Разница между void main() => runApp(MaterialApp(home:MyApp())); и void main() => runApp(MyApp()); ⇐ Android

[Anonymous]

Это мой код для поднятой кнопки во Flutter, если я заменю
void main() => runApp(MaterialApp(home:MyApp()));
на
void main() => runApp(MyApp());
Это выдает ошибку
Предоставьте мне решение для это...... Имеет ли это какое-либо отношение к версиям флаттера и плагинов флаттера?
и может ли кто-нибудь указать разницу между этими двумя строками?
import 'package:flutter/material.dart';

void main() => runApp(MaterialApp(home:MyApp()));

class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}

class _MyAppState extends State {
@override
Widget build(BuildContext context) {
return Container(
child: Center(
child: RaisedButton(
child: Text("Hello"),
onPressed: (){
print("Hello world");
},
)
),
);
}
}

Ошибка:
Performing hot restart...
Syncing files to device SM G965F...
Restarted application in 1,759ms.
I/flutter (22269): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (22269): The following assertion was thrown building InkWell(gestures: [tap], clipped to BoxShape.rectangle,
I/flutter (22269): dirty, state: _InkResponseState#db17e):
I/flutter (22269): No Directionality widget found.
I/flutter (22269): InkWell widgets require a Directionality widget ancestor.
I/flutter (22269): The specific widget that could not find a Directionality ancestor was:
I/flutter (22269): InkWell
I/flutter (22269): The ownership chain for the affected widget is: "InkWell ← DefaultTextStyle ←
I/flutter (22269): AnimatedDefaultTextStyle ← _InkFeatures-[GlobalKey#cee82 ink renderer] ←
I/flutter (22269): NotificationListener ← CustomPaint ← _ShapeBorderPaint ← PhysicalShape
I/flutter (22269): ← _MaterialInterior ← Material ← ⋯"
I/flutter (22269): Typically, the Directionality widget is introduced by the MaterialApp or WidgetsApp widget at the
I/flutter (22269): top of your application widget tree. It determines the ambient reading direction and is used, for
I/flutter (22269): example, to determine how to lay out text, how to interpret "start" and "end" values, and to resolve
I/flutter (22269): EdgeInsetsDirectional, AlignmentDirectional, and other *Directional objects.
I/flutter (22269):
I/flutter (22269): The relevant error-causing widget was:
I/flutter (22269): RaisedButton file:///F:/Flutter_Projects/flutter_test_app/lib/main.dart:16:18
I/flutter (22269):
I/flutter (22269): When the exception was thrown, this was the stack:
I/flutter (22269): #0 debugCheckHasDirectionality. (package:flutter/src/widgets/debug.dart:247:7)
I/flutter (22269): #1 debugCheckHasDirectionality (package:flutter/src/widgets/debug.dart:263:4)
I/flutter (22269): #2 InkResponse.debugCheckContext (package:flutter/src/material/ink_well.dart:521:12)
I/flutter (22269): #3 _InkResponseState.build (package:flutter/src/material/ink_well.dart:843:19)
I/flutter (22269): #4 StatefulElement.build (package:flutter/src/widgets/framework.dart:4619:28)
I/flutter (22269): #5 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4502:15)
I/flutter (22269): #6 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4675:11)
I/flutter (22269): #7 Element.rebuild (package:flutter/src/widgets/framework.dart:4218:5)
I/flutter (22269): #8 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4481:5)
I/flutter (22269): #9 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4666:11)
I/flutter (22269): #10 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4476:5)
I/flutter (22269): ... Normal element mounting (92 frames)
I/flutter (22269): #102 Element.inflateWidget (package:flutter/src/widgets/framework.dart14)
I/flutter (22269): #103 Element.updateChild (package:flutter/src/widgets/framework.dart18)
I/flutter (22269): #104 RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart16)
I/flutter (22269): #105 RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart5)
I/flutter (22269): #106 RenderObjectToWidgetAdapter.attachToRenderTree. (package:flutter/src/widgets/binding.dart17)
I/flutter (22269): #107 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart19)
I/flutter (22269): #108 RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart13)
I/flutter (22269): #109 WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:941:7)
I/flutter (22269): #110 WidgetsBinding.scheduleAttachRootWidget. (package:flutter/src/widgets/binding.dart:922:7)
I/flutter (22269): (elided 11 frames from class _RawReceivePortImpl, class _Timer, dart:async, and dart:async-patch)
I/flutter (22269):
I/flutter (22269): ════════════════════════════════════════════════════════════════════════════════════════════════════


Подробнее здесь: https://stackoverflow.com/questions/612 ... nd-void-ma