I get this error in my code where I get stocks data from an API and the link changes according to a for loop on a list in the same class. my code is below.
ive tried calling the code like this
value: jsonDecode(mydata.body)["Time Series (5min)"][0]["1. open"],
change: jsonDecode(mydata.body)["Time Series (5min)"][0]["5. volume"],
it dosent work. please help this is the main code.
import 'package:flutter/material.dart';
import '../models/stock_details.dart';
import 'package:http/http.dart';
import 'dart:convert';
class StockList extends StatefulWidget {
@override
State<StockList> createState() => _StockListState();
}
class _StockListState extends State<StockList> {
@override
void initState() {
getData();
super.initState();
}
void getData() async {
int i = 1;
List<String> initalstocks = ["TCS", "BTC", "IBM"];
for (var element in initalstocks) {
Response mydata = await get(Uri.parse(
"https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY&symbol=$element&interval=5min&apikey=RTILMV6RV0R20DKC"));
Map decodeBodyData = jsonDecode(mydata.body);
Map body_data = decodeBodyData["Time Series (5min)"];
String open = body_data[0]["1. open".toString()];
print(open);
stockname.add(Stock(
id: i.toString(),
name: element,
value: 1,
change: 2,
));
i = 1;
}
}
final List<Stock> stockname = [];
@override
Widget build(BuildContext context) {
return ListView(
children: [
const SizedBox(
height: 1,
width: double.infinity,
child: DecoratedBox(
decoration: BoxDecoration(color: Colors.grey),
),
),
Column(
children: stockname.map((stx) {
return Column(
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Container(
height: 100,
alignment: Alignment.centerLeft,
child: Text(
stx.name,
style: const TextStyle(
color: Colors.white,
),
),
),
Column(
children: [
Text(
'\$${stx.value.toString()}',
style: const TextStyle(
color: Colors.white,
),
),
Text(
'\$${stx.change.toString()}',
style: const TextStyle(
color: Colors.white,
),
),
],
)
],
),
const SizedBox(
height: 1,
width: double.infinity,
child: DecoratedBox(
decoration: BoxDecoration(color: Colors.grey),
),
),
],
);
}).toList(),
),
],
);
}
}
Tis is class constructor i use to map data into the widgets.
import 'package:flutter/material.dart';
class Stock {
var id;
var name;
var value;
var change;
Stock({
this.id,
this.name,
this.value,
this.change,
});
}
CodePudding user response：
Trying out your url like https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY&symbol=TCS&interval=5min&apikey=RTILMV6RV0R20DKC gives:
{
"Meta Data": {
"1. Information": "Intraday (5min) open, high, low, close prices and volume",
"2. Symbol": "TCS",
"3. Last Refreshed": "2023-01-26 19:05:00",
"4. Interval": "5min",
"5. Output Size": "Compact",
"6. Time Zone": "US/Eastern"
},
"Time Series (5min)": {
"2023-01-26 19:05:00": {
"1. open": "5.1200",
"2. high": "5.1200",
"3. low": "5.1200",
"4. close": "5.1200",
"5. volume": "500"
},
"2023-01-26 16:00:00": {
"1. open": "5.0900",
"2. high": "5.1100",
"3. low": "5.0800",
"4. close": "5.1100",
"5. volume": "11474"
},
"2023-01-26 15:55:00": {
"1. open": "5.0700",
"2. high": "5.1100",
"3. low": "5.0700",
"4. close": "5.0900",
"5. volume": "8234"
},
"2023-01-26 15:50:00": {
"1. open": "5.0800",
"2. high": "5.0800",
"3. low": "5.0700",
"4. close": "5.0700",
"5. volume": "3264"
},
"2023-01-26 15:45:00": {
"1. open": "5.0850",
