我想将我的应用程序中仅一页的方向更改为横向以查看较大的图片
我只能找到用于设置整个应用方向的代码。我不知道如何在现有代码中实现此（Flutter: How to set and lock screen orientation on-demand）代码
// ======== CAROUSEL =========
return Scaffold(
appBar: AppBar(
backgroundColor: new Color(0xFFFA983A),
title: Image.asset(
'assets/images/logo_white.png',
fit: BoxFit.cover,
),
elevation: 0.0,
centerTitle: true,
actions: <Widget>[
new IconButton(
icon: new Icon(Icons.search),
onPressed: () {
Navigator.push(context,
MaterialPageRoute(builder: (context) => new SearchPage()));
},
),
],
),
body: Column(
children: <Widget>[
Container(
alignment: Alignment.topCenter,
height: 200,
child: GestureDetector(
child: Hero(
tag: 'carouselHero',
child: SizedBox.expand(
child: Stack(
children: <Widget>[
imageSlider,
banner,
],
),
),
),
onDoubleTap: () {
Navigator.push(context, MaterialPageRoute(builder: (_) {
return ImageScreen();
}));
},
),
),
SizedBox(height: 4),
Expanded(
child: Container(
padding: EdgeInsets.only(left: 12.0, top: 4.0, right: 12.0),
child: SingleChildScrollView(
child: Container(
height: MediaQuery.of(context).size.height,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
widget.propertyDetailTown,
style: TextStyle(
color: Color(0xFFFA983A),
fontSize: 20.0,
fontWeight: FontWeight.bold),
),
Text(
"Ref: RBD02548649",
style: TextStyle(
color: Colors.grey,
fontSize: 14.0,
fontWeight: FontWeight.normal),
),
],
),
SizedBox(
height: 4,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
widget.propertyDetailArea,
style: TextStyle(
fontSize: 20.0, fontWeight: FontWeight.bold),
),
Text(
widget.propertyDetailPrice,
style: TextStyle(
fontSize: 20.0,
fontWeight: FontWeight.normal,
color: Color(0xFFFA983A)),
),
],
),
SizedBox(
height: 8,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Row(
children: <Widget>[
Image.asset(
'assets/images/icons/beds_new.png',
scale: 1.75,
),
Text(" 4"),
SizedBox(
width: 8,
),
Image.asset(
'assets/images/icons/bath_new.png',
scale: 1.75,
),
Text(
" 3",
),
SizedBox(
width: 8,
),
Image.asset(
'assets/images/icons/parking_new.png',
scale: 1.75,
),
Text(" 2"),
],
),
Text(
"1200 sqr ft.",
style: TextStyle(color: Colors.grey),
)
],
),
SizedBox(
height: 4,
),
Divider(
height: 10,
),
SizedBox(
height: 4,
),
// PROPERTY DESCRIPTION ==============================
Text(
'Description',
style: TextStyle(
color: Colors.black.withOpacity(0.8),
fontSize: 18.0,
fontWeight: FontWeight.bold),
),
Text(
"Lorem Ipsum is simply dummy text of the printing and typesetting "
"industry. Lorem Ipsum has been the industry's standard dummy "
"text ever since the 1500s, when an unknown printer took a "
"galley of type and scrambled it to make a type specimen book. "
"It has survived not only five centuries, but also the leap "
"into electronic typesetting, remaining essentially unchanged.",
style: TextStyle(
color: Colors.black.withOpacity(0.6),
fontSize: 16.0,
fontWeight: FontWeight.normal),
),
SizedBox(height: 8),
Divider(height: 10),
Text(
"AMENITIES",
style: TextStyle(
color: Colors.black.withOpacity(0.8),
fontSize: 18.0,
fontWeight: FontWeight.bold),
),
SizedBox(height: 8.0),
// AMENITIES STARTS HERE ===============================
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(
Icons.hotel,
color: Color(0xFFFA983A),
),
Text(
" One",
style: TextStyle(fontSize: 16),
),
SizedBox(width: 100.0),
Icon(
Icons.room,
color: Color(0xFFFA983A),
),
Text(" Two")
],
),
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(
Icons.hotel,
color: Color(0xFFFA983A),
),
Text(
" One",
