Flutter 未处理的exeption[177]堆栈溢出错误
所以，我是新的颤栗和尝试这段视频，我看到了。（事实上，我几乎完成了）在视频中，讲师经常尝试捕捉错误发生时的语句作为示例。这对他有效，但对我无效。所以我删除了我的try-and-catch，因为它以前是这样工作的，但我无法恢复我当时的陈述，我被困在了我以前的try-and-catch和今天的错误上。这是我在世界时间班上的代码Flutter 未处理的exeption[177]堆栈溢出错误,flutter,dart,stack,overflow,unhandled,Flutter,Dart,Stack,Overflow,Unhandled,所以，我是新的颤栗和尝试这段视频，我看到了。（事实上，我几乎完成了）在视频中，讲师经常尝试捕捉错误发生时的语句作为示例。这对他有效，但对我无效。所以我删除了我的try-and-catch，因为它以前是这样工作的，但我无法恢复我当时的陈述，我被困在了我以前的try-and-catch和今天的错误上。这是我在世界时间班上的代码 import 'package:http/http.dart'; import 'dart:convert'; class WorldTime { String loc
import 'package:http/http.dart';
import 'dart:convert';
class WorldTime {
String location;
String time;
String flag;
String url;
WorldTime({this.location, this.flag, this.url});
Future<void> getTime() async {
Response response = await get('http://worldtimeapi.org/api/timezone/$url');
Map data = jsonDecode(response.body);
//print(data);
String datetime = data['datetime'];
String offset = data['utc_offset'].substring(1, 3);
//print(datetime);
//print(offset);
DateTime now = DateTime.parse(datetime);
now = now.add(Duration(hours: int.parse(offset)));
time = now.toString();
}
WorldTime instance =
WorldTime(location: 'Berlin', flag: 'germany.png', url: 'Europe/Berlin');
}
import 'package:flutter/material.dart';
import 'package:worldtime_app/service/world_time.dart';
class Loading extends StatefulWidget {
@override
_LoadingState createState() => _LoadingState();
}
class _LoadingState extends State<Loading> {
String time = 'loading';
void setupworldtime() async {
WorldTime instance = WorldTime(
location: 'Berlin', flag: 'germany.png', url: 'Europe/Berlin');
await instance.getTime();
print(instance.time);
setState(() {
time = instance.time;
});
}
@override
void initState() {
super.initState();
setupworldtime();
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Padding(
padding: EdgeInsets.all(50.0),
child: Text(time),
),
);
}
}
import 'package:flutter/material.dart';
class Home extends StatefulWidget {
@override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Column(
children: <Widget>[
FlatButton.icon(
onPressed: () {
Navigator.pushNamed(context, '/Choose_Location');
},
icon: Icon(Icons.edit_location),
label: Text("Choose Location"),
),
],
),
),
);
}
}
import 'package:flutter/material.dart';
class Choose_Location extends StatefulWidget {
@override
_Choose_LocationState createState() => _Choose_LocationState();
}
class _Choose_LocationState extends State<Choose_Location> {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.grey[200],
appBar: AppBar(
backgroundColor: Colors.blue[900],
title: Text('Choose a Location'),
centerTitle: true,
elevation: 0,
),
body: RaisedButton(
onPressed: () {
setState(() {});
},
),
);
}
}
import 'package:flutter/material.dart';
import 'package:worldtime_app/pages/Home.dart';
import 'package:worldtime_app/pages/Loading.dart';
import 'package:worldtime_app/pages/Choose_Location.dart';
void main() => runApp(MaterialApp(
initialRoute: '/',
routes: {
'/': (context) => Loading(),
'/Home': (context) => Home(),
'/Choose_Location': (context) => Choose_Location(),
},
));