我有一个列表，显示来自端点的项目。当我发出HTTP请求时，该请求通过了，但是当我尝试滚动时，我得到了一半的数据，而在尾端，我得到了一个错误。有人可以帮我吗？我想向下滚动时显示的错误如下：
RangerError (index): invalid value: Not in range 0..7,
inclusive: 8
See also:
这些方法可以帮助我发出HTTP请求：
Future<void> get_farmer_eop() async {
SharedPreferences localStorage = await SharedPreferences.getInstance();
var userJson = localStorage.getString('loginRes');
user = json.decode(userJson);
print(user['UserName']);
final response = await http.get(
'http://api.ergagro.com:112/GenerateFarmersEop?farmerBvn=${widget.result}&dcOid=${widget.dc_result}&agentName=${user['UserName']}',
headers: _setHeaders());
print('${response.statusCode}popo');
if (response.statusCode == 200) {
final jsonStatus = jsonDecode(response.body);
var maineops = jsonStatus['Eop'];
var eoplines = maineops['EopLines'];
setState(() {
q = maineops;
r = eoplines;
});
// print('trandid');
// print('${q['TransId']}kukuk');
} else {
throw Exception();
}
}
_setHeaders() => {
'Content-type': 'application/json',
'Accept': 'application/json',
};
这是完整的代码：
//initializing
import 'dart:convert';
import 'package:erg_app/StartScan.dart';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:erg_app/models/eopModel.dart';
import 'package:shared_preferences/shared_preferences.dart';
class ProfilePage extends StatefulWidget {
final String result;
final String dc_result;
ProfilePage({this.result, this.dc_result});
@override
_ProfilePageState createState() => _ProfilePageState();
}
class _ProfilePageState extends State<ProfilePage> {
//From Eop Model
List<EopLine> eops = new List();
var p;
var q;
var r;
var user;
var userData;
var userDetail;
var anchors;
@override
initState() {
super.initState();
// _getUserInfo();
get_farmer();
get_farmer_eop();
}
@override
Widget build(BuildContext context) {
// TODO: implement build
return MaterialApp(
debugShowCheckedModeBanner: false,
home: p == null
? Scaffold(
body: Center(
child: CircularProgressIndicator(
valueColor: AlwaysStoppedAnimation<Color>(Colors.green),
backgroundColor: Colors.grey,
),
),
)
: Scaffold(
appBar: AppBar(
title: new Center(
child: new Text('Farmers Data', textAlign: TextAlign.left)),
iconTheme: IconThemeData(color: Colors.white),
backgroundColor: Colors.green,
leading: new IconButton(
icon: new Icon(Icons.assignment_ind),
onPressed: () {},
),
),
body: Container(
child: ListView(
children: <Widget>[
Container(
margin: EdgeInsets.only(top: 20),
),
Padding(
padding: EdgeInsets.only(left: 110, right: 110),
child: CircleAvatar(
radius: 80,
backgroundColor: Colors.grey,
backgroundImage: NetworkImage(p['PhotoUrl']),
),
),
Text(
p['FullName'],
style: TextStyle(
fontFamily: 'SourceSansPro',
fontSize: 25,
),
textAlign: TextAlign.center,
),
Text(
p['ApplicationId'],
style: TextStyle(
fontSize: 18,
fontFamily: 'SourceSansPro',
color: Colors.green[400],
letterSpacing: 2.5,
),
textAlign: TextAlign.center,
),
Container(
margin: EdgeInsets.only(top: 20),
),
SizedBox(
height: 20.0,
width: 200,
child: Divider(
color: Colors.teal[100],
),
),
Text(
'Farmer Details',
textAlign: TextAlign.center,
),
Card(
color: Colors.white,
margin: EdgeInsets.symmetric(
vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Text(
'Appication ID:',
style: TextStyle(
fontSize: 20,
fontFamily: 'SourceSansPro',
color: Colors.green[700],
letterSpacing: 2.5,
),
),
title: Text(
p['ApplicationId'],
style: TextStyle(
fontFamily: 'BalooBhai', fontSize: 20.0),
),
),
),
Card(
color: Colors.white,
margin: EdgeInsets.symmetric(
vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Text(
'BVN:',
style: TextStyle(
fontSize: 20,
fontFamily: 'SourceSansPro',
color: Colors.green[700],
letterSpacing: 2.5,
),
),
title: Text(
