09 Flutter: HTTP requests and Rest API

main.dart

import 'dart:async';
import 'dart:convert'; //it allows us to convert our json to a list

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

void main() {
  runApp(new MaterialApp(
    home: new HomePage()
  ));
}

class HomePage extends StatefulWidget {
  @override
  HomePageState createState() => new HomePageState();
}

class HomePageState extends State<HomePage> {

  //this async func will get data from the internet
  //when our func is done we return a string
  Future<String> getData() async {
    //we have to wait to get the data so we use 'await'
    http.Response response = await http.get(
      //Uri.encodeFull removes all the dashes or extra characters present in our Uri
      Uri.encodeFull("https://jsonplaceholder.typicode.com/posts"),
      headers: {
        //if your api require key then pass your key here as well e.g "key": "my-long-key"
       "Accept": "application/json" 
      }
    );

    //print(response.body);

    List data = JSON.decode(response.body);
    //print(data);
    print(data[1]["title"]); // it will print => title: "qui est esse"
  }

  @override
  Widget build(BuildContext context){
    return new Scaffold(
      appBar: new AppBar(title: new Text("Stateful Widget!"), backgroundColor: Colors.deepOrange),
      body: new Center(
        child: new RaisedButton(
              child: new Text("Get data!", style: new TextStyle(color: Colors.white, fontStyle: FontStyle.italic, fontSize: 20.0)),
              onPressed: getData
        )
      )
    );
  }
}