Flutter Tutorial Day 1

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Learning Objective: Let’s start Cross Platform App Development using Flutter. What is Flutter, What is Dart? Flutter Configuration in Android Studio, Hello World Example.

What is Flutter?

Flutter is an open-source UI software development kit created by Google. It is used to develop cross platform applications for Android, iOS, Linux, macOS, Windows, Google Fuchsia, and the web from a single codebase.  Wikipedia

What is Dart?

Flutter is an open-source UI software development kit created by Google. It is used to develop cross platform applications for Android, iOS, Linux, macOS, Windows, Google Fuchsia, and the web from a single codebase.  Wikipedia

Hello World Using Dart

void main() { 
   print("Hello World!"); 
}

Want to Practice Dart Online? https://dartpad.dev/

Download and Install Flutter SDK

https://docs.flutter.dev/get-started/install/windows

Extract SDK into e:\fluttersdk

Set “e:\fluttersdk;” path into your system variable (my computer right click > property > environment variable > system variables > path [edit] )

Now open the command prompt ( Window + R > cmd ) and execute the following command

flutter doctor

Install Android Studio

Android Studio is the official integrated development environment for Google’s Android operating system, built on JetBrains’ IntelliJ IDEA software and designed specifically for Android development. You can use the Flutter plugin in android studio to develop an app using flutter. Download Now

In Android Studio, go to Preferences > Plugins Select and install the following plugin

  • Flutter
  • Dart

Restart Android Studio

Start Android Studio

Create Flutter Project

in lib/main.dart file you will find following code:

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

Run the project in the browser to test it. Output will be as follow:

Now Try following Widgets Step by Step:

  • Text Widget
  • Apply Text Style
  • Center Widget
  • Row Widget
  • Expanded Widget
  • Column Widget
  • Container Widget
  • ListView Widget
  • MaterialApp Widget
  • Scaffold Widget
  • AppBar Widget
  • Image Widget
  • GridView Widget
  • Stack Widget
  • ListTile Widget
  • Icon Widget
  • Card Widget
  • SizedBox Widget
  • Divider Widget
import 'package:flutter/material.dart';

void main() {
  runApp(
    Text("Hello",textDirection: TextDirection.ltr,)
  );
}
Text("Hello",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), )
    Center(
      child: Text("Hello",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), )
    )

Flutter Row Widget Example

Row(
      textDirection: TextDirection.ltr,
      children: [
        Text("Hello",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), ),
        Text("How",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), ),
        Text("Are",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), ),
        Text("You",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), )
      ],
    )

Expanded

Row(
      textDirection: TextDirection.ltr,
      children: [
        Expanded(child: Text("Hello Adarsh Patel",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), )
        ),
        Text("How",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), ),
        Text("Are",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), ),
        Text("You",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), )
      ],
    )
Column(
      textDirection: TextDirection.ltr,
      children: [
        Text("Hello",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), ),
        Text("How",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), ),
        Text("Are",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), ),
        Text("You",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), )
      ],
    )
 Column(
      textDirection: TextDirection.ltr,
      children:  [
        Expanded(child: Text("Hello Adarsh Patel",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), )
        ),
        Expanded(child: Text("How",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), ) ),
        Expanded(child: Text("Are",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), )),
        Expanded(child: Text("You",textDirection: TextDirection.ltr, style: TextStyle(color:Colors.red, fontSize: 50.0), ))
      ],
    )

Container

Container(
      height: 100,
      width: double.infinity,
      //color: Colors.purple,
      alignment: Alignment.center,
      margin: const EdgeInsets.all(20),
      padding: const EdgeInsets.all(30),
      decoration: BoxDecoration(
        color: Colors.blueAccent,
        border: Border.all(color: Colors.black, width: 1)
      ),
      child: const Text("Hello", textDirection: TextDirection.ltr,
          style: TextStyle(fontSize: 20)),
    ),

void main() {
  runApp(
    MaterialApp(
      title: "Title",
      home: Scaffold(
        appBar: AppBar(
          title: Text("My App" ,textDirection: TextDirection.ltr, ) ,
        ),
        backgroundColor: Colors.blueAccent,
        body: Center(
          child: Text("Hello",textDirection: TextDirection.ltr, style: TextStyle(color: Colors.white, decoration: TextDecoration.none  ), ),
        )

      )
    )
  );
}
import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      title: "Title",
      home: Scaffold(
        appBar: AppBar(
          title: Text("My App" ,textDirection: TextDirection.ltr, ) ,
        ),
        backgroundColor: Colors.blueAccent,
        body: Image(
          image: AssetImage('images/owl-2.jpg'),
        )

      )
    )
  );
}
void main() {
  runApp(
    MaterialApp(
      title: "Title",
      home: Scaffold(
        appBar: AppBar(
          title: Text("My App" ,textDirection: TextDirection.ltr, ) ,
        ),
        backgroundColor: Colors.blueAccent,
        body: GridView.extent(maxCrossAxisExtent: 200,
        children: [
          Image(image: AssetImage('images/owl-2.jpg'),),
          Text("Hello",textDirection: TextDirection.ltr,),
          Image(image: AssetImage('images/owl-2.jpg'),),
          Text("Hello",textDirection: TextDirection.ltr,),
          Image(image: AssetImage('images/owl-2.jpg'),),
          Text("Hello",textDirection: TextDirection.ltr,),
        ],
        )

      )
    )
  );
}
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