Flutter Themes with Example

Flutter themes allow developers to define a consistent look and feel across their entire application. Themes in Flutter are defined as a collection of properties that are applied to widgets throughout the app, such as colors, fonts, and other visual elements.

In this blog, we will discuss how to use themes in Flutter with an example.

Step 1: Creating a Theme

To create a theme in Flutter, you need to define a ThemeData object. The ThemeData object contains properties such as colors, fonts, and other visual elements that define the look and feel of the app. 

Here is an example of how to create a theme

final ThemeData myTheme = ThemeData(
  primarySwatch: Colors.blue,
  fontFamily: 'Montserrat',
  textTheme: TextTheme(
    headline1: TextStyle(fontSize: 24.0, fontWeight: FontWeight.bold),
    bodyText1: TextStyle(fontSize: 16.0, color: Colors.grey[700]),
    button: TextStyle(fontSize: 18.0, color: Colors.white),
  ),
);​

In this example, we have defined a ThemeData object with a blue primary color, a custom font called Montserrat, and a textTheme object that defines the styles for various text elements in the app.

Step 2: Applying the Theme

To apply the theme to your app, you need to wrap your MaterialApp widget with a Theme widget and set the data property to your ThemeData object.

Here is an example of how to apply the theme:

void main() {
  runApp(
    MaterialApp(
      title: 'My App',
      theme: myTheme,
      home: MyHomePage(),
    ),
  );
}​

In this example, we have wrapped our MaterialApp widget with a Theme widget and set the data property to our ThemeData object called myTheme.

Step 3: Using the Theme

Once you have applied the theme to your app, you can use the properties defined in the theme throughout your app.

For example, you can use the headline1 style that we defined in our textTheme object like this:

Text(
  'My Heading',
  style: Theme.of(context).textTheme.headline1,
),​

In this example, we have used the headline1 style from the textTheme object by calling Theme.of(context).textTheme.headline1. This ensures that the style is consistent with the rest of the app.

Conclusion

we discussed how to use themes in Flutter to define a consistent look and feel across your entire application. We covered the steps for creating a theme, applying the theme to your app, and using the properties defined in the theme. By using themes in Flutter, you can create a professional-looking app with a consistent user interface.