Материаллокализации не обнаружено - виджеты MyApp требуют, чтобы материализация была предоставлена ​​предком локализации ⇐ Android

[Anonymous]

Я просто пытался создать приложение с кнопкой, которая показывает сообщение о предупреждении при нажатии кнопки. < /p>

Но это дает мне эту ошибку (упоминается ниже). < /p>

Я написал этот код, взяв ссылку на это видео. < /p>

Я запускаю приложение на живом телефоне Android, используя ADB Connect < /p>

Пожалуйста, помогите ..! < /p>

code < /p>

import 'package:flutter/material.dart';

void main(){
runApp(MyApp());
}

class MyApp extends StatelessWidget{
@override
Widget build(BuildContext context) {
return MaterialApp(
title: "Test",
home: Scaffold(
appBar: AppBar(title: Text("Test")),
body: Container(
child: Center(
child: RaisedButton(
color: Colors.redAccent,
textColor: Colors.white,
onPressed: (){testAlert(context);},
child: Text("PressMe"),
),
),
),
),
);
}
void testAlert(BuildContext context){
var alert = AlertDialog(
title: Text("Test"),
content: Text("Done..!"),
);

showDialog(
context: context,
builder: (BuildContext context){
return alert;
}
);
}
}
< /code>

Это код, который я написал. Я также попытался вставить содержание функции testalert () непосредственно в эксплуатацию, но не работает. < /P>

ошибка < /p>

Performing hot reload...
Syncing files to device ZUK Z2131...
Reloaded 0 of 419 libraries in 1,929ms.
I/flutter (18652): ══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
I/flutter (18652): The following assertion was thrown while handling a gesture:
I/flutter (18652): No MaterialLocalizations found.
I/flutter (18652): MyApp widgets require MaterialLocalizations to be provided by a Localizations widget ancestor.
I/flutter (18652): Localizations are used to generate many different messages, labels,and abbreviations which are used
I/flutter (18652): by the material library.
I/flutter (18652): To introduce a MaterialLocalizations, either use a MaterialApp at the root of your application to
I/flutter (18652): include them automatically, or add a Localization widget with a MaterialLocalizations delegate.
I/flutter (18652): The specific widget that could not find a MaterialLocalizations ancestor was:
I/flutter (18652): MyApp
I/flutter (18652): The ancestors of this widget were:
I/flutter (18652): [root]
I/flutter (18652):
I/flutter (18652): When the exception was thrown, this was the stack:
I/flutter (18652): #0 debugCheckHasMaterialLocalizations. (package:flutter/src/material/debug.dart:124:7)
I/flutter (18652): #1 debugCheckHasMaterialLocalizations (package:flutter/src/material/debug.dart:127:4)
I/flutter (18652): #2 showDialog (package:flutter/src/material/dialog.dart:635:10)
I/flutter (18652): #3 MyApp.testAlert (package:flutter_app/main.dart:33:5)
I/flutter (18652): #4 MyApp.build. (package:flutter_app/main.dart:19:29)
I/flutter (18652): #5 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:507:14)
I/flutter (18652): #6 _InkResponseState.build. (package:flutter/src/material/ink_well.dart:562:30)
I/flutter (18652): #7 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
I/flutter (18652): #8 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
I/flutter (18652): #9 TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:175:7)
I/flutter (18652): #10 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315:9)
I/flutter (18652): #11 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73:12)
I/flutter (18652): #12 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:11)
I/flutter (18652): #13 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:180:19)
I/flutter (18652): #14 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:158:22)
I/flutter (18652): #15 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:138:7)
I/flutter (18652): #16 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:101:7)
I/flutter (18652): #17 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:85:7)
I/flutter (18652): #18 _invoke1 (dart:ui/hooks.dart:168:13)
I/flutter (18652): #19 _dispatchPointerDataPacket (dart:ui/hooks.dart:122:5)
I/flutter (18652):
I/flutter (18652): Handler: onTap
I/flutter (18652): Recognizer:
I/flutter (18652): TapGestureRecognizer#d5d82(debugOwner: GestureDetector, state: possible, won arena, finalPosition:
I/flutter (18652): Offset(220.2, 406.1), sent tap down)
I/flutter (18652): ════════════════════════════════════════════════════════════════════════════════════════════════════
W/ActivityThread(18652): handleWindowVisibility: no activity for token android.os.BinderProxy@59b4e8d
I/ViewRootImpl(18652): CPU Rendering VSync enable = true


Подробнее здесь: https://stackoverflow.com/questions/562 ... zations-to