您可以使用它WillPopScope来实现。
例：
import 'dart:async';
import 'package:Flutter/material.dart';
class HomePage extends StatefulWidget {
HomePage({Key key, this.title}) :super(key: key);
final String title;
@override
State<StatefulWidget> createState() => new _HomePageState();
}
class _HomePageState extends State<HomePage> {
Future<bool> _onWillPop() async {
return (await showDialog(
context: context,
builder: (context) => new AlertDialog(
title: new Text('Are you sure?'),
content: new Text('Do you want to exit an App'),
actions: <Widget>[
new FlatButton(
onPressed: () => Navigator.of(context).pop(false),
child: new Text('No'),
),
new FlatButton(
onPressed: () => Navigator.of(context).pop(true),
child: new Text('Yes'),
),
],
),
)) ?? false;
}
@override
Widget build(BuildContext context) {
return new WillPopScope(
onWillPop: _onWillPop,
child: new Scaffold(
appBar: new AppBar(
title: new Text("Home Page"),
),
body: new Center(
child: new Text("Home Page"),
),
),
);
}
}
有关??-operator支票的信息null，请参见此处。这很重要，因为如果您在对话框外单击，showDialog将返回null，在这种情况下将返回false。
希望能有所帮助！
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