"2. high": "5.0850",
"3. low": "5.0800",
"4. close": "5.0800",
"5. volume": "1304"
},
"2023-01-26 15:40:00": {
"1. open": "5.1050",
"2. high": "5.1050",
"3. low": "5.0800",
"4. close": "5.0800",
"5. volume": "5462"
},
"2023-01-26 15:35:00": {
"1. open": "5.1050",
"2. high": "5.1100",
"3. low": "5.1000",
"4. close": "5.1100",
"5. volume": "918"
},
"2023-01-26 15:30:00": {
"1. open": "5.0950",
"2. high": "5.1100",
"3. low": "5.0950",
"4. close": "5.1100",
"5. volume": "7920"
},
"2023-01-26 15:25:00": {
"1. open": "5.1150",
"2. high": "5.1150",
"3. low": "5.0850",
"4. close": "5.0950",
"5. volume": "3245"
},
"2023-01-26 15:20:00": {
"1. open": "5.1100",
"2. high": "5.1150",
"3. low": "5.1000",
"4. close": "5.1100",
"5. volume": "2084"
},
"2023-01-26 15:15:00": {
"1. open": "5.1159",
"2. high": "5.1159",
"3. low": "5.1000",
"4. close": "5.1000",
"5. volume": "1153"
},
"2023-01-26 15:10:00": {
"1. open": "5.1300",
"2. high": "5.1300",
"3. low": "5.1100",
"4. close": "5.1100",
"5. volume": "1867"
},
"2023-01-26 15:05:00": {
"1. open": "5.1200",
"2. high": "5.1264",
"3. low": "5.1200",
"4. close": "5.1264",
"5. volume": "302"
},
"2023-01-26 15:00:00": {
"1. open": "5.1550",
"2. high": "5.1550",
"3. low": "5.1300",
"4. close": "5.1300",
"5. volume": "4353"
},
"2023-01-26 14:55:00": {
"1. open": "5.1600",
"2. high": "5.1600",
"3. low": "5.1550",
"4. close": "5.1558",
"5. volume": "621"
},
"2023-01-26 14:50:00": {
"1. open": "5.1600",
"2. high": "5.1612",
"3. low": "5.1500",
"4. close": "5.1500",
"5. volume": "532"
},
"2023-01-26 14:45:00": {
"1. open": "5.1600",
"2. high": "5.1700",
"3. low": "5.1500",
"4. close": "5.1600",
"5. volume": "3595"
},
"2023-01-26 14:30:00": {
"1. open": "5.1600",
"2. high": "5.1600",
"3. low": "5.1600",
"4. close": "5.1600",
"5. volume": "101"
},
"2023-01-26 14:25:00": {
"1. open": "5.1600",
"2. high": "5.1700",
"3. low": "5.1600",
"4. close": "5.1600",
"5. volume": "2419"
},
"2023-01-26 14:20:00": {
"1. open": "5.1600",
"2. high": "5.1600",
"3. low": "5.1600",
"4. close": "5.1600",
"5. volume": "708"
},
"2023-01-26 14:15:00": {
"1. open": "5.1600",
"2. high": "5.1600",
"3. low": "5.1600",
"4. close": "5.1600",
"5. volume": "440"
},
"2023-01-26 14:05:00": {
"1. open": "5.1600",
"2. high": "5.1600",
"3. low": "5.1600",
"4. close": "5.1600",
"5. volume": "901"
},
"2023-01-26 14:00:00": {
"1. open": "5.1611",
"2. high": "5.1611",
"3. low": "5.1600",
"4. close": "5.1600",
"5. volume": "2275"
},
"2023-01-26 13:55:00": {
"1. open": "5.1650",
"2. high": "5.1650",
"3. low": "5.1650",
"4. close": "5.1650",
"5. volume": "100"
},
"2023-01-26 13:50:00": {
"1. open": "5.1600",
"2. high": "5.1650",
"3. low": "5.1600",
"4. close": "5.1650",
"5. volume": "304"
},
"2023-01-26 13:45:00": {
"1. open": "5.1608",
"2. high": "5.1650",
"3. low": "5.1500",
"4. close": "5.1600",
"5. volume": "2632"
},
"2023-01-26 13:40:00": {
"1. open": "5.1600",
"2. high": "5.1643",
"3. low": "5.1600",
"4. close": "5.1643",
"5. volume": "918"
},
"2023-01-26 13:35:00": {
"1. open": "5.1500",
"2. high": "5.1600",
"3. low": "5.1500",
"4. close": "5.1600",
"5. volume": "1345"
},
"2023-01-26 13:30:00": {
"1. open": "5.1500",
"2. high": "5.1500",
"3. low": "5.1400",
"4. close": "5.1450",
"5. volume": "514"
},
"2023-01-26 13:25:00": {
"1. open": "5.1500",
"2. high": "5.1500",
"3. low": "5.1400",
