Flutter:EasyLoading库找不到MediaQuery小部件错误 [英] Flutter: EasyLoading library No MediaQuery widget found error
本文介绍了Flutter:EasyLoading库找不到MediaQuery小部件错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用EasyLoading库(我的代码:
void main(){runApp(MyApp());configLoading();}MyApp类扩展了StatelessWidget {@override窗口小部件build(BuildContext context){返回FlutterEasyLoading(子代:GestureDetector(onTap:(){FocusScopeNode currentFocus = FocusScope.of(context);如果(！currentFocus.hasPrimaryFocus){currentFocus.unfocus();}}，子:MaterialApp(主页:StartPage()，debugShowCheckedModeBanner:否，)，))；}} 解决方案
您可以在
下复制粘贴运行完整代码摘自官方示例
完整代码
import'dart:async';导入'package:flutter/material.dart';导入'package:flutter/cupertino.dart';导入'package:flutter_easyloading/flutter_easyloading.dart';void main(){runApp(MyApp());configLoading();}无效configLoading(){EasyLoading.instance..displayDuration = const持续时间(毫秒:2000)..indicatorType = EasyLoadingIndicatorType.fadingCircle..loadingStyle = EasyLoadingStyle.dark..indicatorSize = 45.0..radius = 10.0..progressColor =颜色.yellow..backgroundColor =颜色.绿色..indicatorColor =颜色.黄色..textColor =颜色.yellow..maskColor = Colors.blue.withOpacity(0.5)..userInteractions = true;}MyApp类扩展了StatelessWidget {@override窗口小部件build(BuildContext context){返回MaterialApp(标题:"Flutter EasyLoading"，主题:ThemeData(primarySwatch:Colors.blue，)，builder:(BuildContext上下文，Widget子项){返回FlutterEasyLoading(子代:GestureDetector(onTap:(){FocusScopeNode currentFocus = FocusScope.of(context);如果(！currentFocus.hasPrimaryFocus){currentFocus.unfocus();}}，孩子:孩子，))；}，主页:StartPage()，);}}StartPage类扩展了StatefulWidget {StartPage({Key key}):超级(key:key);@override_StartPageState createState()=>_StartPageState();}类_StartPageState扩展了State< StartPage>{计时器_timer;双进度@override无效的initState(){super.initState();///为该帧的结尾安排一个回调WidgetsBinding.instance.addPostFrameCallback((_){EasyLoading.showSuccess('在initState中使用！');});}@override窗口小部件build(BuildContext context){返回脚手架(appBar:AppBar(标题:Text("test")，)，身体:容器(宽度:MediaQuery.of(context).size.width，子级:SingleChildScrollView(子:列(crossAxisAlignment:CrossAxisAlignment.center，mainAxisAlignment:MainAxisAlignment.start，子代:< Widget> [加高按钮(onPressed:(){Navigator.pushReplacement(上下文，MaterialPageRoute(builder:(context)=> ExamplePage()));}，子级:Text("click"))，文本域()，柱子(子代:< Widget> [FlatButton(textColor:Colors.blue，子代:Text('dismiss')，onPressed:(){_timer?.cancel();EasyLoading.dismiss();}，)，FlatButton(textColor:Colors.blue，子代:文字('show')，onPressed:(){_timer?.cancel();EasyLoading.show(状态:'正在加载...');}，)，FlatButton(textColor:Colors.blue，子级:Text('showProgress')，onPressed:(){_progress = 0;_timer?.cancel();_timer = Timer.periodic(const持续时间(毫秒:100)，(计时器计时器){EasyLoading.showProgress(_progress，状态:'$ {(_ progress * 100).toStringAsFixed(0)}％');_progress + = 0.03;如果(_progress> = 