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README.md

Android DownloadableFonts Sample

This sample demonstrates how to use the Downloadable Fonts feature introduced in Android O. Downloadable Fonts is a feature that allows apps to request a certain font from a provider instead of bundling it or downloading it themselves. This means, there is no need to bundle the font as an asset.

Introduction

There are two ways of requesting a font to download. To request a font to download from Java code, you need to create a FontRequest class first like this:

FontRequest request = new FontRequest(
    "com.google.android.gms.fonts", // ProviderAuthority
    "com.google.android.gms",  // ProviderPackage
    query,  // Query
    R.array.com_google_android_gms_fonts_certs); // Certificates

The parameters ProviderAuthority, ProviderPackage are given by a font provider, in the case above uses Google Play Services as a font provider. The third parameter is a query string about the requested font. The syntax of the query is defined by the font provider.

Then pass the request instance to the requestFont method in the FontsContractCompat.

FontsContractCompat.requestFont(context, request, callback, handler);

The downloaded font or an error code if the request failed will be passed to the callback. The example above assumes you are using the classes from the support library. There are corresponding classes in the framework, but the feature is available back to API level 14 if you use the support library.

You can declare a downloaded font in an XML file and let the system download it for you and use it in layouts.

<font-family xmlns:app="http://schemas.android.com/apk/res-auto"
        app:fontProviderAuthority="com.google.android.gms.fonts"
        app:fontProviderPackage="com.google.android.gms"
        app:fontProviderQuery="Lobster Two"
        app:fontProviderCerts="@array/com_google_android_gms_fonts_certs">
</font-family>

By defining the requested font in an XML file and putting the preloaded_fonts array and the meta-data tag in the AndroidManifest, you can avoid the delay until the font is downloaded by the first attempt.

<resources>
    <array name="preloaded_fonts" translatable="false">
        <item>@font/lobster_two</item>
    </array>
</resources>
<application >
    ...
    <meta-data android:name="preloaded_fonts" android:resource="@array/preloaded_fonts" />
    ...
</application>

Pre-requisites

  • Android SDK 28
  • Android Build Tools v28.0.3
  • Android Support Repository

Screenshots

Screenshot

Getting Started

This sample uses the Gradle build system. To build this project, use the "gradlew build" command or use "Import Project" in Android Studio.

Support

If you've found an error in this sample, please file an issue: https://github.com/android/user-interface

Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.

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