Flutter 引发了另一个异常:type';字符串';不是类型为';int';属于';得分';
使用以下代码,获取一个错误:Flutter 引发了另一个异常:type';字符串';不是类型为';int';属于';得分';,flutter,dart,Flutter,Dart,使用以下代码,获取一个错误: import 'package:flutter/material.dart'; import './quiz.dart'; import './result.dart'; void main() { runApp(_MyApp()); } class _MyApp extends StatefulWidget { @override State<StatefulWidget> createState() { // TODO: im
import 'package:flutter/material.dart';
import './quiz.dart';
import './result.dart';
void main() {
runApp(_MyApp());
}
class _MyApp extends StatefulWidget {
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return _MyAppState();
}
}
class _MyAppState extends State<_MyApp> {
final _questions = const [
{
'questionText': 'What\'s your favourite color ?',
'answers': [
{'text': 'Black', 'score': '1'},
{'text': 'Red', 'score': '2'},
{'text': 'Green', 'score': '3'},
{'text': 'Yellow', 'score': '0'},
],
},
{
'questionText': 'what\'s your favourite animal ?',
'answers': [
{'text': 'pig', 'score': '0'},
{'text': 'camel', 'score': '2'},
{'text': 'snake', 'score': '3'},
{'text': 'lion', 'score': '1'},
],
},
{
'questionText': 'What\'s your favourite instructor ?',
'answers': [
{'text': 'Niraj', 'score': '1'},
{'text': 'Torpea', 'score': '0'},
{'text': 'Nippo', 'score': '1'},
{'text': 'senihang', 'score': '3'},
],
},
];
var _questionIndex = 0;
var _totalScore = 0;
void _answerQuestion(int score ) {
_totalScore = score + _totalScore;
setState(() {
_questionIndex = _questionIndex + 1;
});
print(_questionIndex);
if (_questionIndex < _questions.length) {
print('We have more questions !');
} else {
print('No more questions ! ');
}
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text("My First App"),
),
body: _questionIndex < _questions.length
? Quiz(
answerQuestion: _answerQuestion,
questionIndex: _questionIndex,
questions: _questions,
)
: Result(_totalScore),
),
);
}
}
import 'package:flutter/material.dart';
import './answer.dart';
import './question.dart';
class Quiz extends StatelessWidget {
final List<Map<String, Object>> questions;
final int questionIndex;
final Function answerQuestion;
Quiz({
@required this.questions,
@required this.answerQuestion,
@required this.questionIndex,
});
@override
Widget build(BuildContext context) {
return Column(
children: [
Question(
questions[questionIndex]['questionText'],
),
...(questions[questionIndex]['answers'] as List<Map<String, Object>>)
.map((answer) {
return Answer(() => answerQuestion(answer['score']), answer['text']);
}).toList()
],
);
}
}
import 'package:flutter/material.dart';
class Result extends StatelessWidget {
final int resultScore;
Result(this.resultScore);
String get resultPhrase {
String resultText;
if (resultScore <= 3) {
resultText = ' You are awesome and innocent! ';
} else if (resultScore <= 4) {
resultText = ' Pretty Likeable! ';
} else if (resultScore <= 5) {
resultText = ' You are ... Strange ? !';
} else {
resultText = ' you are so bad ! ..';
}
return resultText;
}
@override
Widget build(BuildContext context) {
return Center(
child: Text(
resultPhrase,
style: TextStyle(fontSize: 36, fontWeight: FontWeight.bold),
textAlign: TextAlign.center,
),
);
}
}
import 'package:flutter/material.dart';
class Question extends StatelessWidget {
final String questionText;
Question(this.questionText);
@override
Widget build(BuildContext context) {
return Container(
width: double.infinity,
margin: EdgeInsets.all(10),
child: Text(
questionText,
style: TextStyle(fontSize: 28),
textAlign: TextAlign.center,
),
);
}
}
import 'package:flutter/material.dart';
class Answer extends StatelessWidget {
final Function selectHandler;
final String answerText;
Answer(this.selectHandler, this.answerText);
@override
Widget build(BuildContext context) {
return Container(
width: double.infinity,
child: RaisedButton(
color: Colors.blue,
textColor: Colors.white,
child: Text(answerText),
onPressed: selectHandler,
),
);
}
}
i am getting error when i am running my app.
