Sebelumnya baca tutorial : LATIHAN FLUTTER WEEK#1 : MEMECAH KODE

hal_icon.dart

import 'package:flutter/material.dart';

class hal_icon extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Halaman Icon'),
        backgroundColor: Colors.blue[300],
      ),
      body: new Center(
        child: Container(
          color: Colors.blue[900],
          width: 400.0,
          height: 400.0,
          child: new Center(
            child: new Icon(
              Icons.android,
              color: Colors.white,
              size: 80.0,
            ),
          ),
        )
      ),


    );
  }

}