1){_timer?.cancel();EasyLoading.dismiss();}});}，)，FlatButton(textColor:Colors.blue，子级:Text('showSuccess')，onPressed:(){_timer?.cancel();EasyLoading.showSuccess('伟大的成功！');}，)，FlatButton(textColor:Colors.blue，子级:Text('showError')，onPressed:(){_timer?.cancel();EasyLoading.showError('失败失败');}，)，FlatButton(textColor:Colors.blue，子级:Text('showInfo')，onPressed:(){_timer?.cancel();EasyLoading.showInfo('有用的信息.');}，)，FlatButton(textColor:Colors.blue，子级:Text('showToast')，onPressed:(){_timer?.cancel();EasyLoading.showToast('Toast');}，)，]，)，填充(填充:EdgeInsets.only(top:20.0)，子:列(子代:< Widget> [文字(样式")，填充(填充:EdgeInsets.only(top:10.0)，子代:CupertinoSegmentedControl< EasyLoadingStyle>(selectedColor:Colors.blue，孩子们: {EasyLoadingStyle.dark:填充(填充:EdgeInsets.all(5.0)，子级:Text("dark")，)，EasyLoadingStyle.light:填充(填充:EdgeInsets.all(5.0)，子级:Text("light")，)，EasyLoadingStyle.custom:填充(填充:EdgeInsets.all(5.0)，子级:Text("custom")，)，}，onValueChanged :(值){EasyLoading.instance.loadingStyle =值;}，)，)，]，)，)，填充(填充:EdgeInsets.only(top:20.0)，子:列(子代:< Widget> [文字('MaskType')，填充(填充:EdgeInsets.only(top:10.0)，子代:CupertinoSegmentedControl< EasyLoadingMaskType>(selectedColor:Colors.blue，孩子们: {EasyLoadingMaskType.none:填充(填充:EdgeInsets.all(5.0)，子级:Text("none")，)，EasyLoadingMaskType.clear:填充(填充:EdgeInsets.all(5.0)，子级:Text("clear")，)，EasyLoadingMaskType.black:填充(填充:EdgeInsets.all(5.0)，子级:Text("black")，)，EasyLoadingMaskType.custom:填充(填充:EdgeInsets.all(5.0)，子级:Text("custom")，)，}，onValueChanged :(值){EasyLoading.instance.maskType =值;}，)，)，]，)，)，填充(填充:EdgeInsets.only(top:20.0)，子:列(子代:< Widget> [Text('IndicatorType(total:23)')，填充(填充:EdgeInsets.only(top:10.0)，孩子:CupertinoSegmentedControl< EasyLoadingIndicatorType>(selectedColor:Colors.blue，孩子们: {EasyLoadingIndicatorType.circle:填充(填充:EdgeInsets.all(5.0)，子代:Text("circle")，)，EasyLoadingIndicatorType.wave:填充(填充:EdgeInsets.all(5.0)，子级:Text("wave")，)，EasyLoadingIndicatorType.ring:填充(填充:EdgeInsets.all(5.0)，子级:Text("ring")，)，EasyLoadingIndicatorType.pulse:填充(填充:EdgeInsets.all(5.0)，子级:Text("pulse")，)，EasyLoadingIndicatorType.cubeGrid:填充(填充:EdgeInsets.all(5.0)，子级:Text("cubeGrid")，)，EasyLoadingIndicatorType.threeBounce:填充(填充:EdgeInsets.all(5.0)，子级:Text("threeBounce")，)，}，onValueChanged :(值){EasyLoading.instance.indicatorType =值；}，)，)，]，)，)，]，)，)，)，);}}类ExamplePage扩展了StatefulWidget {@override_ExamplePageState createState()=>_ExamplePageState();}类_ExamplePageState扩展了State< ExamplePage>{@override窗口小部件build(BuildContext context){返回脚手架(appBar:AppBar(标题:文本(示例")，)，身体:容器(子级:文本(示例页面")，))；}} I use EasyLoading library(https://pub.dev/packages/flutter_easyloading). Everything works fine. But when I double click TextFormField this error occurs. I tried to make MaterialApp as root widget and put EasyLoading as child but this time EasyLoading not working. My code:
void main() {
runApp(MyApp());
configLoading();
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return FlutterEasyLoading(
child: GestureDetector(
onTap: () {
FocusScopeNode currentFocus = FocusScope.of(context);
if (!currentFocus.hasPrimaryFocus) {
currentFocus.unfocus();
}
},
child: MaterialApp(
home: StartPage(),
debugShowCheckedModeBanner: false,
),
));
}
}
解决方案
You can copy paste run full code below
From official example https://github.com/huangjianke/flutter_easyloading#how-to-use
