Question

Rather than declaring a font as part of an app, you can declare a font as part of a separate package. This is a convenient way to share the same font across several different projects, or for coders publishing their packages to the Pub site.

Directions

1. Add a font to a package
2. Add the package and font to the app
3. Use the font

1. Add fonts to a package

To export a font from a package, you need to import the font files into the lib folder of the package project. You can place font files directly in the lib folder or in a subdirectory, such as lib/fonts.

In this example, assume you’ve got a Flutter library called awesome_package with fonts living in a lib/fonts folder.

awesome_package/
  lib/
    awesome_package.dart
    fonts/
      Raleway-Regular.ttf
      Raleway-Italic.ttf

2. Add the package and fonts to the app

You can now consume the package and use the fonts it provides. This involves updating the pubspec.yaml in the app’s root directory.

Add the package to the project

dependencies:
  awesome_package: <latest_version>

Declare the font assets

Now that you’ve imported the package, you need to tell Flutter where to find the fonts from the awesome_package.

To declare package fonts, you must must prefix the path to the font with packages/awesome_package. This tells Flutter to look in the lib folder of the package for the font.

flutter:
  fonts:
    - family: Raleway
      fonts:
        - asset: packages/awesome_package/fonts/Raleway-Regular.ttf
        - asset: packages/awesome_package/fonts/Raleway-Italic.ttf
          style: italic

3. Use the font

You can use a TextStyle to change the appearance of text. To use package fonts, you need to not only declare which font you’d like to use, you need to declare the package the font belongs to.

Text(
  'Using the Raleway font from the awesome_package',
  style: TextStyle(
    fontFamily: 'Raleway',
    package: 'awesome_package',
  ),
);

Complete example

Fonts

The Raleway and RobotoMono fonts were downloaded from Google Fonts.

pubspec.yaml

name: package_fonts
description: An example of how to use package fonts with Flutter

dependencies:
  awesome_package:
  flutter:
    sdk: flutter

dev_dependencies:
  flutter_test:
    sdk: flutter

flutter:
  fonts:
    - family: Raleway
      fonts:
        - asset: packages/awesome_package/fonts/Raleway-Regular.ttf
        - asset: packages/awesome_package/fonts/Raleway-Italic.ttf
          style: italic
  uses-material-design: true

main.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Package Fonts',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      // The AppBar uses the app-default Raleway font.
      appBar: AppBar(title: Text('Package Fonts')),
      body: Center(
        // This Text Widget uses the RobotoMono font.
        child: Text(
          'Using the Raleway font from the awesome_package',
          style: TextStyle(
            fontFamily: 'Raleway',
            package: 'awesome_package',
          ),
        ),
      ),
    );
  }
}