yahoo_finance_data_reader 1.0.14 
yahoo_finance_data_reader: ^1.0.14 copied to clipboard
Published 40 days ago • 
incaview.com
incaview.comData reader for yahoo finance to get daily stocks prices. It can be used to develop backtests and it can get all the historic daily data on yahoo finance
import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import 'package:intl/intl.dart';
import 'package:yahoo_finance_data_reader/yahoo_finance_data_reader.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
const Color seedColor = Color(0xFF7C4DFF);
return MaterialApp(
theme: ThemeData(
useMaterial3: true,
brightness: Brightness.dark,
colorScheme: ColorScheme.fromSeed(
seedColor: seedColor,
brightness: Brightness.dark,
),
scaffoldBackgroundColor: const Color(0xFF0B0B1B),
cardTheme: CardThemeData(
color: const Color(0xFF181828),
elevation: 4,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(18),
),
),
inputDecorationTheme: InputDecorationTheme(
filled: true,
fillColor: const Color(0xFF121223),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(12),
borderSide: BorderSide.none,
),
),
),
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
home: const BottomSelectionWidget(),
);
}
}
class BottomSelectionWidget extends StatefulWidget {
const BottomSelectionWidget({super.key});
@override
State<BottomSelectionWidget> createState() => _BottomSelectionWidgetState();
}
class _BottomSelectionWidgetState extends State<BottomSelectionWidget> {
int _selectedIndex = 0;
final PageController _pageController = PageController();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
centerTitle: true,
backgroundColor: Colors.transparent,
elevation: 0,
title: const Text('Yahoo Finance Example'),
),
body: Container(
decoration: const BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
colors: [Color(0xFF0E0E1F), Color(0xFF090913)],
),
),
child: SafeArea(
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
child: PageView(
physics: const NeverScrollableScrollPhysics(),
controller: _pageController,
onPageChanged: _onPageChanged,
children: const [
YahooFinanceServiceWidget(),
DTOSearch(),
RawSearch(),
ReaderConfigSearch(),
],
),
),
),
),
bottomNavigationBar: BottomNavigationBar(
onTap: _onItemTapped,
currentIndex: _selectedIndex,
type: BottomNavigationBarType.fixed,
backgroundColor: const Color(0xFF131326),
selectedItemColor: Theme.of(context).colorScheme.secondary,
unselectedItemColor: Colors.white54,
items: const [
BottomNavigationBarItem(
icon: Icon(Icons.storage),
label: 'Service',
),
BottomNavigationBarItem(
icon: Icon(Icons.format_list_numbered),
label: 'DTO',
),
BottomNavigationBarItem(
icon: Icon(Icons.raw_on),
label: 'Raw',
),
BottomNavigationBarItem(
icon: Icon(Icons.tune),
label: 'Reader Config',
),
],
),
);
}
void _onItemTapped(int index) {
setState(() {
_pageController.animateToPage(index,
duration: const Duration(milliseconds: 200), curve: Curves.easeOut);
_selectedIndex = index;
});
}
void _onPageChanged(int index) {
setState(() {
_selectedIndex = index;
});
}
}
class RawSearch extends StatefulWidget {
const RawSearch({
super.key,
});
@override
State<RawSearch> createState() => _RawSearchState();
}
class _RawSearchState extends State<RawSearch> {
@override
Widget build(BuildContext context) {
String ticker = 'SOL-USD';
YahooFinanceDailyReader yahooFinanceDataReader =
const YahooFinanceDailyReader();
Future<Map<String, dynamic>> future =
yahooFinanceDataReader.getDailyData(ticker);
return FutureBuilder(
future: future,
builder:
(BuildContext context, AsyncSnapshot<Map<String, dynamic>> snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.data == null) {
return const Text('No data');
}
Map<String, dynamic> historicalData = snapshot.data!;
return SingleChildScrollView(
child: Card(
child: Padding(
padding: const EdgeInsets.all(16),
child: SelectableText(
historicalData.toString(),
style: const TextStyle(height: 1.4),
),
),
),
);
} else if (snapshot.hasError) {
return Text('Error ${snapshot.error}');
}
return const Center(
child: SizedBox(
height: 50,
width: 50,