An Observatory debugger and profiler on A1601 is available at: http://127.0.0.1:57877/pv6MXqvHOCg=/
I/flutter ( 7861): ══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
I/flutter ( 7861): The following _TypeError was thrown while handling a gesture:
I/flutter ( 7861): type 'String' is not a subtype of type 'int' of 'score'
I/flutter ( 7861): When the exception was thrown, this was the stack:
I/flutter ( 7861): #0 Quiz.build.<anonymous closure>.<anonymous closure> (package:youtube_course_01/quiz.dart:23:45)
I/flutter ( 7861): #1 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:992:19)
I/flutter ( 7861): #2 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1098:38)
I/flutter ( 7861): #3 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:184:24)
I/flutter ( 7861): #4 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:524:11)
I/flutter ( 7861): #5 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:284:5)
I/flutter ( 7861): #6 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:219:7)
I/flutter ( 7861): #7 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:477:9)
I/flutter ( 7861): #8 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:78:12)
I/flutter ( 7861): #9 PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:124:9)
I/flutter ( 7861): #10 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:377:8)
I/flutter ( 7861): #11 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:122:18)
I/flutter ( 7861): #12 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:108:7)
I/flutter ( 7861): #13 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:220:19)
I/flutter ( 7861): #14 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:200:22)
I/flutter ( 7861): #15 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:158:7)
I/flutter ( 7861): #16 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:104:7)
I/flutter ( 7861): #17 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:88:7)
I/flutter ( 7861): #21 _invoke1 (dart:ui/hooks.dart:267:10)
I/flutter ( 7861): #22 _dispatchPointerDataPacket (dart:ui/hooks.dart:176:5)
I/flutter ( 7861): (elided 3 frames from dart:async)
I/flutter ( 7861): Handler: "onTap"
I/flutter ( 7861): Recognizer:
I/flutter ( 7861): TapGestureRecognizer#b5bcf
I/flutter ( 7861): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter ( 7861): Another exception was thrown: type 'String' is not a subtype of type 'int' of 'score'
导入“包装:颤振/材料.省道”;
导入“/quick.dart”;
导入“/result.dart”;
void main(){
runApp(_MyApp());
}
类_MyApp扩展StatefulWidget{
@凌驾
状态createState(){
//TODO:实现createState
返回_MyAppState();
}
}
类MyAppState扩展了状态{
最终问题=常数[
{
“问题文本”:“你最喜欢什么颜色?”,
“答案”:[
{'text':'Black','score':'1'},
{'text':'Red','score':'2'},
{'text':'Green','score':'3'},
{'text':'Yellow','score':'0'},
],
},
{
“问题文本”:“你最喜欢的动物是什么?”,
“答案”:[
{'text':'pig','score':'0'},
{'text':'camel','score':'2'},
{'text':'snake','score':'3'},
{'text':'lion','score':'1'},
],
},
{
“问题文本”:“你最喜欢的教练是什么?”,
“答案”:[
{'text':'Niraj','score':'1'},
{'text':'Torpea','score':'0'},
{'text':'Nippo','score':'1'},
{'text':'senihang','score':'3'},
],
},
];
var _指数=0;
var _totalScore=0;
无效回答问题(整数分数){
_总分=总分+总分;
设置状态(){
_问题索引=_问题索引+1;
});
打印(索引);
如果(问题索引<问题长度){
打印(“我们还有更多问题!”);
}否则{
打印('不再有问题!');
}
}
@凌驾
小部件构建(构建上下文){
返回材料PP(
家:脚手架(
appBar:appBar(
标题:文本(“我的第一个应用”),
),
正文:\问题索引<\问题长度
?测验(
回答问题:\回答问题,
问题索引:_questionIndex,
问题:_问题,
)
:结果(_总分),
),
);
}
}
进口“包装:颤振/材料.省道”;
导入“/answer.dart”;
导入“/question.dart”;
类小部件{
最后问题清单;
最终问卷调查指标;
最终功能回答问题;
测验({
@要求回答这个问题,
@需要回答这个问题,
@需要这个索引,
});
@凌驾
小部件构建(构建上下文){
返回列(
儿童:[
问题:(
问题[questionIndex]['questionText'],
),
…(问题[问题索引][答案]列表)
.map((答案){
返回答案(()=>answerQuestion(答案['score']),答案['text']);
})托利斯先生()
],
);
}
}
进口“包装:颤振/材料.省道”;
类结果扩展了无状态小部件{
最终结果中心;
结果(this.resultScore);
字符串获取结果短语{
字符串resultText;
if(resultScore这里的问题是,您正在发送一个等待int的字符串。
如果我没有弄错,错误就在这一行:返回答案(()=>answerQuestion(答案['score'))
我认为您应该这样做,而不是返回答案(()=>answerQuestion(int.parse(答案['score']))
除非您显示抛出错误的具体行并显示代码的详细示例,否则我们无法帮助您。将所有代码复制并粘贴到stack overflow中会使您的问题变得臃肿,因此我们无法帮助您。我对Stackoverflow和Flatter也很陌生。因此,很抱歉以愚蠢的方式提问。希望我能理解把它弄出来!谢谢