"4. close": "5.1400",
"5. volume": "406"
},
"2023-01-26 13:20:00": {
"1. open": "5.1500",
"2. high": "5.1500",
"3. low": "5.1500",
"4. close": "5.1500",
"5. volume": "250"
},
"2023-01-26 13:10:00": {
"1. open": "5.1600",
"2. high": "5.1600",
"3. low": "5.1500",
"4. close": "5.1500",
"5. volume": "1220"
},
"2023-01-26 13:05:00": {
"1. open": "5.1600",
"2. high": "5.1600",
"3. low": "5.1500",
"4. close": "5.1500",
"5. volume": "3029"
},
"2023-01-26 13:00:00": {
"1. open": "5.1600",
"2. high": "5.1600",
"3. low": "5.1600",
"4. close": "5.1600",
"5. volume": "100"
},
"2023-01-26 12:55:00": {
"1. open": "5.1400",
"2. high": "5.1600",
"3. low": "5.1400",
"4. close": "5.1600",
"5. volume": "1380"
},
"2023-01-26 12:50:00": {
"1. open": "5.1275",
"2. high": "5.1275",
"3. low": "5.1275",
"4. close": "5.1275",
"5. volume": "811"
},
"2023-01-26 12:45:00": {
"1. open": "5.1272",
"2. high": "5.1400",
"3. low": "5.1200",
"4. close": "5.1300",
"5. volume": "2338"
},
"2023-01-26 12:40:00": {
"1. open": "5.1300",
"2. high": "5.1300",
"3. low": "5.1300",
"4. close": "5.1300",
"5. volume": "100"
},
"2023-01-26 12:35:00": {
"1. open": "5.1300",
"2. high": "5.1300",
"3. low": "5.1300",
"4. close": "5.1300",
"5. volume": "200"
},
"2023-01-26 12:30:00": {
"1. open": "5.1400",
"2. high": "5.1400",
"3. low": "5.1300",
"4. close": "5.1300",
"5. volume": "210"
},
"2023-01-26 12:15:00": {
"1. open": "5.1300",
"2. high": "5.1300",
"3. low": "5.1300",
"4. close": "5.1300",
"5. volume": "677"
},
"2023-01-26 12:10:00": {
"1. open": "5.1300",
"2. high": "5.1300",
"3. low": "5.1300",
"4. close": "5.1300",
"5. volume": "957"
},
"2023-01-26 12:05:00": {
"1. open": "5.1100",
"2. high": "5.1200",
"3. low": "5.1100",
"4. close": "5.1115",
"5. volume": "1349"
},
"2023-01-26 12:00:00": {
"1. open": "5.1100",
"2. high": "5.1100",
"3. low": "5.1100",
"4. close": "5.1100",
"5. volume": "294"
},
"2023-01-26 11:55:00": {
"1. open": "5.1100",
"2. high": "5.1200",
"3. low": "5.1100",
"4. close": "5.1200",
"5. volume": "1289"
},
"2023-01-26 11:45:00": {
"1. open": "5.1100",
"2. high": "5.1100",
"3. low": "5.1100",
"4. close": "5.1100",
"5. volume": "340"
},
"2023-01-26 11:40:00": {
"1. open": "5.1100",
"2. high": "5.1300",
"3. low": "5.1100",
"4. close": "5.1100",
"5. volume": "7564"
},
"2023-01-26 11:35:00": {
"1. open": "5.1000",
"2. high": "5.1100",
"3. low": "5.1000",
"4. close": "5.1100",
"5. volume": "796"
},
"2023-01-26 11:25:00": {
"1. open": "5.0900",
"2. high": "5.0900",
"3. low": "5.0900",
"4. close": "5.0900",
"5. volume": "300"
},
"2023-01-26 11:20:00": {
"1. open": "5.0900",
"2. high": "5.1000",
"3. low": "5.0900",
"4. close": "5.1000",
"5. volume": "500"
},
"2023-01-26 11:10:00": {
"1. open": "5.0900",
"2. high": "5.0900",
"3. low": "5.0800",
"4. close": "5.0800",
"5. volume": "300"
},
"2023-01-26 11:05:00": {
"1. open": "5.0800",
"2. high": "5.0800",
"3. low": "5.0715",
"4. close": "5.0800",
"5. volume": "1236"
},
"2023-01-26 11:00:00": {
"1. open": "5.0601",
"2. high": "5.0800",
"3. low": "5.0601",
"4. close": "5.0700",
"5. volume": "2800"
},
"2023-01-26 10:55:00": {
"1. open": "5.0700",
"2. high": "5.0700",
"3. low": "5.0700",
"4. close": "5.0700",
"5. volume": "400"
},
"2023-01-26 10:50:00": {
"1. open": "5.0209",
"2. high": "5.0650",
"3. low": "5.0209",
"4. close": "5.0650",
"5. volume": "8281"
},
"2023-01-26 10:45:00": {
"1. open": "5.0222",
"2. high": "5.0222",
"3. low": "5.0200",
"4. close": "5.0200",
"5. volume": "853"
},
"2023-01-26 10:40:00": {
"1. open": "5.0400",
"2. high": "5.0400",
"3. low": "5.0200",
"4. close": "5.0200",
"5. volume": "692"
},
"2023-01-26 10:35:00": {
"1. open": "5.0400",
"2. high": "5.0400",
"3. low": "5.0400",
"4. close": "5.0400",
"5. volume": "102"
},
"2023-01-26 10:30:00": {
"1. open": "5.0500",
"2. high": "5.0500",
"3. low": "5.0500",
"4. close": "5.0500",
"5. volume": "1703"
},
"2023-01-26 10:20:00": {
"1. open": "5.0500",
"2. high": "5.0500",
"3. low": "5.0490",
"4. close": "5.0490",
"5. volume": "716"
},
"2023-01-26 10:15:00": {
"1. open": "5.0500",
"2. high": "5.0500",
"3. low": "5.0400",
"4. close": "5.0400",
"5. volume": "1959"
},
"2023-01-26 10:10:00": {
"1. open": "5.0400",
"2. high": "5.0450",
"3. low": "5.0350",
"4. close": "5.0350",
"5. volume": "5542"
},
"2023-01-26 10:05:00": {
"1. open": "5.0400",
"2. high": "5.0450",
"3. low": "5.0400",
"4. close": "5.0450",
"5. volume": "1231"
},
"2023-01-26 10:00:00": {
"1. open": "5.0500",
"2. high": "5.0500",
"3. low": "5.0300",
"4. close": "5.0500",
"5. volume": "6856"
},
"2023-01-26 09:40:00": {
"1. open": "5.0736",
"2. high": "5.0800",
"3. low": "5.0736",
"4. close": "5.0800",
"5. volume": "1222"
},
"2023-01-26 09:35:00": {
"1. open": "5.0500",
"2. high": "5.1000",
"3. low": "5.0500",
"4. close": "5.1000",
"5. volume": "2534"
},
"2023-01-25 16:05:00": {
"1. open": "5.0100",
"2. high": "5.0100",
"3. low": "5.0100",
"4. close": "5.0100",
"5. volume": "755"
},
"2023-01-25 16:00:00": {
"1. open": "5.0000",
"2. high": "5.0200",
"3. low": "5.0000",
"4. close": "5.0100",
"5. volume": "11066"
},
"2023-01-25 15:55:00": {
"1. open": "5.0150",
"2. high": "5.0150",
"3. low": "5.0000",
"4. close": "5.0050",
"5. volume": "4068"
},
"2023-01-25 15:50:00": {
"1. open": "5.0100",
"2. high": "5.0200",
"3. low": "5.0100",
"4. close": "5.0150",
"5. volume": "2870"
},
"2023-01-25 15:45:00": {
"1. open": "5.0150",
"2. high": "5.0150",
"3. low": "5.0100",
"4. close": "5.0150",
"5. volume": "2122"
},
"2023-01-25 15:40:00": {
"1. open": "5.0150",
"2. high": "5.0150",
"3. low": "5.0150",
"4. close": "5.0150",
"5. volume": "1753"
},
"2023-01-25 15:35:00": {
"1. open": "5.0200",
"2. high": "5.0250",
"3. low": "5.0100",
"4. close": "5.0150",
"5. volume": "6132"
},
"2023-01-25 15:30:00": {
"1. open": "5.0200",
"2. high": "5.0300",
"3. low": "5.0200",
"4. close": "5.0300",
"5. volume": "1332"
},
"2023-01-25 15:25:00": {
"1. open": "5.0200",
"2. high": "5.0300",
"3. low": "5.0101",
"4. close": "5.0200",
"5. volume": "2641"
},
"2023-01-25 15:20:00": {
"1. open": "5.0050",
"2. high": "5.0200",
"3. low": "5.0050",
"4. close": "5.0200",
"5. volume": "2011"
},
"2023-01-25 15:15:00": {
"1. open": "4.9900",
"2. high": "5.0300",
"3. low": "4.9900",
"4. close": "5.0000",
"5. volume": "17228"
},
"2023-01-25 15:10:00": {
"1. open": "4.9900",
"2. high": "4.9900",
"3. low": "4.9900",
"4. close": "4.9900",
"5. volume": "2124"
},
"2023-01-25 15:05:00": {
"1. open": "4.9900",
"2. high": "4.9900",
"3. low": "4.9900",
"4. close": "4.9900",
"5. volume": "930"
},
"2023-01-25 15:00:00": {
"1. open": "4.9750",
"2. high": "5.0000",
"3. low": "4.9750",
"4. close": "4.9900",
"5. volume": "3231"
},
"2023-01-25 14:55:00": {
