Expanded in Flutter

Expanded widgets are used to expand the children of a row, column, or flex to fill the available space along a particular axis.
This is often used to distribute remaining storage space to the children of a Flex container

Here's a simple example of using a Expanded in Flutter:

File open lib->main.dart file −

import 'package:flutter/material.dart';

void main() {
  runApp(
      MaterialApp(
        home: Scaffold(
          appBar: AppBar(
            title: Text('Expanded Example'),
          ),
          body: MyApp(),
        ),
      )
  );
}

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Container(
          color: Colors.red,
          height: 50,
          alignment: Alignment.center,
          child: Center(
            child: Text("Micro"),
          ),
        ),
        Expanded(
            child: 
            Container(
              alignment: Alignment.center,
              color: Colors.blue,
              child: Text("Expanded Text"),
            )
        ),

        Container(
          color: Colors.yellow,
          height: 50,
          child: Center(
            child: Text("Tutorial"),
          ),
        ),
      ],
    );
  }
}

Open Device Manager, run the emulator, and then run the application. Next, check the working output and check the output you declared in your code.

Output: