Flutter加密货币数据获取插件coingecko_dart的使用
Flutter加密货币数据获取插件coingecko_dart的使用
coingecko_dart
A Dart/Flutter Wrapper for the CoinGecko API (V3).
GET STARTED
ADD DEPENDENCY
dependencies:
coingecko_dart: ^0.1.0
EASY TO USE
To get started with the api, all you have to do is initialize it like so and call the method of your choice!
CoinGeckoApi apiInstance = CoinGeckoApi();
//Future<CoinGeckoResult> result = await apiInstance.callMethod();
METHODS AVAILABLE
GENERAL
ping() -> /ping
Example
Future<CoinGeckoResult<bool>> pingResponse = await apiInstance.ping();
bool requestIsSuccessful = pingResponse.data;
SIMPLE
- simplePrice() -> /simple/price
- simpleTokenPrice() -> /simple/token_price/{id}
- simpleSupportedVsCurrencies() -> /simple/supported_vs_currencies
RETURN TYPES
respectively matching the above methods
CoinGeckoResult<List<PricedCoin>>CoinGeckoResult<List<SimpleToken>>CoinGeckoResult<List<String>>
Example
// Obtain prices and some other data of "iota" coin in "jpy" and "usd"
CoinGeckoResult<List<PricedCoin>> result = await apiInstance.simplePrice(
ids: ["iota"],
vs_currencies: ["usd", "jpy"],
includeLastUpdatedAt: true,
includeMarketCap: true,
);
You can use var to store the result if you’re not too sure about the return data type.
// Obtain price and some other data of ethereum token "AAVE" in 'inr','usd' and 'eth'
var result = await apiInstance.simpleTokenPrice(
id: 'ethereum',
contractAddresses: ['0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9'],
vs_currencies: ['inr', 'usd', 'eth'],
);
// List of currencies against crypto ex: ['usd','inr','jpy','cad']
var result = await apiInstance.simpleSupportedVsCurrencies();
COINS
1. listCoins() -> /coins/list
2. getCoinMarkets() -> /coins/markets
3. getCoinData() -> /coins/{id}
4. getCoinTickers() -> /coins/{id}/tickers
5. getCoinHistory() -> /coins/{id}/history
6. getCoinMarketChart() -> /coins/{id}/market_chart
7. getCoinMarketChartRanged() -> /coins/{id}/market_chart/range
RETURN TYPES
respectively matching the above methods
CoinGeckoResult<List<Coin>>CoinGeckoResult<List<FullCoin>>- **
CoinGeckoResult<Coin>** CoinGeckoResult<List<CoinTicker>>- **
CoinGeckoResult<Coin>** CoinGeckoResult<List<CoinDataPoint>>CoinGeckoResult<List<CoinDataPoint>>
** (3,5) Note: Data class is not fully implemented, use (coin.json[]) property instead to access the object directly.
Example
// Obtain a list of Coin() objects
var result = await apiInstance.listCoins(includePlatformFlag: false);
print(result.data.any((element) => element.symbol.toUpperCase() == "BTC")); // true
// Obtain a list of FullCoin() objects
var result = await apiInstance.getCoinMarkets(
vsCurrency: 'usd',
coinIds: ['bitcoin', 'iota', 'tether'],
category: CoinCategories.STABLECOIN,
sparkline: true,
priceChangePercentage: [MarketInterval.T_1H, MarketInterval.T_24H],
);
if (!result.isError) {
print(result.data.id[0] == "tether"); // true
} else {
print("${result.errorCode}, ${result.errorMessage}");
}
// Obtain all data of crypto with id 'bitcoin' with localization and sparkline 7 days data
var result = await apiInstance.getCoinData(
id: 'bitcoin',
localization: true,
sparkline: true,
);
print(result.data.json['block_time_in_minutes'] == 10); // true
// Obtain tickers of crypto 'bitcoin'
var result = await apiInstance.getCoinTickers(
id: "bitcoin",
includeExchangeLogo: true,
);
// result.data is a list that contains instances of `CoinTicker`