child: CircularProgressIndicator(),
),
);
},
);
}
String generateDescription(DateTime date, Map<String, dynamic> day) {
return '''$date
open: ${day['open']}
close: ${day['close']}
high: ${day['high']}
low: ${day['low']}
adjclose: ${day['adjclose']}
''';
}
}
class DTOSearch extends StatefulWidget {
const DTOSearch({super.key});
@override
State<DTOSearch> createState() => _DTOSearchState();
}
class _DTOSearchState extends State<DTOSearch> {
final TextEditingController controller = TextEditingController(
text: 'SOL-USD',
);
late Future<YahooFinanceResponse> future;
@override
void initState() {
super.initState();
load();
}
@override
Widget build(BuildContext context) {
return Column(
children: [
const SizedBox(height: 8),
const Text(
'Ticker from Yahoo Finance',
style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600),
),
const SizedBox(height: 12),
TextField(
controller: controller,
decoration: const InputDecoration(
hintText: 'Example: SOL-USD',
),
),
const SizedBox(height: 12),
MaterialButton(
onPressed: load,
minWidth: 160,
padding: const EdgeInsets.symmetric(vertical: 14),
shape:
RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
child: const Text('Load'),
color: Theme.of(context).colorScheme.primary,
),
const SizedBox(height: 12),
Expanded(
child: FutureBuilder(
future: future,
builder: (BuildContext context,
AsyncSnapshot<YahooFinanceResponse> snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.data == null) {
return const Text('No data');
}
YahooFinanceResponse response = snapshot.data!;
return ListView.builder(
itemCount: response.candlesData.length,
itemBuilder: (BuildContext context, int index) {
YahooFinanceCandleData candle =
response.candlesData[index];
return _CandleCard(candle);
});
} else {
return const Center(
child: SizedBox(
height: 50,
width: 50,
child: CircularProgressIndicator(),
),
);
}
},
),
),
],
);
}
void load() {
try {
future = const YahooFinanceDailyReader().getDailyDTOs(controller.text);
} catch (e) {
debugPrint('Error: $e');
// Show snackbar with error
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Error: $e'),
),
);
}
setState(() {});
}
}
class _CandleCard extends StatelessWidget {
final YahooFinanceCandleData candle;
const _CandleCard(this.candle);
@override
Widget build(BuildContext context) {
final String date = candle.date.toIso8601String().split('T').first;
return Card(
child: Container(
margin: const EdgeInsets.all(8),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Text(
date,
style: const TextStyle(
fontSize: 16,
fontWeight: FontWeight.w600,
),
),
],
),
const SizedBox(
height: 10,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Text('open: ${candle.open.toStringAsFixed(2)}'),
Text('close: ${candle.close.toStringAsFixed(2)}'),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Text('low: ${candle.low.toStringAsFixed(2)}'),
Text('high: ${candle.high.toStringAsFixed(2)}'),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Text('volume: ${candle.volume}'),
Text('adjclose: ${candle.adjClose.toStringAsFixed(2)}'),
],
),
],
),
),
);
}
}
class YahooFinanceServiceWidget extends StatefulWidget {
const YahooFinanceServiceWidget({super.key});
@override
State<YahooFinanceServiceWidget> createState() =>
_YahooFinanceServiceWidgetState();
}
class _YahooFinanceServiceWidgetState extends State<YahooFinanceServiceWidget> {
TextEditingController controller = TextEditingController(
text: 'SOL-USD',
);
List<YahooFinanceCandleData> pricesList = [];
List? cachedPrices;
bool loading = true;
bool adjust = true;
DateTime? startDate;
@override
void initState() {
super.initState();
load();
}
void load() async {
loading = true;
setState(() {});
try {
// Get response for the first time
pricesList = await YahooFinanceService().getTickerData(
controller.text,
startDate: startDate,
adjust: adjust,
);
} catch (e) {
debugPrint('Error: $e');
// Show snackbar with error
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Error: $e'),
),
);
}
loading = false;
setState(() {});
}
void deleteCache() async {
loading = true;
setState(() {});
try {
await YahooFinanceDAO().removeDailyData(controller.text);
cachedPrices = await YahooFinanceDAO().getAllDailyData(controller.text);
} catch (e) {
debugPrint('Error: $e');
// Show snackbar with error
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Error: $e'),
),
);
}
loading = false;
setState(() {});
}
void refresh() async {
cachedPrices = await YahooFinanceDAO().getAllDailyData(controller.text);
setState(() {});
}
@override
Widget build(BuildContext context) {
if (loading) {
return const Center(
child: CircularProgressIndicator(),
);
}
return ListView.builder(
itemCount: pricesList.length + 1,
itemBuilder: (context, i) {
if (i == 0) {
final List<String> tickerOptions = [
'SOL-USD',
'GOOG',
'ES=F',
'GC=F',
'ES=F-0.5, GC=F-0.5',
'ES=F, GC=F',
'GOOG, AAPL',
'AAPL',
'AMZN',
'BTC-USD',
];
return Card(
child: Container(
margin: const EdgeInsets.all(10),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Row(
children: tickerOptions
.map(
(option) => Container(
margin: const EdgeInsets.all(5),
child: FilledButton.tonal(
style: FilledButton.styleFrom(
disabledBackgroundColor:
Theme.of(context).colorScheme.primary,
disabledForegroundColor: Colors.white,
),
child: Text(option),
onPressed: controller.text == option
? null
: () {
setState(() {
controller.text = option;
});
load();
},
),
),
)
.toList(),
),
),
const SizedBox(height: 8),
SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Row(
children: [
Text(
startDate != null
? 'Selected Date:\n ${DateFormat('yyyy-MM-dd').format(startDate!)}'
: 'No Date Selected',
style: const TextStyle(fontWeight: FontWeight.w500),
),
TextButton(
onPressed: () async {
DateTime? picked = await showDatePicker(
context: context,
initialDate: startDate ?? DateTime.now(),
firstDate: DateTime(2000),
lastDate: DateTime(2101),
);
if (picked != null && picked != startDate) {
setState(() {
startDate = picked;
});
}
},
child: const Text(
'Select Date',
),
),
],
),
),
CheckboxListTile(
title: const Text('Adjust'),
value: adjust,
onChanged: (value) =>
setState(() => adjust = value ?? false),
),
const Text('Ticker from yahoo finance:'),
TextField(
controller: controller,
decoration: const InputDecoration(
hintText: 'Enter ticker',
),
),
const SizedBox(height: 12),
Wrap(
spacing: 10,
runSpacing: 10,
children: [
FilledButton(
onPressed: load,
child: const Text('Load'),
),
FilledButton.tonal(
onPressed: deleteCache,
child: const Text('Delete Cache'),
),
OutlinedButton(
onPressed: refresh,
child: const Text('Refresh'),
),
],
),
const Divider(height: 24),
if (pricesList.isNotEmpty)
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('Prices in the service ${pricesList.length}'),
Text('First date: ${pricesList.first.date}'),
Text('First price: ${pricesList.first.adjClose}'),
Text('Last date: ${pricesList.last.date}'),
Text('Last price: ${pricesList.last.adjClose}'),
Text(
'Variation: ${((pricesList.last.adjClose / pricesList.first.adjClose - 1) * 100).toStringAsFixed(2)} %'),
],
),
Text('Prices in the cache ${cachedPrices?.length}'),
pricesList.isEmpty
? const Text('No data')
: const SizedBox.shrink()
],
),
),
);
} else {
final YahooFinanceCandleData candleData = pricesList[i - 1];
return _CandleCard(
candleData,
);
}
},
);
}
}
class ReaderConfigSearch extends StatefulWidget {
const ReaderConfigSearch({super.key});
@override
State<ReaderConfigSearch> createState() => _ReaderConfigSearchState();
}
class _ReaderConfigSearchState extends State<ReaderConfigSearch> {
final TextEditingController tickerController = TextEditingController(
text: 'GOOG',
);
final TextEditingController timeoutController = TextEditingController(
text: '30',
);
final TextEditingController headerKeyController = TextEditingController(
text: 'x-example-header',
);
final TextEditingController headerValueController = TextEditingController(
text: 'reader-example',
);
bool useCustomDio = false;
bool adjust = false;
DateTime? startDate;
late Future<YahooFinanceResponse> future;
@override
void initState() {
super.initState();
load();
}
@override
Widget build(BuildContext context) {
