【发布时间】：2018-01-08 01:24:42
【问题描述】：
寻找一些关于动态构建expansionTile 列表的指导。我有一个从 json API 动态构建的成功的 Listview，但找不到任何关于构建 expandTile 的示例。我有 1 个 api 调用带回顶层，另一个调用每个顶层带回扩展列表。有人有这方面的例子吗？我找到了静态示例，但不清楚如何使其成为动态示例。
这是我想出的一些代码。我可以看到 Tile 标题部分，并且可以看到 json 进入 tile 正文，但无法弄清楚如何在正文中获取列表标题的正确名称，我没有尝试将其设置为有效。有什么想法吗？
import 'dart:async';
import 'package:intl/intl.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
//import 'package:shared_preferences/shared_preferences.dart';
import 'package:http/http.dart' as http;
//import 'package:cswauthapp/models.dart';
import 'package:flutter/foundation.dart';
import 'dart:convert';
var jsonCodec = const JsonCodec();
List<Exp> myReasonList;
List myDCList;
int mycount = 0;
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'ExpansionTile Test',
home: new MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
void initState() {
super.initState();
_getData();
//_getSpecialty();
}
_getData() async {
var _url = 'http://$baseurl:8080/support/dc/1';
var http = createHttpClient();
var response = await http.get(_url);
var dc = await jsonCodec.decode(response.body);
myDCList = await dc.toList();
print('DC: '+myDCList.toString());
if (mounted) {
setState(() {
//_dataReceived = true;
mycount = myDCList.length;
});
}
}
Future _getChildren(int did) async {
var _url2 = 'http://174.138.61.246:8080/support/dcreasons/$did';
var http = createHttpClient();
var response = await http.get(_url2);
var reasons = await jsonCodec.decode(response.body);
myReasonList = await reasons.toList();
print('REASONS: '+ myReasonList.toString());
return myReasonList;
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('ExpansionTile Test'),
),
body: new ListView.builder(
itemBuilder: _itemBuilder,
itemCount: mycount,
),
);
}
Widget _itemBuilder(BuildContext context, int index) {
Exp exp = getExp(index);
return new ListChild(exp: exp,);
}
Exp getExp(int index) {
return new Exp(
myDCList[index]['dname'],
_getChildren(myDCList[index]['did']),
);
//return new Specialties.fromMap(mylist[index]);
}
}
class Exp {
Exp(this.title, [this.children]);
final String title;
final Future<List<Exp>> children;
}
class ListChild extends StatefulWidget {
ListChild({Key key, this.exp}) : super(key: key);
final Exp exp;
@override
State createState() => new ListChildState();
}
class ListChildState extends State<ListChild> {
//PageStorageKey<ListChildState> _key = new PageStorageKey(ListChild);
@override
Widget build(BuildContext context) {
return new ExpansionTile(
key: new PageStorageKey(ListChild),
title: new Text(widget.exp.title),
children: <Widget>[
new Text(widget.exp.children.title),
],
);
}
}
【问题讨论】：
-
能否请您删除最后的编辑并提出一个新问题？否则没有人会知道这个问题到底是关于什么的。
-
抱歉，我删除并添加了另一个问题。
标签： flutter