Flutter: Making Your Application Support Dark Mode

Of course, we should respect user preferences. If a user sets their OS to Dark Mode, every app should honor that choice. So how can we achieve this in Flutter?

// ...
MaterialApp(
  // ...
  darkTheme: ThemeData.dark()
  // ...
);
// ...

Simply pass the ThemeData you want or have configured into darkTheme, which is one of the attributes of MaterialApp — and the magic happens!