您好,我想问一种方法使这项工作有效
我有一个记事本,例如questionslist.text
有此问题:
并使用这个问题作为窗口小部件中的文本形式的小部件
import 'package:flutter/material.dart';
class questionaires extends StatefulWidget {
@override
_questionairesState createState() => _questionairesState();
}
class _questionairesState extends State<questionaires> {
String q1 = "";
String q2 = "";
String q3 = "";
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
resizeToAvoidBottomInset: false,
body: Center(
child: Column(
children: <Widget>[
Text(q1),
Text(q2),
Text(q3)
],
),
),
),
);
}
}
您可以从最基本的方式开始从.txt
文件中检索问题,然后使用ListView
小部件显示它。
main.dart
import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Questions',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyAppScreen(),
);
}
}
class MyAppScreen extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return MyAppScreenState();
}
}
class MyAppScreenState extends State<MyAppScreen> {
List<String> _questions = [];
Future<List<String>> _loadQuestions() async {
List<String> questions = [];
await rootBundle.loadString('path/to/questions.txt').then((q) {
for (String i in LineSplitter().convert(q)) {
questions.add(i);
}
});
return questions;
}
@override
void initState() {
// Retrieve
_setup();
super.initState();
}
_setup() async {
// Request for the questions (Processed in the background)
List<String> questions = await _loadQuestions();
// Update the UI based on the questions retrieved
setState(() {
_questions = questions;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("Flutter Questions")),
body: Center(
child: Container(
child: ListView.builder(
itemCount: _questions.length,
itemBuilder: (context, index) {
return Text(_questions[index]);
},
),
),
),
);
}
}
这是问题的示例列表。
questions.txt
"How old are you?"
"Where do you live?"
"What is your age?"
在上面的示例代码中,您正在逐行解析文本文件。当您测试Flutter时,这对小型项目和示例项目很有用。但是您应该能够通过遵循Flutter的官方docs来更新该实现,以了解如何读写文件。
此外,如果您希望在Flutter项目中大展身手,则应研究如何在线托管问题的方法,例如。通过Rest API提供服务,然后使用http插件进行检索。
更多信息:
输出: