How to Implement Light and Dark Themes in Flutter | Dynamic Theme

How to Implement Light and Dark Themes | Dynamic Theme | Light Mode & Dark Mode in Flutter 🌙☀️

In this tutorial, we’ll learn *how to implement Light and Dark themes in Flutter* to create a modern, user-friendly, and dynamic app experience. Adding *light mode and dark mode* not only enhances user comfort but also improves accessibility and makes your Flutter apps feel more professional.

We’ll walk step by step through **setting up themes in Flutter**, switching between light and dark modes dynamically, and even persisting the user’s choice using local storage. By the end of this guide, you’ll be able to give your users the option to choose their preferred mode—or automatically detect system theme preferences.

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🛠️ *What You’ll Learn in This Tutorial:*

How to define *light and dark themes* in Flutter
Applying *ThemeData* for customizing colors, typography, and widgets
How to *switch between themes dynamically*
Detecting *system theme preferences* (auto dark mode)
Persisting user-selected theme using *SharedPreferences* or *Hive*
Best practices for managing themes in *Flutter projects*
Building a *toggle button* to switch between light and dark mode in real-time

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📌 *Step-by-Step Implementation:*

1. Create a new Flutter project or open an existing one.
2. Define *lightTheme* and *darkTheme* using `ThemeData`.
3. Wrap your app with `MaterialApp` and pass both themes.
4. Use `ThemeMode` to toggle between `ThemeMode.light`, `ThemeMode.dark`, and `ThemeMode.system`.
5. Add a *switch or button* in the UI for users to toggle themes.
6. Save the user’s choice using *SharedPreferences* so it persists on app restart.

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📌 *Example Code Snippet:*

```dart
MaterialApp(
title: 'Flutter Theme Demo',
theme: ThemeData.light(),
darkTheme: ThemeData.dark(),
themeMode: ThemeMode.system, // can be ThemeMode.light or ThemeMode.dark
home: HomePage(),
);
```

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💡 *Pro Tips:*

Customize colors and widgets in your *ThemeData* for a polished design.
Always test your app in both modes to ensure **text visibility and contrast**.
For larger apps, use a *state management solution* (like Provider or Riverpod) to handle theme changes.
Respect the *user’s device preference* by supporting `ThemeMode.system`.

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#Flutter #DarkMode #LightMode #FlutterThemes #DynamicTheme #FlutterUI #FlutterDevelopment #FlutterForBeginners #MobileAppDevelopment #Dart #StateManagement