Flutter is a free and open-source mobile UI framework created by Google and released in May 2017. It allows you to create a native mobile application with only one codebase. Its means that you can use only one programming language to create an app for two different platform such as iOS and Android.

In this Article, will share you a simple tutorial of how you can develop a simple Whatsapp UI clone using Flutter. As its only UI, so there is no integrated backend into this but soon will share same Project with Backend Integration.

SOURCE CODE DOWNLOAD For Demo & Source Code Scroll down.

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flutter create whatsapp_ui_clone

This will generate the project files for both Android and IOS

Now that the project has been generated, Checkout into the project folder and run Flutter.

cd whatsapp_ui_clone && Flutter run

By default, Flutter generates a Counter application so if their is no issue while setting up Flutter Environment, you should see this on your device.

Let’s start by importing Flutter’s material package. This package contains a set of pre-made widgets which are designed following Google’s material design guidelines.

import 'package:flutter/material.dart';

Now Flutter Environment has setup now you can move to the development mode. We now move on to the main function. This is the first thing that runs when the app is launched.

In main.dart , we add the lines

void main(){ }

Next, we specify the runApp method inside of main

void main(){ runApp( ); }

Now, we need to specify the MyApp method inside of runApp

void main(){ runApp( MyApp() ); }

Also, you can write above code like this.

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

As we know using OOPS concept is beneficial for every programming laguage same we going to do here, will use OOPS concept to develop this Whatsapp UI clone.

class MyApp extends StatefulWidget{ @override _MyAppState createState() => _MyAppState(); }

In above code, simply we create a class name MyApp where we going to specify our further code. Also used @override method which marks an instance member as overriding a superclass member with the same name. @override just points out that the function is also defined in an ancestor class, but is being redefined to do something else in the current class. It's also used to annotate the implementation of an abstract method. It is optional to use but recommended as it improves readability.

Now, we create a new instance of MaterialApp. This will be the parent widget of our app.

return MaterialApp();

In Flutter, there are two types of widgets, Stateful and Stateless. The above code uses the Stateful variant. As you can see, it is created in three steps. First, on line 1, the class name is defined followed by the keywords Extends StatefulWidget. Then on line two, the state is created. Finally, on line five another class is created, this time using the name used to create the state. This class extends the State.

class MyApp extends StatefulWidget{ @override _MyAppState createState() => _MyAppState(); } class _MyAppState extends State with SingleTickerProviderStateMixin{ TabController controller; @override void initState(){ super.initState(); controller = new TabController(length: 3, vsync: this); }

#With all the components in place, it’s time to look up code structure and look at the results. Back in main.dart, modify the file so that it looks like this.

import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatefulWidget{ @override _MyAppState createState() => _MyAppState(); } class _MyAppState extends State with SingleTickerProviderStateMixin{ TabController controller; @override void initState(){ super.initState(); controller = new TabController(length: 3, vsync: this); } @override Widget build(BuildContext context) { // TODO: implement build return MaterialApp( debugShowCheckedModeBanner: false, home: Scaffold( appBar: AppBar( // backgroundColor: Color.fromARGB(200, 7, 94, 84), backgroundColor: Color.fromRGBO(7, 94, 84, 2), title: Text("WhatsApp"), actions: [ Padding( padding: EdgeInsets.only(right: 15.0), child: Icon(Icons.search), ), Padding( padding: EdgeInsets.only(right: 15.0), child: Icon(Icons.more_vert), ), ], // flexibleSpace: , bottom: TabBar( indicatorColor: Colors.white, controller: controller, tabs: [ GestureDetector( child: Tab( child: Text("CHATS"), ), ), GestureDetector( child: Tab( child: Text("STATUS"), ), ), GestureDetector( child: Tab( child: Text("CALLS"), ), ), ], ), ), body: TabBarView( controller: controller, children: [ Container( child: ListView.builder( itemCount: 10, itemBuilder: (BuildContext context, int i){ return Card( // elevation: 10.0, child: ListTile( contentPadding: EdgeInsets.all(10.0), title: Text("SAMPLE", style: TextStyle( fontWeight: FontWeight.bold, ),), subtitle: Text("Sample message"), leading: CircleAvatar( backgroundColor: Color.fromRGBO(7, 94, 84, 2), // foregroundColor: Colors.pink, child: Icon( Icons.android ), ), trailing: Text("${DateTime.now().hour}" + ":" + "${DateTime.now().second}"), ), ); }, ), ), Container( color: Colors.white, child: Column( children: [ ListTile( leading: CircleAvatar( backgroundColor: Color.fromRGBO(7, 94, 84, 2), child: Icon(Icons.android), ), title: Text("My Status", style: TextStyle(fontWeight: FontWeight.bold),), subtitle: Text("Tap to add status update"), ), Container( height: 25, color: Colors.black12, child: Row( children: [ Padding( padding: EdgeInsets.only(left: 20), ), Text("Recent Updates", textAlign: TextAlign.left), ], ), ), Expanded( child: Container( margin: EdgeInsets.all(0), // height: MediaQuery.of(context).size.height, child: ListView.builder( itemCount: 10, itemBuilder: (context, i){ return Card( child: ListTile( leading: CircleAvatar( backgroundColor: Color.fromRGBO(7, 94, 84, 2), child: Icon(Icons.android), ), contentPadding: EdgeInsets.all(7.0), title: Text("Hey", style: TextStyle(fontWeight: FontWeight.bold)), subtitle: Text("Today ${DateTime.now().hour}" + ":" + "${DateTime.now().minute}" + "pm"), ), ); }, ), ), ), ], ), ), Container( child: ListView.builder( itemCount: 10, itemBuilder: (BuildContext context, int i){ return ListTile( contentPadding: EdgeInsets.all(7.0), leading: CircleAvatar( child: Icon(Icons.android), backgroundColor: Color.fromRGBO(7, 94, 84, 2), ), title: Text("Sample", style: TextStyle(fontWeight: FontWeight.bold)), subtitle: Text("Yesterday, ${DateTime.now().hour}" + ":" + "${DateTime.now().minute}" + "pm"), trailing: Icon(Icons.call, color: Color.fromRGBO(7, 94, 84, 2),), ); }, ), ), ], ), floatingActionButton: FloatingActionButton( child: Icon(Icons.camera_alt), backgroundColor: Color.fromRGBO(7, 94, 84, 2), ), ), ); } }

Here is the video of this app after executing all code need for the development of this Whatsapp UI Clone App

You will get all files, when you download the source code. And after than you can edit it according to you

if you face any issues you can contact by asking question with article link.

You can Download source code for the same & make changes according to you