小编Hel*_*ood的帖子

我似乎无法弄清楚这一点，所以请如果有人可以帮助我，我有点陷入困境！

import 'dart:async';\nimport 'dart:convert';\nimport 'package:http/http.dart' as HTTP;\nimport 'package:flutter/material.dart';\nimport 'package:coding/Data.dart';\n\n\nvoid main()=>\nrunApp(new MaterialApp(\n  home: MyApp(),\n  debugShowCheckedModeBanner: false,\n));\nclass MyApp extends StatefulWidget {\n@override\n_MyAppState createState() => _MyAppState();\n}\n\nclass _MyAppState extends State<MyApp> {\n@override\nWidget build(BuildContext context) {\ntry {\n  return Scaffold(\n    appBar: AppBar(\n      backgroundColor: Colors.transparent,\n      actions: [new IconButton(icon: Icon(Icons.arrow_back_ios), onPressed: (){}),],\n    ),\n    body: ListView(\n        children: <Widget>[\n          new Container(\n            height: 500.0,\n            margin: EdgeInsets.all(7.0),\n            child: new FutureBuilder(\n              future: getAllData(),\n              builder: (BuildContext c,AsyncSnapshot snapshot) {\n                  return ListView.builder(\n                    itemCount: snapshot.data.length,\n                    itemBuilder: (BuildContext c,int index) {\n                      return Card(\n                        elevation: 10.0,\n                        child: new Column(\n …