ipondroid

child: RaisedButton(
    child: Text('go to first tab'),
    onPressed: () {
        _tabController.animateTo(0, curve: Curves.ease, duration: Duration(seconds: 2));
    },
),

ipondroid

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
    );

ipondroid

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      initialRoute: '/',
      routes: {
        '/': (BuildContext context) => HomePage(),
        '/page1': (BuildContext context) => Page1(),
        '/page4': (BuildContext context) => Page4(),

ipondroid

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('RichText Widget Demo'),
      ),
      body: Center(
        child: ListView(
          padding: const EdgeInsets.all(20.0),

ipondroid

@override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('RichText Widget Demo'),
      ),
      body: Center(
        child: ListView(
          padding: const EdgeInsets.all(20.0),
          children: <Widget>[

ipondroid

@override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('RichText Widget Demo'),
      ),
      body: Center(
        child: ListView(
          padding: const EdgeInsets.all(20.0),
          children: <Widget>[

ipondroid

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('BottomAppBar demo'),
      ),
      body: Center(
        child: Text('body'),
      ),

ipondroid

class _ClickCounterState extends State<ClickCounter> {
  int _count = 0;
  var keys = [1, 2, 3];
  var colors = [Colors.red, Colors.blue, Colors.green];
  var borderRadius = [50.0, 30.0, 0.0];
  
  Widget createBox(int key) => Container(
    decoration: BoxDecoration(
      color: colors[key],
      borderRadius: BorderRadius.circular(borderRadius[key]),

ipondroid

transitionBuilder: (Widget child, Animation<double> animation) {
    return FadeTransition(opacity: animation, child: child);
}

ipondroid

class _MyHomePageState extends State<MyHomePage> {
  AlertDialog _dialog(String title) {
    return AlertDialog(
      title: Text(title),
      actions: <Widget>[
        FlatButton(
          child: Text('back'),
          onPressed: () {
            Navigator.pop(context);
          },