style: TextStyle(fontSize: 16),
),
SizedBox(width: 100.0),
Icon(
Icons.room,
color: Color(0xFFFA983A),
),
Text(" Two")
],
),
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(
Icons.hotel,
color: Color(0xFFFA983A),
),
Text(
" One",
style: TextStyle(fontSize: 16),
),
SizedBox(width: 100.0),
Icon(
Icons.room,
color: Color(0xFFFA983A),
),
Text(" Two")
],
),
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(
Icons.hotel,
color: Color(0xFFFA983A),
),
Text(
" One",
style: TextStyle(fontSize: 16),
),
SizedBox(width: 100.0),
Icon(
Icons.room,
color: Color(0xFFFA983A),
),
Text(" Two")
],
),
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(
Icons.hotel,
color: Color(0xFFFA983A),
),
Text(
" One",
style: TextStyle(fontSize: 16),
),
SizedBox(width: 100.0),
Icon(
Icons.room,
color: Color(0xFFFA983A),
),
Text(" Two")
],
),
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(
Icons.hotel,
color: Color(0xFFFA983A),
),
Text(
" One",
style: TextStyle(fontSize: 16),
),
SizedBox(width: 100.0),
Icon(
Icons.room,
color: Color(0xFFFA983A),
),
Text(" Two")
],
),
SizedBox(
height: 10,
),
Text(
"Home Loan Calculator",
style: TextStyle(
color: Colors.black.withOpacity(0.8),
fontSize: 18.0,
fontWeight: FontWeight.bold),
),
// Image.asset("assets/google_map.jpg"),
],
),
),
),
),
)
],
),
);
}
}
// ===========SECOND PAGE NEEDS TO BE LANDSCAPE ==================
class ImageScreen extends StatelessWidget {
@override
Widget build(BuildContext context) {
Widget imageSlider = Container(
height: MediaQuery.of(context).size.height,
child: Carousel(
boxFit: BoxFit.cover,
images: [
AssetImage('assets/images/houses/house.jpg'),
AssetImage('assets/images/houses/house1.jpg'),
AssetImage('assets/images/houses/house2.jpg'),
AssetImage('assets/images/houses/house3.jpg'),
AssetImage('assets/images/houses/house4.jpg'),
],
autoplay: false,
dotBgColor: Colors.transparent,
dotSize: 0,
),
);
return Scaffold(
body: GestureDetector(
child: Center(
child: Hero(
tag: 'carouselHero',
child: imageSlider,
),
),
onTap: () {
Navigator.pop(context);
},
),
);
}
}```
when i click on a picture it has to go to a new page which automatically change orientation to Landscape ans when i click back to previous page it changes again.
答案 0 :(得分：0)
您正在使用StatelessWidget，因此无法覆盖initState和dispose。首先，将您的StatelessWidget转换为StatefulWidget，然后实施另一个答案提供的代码。
class ImageScreen extends StatefulWidget {
@override
ImageScreenState createState() => ImageScreenState();
}
class ImageScreenState extends State<ImageScreen> {
@override
void initState(){
super.initState();
SystemChrome.setPreferredOrientations([
DeviceOrientation.landscapeRight,
DeviceOrientation.landscapeLeft,
]);
}
@override
dispose(){
SystemChrome.setPreferredOrientations([
DeviceOrientation.landscapeRight,
DeviceOrientation.landscapeLeft,
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
super.dispose();
}
@override
Widget build(BuildContext context) {
Widget imageSlider = Container(
height: MediaQuery.of(context).size.height,
child: Carousel(
boxFit: BoxFit.cover,
images: [
AssetImage('assets/images/houses/house.jpg'),
AssetImage('assets/images/houses/house1.jpg'),
AssetImage('assets/images/houses/house2.jpg'),
AssetImage('assets/images/houses/house3.jpg'),
AssetImage('assets/images/houses/house4.jpg'),
],
autoplay: false,
dotBgColor: Colors.transparent,
dotSize: 0,
),
);
return Scaffold(
body: GestureDetector(
child: Center(
child: Hero(
tag: 'carouselHero',
child: imageSlider,
),
),
onTap: () {
Navigator.pop(context);
},
),
);
}
}