// Obtain full data of bitcoin on 2nd April 2019
var result = await apiInstance.getCoinHistory(
id: 'bitcoin',
date: DateTime(2019, 4, 2),
);
print(result.data.json['market_data']['current_price']['usd'] == 4146.321927706636); // true
// A list of CoinDataPoint instances from 30 days back until now, one data point a day
var result = await apiInstance.getCoinMarketChart(
id: "bitcoin",
vsCurrency: "usd",
days: 30,
interval: ChartTimeInterval.DAILY,
);
// A list of CoinDataPoint instances between from Date and to Date
var result = await apiInstance.getCoinMarketChartRanged(
id: "bitcoin",
vsCurrency: "usd",
from: DateTime(2021, 4, 2),
to: DateTime(2021, 4, 10),
);
CONTRACT
getContractTokenData() -> /coins/{id}/contract/{contract_address}
getContractMarketChart() -> /coins/{id}/contract/{contract_address}/market_chart
getContractMarketChartRanged() -> /coins/{id}/contract/{contract_address}/market_chart/range
EXCHANGES
getExchanges() -> /exchanges
getExchangeRatesBtc() -> /exchange_rates
TRENDING
getSearchTrending() -> /search/trending
GLOBAL
getGlobalCoins() -> /global
getGlobalDefi() -> /global/decentralized_finance_defi
更多关于Flutter加密货币数据获取插件coingecko_dart的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
1 回复
更多关于Flutter加密货币数据获取插件coingecko_dart的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然，以下是一个关于如何使用coingecko_dart插件来获取加密货币数据的Flutter代码示例。这个插件允许你访问CoinGecko API，从而获取各种加密货币的数据。
首先，确保在你的pubspec.yaml文件中添加coingecko_dart依赖：
dependencies:
flutter:
sdk: flutter
coingecko_dart: ^最新版本号 # 请替换为最新的版本号
然后运行flutter pub get来安装依赖。
接下来，我们编写一个简单的Flutter应用来展示如何使用这个插件。
import 'package:flutter/material.dart';
import 'package:coingecko_dart/coingecko_dart.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
late CoinGeckoClient _coinGeckoClient;
late Future<Map<String, dynamic>> _coinDataFuture;
@override
void initState() {
super.initState();
_coinGeckoClient = CoinGeckoClient();
_coinDataFuture = _fetchCoinData('bitcoin'); // 例如获取比特币数据
}
Future<Map<String, dynamic>> _fetchCoinData(String coinId) async {
try {
final response = await _coinGeckoClient.getCoins(coinIds: [coinId]);
return response?.data?[0]; // 返回第一个匹配的结果
} catch (e) {
print('Error fetching coin data: $e');
return {};
}
}
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'CoinGecko Data Fetcher',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
appBar: AppBar(
title: Text('CoinGecko Data Fetcher'),
),
body: Center(
child: FutureBuilder<Map<String, dynamic>>(
future: _coinDataFuture,
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.hasError) {
return Text('Error: ${snapshot.error}');
} else if (snapshot.data?.isEmpty ?? true) {
return Text('No data found');
} else {
final coinData = snapshot.data!;
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('Name: ${coinData['name']}'),
Text('Symbol: ${coinData['symbol']}'),
Text('Market Cap: ${coinData['market_cap']['usd']} USD'),
Text('Price: ${coinData['current_price']['usd']} USD'),
],
);
}
} else {
return CircularProgressIndicator();
}
},
),
),
),
);
}
}
在这个示例中，我们做了以下几件事：
- 创建并初始化
CoinGeckoClient实例：这个实例将用于与CoinGecko API进行通信。 - 定义
_fetchCoinData方法：该方法使用_coinGeckoClient来获取指定加密货币的数据。在这个例子中，我们获取的是比特币的数据。 - 使用
FutureBuilder来显示数据：FutureBuilder允许我们根据异步操作（在这个例子中是获取加密货币数据）的状态来构建UI。如果操作完成并且没有错误，它将显示获取到的数据；否则，它将显示一个加载指示器或错误信息。
运行这个应用，你应该能够看到比特币的一些基本信息，如名称、符号、市值和当前价格。
请注意，这个示例仅展示了如何获取单个加密货币的数据。coingecko_dart插件还支持许多其他功能，如获取市场趋势、交易对信息等，你可以查阅其官方文档以获取更多信息。
