The ultimate Android keyboard - 200+ features for developers, writers, and power users

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Omega Launcher 08378546f9 Add GitHub Actions workflows - Android build workflow (CI on every push) - Release workflow (CD for version tags) - Automated APK building and artifact upload - Lint checks with reports Workflows will build the keyboard on every push. Note: Build will fail until KeyboardView UI is implemented. Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>		2026-06-12 07:51:14 +01:00
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README.md

OmniKey - The Ultimate Android Keyboard

Every feature. Every user. One keyboard.

🚀 Overview

OmniKey is the most comprehensive Android keyboard ever built, combining every requested feature from everyday users, developers, writers, content creators, and accessibility users into one powerful, customizable package.

Why OmniKey?

🎨 Unlimited Customization - Themes, layouts, gestures, macros
💻 Developer-Focused - Code completion, terminal mode, snippets
✍️ Writer-Optimized - Grammar check, thesaurus, readability metrics
🌍 100+ Languages - With auto-detection and bilingual support
🔒 Privacy-First - Incognito mode, offline, encrypted storage
♿ Fully Accessible - High contrast, voice feedback, switch control
🤖 AI-Powered - ML Kit integration for predictions and translation
⚡ Lightning Fast - <10ms latency, <50MB RAM

✨ Core Features

🎯 For Everyone

Smart Typing

Swipe/Glide Typing - Smooth gesture input with trail visualization
Next-Word Prediction - Context-aware suggestions using n-gram models
Autocorrect - Adjustable aggressiveness with learned typo patterns
Text Expansion - "omw" → "On my way!" with 100+ built-in shortcuts
Clipboard History - Last 100 items with smart categorization
Emoji Prediction - AI suggests relevant emoji based on context
Voice Input - Full speech-to-text with partial results

Layouts & Themes

10 Built-in Themes - Light, Dark, Material You, Nord, Monokai, Solarized, Dracula, Gruvbox, High Contrast
Unlimited Custom Themes - Full color control, gradients, RGB effects, background images
Multiple Layouts - QWERTY, AZERTY, DVORAK, Colemak, QWERTZ
One-Handed Mode - Slide keyboard left/right for thumb typing
Floating Keyboard - Movable, resizable, perfect for multitasking
Split Keyboard - Optimized for tablets

Gestures

Spacebar Cursor Control - Swipe left/right to move cursor
Swipe to Delete Word - Quick text removal
Two-Finger Undo/Redo - Swipe left/right with two fingers
Custom Gesture Mapping - Assign any action to any gesture
Pinch to Resize - Scale keyboard on the fly

Multi-Language

100+ Languages - Full Unicode support
Auto Language Detection - Seamless switching with ML Kit
Bilingual Predictions - Mix languages freely (e.g., English + Spanish)
Per-App Languages - Different language for different apps
RTL Support - Arabic, Hebrew, Persian, Urdu

💻 For Developers & Programmers

Code Input

Dedicated Coding Layout - All symbols accessible: {}[]()<>\/|&*+-=;:"'
Bracket Auto-Pairing - Type {, get {} with cursor between
Smart Indent - Auto-indent after {, :, or function definitions
Tab Support - Configurable: 2/4/8 spaces or \t
Arrow Keys - Virtual or swipe-based cursor control
Undo/Redo Stack - 50-level history for code edits

Code Completion

Language Detection - Auto-detects JavaScript, Python, Java, Kotlin, etc.
Snippet Expansion - for → full for-loop, if → if-statement, class → class skeleton
Keyword Suggestions - Language-specific (const, def, fun, etc.)
API Completions - Common functions (console.log, print, etc.)
Comment Templates - JSDoc, Python docstrings, Java/Kotlin KDoc

Terminal Mode

Shell-Optimized Layout - Ctrl, Alt, Esc, Tab prominent
Command History - Recalls recent shell commands
Common Commands - git, npm, docker, apt, ssh quick access
Pipe Symbols - |, >, >>, <, 2>&1 one tap away
Escape Sequences - Quick insert \n, \t, \e

