RafaelBarbosatec

Widget _getListCategory(){

    ListView listCategory = new ListView.builder(
        itemCount: _categorys.length,
        scrollDirection: Axis.horizontal,
        itemBuilder: (context, index){
          return _buildCategoryItem(index);
        }
    );

RafaelBarbosatec

Navigator.push(
    context,
    MaterialPageRoute(builder: (context) => Screen1()),
  );

RafaelBarbosatec

Navigator.of(context).pushNamed('/screen1');

RafaelBarbosatec

return new MaterialApp(
      title: 'Flutter News',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new NoticeList(),
      routes: <String, WidgetBuilder> {
        '/screen1': (BuildContext context) => new Screen1(),
        '/screen2' : (BuildContext context) => new Screen2()
      },

RafaelBarbosatec

import 'dart:async';
import 'dart:convert';
import 'package:http/http.dart' as http;

class NewsApi{

String url = "https://raw.githubusercontent.com/RafaelBarbosatec/tutorial_flutter_medium/master/api/news.json";

  Future <List> loadNews() async{
    // Make a HTTP GET request to the CoinMarketCap API.

RafaelBarbosatec

import 'package:flutter/material.dart';
import 'Notice.dart';
import 'NewsApi.dart';

class NoticeList extends StatefulWidget{

  final state = new _NoticeListPageState();

  @override
  _NoticeListPageState createState() => state;

RafaelBarbosatec

Widget _getBottomNavigationBa() {
  
  return new BottomNavigationBar(
       onTap: onTabTapped, // new
       currentIndex: _currentIndex, // new
       type: BottomNavigationBarType.shifting
       items: [
         new BottomNavigationBarItem(
           icon: const Icon(Icons.home),
           title: Text('Recentes'),

RafaelBarbosatec

void onTabTapped(int index) {
   setState(() {
     _currentIndex = index;
   });
 }

RafaelBarbosatec

Widget _getBottomNavigationBa() {
  
  return new BottomNavigationBar(
       onTap: onTabTapped, // new
       currentIndex: _currentIndex, // new
       items: [
         new BottomNavigationBarItem(
           icon: const Icon(Icons.home),
           title: Text('Recentes'),
           backgroundColor: Colors.blue

RafaelBarbosatec

import 'package:flutter/material.dart';
import 'Notice.dart';
import 'NewsApi.dart';

class NoticeList extends StatefulWidget{

  final state = new _NoticeListPageState();

  @override
  _NoticeListPageState createState() => state;