How to use Container widget in Flutter

In this Google flutter code example we are going to learn how to use Container 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 provides more detailed explanation

The code is based on flutter version 1 and 2.

Main.dart (App entry point)

import 'package:flutter/material.dart';
import 'container.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 Demo',
      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: BasicContainer(),


import 'package:flutter/material.dart';

class BasicContainer extends StatelessWidget {
  //A convenience widget that combines common painting, positioning, and sizing widgets.
  //contains properties that we can add alignment, padding, margin, transforms, box decoration, set height & width etc
  Widget build(BuildContext context) {
    //a Container widget surrounded by a Center widget
    return Center(
        child: Container(
      //set alignment here

      padding: EdgeInsets.all(5.0),
      //set height & width
      height: 50.0,
      width: 50.0,
      decoration: BoxDecoration(
          //specify color of container
          //set container border
          border: Border.all(
              color:, style: BorderStyle.solid, width: 2.0)),

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