"1. open": "4.9750",
"2. high": "4.9750",
"3. low": "4.9750",
"4. close": "4.9750",
"5. volume": "100"
},
"2023-01-25 14:50:00": {
"1. open": "4.9700",
"2. high": "4.9800",
"3. low": "4.9700",
"4. close": "4.9800",
"5. volume": "532"
},
"2023-01-25 14:45:00": {
"1. open": "4.9700",
"2. high": "4.9700",
"3. low": "4.9600",
"4. close": "4.9600",
"5. volume": "242"
},
"2023-01-25 14:40:00": {
"1. open": "4.9700",
"2. high": "4.9700",
"3. low": "4.9600",
"4. close": "4.9600",
"5. volume": "211"
},
"2023-01-25 14:35:00": {
"1. open": "4.9550",
"2. high": "4.9700",
"3. low": "4.9550",
"4. close": "4.9700",
"5. volume": "1513"
},
"2023-01-25 14:30:00": {
"1. open": "4.9700",
"2. high": "4.9700",
"3. low": "4.9600",
"4. close": "4.9600",
"5. volume": "1736"
},
"2023-01-25 14:25:00": {
"1. open": "4.9700",
"2. high": "4.9800",
"3. low": "4.9700",
"4. close": "4.9700",
"5. volume": "1467"
},
"2023-01-25 14:20:00": {
"1. open": "4.9700",
"2. high": "4.9800",
"3. low": "4.9700",
"4. close": "4.9800",
"5. volume": "3459"
},
"2023-01-25 14:15:00": {
"1. open": "4.9400",
"2. high": "4.9700",
"3. low": "4.9400",
"4. close": "4.9700",
"5. volume": "4816"
},
"2023-01-25 14:10:00": {
"1. open": "4.9400",
"2. high": "4.9413",
"3. low": "4.9400",
"4. close": "4.9413",
"5. volume": "403"
},
"2023-01-25 14:05:00": {
"1. open": "4.9300",
"2. high": "4.9400",
"3. low": "4.9300",
"4. close": "4.9400",
"5. volume": "586"
},
"2023-01-25 13:55:00": {
"1. open": "4.9400",
"2. high": "4.9400",
"3. low": "4.9400",
"4. close": "4.9400",
"5. volume": "200"
},
"2023-01-25 13:50:00": {
"1. open": "4.9400",
"2. high": "4.9400",
"3. low": "4.9400",
"4. close": "4.9400",
"5. volume": "853"
},
"2023-01-25 13:45:00": {
"1. open": "4.9400",
"2. high": "4.9400",
"3. low": "4.9400",
"4. close": "4.9400",
"5. volume": "101"
},
"2023-01-25 13:40:00": {
"1. open": "4.9400",
"2. high": "4.9400",
"3. low": "4.9400",
"4. close": "4.9400",
"5. volume": "126"
},
"2023-01-25 13:35:00": {
"1. open": "4.9400",
"2. high": "4.9400",
"3. low": "4.9400",
"4. close": "4.9400",
"5. volume": "206"
},
"2023-01-25 13:30:00": {
"1. open": "4.9400",
"2. high": "4.9500",
"3. low": "4.9400",
"4. close": "4.9500",
"5. volume": "301"
},
"2023-01-25 13:25:00": {
"1. open": "4.9500",
"2. high": "4.9500",
"3. low": "4.9500",
"4. close": "4.9500",
"5. volume": "461"
},
"2023-01-25 13:20:00": {
"1. open": "4.9400",
"2. high": "4.9400",
"3. low": "4.9300",
"4. close": "4.9400",
"5. volume": "661"
},
"2023-01-25 13:15:00": {
"1. open": "4.9328",
"2. high": "4.9328",
"3. low": "4.9328",
"4. close": "4.9328",
"5. volume": "100"
}
}
}
The thing is, the first data point you try to get is not on:
jsonDecode(mydata.body)["Time Series (5min)"][0]["1. open"],
but on
jsonDecode(mydata.body)["Time Series (5min)"]["2023-01-26 19:05:00"]["1. open"],
"Time Series (5min)" is not a list but a map.
Because the keys seem to be dynamic dates it's harder to hardcode it, but this might work:
jsonDecode(mydata.body)["Time Series (5min)"].values.toList()[0]["1. open"],
CodePudding user response：
Problem is with your fetch is not successful as it is returing null,
Response mydata = await get(Uri.parse(
"https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY&symbol=$element&interval=5min&apikey=RTILMV6RV0R20DKC"));
Map decodeBodyData = jsonDecode(mydata.body); //