p['Bvn'],
style: TextStyle(
fontFamily: 'BalooBhai', fontSize: 20.0),
),
),
),
Card(
color: Colors.white,
margin: EdgeInsets.symmetric(
vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Text(
'Marital Status:',
style: TextStyle(
fontSize: 20,
fontFamily: 'SourceSansPro',
color: Colors.green[700],
letterSpacing: 2.5,
),
),
title: Text(
p['MaritalStatus'],
style: TextStyle(
fontFamily: 'BalooBhai', fontSize: 20.0),
),
),
),
Card(
color: Colors.white,
margin: EdgeInsets.symmetric(
vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Text(
'Anchor:',
style: TextStyle(
fontSize: 20,
fontFamily: 'SourceSansPro',
color: Colors.green[700],
letterSpacing: 2.5,
),
),
title: Text(
p['AnchorAcronym'],
style: TextStyle(
fontFamily: 'BalooBhai', fontSize: 20.0),
),
),
),
Card(
color: Colors.white,
margin: EdgeInsets.symmetric(
vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Text(
'Gender:',
style: TextStyle(
fontSize: 20,
fontFamily: 'SourceSansPro',
color: Colors.green[700],
letterSpacing: 2.5,
),
),
title: Text(
p['Gender'],
style: TextStyle(
fontFamily: 'BalooBhai', fontSize: 20.0),
),
),
),
Card(
color: Colors.white,
margin: EdgeInsets.symmetric(
vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Text(
'Phone:',
style: TextStyle(
fontSize: 20,
fontFamily: 'SourceSansPro',
color: Colors.green[700],
letterSpacing: 2.5,
),
),
title: Text(
p['PhoneNo'],
style: TextStyle(
fontFamily: 'BalooBhai', fontSize: 20.0),
),
),
),
Card(
color: Colors.white,
margin: EdgeInsets.symmetric(
vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Text(
'State/LGA:',
style: TextStyle(
fontSize: 20,
fontFamily: 'SourceSansPro',
color: Colors.green[700],
letterSpacing: 2.5,
),
),
title: Text(
'${p['State']} / ${p['Lga']}',
style: TextStyle(
fontFamily: 'BalooBhai', fontSize: 20.0),
),
),
),
Card(
color: Colors.white,
margin: EdgeInsets.symmetric(
vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Text(
'Farm Size:',
style: TextStyle(
fontSize: 20,
fontFamily: 'SourceSansPro',
color: Colors.green[700],
letterSpacing: 2.5,
),
),
title: Text(
'${p['Size']}',
style: TextStyle(
fontFamily: 'BalooBhai', fontSize: 20.0),
),
),
),
//Geo code was here
Divider(),
Row(
// mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
SizedBox(width: 15),
Icon(Icons.timelapse,
size: 30, color: Colors.green[400]),
SizedBox(width: 15),
Text(
'EOP Details',
style:
TextStyle(color: Colors.green[400], fontSize: 20),
),
],
),
Padding(
padding: const EdgeInsets.all(5.0),
child: Card(
elevation: 4.0,
color: Colors.grey[100],
margin: EdgeInsets.only(
left: 10, right: 10, top: 20, bottom: 10),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10)),
child: Container(
padding:
EdgeInsets.only(left: 15, top: 20, bottom: 10),
width: MediaQuery.of(context).size.width,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Container(width: 10),
Row(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(
left: 10, top: 10),
child: Text(
'TransId:',
textAlign: TextAlign.left,
style: TextStyle(
color: Color(0xFF9b9b9b),
fontSize: 14.0,
decoration: TextDecoration.none,
fontWeight: FontWeight.normal,
),
),
),
Padding(
padding: const EdgeInsets.only(
left: 50, top: 12),
child: Text(
q['TransId'],
// anchors[i]['Oid'].toString(),
textAlign: TextAlign.left,
style: TextStyle(
color: Colors.grey[700],
fontSize: 14.0,
decoration: TextDecoration.none,
fontWeight: FontWeight.normal,
),
),
),
],
),
Container(
height: 20,
),
// button was here
],
),
),
),
),
ListView.builder(
shrinkWrap: true,
itemCount: r.length,
itemBuilder: (BuildContext context, int i) {
////////////// 1st card///////////
return Card(
elevation: 4.0,
