blob: ab3bda2b40af1f9f1887b690e9d07a1640d976e8 [file] [log] [blame]
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/widgets.dart';
class LifecycleWatcher extends StatefulWidget {
const LifecycleWatcher({ Key key }) : super(key: key);
@override
_LifecycleWatcherState createState() => _LifecycleWatcherState();
}
class _LifecycleWatcherState extends State<LifecycleWatcher>
with WidgetsBindingObserver {
AppLifecycleState _lastLifecycleState;
@override
void initState() {
super.initState();
WidgetsBinding.instance.addObserver(this);
}
@override
void dispose() {
WidgetsBinding.instance.removeObserver(this);
super.dispose();
}
@override
void didChangeAppLifecycleState(AppLifecycleState state) {
setState(() {
_lastLifecycleState = state;
});
}
@override
Widget build(BuildContext context) {
if (_lastLifecycleState == null)
return const Text('This widget has not observed any lifecycle changes.');
return Text('The most recent lifecycle state this widget observed was: $_lastLifecycleState.');
}
}
void main() {
runApp(
const Directionality(
textDirection: TextDirection.ltr,
child: Center(
child: LifecycleWatcher(),
),
),
);
}