You can put FlutterEasyLoading in builder of MaterialApp
code snippet
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter EasyLoading',
theme: ThemeData(
primarySwatch: Colors.blue,
),
builder: (BuildContext context, Widget child) {
return FlutterEasyLoading(
child: GestureDetector(
onTap: () {
FocusScopeNode currentFocus = FocusScope.of(context);
if (!currentFocus.hasPrimaryFocus) {
currentFocus.unfocus();
}
},
child: child,
));
},
home: StartPage(),
);
}
}
working demo
full code
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter_easyloading/flutter_easyloading.dart';
void main() {
runApp(MyApp());
configLoading();
}
void configLoading() {
EasyLoading.instance
..displayDuration = const Duration(milliseconds: 2000)
..indicatorType = EasyLoadingIndicatorType.fadingCircle
..loadingStyle = EasyLoadingStyle.dark
..indicatorSize = 45.0
..radius = 10.0
..progressColor = Colors.yellow
..backgroundColor = Colors.green
..indicatorColor = Colors.yellow
..textColor = Colors.yellow
..maskColor = Colors.blue.withOpacity(0.5)
..userInteractions = true;
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter EasyLoading',
theme: ThemeData(
primarySwatch: Colors.blue,
),
builder: (BuildContext context, Widget child) {
return FlutterEasyLoading(
child: GestureDetector(
onTap: () {
FocusScopeNode currentFocus = FocusScope.of(context);
if (!currentFocus.hasPrimaryFocus) {
currentFocus.unfocus();
}
},
child: child,
));
},
home: StartPage(),
);
}
}
class StartPage extends StatefulWidget {
StartPage({Key key}) : super(key: key);
@override
_StartPageState createState() => _StartPageState();
}
class _StartPageState extends State<StartPage> {
Timer _timer;
double _progress;
@override
void initState() {
super.initState();
/// Schedule a callback for the end of this frame
WidgetsBinding.instance.addPostFrameCallback((_) {
EasyLoading.showSuccess('Use in initState!');
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("test"),
),
body: Container(
width: MediaQuery.of(context).size.width,
child: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
RaisedButton(
onPressed: () {
Navigator.pushReplacement(context,
MaterialPageRoute(builder: (context) => ExamplePage()));
},
child: Text("click")),
TextField(),
Column(
children: <Widget>[
FlatButton(
textColor: Colors.blue,
child: Text('dismiss'),
onPressed: () {
_timer?.cancel();
EasyLoading.dismiss();
},
),
FlatButton(
textColor: Colors.blue,
child: Text('show'),
onPressed: () {
_timer?.cancel();
EasyLoading.show(status: 'loading...');
},
),
FlatButton(
textColor: Colors.blue,
child: Text('showProgress'),
onPressed: () {
_progress = 0;
_timer?.cancel();
_timer = Timer.periodic(const Duration(milliseconds: 100),
(Timer timer) {
EasyLoading.showProgress(_progress,
status: '${(_progress * 100).toStringAsFixed(0)}%');
_progress += 0.03;
if (_progress >= 1) {
_timer?.cancel();
EasyLoading.dismiss();
}
});
},
),
FlatButton(
textColor: Colors.blue,
child: Text('showSuccess'),
onPressed: () {
_timer?.cancel();
EasyLoading.showSuccess('Great Success!');