color: Colors.grey[100],
margin: EdgeInsets.only(
left: 10, right: 10, top: 20, bottom: 10),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10)),
child: SingleChildScrollView(
scrollDirection: Axis.vertical,
child: SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Container(
padding: EdgeInsets.only(
left: 15, top: 20, bottom: 10),
width: MediaQuery.of(context).size.width,
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: <Widget>[
Container(width: 10),
Row(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(
left: 10, top: 10),
child: LimitedBox(
child: Text(
'Item Name:',
textAlign: TextAlign.left,
style: TextStyle(
color: Color(0xFF9b9b9b),
fontSize: 14.0,
decoration:
TextDecoration.none,
fontWeight: FontWeight.normal,
),
),
),
),
Padding(
padding: const EdgeInsets.only(
left: 20, top: 12),
child: Flexible(
child: Text(
r[i]['ItemName'],
textAlign: TextAlign.left,
style: TextStyle(
color: Colors.grey[700],
fontSize: 14.0,
decoration:
TextDecoration.none,
fontWeight:
FontWeight.normal,
),
),
)),
],
),
Row(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(
left: 10, top: 10),
child: Flexible(
child: Text(
'Quantity Allocated:',
textAlign: TextAlign.left,
style: TextStyle(
color: Color(0xFF9b9b9b),
fontSize: 14.0,
decoration:
TextDecoration.none,
fontWeight: FontWeight.normal,
),
),
),
),
Padding(
padding: const EdgeInsets.only(
left: 20, top: 12),
child: Flexible(
child: Text(
'${r[i]['QuantityAllocated']}',
textAlign: TextAlign.left,
style: TextStyle(
color: Colors.grey[700],
fontSize: 14.0,
decoration:
TextDecoration.none,
fontWeight:
FontWeight.normal,
),
),
)),
],
),
Container(
height: 20,
),
// button was here
],
),
),
),
),
);
}),
Divider(),
Container(
margin: EdgeInsets.only(top: 20, bottom: 30),
child: Center(
child: RaisedButton(
padding: EdgeInsets.fromLTRB(80, 10, 80, 10),
color: Colors.green,
child: Text(
"Complete",
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.bold,
fontSize: 14),
),
onPressed: () {
Navigator.of(context).push(MaterialPageRoute(
builder: (context) =>
StartScanPage(widget.dc_result)));
},
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(50),
),
),
),
),
],
),
),
),
);
}
Future<void> get_farmer() async {
final response = await http
.get('http://api.ergagro.com:112/GetFarmerByBvn?Bvn=${widget.result}');
print('${response.statusCode}yoyo');
if (response.statusCode == 200) {
final jsonStatus = jsonDecode(response.body);
setState(() {
p = jsonStatus['Farmer'];
});
print('${p['Oid']}');
} else {
throw Exception();
}
}
Future<void> get_farmer_eop() async {
SharedPreferences localStorage = await SharedPreferences.getInstance();
var userJson = localStorage.getString('loginRes');
user = json.decode(userJson);
print(user['UserName']);
final response = await http.get(
'http://api.ergagro.com:112/GenerateFarmersEop?farmerBvn=${widget.result}&dcOid=${widget.dc_result}&agentName=${user['UserName']}',
headers: _setHeaders());
print('${response.statusCode}popo');
if (response.statusCode == 200) {
final jsonStatus = jsonDecode(response.body);
var maineops = jsonStatus['Eop'];
var eoplines = maineops['EopLines'];
setState(() {
q = maineops;
r = eoplines;
});
// print('trandid');
// print('${q['TransId']}kukuk');
} else {
throw Exception();
}
}
_setHeaders() => {
'Content-type': 'application/json',
'Accept': 'application/json',
};
}
class profile {
String name,
bvn,
phone,
appliId,
state,
farmsize,
geocord,
anchor,
lga,
gender,
maritalStatus;
profile(
this.name,
this.bvn,
this.phone,
this.appliId,
this.state,
this.farmsize,
this.geocord,
this.anchor,
this.lga,
this.gender,
this.maritalStatus);
}
答案 0 :(得分：0)
尝试使用r.length-1。应该会有帮助。