Day 16: Theme and Styling

Topic: Customizing Themes and Styles

Details: In Flutter, customizing the look and feel of your application is crucial for creating a consistent and visually appealing user experience. Today, we'll explore how to define themes and apply styles to your Flutter app.

What is a Theme?

A theme in Flutter defines the colors, fonts, and other visual aspects of the app. By using themes, you can maintain a consistent look and feel across all the screens and widgets in your application.

Defining a Theme

To define a theme, you need to modify the MaterialApp widget in your main.dart file.

Example: Setting Up a Theme

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Theming Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        accentColor: Colors.orange,
        textTheme: TextTheme(
          bodyText1: TextStyle(fontSize: 18.0, color: Colors.black),
          bodyText2: TextStyle(fontSize: 16.0, color: Colors.black54),
        ),
      ),
      home: HomeScreen(),
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: Text('Hello, Flutter!', style: Theme.of(context).textTheme.bodyText1),
      ),
    );
  }
}        

In this example:

• We define a ThemeData object with a primary color (primarySwatch), an accent color (accentColor), and a custom TextTheme.
• The HomeScreen widget uses the defined theme to style the text.

Using Custom Themes

You can also define custom themes for individual widgets using Theme widget and ThemeData.

Example: Custom Button Theme

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Custom Button Theme',
      theme: ThemeData(
        buttonTheme: ButtonThemeData(
          buttonColor: Colors.blue,
          textTheme: ButtonTextTheme.primary,
        ),
      ),
      home: HomeScreen(),
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () {},
          child: Text('Press Me'),
        ),
      ),
    );
  }
}        

In this example:

• We define a ButtonThemeData within the ThemeData to customize the appearance of buttons.
• The ElevatedButton inherits the theme defined in the ThemeData.

Conclusion

Customizing themes and styles in Flutter allows you to create a cohesive and visually appealing application. By defining and using themes, you can ensure consistency across your app and make future changes easier.

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