\u30de\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\n  DateTime _time = DateTime.utc(0, 0, 0).add(Duration(seconds: 10)); \/\/ \u30bf\u30a4\u30de\u30fc\u3067\u7ba1\u7406\u3057\u3066\u3044\u308b\u6642\u9593\u300210\u79d2\u3092\u30ab\u30a6\u30f3\u30c8\u30c0\u30a6\u30f3\u3059\u308b\u8a2d\u5b9a\n  bool _isTimerPaused = false; \/\/ \u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u305f\u969b\u306b\u30bf\u30a4\u30de\u30fc\u304c\u3082\u3068\u3082\u3068\u8d77\u52d5\u4e2d\u3067\u3001\u505c\u6b62\u3057\u305f\u304b\u3069\u3046\u304b\n  DateTime _pausedTime; \/\/ \u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u305f\u6642\u9593\n  int _notificationId; \/\/ \u901a\u77e5ID\n\n  \/\/\/ \u521d\u671f\u5316\u51e6\u7406\n  @override\n  void initState() {\n    super.initState();\n    WidgetsBinding.instance.addObserver(this);\n  }\n\n  \/\/\/ \u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u304c\u5909\u66f4\u3055\u308c\u305f\u969b\u306b\u547c\u3073\u51fa\u3055\u308c\u308b\u95a2\u6570\u3092override\u3057\u3066\u3001\u5909\u66f4\u3092\u691c\u77e5\n  @override\n  void didChangeAppLifecycleState(AppLifecycleState state) {\n    if (state == AppLifecycleState.paused) {\n      \/\/ \u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u305f\u6642\n      setState(_handleOnPaused);\n    } else if (state == AppLifecycleState.resumed) {\n      \/\/ \u30d5\u30a9\u30a2\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u5fa9\u5e30\u3057\u305f\u6642\n      setState(_handleOnResumed);\n    }\n  }\n\n  \/\/\/ \u30a2\u30d7\u30ea\u304c\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u305f\u969b\u306e\u30cf\u30f3\u30c9\u30e9\n  void _handleOnPaused() {\n    if (_timer.isActive) {\n      _isTimerPaused = true;\n      _timer.cancel(); \/\/ \u30bf\u30a4\u30de\u30fc\u3092\u505c\u6b62\u3059\u308b\n    }\n    _pausedTime = DateTime.now(); \/\/ \u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u305f\u6642\u9593\u3092\u8a18\u9332\n    _notificationId = _scheduleLocalNotification(_time.difference(DateTime.utc(0, 0, 0))); \/\/ \u30ed\u30fc\u30ab\u30eb\u901a\u77e5\u3092\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u767b\u9332\n  }\n\n  \/\/\/ \u30a2\u30d7\u30ea\u304c\u30d5\u30a9\u30a2\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u5fa9\u5e30\u3057\u305f\u969b\u306e\u30cf\u30f3\u30c9\u30e9\n  void _handleOnResumed() {\n    if (_isTimerPaused == null) return; \/\/ \u30bf\u30a4\u30de\u30fc\u304c\u52d5\u3044\u3066\u306a\u3051\u308c\u3070\u4f55\u3082\u3057\u306a\u3044\n    Duration backgroundDuration = DateTime.now().difference(_pausedTime); \/\/ \u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u3067\u306e\u7d4c\u904e\u6642\u9593\n    \/\/ \u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u3067\u306e\u7d4c\u904e\u6642\u9593\u304c\u7d42\u4e86\u4e88\u5b9a\u3092\u8d85\u3048\u3066\u3044\u305f\u5834\u5408\uff08\u3053\u306e\u5834\u5408\u306f\u901a\u77e5\u5b9f\u884c\u6e08\u307f\u306e\u306f\u305a\uff09\n    if (_time.difference(DateTime.utc(0, 0, 0)).compareTo(backgroundDuration) &lt; 0) {\n      _time = DateTime.utc(0, 0, 0); \/\/ \u6642\u9593\u3092\u30ea\u30bb\u30c3\u30c8\u3059\u308b\n    } else {\n      _time = _time.add(-backgroundDuration); \/\/ \u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u7d4c\u904e\u6642\u9593\u5206\u6642\u9593\u3092\u9032\u3081\u308b\n      _startTimer(); \/\/ \u30bf\u30a4\u30de\u30fc\u3092\u518d\u958b\u3059\u308b\n    }\n    if (_notificationId != null) flutterLocalNotificationsPlugin.cancel(_notificationId); \/\/ \u901a\u77e5\u3092\u30ad\u30e3\u30f3\u30bb\u30eb\n    _isTimerPaused = false; \/\/ \u30ea\u30bb\u30c3\u30c8\n    _notificationId = null; \/\/ \u30ea\u30bb\u30c3\u30c8\n    _pausedTime = null;\n  }\n\n  \/\/ \u30bf\u30a4\u30de\u30fc\u3092\u958b\u59cb\u3059\u308b\n  void _startTimer() {\n    _timer = Timer.periodic(Duration(seconds: 1), (Timer timer) {\n      setState(() {\n        _time = _time.add(Duration(seconds: -1));\n        _handleTimeIsOver();\n      });\n    }); \/\/ 1\u79d2\u305a\u3064\u6642\u9593\u3092\u6e1b\u3089\u3059\n  }\n\n  \/\/ \u6642\u9593\u304c\u30bc\u30ed\u306b\u306a\u3063\u305f\u3089\u30bf\u30a4\u30de\u30fc\u3092\u6b62\u3081\u308b\n  void _handleTimeIsOver() {\n    if (_timer != null &amp;&amp; _timer.isActive &amp;&amp; _time != null &amp;&amp; _time == DateTime.utc(0, 0, 0)) {\n      _timer.cancel();\n    }\n  }\n\n  \/\/\/ \u30bf\u30a4\u30de\u30fc\u7d42\u4e86\u3092\u30ed\u30fc\u30ab\u30eb\u901a\u77e5\n  int _scheduleLocalNotification(Duration duration) {\n    print(&#039;notification scheduled.&#039;);\n    flutterLocalNotificationsPlugin.initialize(\n      InitializationSettings(android: AndroidInitializationSettings(&#039;app_icon&#039;), iOS: IOSInitializationSettings()), \/\/ app_icon.png\u3092\u914d\u7f6e\n    );\n    int notificationId = DateTime.now().hashCode;\n    flutterLocalNotificationsPlugin.zonedSchedule(\n        notificationId,\n        &#039;Time is over&#039;,\n        &#039;&#039;,\n        tz.TZDateTime.now(tz.local).add(duration),\n        NotificationDetails(\n            android: AndroidNotificationDetails(&#039;your channel id&#039;, &#039;your channel name&#039;, &#039;your channel description&#039;,\n                importance: Importance.max, priority: Priority.high),\n            iOS: IOSNotificationDetails()),\n        uiLocalNotificationDateInterpretation: UILocalNotificationDateInterpretation.absoluteTime);\n    return notificationId;\n  }\n\n  @override\n  Widget build(BuildContext context) {\n    return Scaffold(\n        body: Column(mainAxisAlignment: MainAxisAlignment.center, children: [\n      Text(\n        DateFormat.Hms().format(_time),\n        style: Theme.of(context).textTheme.headline2,\n      ),\n      Row(\n        mainAxisAlignment: MainAxisAlignment.center,\n        children: [\n          FloatingActionButton(\n            onPressed: () {\n              if (_timer != null &amp;&amp; _timer.isActive) _timer.cancel();\n            },\n            child: Text(&quot;Stop&quot;),\n          ),\n          FloatingActionButton(\n            onPressed: _startTimer,\n            child: Text(&quot;Start&quot;),\n          ),\n        ],\n      )\n    ]));\n  }\n}<\/code><\/pre>\n<p>\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30a4\u30d9\u30f3\u30c8\u306e<code>paused<\/code>\u3068<code>resumed<\/code>\u306b\u300c\u5bfe\u5fdc\u65b9\u91dd\u300d\u3067\u66f8\u3044\u305f\u5185\u5bb9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u3060\u3051\u306a\u306e\u3067\u3001\u8aac\u660e\u306f\u5272\u611b\u3057\u307e\u3059\u3002\u30b3\u30e1\u30f3\u30c8\u3092\u591a\u3081\u306b\u66f8\u3044\u3066\u308b\u306e\u3067\u3001 \u8208\u5473\u304c\u3042\u308b\u65b9\u306f\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n\u624b\u5143\u3067\u52d5\u304b\u3057\u3066\u307f\u305f\u3044\u65b9\u306f\u3001\u5b9f\u969b\u52d5\u304b\u3057\u305f <a href=\"https:\/\/github.com\/rinoguchi\/study_timer\/blob\/master\/lib\/samples\/lifeCycleEvent.dart\">\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9<\/a> \u3082\u516c\u958b\u3057\u3066\u307e\u3059\u3002<\/p>\n<h2>\u59a5\u5354\u3057\u305f\u30dd\u30a4\u30f3\u30c8<\/h2>\n<p>\u3053\u3061\u3089\u3001\u4e00\u898b\u5b8c\u74a7\u306b\u898b\u3048\u308b\u306e\u3067\u3059\u304c\u3001\u30bf\u30a4\u30de\u30fc\u30a2\u30d7\u30ea\u306a\u306e\u3067\u3001\u672c\u5f53\u306f\u30ed\u30fc\u30ab\u30eb\u901a\u77e5\u3067\u306f\u306a\u304f\u30a2\u30e9\u30fc\u30e0\uff08\u9cf4\u308a\u7d9a\u3051\u308b\uff09\u3068\u3057\u3066\u5b9f\u884c\u3057\u305f\u304b\u3063\u305f\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u30a2\u30e9\u30fc\u30e0\u3092\u9cf4\u3089\u3059\u305f\u3081\u306e <a href=\"https:\/\/pub.dev\/packages\/flutter_ringtone_player\">Flutter Ringtone Player<\/a>  \u306f\u3001\u305d\u306e\u77ac\u9593\u306b\u7740\u4fe1\u97f3\u3092\u9cf4\u3089\u3059\u30d7\u30e9\u30b0\u30a4\u30f3\u3067\u3001\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u767b\u9332\u306f\u3067\u304d\u305a\u3001\u4ed6\u306b\u30a2\u30e9\u30fc\u30e0\u3092\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u767b\u9332\u3067\u304d\u308b\u3088\u3046\u306a\u30d7\u30e9\u30b0\u30a4\u30f3\u3082\u898b\u5f53\u305f\u3089\u306a\u3044\u306e\u3067\u4eca\u56de\u306f\u8ae6\u3081\u307e\u3057\u305f\u3002<\/p>\n<h2>\u3055\u3044\u3054\u306b<\/h2>\n<p>\u4eca\u56de\u3001\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u3066\u3082\u3061\u3083\u3093\u3068\u6642\u9593\u3092\u9032\u3081\u3066\u3001\u6642\u9593\u304c\u6765\u305f\u3089\u901a\u77e5\u3057\u3066\u304f\u308c\u308b\u30bf\u30a4\u30de\u30fc\u30a2\u30d7\u30ea\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u305f\u3002<br \/>\n\u5c11\u3057\u59a5\u5354\u3057\u305f\u70b9\u306f\u3042\u308b\u3082\u306e\u306e\u3001Flutter\u304a\u3088\u3073\u30d7\u30e9\u30b0\u30a4\u30f3\u304c\u63d0\u4f9b\u3057\u3066\u304f\u308c\u3066\u3044\u308b\u7bc4\u56f2\u5185\u3067\u3001\u30b7\u30f3\u30d7\u30eb\u306b\u5b9f\u73fe\u3067\u304d\u305f\u306e\u304c\u3088\u304b\u3063\u305f\u3067\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u5b50\u4f9b\u304cYoutube\u3084\u30a2\u30de\u30be\u30f3\u30d7\u30e9\u30a4\u30e0\u3092\u898b\u308b\u7aef\u672b\u304ciPad\u306a\u306e\u3067\u3059\u304c\u3001App Store\u306b\u767b\u9332\u3059\u308b\u306e\u306f\u6bce\u5e741\u4e07\u5186\u3050\u3089\u3044\u304b\u304b\u308b\u3089\u3057\u3044\u306e\u3067\u304a\u91d1\u3092\u6255\u3046\u6c17\u304c\u8d77\u304d\u305a\u3001Android Studio\u304b\u3089\u30ea\u30ea\u30fc\u30b9\u30e2\u30fc\u30c9\u3067\u76f4\u63a5\u5b9f\u6a5f\u306b\u30c7\u30d7\u30ed\u30a4\u3057\u3066\u4f7f\u3063\u3066\u3044\u307e\u3059\u30022,3\u65e5\u3067\u6709\u52b9\u671f\u9650\u304c\u5207\u308c\u308b\u306e\u3067\u3001\u3057\u3087\u3063\u3061\u3085\u3046\u30c7\u30d7\u30ed\u30a4\u304c\u5fc5\u8981\u306a\u306e\u304c\u9762\u5012\u3067\u3059\u304c\uff08\u6d99\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5c11\u3057\u524d\u306b\u4f1a\u793e\u306e\u30d6\u30ed\u30b0\u3067\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3092\u66f8\u304d\u307e\u3057\u305f\u3002 Flutter\u3067\u304a\u52c9\u5f37\u6642\u9593\u7ba1\u7406\u7528\u306e\u30bf\u30a4\u30de\u30fc\u30a2\u30d7\u30ea\u3092\u4f5c\u3063\u305f \u3053\u306e\u30a2\u30d7\u30ea\u306b\u306f\u3001\u300c\u30a2\u30d7\u30ea\u304c\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3059\u308b\u3068\u30bf\u30a4\u30de\u30fc\u304c\u505c\u6b62\u3057\u3066\u3057\u307e\u3046\u300d\u3068\u3044\u3046\u81f4\u547d\u7684\u306a\u554f\u984c\u304c\u3042\u308a\u307e\u3057\u305f\u304c\u3001\u305d\u306e\u5bfe\u51e6\u65b9\u6cd5\u304c\u5206\u304b\u3063\u305f\u306e\u3067\u3001\u7d39\u4ecb\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002 \u554f\u984c\u70b9 \u30a2\u30d7\u30ea\u304c\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3059\u308b\u3068\u3001\u30a2\u30d7\u30ea\u304c\u4e00\u6642\u505c\u6b62\u3057\u3066\u3057\u307e\u3044\u3001\u30bf\u30a4\u30de\u30fc\u304c\u6b62\u307e\u3063\u3066\u3057\u307e\u3046\u3002 \u5bfe\u5fdc\u65b9\u91dd \u30a2\u30d7\u30ea\u304c\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3068\u3001\u30d5\u30a9\u30a2\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u5fa9\u5e30\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u4ee5\u4e0b\u306e\u51e6\u7406\u3092\u884c\u3046\u4f5c\u6226\u3067\u3044\u3053\u3046\u3068\u601d\u3044\u307e\u3059\u3002 \u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30c9\u306b\u9077\u79fb\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0 \u305d\u306e\u6642\u70b9\u306e\u6642\u9593\u3092\u5143\u306b\u3001\u30ed\u30fc\u30ab\u30eb\u901a\u77e5\u3092\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u767b\u9332\u3059\u308b\uff08\u30ed\u30fc\u30ab\u30eb\u901a\u77e5\u306f\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u3067\u3082\u6642\u9593\u304c\u304f\u308c\u3070\u5b9f\u884c\u3055\u308c\u308b\uff09 \u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u9077\u79fb\u3057\u305f\u65e5\u6642\u3092\u8a18\u9332\u3059\u308b \u30d5\u30a9\u30a2\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u5fa9\u5e30\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0 \u30ed\u30fc\u30ab\u30eb\u901a\u77e5\u30bf\u30a4\u30de\u30fc\u3092\u505c\u6b62\u3059\u308b \u30d5\u30a9\u30a2\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u5fa9\u5e30 <a href=\"http:\/\/localhost:8000\/2021\/04\/flutter-background-timer-app.html\" class=\"read-more button-fancy -red\"><span class=\"btn-arrow\"><\/span><span class=\"twp-read-more text\">Continue Reading<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[38],"tags":[],"_links":{"self":[{"href":"http:\/\/localhost:8000\/wp-json\/wp\/v2\/posts\/605"}],"collection":[{"href":"http:\/\/localhost:8000\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/localhost:8000\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/localhost:8000\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/localhost:8000\/wp-json\/wp\/v2\/comments?post=605"}],"version-history":[{"count":1,"href":"http:\/\/localhost:8000\/wp-json\/wp\/v2\/posts\/605\/revisions"}],"predecessor-version":[{"id":607,"href":"http:\/\/localhost:8000\/wp-json\/wp\/v2\/posts\/605\/revisions\/607"}],"wp:attachment":[{"href":"http:\/\/localhost:8000\/wp-json\/wp\/v2\/media?parent=605"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/localhost:8000\/wp-json\/wp\/v2\/categories?post=605"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/localhost:8000\/wp-json\/wp\/v2\/tags?post=605"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}