What is Container ?

• A Container is a Box. You can specify height , width , color , margin and padding etc. and in the below example.

• EdgeInsets.all means all direction (top , bottom , left , right).

Example :

import 'package:flutter/material.dart';

class One extends StatefulWidget {
  const One({super.key});

  @override
  State<One> createState() => _OneState();
}

class _OneState extends State<One> {
  @override
  Widget build(BuildContext context) {
    int num = 0;

    return Scaffold(
      appBar: AppBar(
        title: const Text('Scaffold Class'),
        backgroundColor: Colors.amber,
      ),
      drawer: Drawer(
        child: ListView(
          padding: const EdgeInsets.all(1),
          children: <Widget>[
            Container(
              height: 50,
              color: Colors.blue,
            ),
            Container(
              height: 200,
              width: 200,
              color: Colors.blue,
              child: const Padding(
                padding: EdgeInsets.only(left: 7),
                child: Text(
                  'Scaffold Menu',
                  style: TextStyle(fontSize: 22),
                ),
              ),
            ),
            ListTile(
              title: const Text('Profile'),
              onTap: () {},
              leading: const Icon(Icons.person),
            ),
            ListTile(
              title: const Text('Search'),
              onTap: () {},
              leading: const Icon(Icons.search),
            ),
            ListTile(
              title: const Text('Setting'),
              onTap: () {},
              leading: const Icon(Icons.settings),
            ),
          ],
        ),
      ),
      body: Container(
        alignment: Alignment.center,
        height: double.infinity,
        width: double.infinity,
        color: Colors.lightBlueAccent,
        child: const Text(
          'Scaffold Class One! ',
          style: TextStyle(fontSize: 25),
          textAlign: TextAlign.center,
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          num++;
          print(num);
        },
        shape: const CircleBorder(),
        child: const Icon(Icons.add),
      ),
      bottomNavigationBar: BottomNavigationBar(items: const [
        BottomNavigationBarItem(icon: Icon(Icons.person), label: 'Profile'),
        BottomNavigationBarItem(icon: Icon(Icons.search), label: 'Search'),
        BottomNavigationBarItem(icon: Icon(Icons.settings), label: 'Settings'),
      ]),
    );
  }
}

Output :

•