btc value fetcher

home.dart

import 'dart:convert';
import 'dart:ffi';

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;

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

  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {

  late String btcResponse;

  Future<Map> makeCall() async {
    const String url = "https://blockchain.info/ticker";
    http.Response response = await http.get(Uri.parse(url));
    return json.decode(response.body);
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<Map>(builder: (context, snapshot) {
      Widget futureChild;
      if (snapshot.hasData) {
        double value = snapshot.data!["BRL"]["buy"];
        futureChild = Text("BTC value in BRL is $value");
      } else if (snapshot.hasError) {
        futureChild = Text("Error has occured: ${snapshot.error}");
      } else {
        // waiting for data still
        print("waiting data");
        futureChild = const CircularProgressIndicator();
      }
      return Center(child: Scaffold(
        appBar: AppBar(title: Text("App"), backgroundColor: Colors.deepPurple,),
        body: Center(
            child: Padding(
              child: SingleChildScrollView(child: futureChild),
              padding: EdgeInsets.only(top: 60, bottom: 60),
            )
        ),
      ));
    }, future: makeCall());
  }
}