WillPopScope在我的android后退按钮设备上不起作用，但在后退的箭头上会起作用。有人知道如何解决这个问题吗？
class DetailScreen extends StatelessWidget {
final Property property;
const DetailScreen(this.property);
return WillPopScope(
onWillPop: () {
_goToProjects(context);
},
child: ScopedModelDescendant<PropertyScopedModel>(
builder: (context, child, model) => Scaffold(
backgroundColor: Color(0xff253138),
body: CustomScrollView(
slivers: <Widget>[
SliverAppBar(
leading: IconButton(icon: Icon(Icons.arrow_back), onPressed: () {_goToProjects(context);} ),
pinned: true,
floating: false,
title: Text('Project titel')),
SliverList(
delegate: SliverChildListDelegate([
Container(
color: Color(0xff2f3e47),
padding: const EdgeInsets.all(16),
margin: const EdgeInsets.symmetric(vertical: 2.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Row(
children: <Widget>[
Expanded(
child: Text(
"INTERN",
overflow: TextOverflow.ellipsis,
style: TextStyle(
color: Colors.green,
fontWeight: FontWeight.bold),
),
),
Chip(
backgroundColor: Colors.green.shade800,
labelStyle: TextStyle(color: Colors.white),
label: Text('In planning'),
)
],
),
SizedBox(
height: 10,
),
Text(
"Project titel",
style: TextStyle(
color: Colors.white, fontWeight: FontWeight.bold),
),
SizedBox(
height: 10,
),
Text(
property.summary,
style: Theme.of(context).textTheme.body2,
),
],
),
),
Container(
color: Color(0xff2f3e47),
margin: const EdgeInsets.symmetric(vertical: 2.0),
padding: const EdgeInsets.all(8),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Align(
alignment: Alignment.center,
child: Container(
child: Text("",
style: TextStyle(
color: Colors.blue, fontSize: 16))),
),
ListTile(
leading: Icon(Icons.pin_drop, color: Colors.white),
title: Text("",
style: TextStyle(fontSize: 14)),
subtitle: Text("",
style: TextStyle(fontSize: 14)),
onTap: () {
_launchMaps();
},
),
ListTile(
leading: Icon(Icons.local_phone, color: Colors.white),
title: Text('',
style:
TextStyle(color: Colors.blue, fontSize: 14)),
onTap: () => launch(""),
),
ListTile(
leading: Icon(Icons.mail, color: Colors.white),
title: Text('',
style: TextStyle(fontSize: 14)),
onTap: () {
_launchMail();
},
),
ListTile(
leading: Icon(Icons.web, color: Colors.white),
title: Text(
'',
style: TextStyle(color: Colors.blue, fontSize: 14),
),
onTap: () {
_launchURL();
},
),
],
),
),
Container(
margin: const EdgeInsets.symmetric(vertical: 2.0),
),
Container(
color: Color(0xff2f3e47),
margin: const EdgeInsets.symmetric(vertical: 0.0),
padding: const EdgeInsets.all(12),
child: Row(
children: <Widget>[
Text(
"Taken",
style: Theme.of(context)
.textTheme
.title
.copyWith(fontSize: 20.0),
),
],
),
),
InkWell(
onTap: () {
print('test');
},
child: Container(
color: Color(0xff2f3e47),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: const EdgeInsets.all(12.0),
child: Column(
mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Divider(height: 3, color: Color(0xff253138),),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text('', style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold), ),
Text('12-02-2019'),
],
),
SizedBox(
height: 10,
),
Row(
children: <Widget>[
Expanded(
child: Text(
property.summary,
style: Theme.of(context)
.textTheme
.body2,
),
),
Chip(
backgroundColor:
Colors.green.shade800,
label: Text('In planning'),
)
],
),
Divider(height: 3, color: Colors.red,),
],
),
),
),
],
),
),
),
Container(
margin: const EdgeInsets.symmetric(vertical: 2.0),
),
Container(
color: Color(0xff2f3e47),
margin: const EdgeInsets.symmetric(vertical: 2.0),
padding: const EdgeInsets.all(8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(bottom: 8.0),
child: Text(
"Lister",
style: Theme.of(context)
.textTheme
.title
.copyWith(fontSize: 20.0),
),
),
ListTile(
leading: Icon(Icons.account_circle),
title:
Text("${property?.listerName ?? "unavailable"}"),
subtitle: Text(
"${property?.datasourceName ?? "source unavailable"}"),
),
],
),
),
]))
],
),
floatingActionButton: AnimatedFloatingActionButton(
//Fab list
fabButtons: <Widget>[float1(), float2(), float3()],
colorStartAnimation: Color(0xff0f70b7),
colorEndAnimation: Colors.red,
animatedIconData: AnimatedIcons.menu_close //To principal button
),
),
),
);
}
}
他应该对此做出反应
void _goToProjects(context) {
print('test');
Navigator.push(context, MaterialPageRoute(builder: (context) {
return GetProjects();
}));
}
尝试了许多不同的方法，但是没有任何效果。我希望有人对如何解决此问题有所了解，并且知道我在做什么错。
预先感谢
答案 0 :(得分：1)
WillPopScope是一个StatefulWidget小部件。因此，将您的DetailScreen类转换为StatefulWidget类。
只要有property.summary，请将其更改为widget.property.summary并尝试 在您的项目中更改此代码：
class DetailScreen extends StatefulWidget {
final Property property;
DetailScreen({Key key, this.property}) : super(key: key);
@override
DetailScreenState createState() {
return DetailScreenState();
}
}
class DetailScreenState extends State<DetailScreen> {
Future<bool> _goToProjects() {
print('test');
return Navigator.push(
context, MaterialPageRoute(builder: (context) => GetProjects()));
}
return WillPopScope(
onWillPop: _goToProjects,
child: ScopedModelDescendant<PropertyScopedModel>(
...
Text(
"Project titel",
style: TextStyle(
color: Colors.white, fontWeight: FontWeight.bold),
),
SizedBox(
height: 10,
),
Text(
widget.property.summary,
style: Theme.of(context).textTheme.body2,
),
... code
Row(
children: <Widget>[
Expanded(
child: Text(
widget.property.summary,
style: Theme.of(context)
.textTheme
.body2,
),
),
Chip(
backgroundColor:
Colors.green.shade800,
label: Text('In planning'),
)
],
),
..rest of your code
),
);
}