LeanType Handwriting Plugin

A dynamic plugin for the LeanType Keyboard enabling real-time on-device handwriting recognition powered by Google ML Kit Digital Ink Recognition.

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✨ Features

• ✍️ 100% On-Device Recognition: Fast, private character and word recognition directly on your device.
• 🌍 300+ Languages Supported: Recognize Latin, Cyrillic, CJK, Indic, Arabic, and hundreds of regional scripts.
• 📦 In-App & Offline Model Manager: Download language models directly in online builds, or use the browser download popup and multi-file/batch .zip importer on offline builds.
• 🔄 Universal Compatibility: Supported across all 4 LeanType flavors (Standard, Standard Full, Offline, and Offline Lite).
• 🔌 Dynamic Isolated Loading: Loaded dynamically via DexClassLoader with isolated native libraries and zero runtime footprint when inactive.

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Important

• Do NOT Install Directly: Do not install this APK as a standalone application into Android OS. It must only be loaded internally through LeanType settings.
• Zero-Network Recognition: Recognition runs 100% offline on your device. Internet connectivity is only used during initial model downloads on online builds.

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🛠️ How it Works

To maintain a lean, pure FOSS core keyboard while giving users access to advanced handwriting capabilities, this plugin isolates the ML Kit SDK and native libraries (libdigitalink_native.so) into a separate dynamic package.

At runtime, LeanType loads this plugin dynamically via PluginClassLoader when handwriting input is invoked.

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📥 Installation & Setup

Option 1: In-App Downloader (Online Flavors)

1. Open LeanType Settings → Handwriting (or Settings → Plugins).
2. Tap Download Plugin to automatically fetch and activate the latest release APK.
3. Tap Offline Handwriting Models to download your desired language recognition packs.

Option 2: Manual Loading (Offline & Offline Lite Flavors)

1. Download handwriting_plugin.apk from the Latest Releases.
2. In LeanType, navigate to Settings → Handwriting (or Settings → Plugins).
3. Tap Load handwriting plugin and select the downloaded .apk file.
4. Tap Offline Handwriting Models to download models via browser or import downloaded .zip model archives.

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🏗️ Building From Source

To compile the release APK from source:

./gradlew assembleRelease

The compiled APK will be generated at: app/build/outputs/apk/release/handwriting_plugin.apk

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📄 License

Licensed under the Apache License 2.0.