Readium Kotlin Toolkit

Readium Mobile is a toolkit for ebooks, audiobooks and comics written in Swift & Kotlin.

☝️ Take a look at the guide to quickly get started. A Test App demonstrates how to integrate the Readium Kotlin toolkit in your own reading app.

❓ Find documentation and API reference at readium.org/kotlin-toolkit.

Features

✅ Implemented      🚧 Partially implemented      📆 Planned      👀 Want to do      ❓ Not planned

Formats

Format	Status
EPUB 2	✅
EPUB 3	✅
Readium Web Publication	🚧
PDF	✅
Readium Audiobook	✅
Zipped Audiobook	✅
Standalone audio files (MP3, AAC, etc.)	✅
Readium Divina	🚧
CBZ (Comic Book ZIP)	🚧
CBR (Comic Book RAR)	❓
DAISY	👀

Features

A number of features are implemented only for some publication formats.

Feature	EPUB (reflow)	EPUB (FXL)	PDF
Pagination	✅	✅	✅
Scrolling	✅	👀	✅
Right-to-left (RTL)	✅	✅	✅
Search in textual content	✅	✅	👀
Highlighting (Decoration API)	✅	✅	👀
Text-to-speech (TTS)	✅	✅	👀
Media overlays	📆	📆

OPDS Support

Feature	Status
OPDS Catalog 1.2	✅
OPDS Catalog 2.0	✅
Authentication for OPDS	📆
Readium LCP Automatic Key Retrieval	📆

DRM Support

Feature	Status
Readium LCP	✅
Adobe ACS	❓

User Guides

Guides are available to help you make the most of the toolkit.

Publication

• Opening a publication – parse a publication package (EPUB, PDF, etc.) or manifest (RWPM) into Readium Publication models
• Extracting the content of a publication – API to extract the text content of a publication for searching or indexing it
• Supporting PDF documents – setup the PDF support in the toolkit
• Text-to-speech – read aloud the content of a textual publication using speech synthesis
• Accessibility – inspect and present accessibility metadata to users

Navigator

• Navigator - an overview of the Navigator to render a Publication's content to the user
• Configuring the Navigator – setup and render Navigator user preferences (font size, colors, etc.)
• Font families in the EPUB navigator – support custom font families with reflowable EPUB publications
• Media Navigator – use the Media Navigator to read aloud a publication (audiobook, TTS, etc.)

DRM

• Supporting Readium LCP – open and render LCP DRM protected publications

Setting up the Readium Kotlin toolkit

Minimum Requirements

Readium	Android min SDK	Android compile SDK	Kotlin compiler (✻)	Gradle (✻)
develop	21	35	2.1.20	8.13
3.1.0	21	35	2.1.20	8.13
3.0.0	21	34	1.9.24	8.6.0
2.3.0	21	33	1.7.10	6.9.3

✻ Only required if you integrate Readium as a submodule instead of using Maven Central.

Dependencies

Readium modules are distributed with Maven Central. Make sure that you have the $readium_version property set in your root build.gradle, then add the Maven Central repository.

buildscript {
    ext.readium_version = '3.1.0'
}

allprojects {
    repositories {
        mavenCentral()
    }
}

Then, add the dependencies to the Readium modules you need in your app's build.gradle.

dependencies {
    implementation "org.readium.kotlin-toolkit:readium-shared:$readium_version"
    implementation "org.readium.kotlin-toolkit:readium-streamer:$readium_version"
    implementation "org.readium.kotlin-toolkit:readium-navigator:$readium_version"
    implementation "org.readium.kotlin-toolkit:readium-opds:$readium_version"
    implementation "org.readium.kotlin-toolkit:readium-lcp:$readium_version"
}

⚠️ If you target Android devices running below API 26, you must enable core library desugaring in your application module.

Using a local Git clone

You may prefer to use a local Git clone if you want to contribute to Readium, or if you are using your own fork.

First, add the repository as a Git submodule of your app repository, then checkout the desired branch or tag:

git submodule add https://github.com/readium/kotlin-toolkit.git

Then, include the Readium build to your project's settings.gradle file. The Readium dependencies will automatically build against the local sources.

// Provide the path to the Git submodule.
includeBuild 'kotlin-toolkit'

⚠️ When importing Readium locally, you will need to use the same version of the Android Gradle Plugin in your project.

Building with Readium LCP

Using the toolkit with Readium LCP requires additional dependencies, including the binary liblcp provided by EDRLab. Contact EDRLab to request your private liblcp and the setup instructions.