LeanType Offline AI Plugin

A dynamic plugin for the LeanType Keyboard providing 100% on-device neural proofreading, grammar correction, and local LLM text generation powered by llama.cpp (llamacpp-kotlin).

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✨ Features

• 🧠 100% On-Device AI: Local inference powered by optimized llama.cpp ARM64/x86_64 JNI binaries.
• 🛡️ Zero Internet & Complete Privacy: Runs entirely offline with zero network connectivity or external telemetry.
• ⚡ Fast Neural Proofreading & Grammar Correction: Correct spelling, fix punctuation, and refine writing with local GGUF models (e.g. Qwen2.5, Gemma 2, Llama 3, SmolLM).
• 🔒 Designed for Offline Editions: Built specifically for LeanType Offline and Offline Lite flavors with zero internet permissions (Online flavors use built-in Cloud AI).
• 📦 Dynamic Isolated Architecture: Loaded on-demand via DexClassLoader with isolated native libraries and zero footprint when inactive.

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Important

• Do NOT Install as a Standalone App: Do not install this APK directly into Android OS via the package manager. It is loaded dynamically inside LeanType settings.
• Model Requirement: Requires downloading a compatible GGUF quantized model (e.g. Qwen2.5-0.5B-Instruct-Q4_K_M.gguf or Qwen2.5-1.5B-Instruct-Q4_K_M.gguf) into your device storage.

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📋 System Requirements

• Operating System: Android 7.0 (API 24) or higher
• Supported CPU Architectures: arm64-v8a (64-bit ARM), x86_64 (64-bit x86)
• Host Keyboard: LeanType v4.1.6+ (Offline or Offline Lite flavors)
• RAM: Recommended 3 GB+ RAM for 0.5B–1.5B GGUF models

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🛠️ How it Works

To maintain a lightweight ~9.8 MB core keyboard, the heavy local LLM inference engine and JNI shared libraries (libllama.so) are isolated into this dynamic plugin.

At runtime, LeanType loads this plugin dynamically via OfflineAiLoader and PluginClassLoader when offline proofreading or AI text operations are requested.

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📥 Installation & Setup (Offline & Offline Lite Flavors)

1. Download ai_plugin-arm64-v8a.apk (or ai_plugin-x86_64.apk) from the Latest Releases.
2. In LeanType, navigate to Settings → Plugins.
3. Tap Load Offline AI plugin and select the downloaded .apk file.
4. Select your downloaded .gguf model file in Settings → Proofread & AI Settings.

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🏗️ Building From Source

To compile the release APKs from source:

./gradlew assembleRelease

The compiled APKs will be generated at:

• app/build/outputs/apk/release/ai_plugin-arm64-v8a.apk
• app/build/outputs/apk/release/ai_plugin-x86_64.apk

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📄 License

Licensed under the GNU General Public License v3.0 (GPL-3.0).