Flutter Gridview未在景观中填充主体
我使用的是在横向和纵向模式下都需要响应的视图,当我切换到横向模式时,我使用的是gridview,但是在横向模式下,gridview不能填充整个身体 Gridview似乎没有默认的填充或其他内容Flutter Gridview未在景观中填充主体,flutter,flutter-layout,Flutter,Flutter Layout,我使用的是在横向和纵向模式下都需要响应的视图,当我切换到横向模式时,我使用的是gridview,但是在横向模式下,gridview不能填充整个身体 Gridview似乎没有默认的填充或其他内容 导入“包装:颤振/材料.省道”; 导入“包:flifter/services.dart”; void main()异步{ SystemChrome.setPreferredOrientations([ DeviceOrientation.Up, DeviceOrientation.landscapeL
导入“包装:颤振/材料.省道”;
导入“包:flifter/services.dart”;
void main()异步{
SystemChrome.setPreferredOrientations([
DeviceOrientation.Up,
DeviceOrientation.landscapeLeft,
设备定向。景观权
]);
runApp(
MyApp(),
);
}
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
),
主页:MyHomePage(标题:“颤振演示主页”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
双高;
final key=GlobalKey();
@凌驾
initState(){
//在呈现布局后调用getHeight函数
WidgetsBinding.instance.addPostFrameCallback((\u)=>getHeight());
super.initState();
}
getHeight(){
final RenderBox renderBoxRed=key.currentContext.findRenderObject();
最终尺寸=renderBoxRed.size.height;
打印(“容器尺寸:$SIZE”);
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(widget.title),
),
正文:布局生成器(
生成器:(BuildContext上下文,BoxConstraints){
高度=约束。最大高度;
return(MediaQuery.of(context).size.width>=600&&
MediaQuery.of(context.orientation==orientation.scape)
?GridView.count(
交叉轴计数:2,
收缩膜:对,
儿童:[
容器(
高度:高度,,
颜色:颜色,黑色,
),
容器(
钥匙:钥匙,
高度:高度,,
颜色:颜色,红色,
child:buildChildren(),
)
],
)
:列(
儿童:[
容器(
高度:高度/2,
颜色:颜色,黑色,
),
容器(
钥匙:钥匙,
高度:高度/2,
颜色:颜色,红色,
child:buildChildren(),
)
],
);
},
),
背景颜色:Colors.yellow,
);
}
建筑儿童(){
返回列(
mainAxisAlignment:mainAxisAlignment.center,
儿童:[
居中(
子:文本(
“车身高度:”+高度.toString(),
样式:TextStyle(颜色:Colors.white,字体大小:30),
),
),
居中(
子项:MediaQuery.of(context.orientation==orientation.scape?文本(
“容器高度:”+640.0.toString(),
样式:TextStyle(颜色:Colors.white,字体大小:30),
):文本(
“容器高度:”+576.0.toString(),
样式:TextStyle(颜色:Colors.white,字体大小:30),
),
),
居中(
子:文本(
“设备高度:”+MediaQuery.of(context).size.height.toString(),
样式:TextStyle(颜色:Colors.white,字体大小:30),
),
),
],
);
}
}
这是重现此问题所需的最少代码。预期输出是黑色容器占据整个可用屏幕空间,因此脚手架背景色都不可见。感谢您的帮助
我的目标是在nexus 10 emu上测试的所有平板电脑上获得一张图像,以填充整个黑色容器,该容器应以横向模式填充整个身体
emulator速度很慢,我必须按下按钮让emulator知道我更改为横向
编辑我已经编辑了我的完整代码,在图像部分,您需要
FittedBox(
child: Image.asset(
'assets/images/bg.jpg',
),
fit: BoxFit.fill,
))
完整代码
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() async {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.landscapeLeft,
DeviceOrientation.landscapeRight
]);
runApp(
MyApp(),
);
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
double height;
double width;
final key = GlobalKey();
@override
initState() {
//calling the getHeight Function after the Layout is Rendered
WidgetsBinding.instance.addPostFrameCallback((_) => getHeight());
super.initState();
}
getHeight() {
final RenderBox renderBoxRed = key.currentContext.findRenderObject();
final size = renderBoxRed.size.height;
print("SIZE of container: $size");
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
height = constraints.maxHeight;
width = constraints.maxWidth;
return (MediaQuery.of(context).size.width >= 600 &&
MediaQuery.of(context).orientation == Orientation.landscape)
? GridView.count(
crossAxisCount: 2,
shrinkWrap: true,
children: [
Container(
height: height,
width: width / 2,
color: Colors.black,
child: FittedBox(
child: Image.asset(
'assets/images/bg.jpg',
),
fit: BoxFit.fill,
)),
Container(
key: key,
height: height,
color: Colors.red,
child: buildChildren(),
)
],
)
: Column(
children: <Widget>[
Container(
height: height / 2,
width: width ,
color: Colors.black,
child: FittedBox(
child: Image.asset(
'assets/images/bg.jpg',
),
fit: BoxFit.fill,
)),
Container(
