How to use Padding widget in Flutter

In this Google flutter code example we are going to learn how to use Padding widget in Flutter.

You can copy and adopt this source code example to your android project without reinventing the wheel.

The comments on the code provide more detailed explanation

The code is based on flutter version 1 and 2.

Main.dart (App entry point)

import 'package:flutter/material.dart';
import 'padding.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Padding Widget',
      debugShowCheckedModeBanner: false,
      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 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.
      home: BasicPadding(),


import 'package:flutter/material.dart';

class BasicPadding extends StatelessWidget {
  //A widget that insets its child by the given padding.

  //When passing layout constraints to its child, padding shrinks the constraints by the given padding,
  //causing the child to layout at a smaller size. Padding then sizes itself to its child's size, inflated by the
  //padding, effectively creating empty space around the child.

  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("Basic Padding")),
      body: Padding(
        //the EdgeInsets class is used to set padding
        //you can either choose from EdgeInsets.all, EdgeInsets.symmetric, EdgeInsets.only, EdgeInsets.LRTB
        padding: EdgeInsets.all(20.0),
        child: Container(
          height: 40.0,
          width: 40.0,

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