yahoo_finance_data_reader 0.0.7

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

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:yahoo_finance_data_reader/yahoo_finance_data_reader.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool useProxy = false;
  DateTime? date;

  @override
  Widget build(BuildContext context) {
    String ticker = 'GOOG';
    YahooFinanceDailyReader yahooFinanceDataReader = YahooFinanceDailyReader(
        prefix: useProxy
            ? 'https://thingproxy.freeboard.io/fetch/https://'
            : 'https://');

    Future<List> future;
    if (date == null) {
      future = yahooFinanceDataReader.getDaily(ticker);
    } else {
      future = yahooFinanceDataReader.getDaily(ticker, startDate: date);
    }

    // TODO add DTO to example
    //Future<List<YahooFinanceData>> data =
    //    yahooFinanceDataReader.getDailyDTOs(ticker);

    return MaterialApp(
      title: 'Flutter Demo',
      home: Scaffold(
          appBar: AppBar(
            title: const Text('Example'),
          ),
          body: Column(
            children: [
              CheckboxListTile(
                value: useProxy,
                onChanged: (value) => setState(() => useProxy = !useProxy),
                title: const Text('Use proxy'),
              ),
              CheckboxListTile(
                value: date != null,
                onChanged: (value) => setState(() {
                  if (date == null) {
                    date = DateTime.now();
                  } else {
                    date = null;
                  }
                }),
                title: const Text('Just now data'),
              ),
              Expanded(
                child: Builder(
                  builder: (BuildContext context) => SizedBox(
                    child: FutureBuilder(
                      future: future,
                      builder: (BuildContext context,
                          AsyncSnapshot<List<dynamic>> snapshot) {
                        if (snapshot.connectionState == ConnectionState.done) {
                          List<dynamic> historicalData = snapshot.data!;
                          return ListView.builder(
                              itemCount: historicalData.length + 1,
                              itemBuilder: (BuildContext context, int index) {
                                if (index == 0) {
                                  return Container(
                                    margin: const EdgeInsets.all(10),
                                    child: Text(ticker),
                                  );
                                }

                                Map<String, dynamic> day =
                                    historicalData[index - 1];
                                DateTime date =
                                    DateTime.fromMillisecondsSinceEpoch(
                                        day['date'] * 1000);
                                return Container(
                                    margin: const EdgeInsets.all(10),
                                    child:
                                        Text(generateDescription(date, day)));
                              });
                        } 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']}
''';
  }
}