key: key,
height: height / 2,
width: width ,
color: Colors.red,
child: buildChildren(),
)
],
);
},
),
backgroundColor: Colors.yellow,
);
}
buildChildren() {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Center(
child: Text(
"Body height: " + height.toString(),
style: TextStyle(color: Colors.white, fontSize: 30),
),
),
Center(
child: MediaQuery.of(context).orientation == Orientation.landscape
? Text(
"Container height: " + 640.0.toString(),
style: TextStyle(color: Colors.white, fontSize: 30),
)
: Text(
"Container height: " + 576.0.toString(),
style: TextStyle(color: Colors.white, fontSize: 30),
),
),
Center(
child: Text(
"Device height: " + MediaQuery.of(context).size.height.toString(),
style: TextStyle(color: Colors.white, fontSize: 30),
),
),
],
);
}
}
导入“包装:颤振/材料.省道”;
导入“包:flifter/services.dart”;
void main()异步{
SystemChrome.setPreferredOrientations([
DeviceOrientation.Up,
DeviceOrientation.landscapeLeft,
设备定向。景观权
]);
runApp(
MyApp(),
);
}
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
),
主页:MyHomePage(标题:“颤振演示主页”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
双高;
双倍宽度;
final key=GlobalKey();
@凌驾
initState(){
//在呈现布局后调用getHeight函数
WidgetsBinding.instance.addPostFrameCallback((\u)=>getHeight());
super.initState();
}
getHeight(){
final RenderBox renderBoxRed=key.currentContext.findRenderObject();
最终尺寸=renderBoxRed.size.height;
打印(“容器尺寸:$SIZE”);
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(widget.title),
),
正文:布局生成器(
生成器:(BuildContext上下文,BoxCons)
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() async {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.landscapeLeft,
DeviceOrientation.landscapeRight
]);
runApp(
MyApp(),
);
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
double height;
double width;
final key = GlobalKey();
@override
initState() {
//calling the getHeight Function after the Layout is Rendered
WidgetsBinding.instance.addPostFrameCallback((_) => getHeight());
super.initState();
}
getHeight() {
final RenderBox renderBoxRed = key.currentContext.findRenderObject();
final size = renderBoxRed.size.height;
print("SIZE of container: $size");
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
height = constraints.maxHeight;
width = constraints.maxWidth;
return (MediaQuery.of(context).size.width >= 600 &&
MediaQuery.of(context).orientation == Orientation.landscape)
? GridView.count(
crossAxisCount: 2,
shrinkWrap: true,
children: [
Container(
height: height,
width: width / 2,
color: Colors.black,
child: FittedBox(
child: Image.asset(
'assets/images/bg.jpg',
),
fit: BoxFit.fill,
)),
Container(
key: key,
height: height,
color: Colors.red,
child: buildChildren(),
)
],
)
: Column(
children: <Widget>[
Container(
height: height / 2,
width: width ,
color: Colors.black,
child: FittedBox(
child: Image.asset(
'assets/images/bg.jpg',
),
fit: BoxFit.fill,
)),
Container(
key: key,
height: height / 2,
width: width ,
color: Colors.red,
child: buildChildren(),
)
],
);
},
),
backgroundColor: Colors.yellow,
);
}
buildChildren() {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Center(
child: Text(
"Body height: " + height.toString(),
style: TextStyle(color: Colors.white, fontSize: 30),
),
),
Center(
child: MediaQuery.of(context).orientation == Orientation.landscape
? Text(
"Container height: " + 640.0.toString(),
style: TextStyle(color: Colors.white, fontSize: 30),
)
: Text(
"Container height: " + 576.0.toString(),
style: TextStyle(color: Colors.white, fontSize: 30),
),
),
Center(
child: Text(
"Device height: " + MediaQuery.of(context).size.height.toString(),
style: TextStyle(color: Colors.white, fontSize: 30),
),
),
],
);
}
}