Flutter- Whts-app like 3 tabs.

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(),
);
}
}

class MyHomePage extends StatefulWidget {

@override
_MyHomePageState createState() => new _MyHomePageState();

}

class _MyHomePageState extends State with SingleTickerProviderStateMixin {

TabController _tabController;
void initState() {
_tabController = new TabController(length: 3, vsync: this);
super.initState();
}

@override
Widget build(BuildContext context) {
return new Scaffold(

  appBar: new AppBar(
      title: new Text("WhatsApp", style: TextStyle(color: Colors.white, fontSize: 22.0, fontWeight: FontWeight.w600),),
      actions: <Widget>[

        Padding(
          padding: const EdgeInsets.only(right: 20.0),
          child: Icon(Icons.search),

        ),
        Padding(
          padding: const EdgeInsets.only(right: 16.0),
          child: Icon(Icons.more_vert),
        ),
      ],


  bottom: TabBar(
  tabs: [
    new Tab(icon: new Icon(Icons.chat)),
    new Tab(
      icon: new Icon(Icons.photo_library),
    ),
    new Tab(
      icon: new Icon(Icons.call),
    )
  ], indicatorColor: Colors.white,
  controller: _tabController, 
  ),
  ),


  body: TabBarView(      
  children: [
    Text("Chat Screen", textAlign: TextAlign.center,style: TextStyle( fontSize: 22.0, fontWeight: FontWeight.w600)),
    Text("Status Screen", textAlign: TextAlign.center,style: TextStyle( fontSize: 22.0, fontWeight: FontWeight.w600)),
    Text("Call Screen", textAlign: TextAlign.center,style: TextStyle( fontSize: 22.0, fontWeight: FontWeight.w600)),
  ],
  controller: _tabController,       

  ),

);

}
}