},
),
FlatButton(
textColor: Colors.blue,
child: Text('showError'),
onPressed: () {
_timer?.cancel();
EasyLoading.showError('Failed with Error');
},
),
FlatButton(
textColor: Colors.blue,
child: Text('showInfo'),
onPressed: () {
_timer?.cancel();
EasyLoading.showInfo('Useful Information.');
},
),
FlatButton(
textColor: Colors.blue,
child: Text('showToast'),
onPressed: () {
_timer?.cancel();
EasyLoading.showToast('Toast');
},
),
],
),
Padding(
padding: EdgeInsets.only(top: 20.0),
child: Column(
children: <Widget>[
Text('Style'),
Padding(
padding: EdgeInsets.only(top: 10.0),
child: CupertinoSegmentedControl<EasyLoadingStyle>(
selectedColor: Colors.blue,
children: {
EasyLoadingStyle.dark: Padding(
padding: EdgeInsets.all(5.0),
child: Text("dark"),
),
EasyLoadingStyle.light: Padding(
padding: EdgeInsets.all(5.0),
child: Text("light"),
),
EasyLoadingStyle.custom: Padding(
padding: EdgeInsets.all(5.0),
child: Text("custom"),
),
},
onValueChanged: (value) {
EasyLoading.instance.loadingStyle = value;
},
),
),
],
),
),
Padding(
padding: EdgeInsets.only(top: 20.0),
child: Column(
children: <Widget>[
Text('MaskType'),
Padding(
padding: EdgeInsets.only(top: 10.0),
child: CupertinoSegmentedControl<EasyLoadingMaskType>(
selectedColor: Colors.blue,
children: {
EasyLoadingMaskType.none: Padding(
padding: EdgeInsets.all(5.0),
child: Text("none"),
),
EasyLoadingMaskType.clear: Padding(
padding: EdgeInsets.all(5.0),
child: Text("clear"),
),
EasyLoadingMaskType.black: Padding(
padding: EdgeInsets.all(5.0),
child: Text("black"),
),
EasyLoadingMaskType.custom: Padding(
padding: EdgeInsets.all(5.0),
child: Text("custom"),
),
},
onValueChanged: (value) {
EasyLoading.instance.maskType = value;
},
),
),
],
),
),
Padding(
padding: EdgeInsets.only(top: 20.0),
child: Column(
children: <Widget>[
Text('IndicatorType(total: 23)'),
Padding(
padding: EdgeInsets.only(top: 10.0),
child:
CupertinoSegmentedControl<EasyLoadingIndicatorType>(
selectedColor: Colors.blue,
children: {
EasyLoadingIndicatorType.circle: Padding(
padding: EdgeInsets.all(5.0),
child: Text("circle"),
),
EasyLoadingIndicatorType.wave: Padding(
padding: EdgeInsets.all(5.0),
child: Text("wave"),
),
EasyLoadingIndicatorType.ring: Padding(
padding: EdgeInsets.all(5.0),
child: Text("ring"),
),
EasyLoadingIndicatorType.pulse: Padding(
padding: EdgeInsets.all(5.0),
child: Text("pulse"),
),
EasyLoadingIndicatorType.cubeGrid: Padding(
padding: EdgeInsets.all(5.0),
child: Text("cubeGrid"),
),
EasyLoadingIndicatorType.threeBounce: Padding(
padding: EdgeInsets.all(5.0),
child: Text("threeBounce"),
),
},
onValueChanged: (value) {
EasyLoading.instance.indicatorType = value;
},
),
),
],
),
),
],
),
),
),
);
}
}
class ExamplePage extends StatefulWidget {
@override
_ExamplePageState createState() => _ExamplePageState();
}
class _ExamplePageState extends State<ExamplePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("example"),
),
body: Container(
child: Text("example page"),
));
}
}
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