Music Player: Light and Dark

Part of the Layout That Fits section of Coddy's Flutter journey. Lesson 30 of 30.

People listen to music at night, so the player gets a dark mode, with a button in the top bar to switch it.

An AppBar takes actions:, a list of buttons shown at its right end. One IconButton there flips a bool in state, and themeMode: follows it. The button's icon says what it does: a moon, Icons.dark_mode, while the player is light, and a sun, Icons.light_mode, while it is dark.

Every color on the screen that comes from the theme changes with it: the background, the text, the slider and the buttons. The album art keeps its own color, as a picture would.

Challenge

Easy

Add dark mode:

a field bool _dark = false;
a darkTheme: from the seed Colors.deepPurple with brightness: Brightness.dark, and themeMode: chosen by _dark
in the AppBar's actions:, an IconButton showing Icons.light_mode while dark and Icons.dark_mode while light, which flips _dark in setState

Try it yourself

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  double _position = 0.3;
  bool _playing = false;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
      ),
      home: Scaffold(
        appBar: AppBar(title: const Text('Now Playing')),
        body: Padding(
          padding: const EdgeInsets.all(24),
          child: Column(
            children: [
              Stack(
                children: [
                  Container(
                    width: double.infinity,
                    height: 300,
                    decoration: BoxDecoration(
                      color: Colors.deepPurple,
                      borderRadius: BorderRadius.circular(24),
                    ),
                    child: const Center(
                      child: Icon(Icons.album, size: 120, color: Colors.white),
                    ),
                  ),
                  Positioned(
                    top: 12,
                    right: 12,
                    child: Container(
                      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                      decoration: BoxDecoration(
                        color: Colors.black54,
                        borderRadius: BorderRadius.circular(8),
                      ),
                      child: const Text(
                        'HD',
                        style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
                      ),
                    ),
                  ),
                ],
              ),
              const SizedBox(height: 24),
              const Text(
                'Midnight Drive',
                style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 4),
              const Text('The Night Owls', style: TextStyle(color: Colors.grey)),
              const SizedBox(height: 16),
              Slider(
                value: _position,
                onChanged: (value) {
                  setState(() {
                    _position = value;
                  });
                },
              ),
              const Row(
                children: [
                  Text('1:12'),
                  Spacer(),
                  Text('3:45'),
                ],
              ),
              const SizedBox(height: 16),
              Row(
                children: [
                  Expanded(
                    child: IconButton(
                      iconSize: 40,
                      icon: const Icon(Icons.skip_previous),
                      onPressed: () {},
                    ),
                  ),
                  Expanded(
                    child: IconButton(
                      iconSize: 64,
                      icon: Icon(_playing ? Icons.pause : Icons.play_arrow),
                      onPressed: () {
                        setState(() {
                          _playing = !_playing;
                        });
                      },
                    ),
                  ),
                  Expanded(
                    child: IconButton(
                      iconSize: 40,
                      icon: const Icon(Icons.skip_next),
                      onPressed: () {},
                    ),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}