Flutter: Custom theme data

main.dart

import 'package:flutter/material.dart';
import 'theme.dart' as Theme;

void main() {
  runApp(
    new MaterialApp(
      title: 'CompanyApp',
      color: Theme.CompanyColors.blue[500],
      theme: Theme.CompanyThemeData,
      home: new Scaffold(
        appBar: new AppBar(
          title: new Text('CompanyApp')
        ),
        body: new Center(
          child: new Container(
            child: new Text('CompanyApp')
          )
        ),
      )
    )
  );
}

theme.dart

/**
 * Creating custom color palettes is part of creating a custom app. The idea is to create
 * your class of custom colors, in this case `CompanyColors` and then create a `ThemeData`
 * object with those colors you just defined.
 *
 * Resource:
 * A good resource would be this website: http://mcg.mbitson.com/
 * You simply need to put in the colour you wish to use, and it will generate all shades
 * for you. Your primary colour will be the `500` value.
 *
 * Colour Creation:
 * In order to create the custom colours you need to create a `Map<int, Color>` object
 * which will have all the shade values. `const Color(0xFF...)` will be how you create
 * the colours. The six character hex code is what follows. If you wanted the colour
 * #114488 or #D39090 as primary colours in your theme, then you would have
 * `const Color(0x114488)` and `const Color(0xD39090)`, respectively.
 *
 * Usage:
 * In order to use this newly created theme or even the colours in it, you would just
 * `import` this file in your project, anywhere you needed it.
 * `import 'path/to/theme.dart';`
 */

import 'package:flutter/material.dart';

final ThemeData CompanyThemeData = new ThemeData(
  brightness: Brightness.light,
  primarySwatch: CompanyColors.blue,
  primaryColor: CompanyColors.blue[500],
  primaryColorBrightness: Brightness.light,
  accentColor: CompanyColors.green[500],
  accentColorBrightness: Brightness.light
);
  
class CompanyColors {
  CompanyColors._(); // this basically makes it so you can instantiate this class
  static const Map<int, Color> blue = const <int, Color> {
    50: const Color(/* some hex code */),
    100: const Color(/* some hex code */),
    200: const Color(/* some hex code */),
    300: const Color(/* some hex code */),
    400: const Color(/* some hex code */),
    500: const Color(/* some hex code */),
    600: const Color(/* some hex code */),
    700: const Color(/* some hex code */),
    800: const Color(/* some hex code */),
    900: const Color(/* some hex code */)
  };
  
  static const Map<int, Color> green = const <int, Color> {
    50: const Color(/* some hex code */),
    100: const Color(/* some hex code */),
    200: const Color(/* some hex code */),
    300: const Color(/* some hex code */),
    400: const Color(/* some hex code */),
    500: const Color(/* some hex code */),
    600: const Color(/* some hex code */),
    700: const Color(/* some hex code */),
    800: const Color(/* some hex code */),
    900: const Color(/* some hex code */)
  };
}