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const Text(
'Test YahooFinanceDailyReader with custom Dio and all reader configs.',
style: TextStyle(fontSize: 16),
),
const SizedBox(height: 8),
TextField(
controller: tickerController,
decoration: const InputDecoration(
labelText: 'Ticker',
),
),
const SizedBox(height: 8),
TextField(
controller: timeoutController,
keyboardType: TextInputType.number,
decoration: const InputDecoration(
labelText: 'Timeout (seconds)',
),
),
const SizedBox(height: 8),
TextField(
controller: headerKeyController,
decoration: const InputDecoration(
labelText: 'Custom header key',
),
),
const SizedBox(height: 8),
TextField(
controller: headerValueController,
decoration: const InputDecoration(
labelText: 'Custom header value',
),
),
CheckboxListTile(
title: const Text('Use custom Dio with log interceptor'),
value: useCustomDio,
onChanged: (value) => setState(() => useCustomDio = value ?? false),
),
CheckboxListTile(
title: const Text('Adjust prices'),
value: adjust,
onChanged: (value) => setState(() => adjust = value ?? false),
),
Wrap(
spacing: 10,
runSpacing: 4,
crossAxisAlignment: WrapCrossAlignment.center,
children: [
Text(
startDate != null
? 'Start date: ${DateFormat('yyyy-MM-dd').format(startDate!)}'
: 'Start date: all available history',
style: const TextStyle(fontWeight: FontWeight.w500),
),
FilledButton.tonal(
onPressed: () async {
DateTime? picked = await showDatePicker(
context: context,
initialDate: startDate ?? DateTime.now(),
firstDate: DateTime(1900),
lastDate: DateTime(2101),
);
if (picked != null && picked != startDate) {
setState(() => startDate = picked);
}
},
child: const Text('Pick start date'),
),
TextButton(
onPressed: () => setState(() => startDate = null),
child: const Text('Clear'),
),
],
),
const SizedBox(height: 10),
FilledButton(
onPressed: load,
child: const Text('Load with config'),
),
const SizedBox(height: 10),
Expanded(
child: FutureBuilder(
future: future,
builder: (BuildContext context,
AsyncSnapshot<YahooFinanceResponse> snapshot) {
if (snapshot.connectionState != ConnectionState.done) {
return const Center(
child: CircularProgressIndicator(),
);
}
if (snapshot.hasError) {
return Text('Error: ${snapshot.error}');
}
final YahooFinanceResponse? response = snapshot.data;
if (response == null || response.candlesData.isEmpty) {
return const Text('No data');
}
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('Loaded candles: ${response.candlesData.length}'),
Text('First date: ${response.candlesData.first.date}'),
Text('Last date: ${response.candlesData.last.date}'),
Expanded(
child: ListView.builder(
itemCount: response.candlesData.length.clamp(0, 30),
itemBuilder: (BuildContext context, int index) {
return _CandleCard(response.candlesData[index]);
},
),
),
],
);
},
),
),
],
);
}
void load() {
try {
final int timeoutSeconds =
int.tryParse(timeoutController.text.trim()) ?? 30;
final Map<String, dynamic> requestHeaders = {
'content-type': 'application/json',
'charset': 'utf-8',
'Access-Control-Allow-Origin': '*',
};
final String customHeaderKey = headerKeyController.text.trim();
if (customHeaderKey.isNotEmpty) {
requestHeaders[customHeaderKey] = headerValueController.text.trim();
}
Dio? customDio;
if (useCustomDio) {
customDio = Dio()
..interceptors.add(
LogInterceptor(
requestBody: false,
responseBody: false,
),
);
}
final YahooFinanceDailyReader reader = YahooFinanceDailyReader(
timeout: Duration(seconds: timeoutSeconds),
headers: requestHeaders,
dio: customDio,
);
future = reader.getDailyDTOs(
tickerController.text.trim(),
startDate: startDate,
adjust: adjust,
);
} catch (e) {
future = Future.error(e);
}
setState(() {});
}
}Metadata
30
likes
160
points
558
downloads
Documentation
Publisher
Weekly Downloads
Metadata
Data reader for yahoo finance to get daily stocks prices. It can be used to develop backtests and it can get all the historic daily data on yahoo finance
Homepage
Repository (GitHub)
View/report issues
License
Apache-2.0 (license)
Dependencies
dio, flutter, path, path_provider, sembast, sembast_web