Developer Tools

Case Conversion - camelCase, snake_case, kebab-case, PascalCase
JSON Formatter - Auto-format pasted JSON
Base64 Encode/Decode - Select text, convert
UUID Generator - Insert v4 UUIDs
Hash Generator - MD5, SHA256 from clipboard
Git Integration - Commit templates, conventional commits, co-author lines

✍️ For Writers & Content Creators

Writing Assistance

Grammar Check - Real-time with ML (simplified patterns included)
Thesaurus - Synonym suggestions on long-press
Readability Metrics - Flesch-Kincaid grade level, reading time
Word/Character Count - Real-time status bar display
Sentence Analysis - Flags overly long or complex sentences

Smart Punctuation

Curly Quotes - "text" → "text" automatically
Em/En Dashes - -- → —, - → –
Ellipsis - ... → …
Symbols - © ™ ® ° ½ ¼ ¾ quick access
Accent Compose - e + ' → é

Markdown

Full Toolbar - Headers, bold, italic, lists, links, images
Auto-Pairing - **bold**, *italic*, ``code``
Table Creator - Visual table builder
Task Lists - - [ ] checkbox syntax
Link Insertion - Paste URL, auto-format [](url)

Templates

Email Templates - Formal, casual, business
Meeting Notes - Agenda, discussion, action items
Blog Post - Intro, body, conclusion structure
Story Scenes - Screenplay/novel formatting

🎨 For Content Creators

Hashtag Suggestions - Context-aware
@ Mention Autocomplete - From contacts/recent
Emoji Search - By keyword ("heart", "laugh")
Emoji Kitchen - Combine emojis (requires Google integration)
Kaomoji Library - ¯_(ツ)_/¯, (╯°□°)╯︵ ┻━┻, ʕ•ᴥ•ʔ

Platform Optimization

Character Limits - Twitter (280), Instagram, SMS warnings
Optimal Length - Suggestions per platform
Hashtag Counter - Warns if too many

🔢 For Data Entry

Numeric Input

Calculator Layout - Dedicated numeric keypad
Decimal Alignment - Auto decimal point
Thousands Separator - 1,000,000 auto-format
Currency Support - $, €, ¥, £, ₹, ₽, ₿

Form Filling

Field Detection - Email, phone, address auto-format
Saved Entries - Recent addresses, phones, emails
Credit Card Format - XXXX XXXX XXXX XXXX spacing
Date Formats - MM/DD/YYYY, DD/MM/YYYY, ISO-8601

♿ For Accessibility

Motor Impairments

Sticky Keys - Press modifiers sequentially, not simultaneously
Large Touch Targets - Up to 200% key size
Dwell Clicking - Hover to type (configurable delay)
Switch Control - External switch support
Morse Code - Two-key typing mode

Visual Impairments

High Contrast - Black/white or custom
Large Text - Up to 48pt key labels
Voice Feedback - Reads every key press
Braille Support - External display compatibility
TalkBack Integration - Full screen reader support

Cognitive Accessibility

Simplified Mode - Large keys, minimal UI
Picture Keyboard - Symbol-based input
Word Prediction - Reduces typing load
Focus Mode - Single-key highlight

🔒 Privacy & Security

Incognito Mode - No learning, no history, no logs
Offline Mode - Zero network permissions (optional)
Encrypted Storage - All learned data encrypted (Android Keystore)
Biometric Clipboard - Lock sensitive clipboard items
Auto-Clear Clipboard - Expire after 1-30 days
Per-App Incognito - Auto-enable for password managers, banking

🏗️ Architecture

Tech Stack

Language: Kotlin 1.9.20
Min SDK: Android 7.0 (API 24)
Target SDK: Android 14 (API 34)
Architecture: MVVM + Clean Architecture
Database: Room (SQLite)
Storage: DataStore (Preferences)
ML: ML Kit (Google)
Coroutines: kotlinx.coroutines

Project Structure

com.omnkey.keyboard/
├── core/
│   ├── database/          # Room database, DAOs, converters
│   ├── model/             # Data classes, entities
│   ├── preferences/       # DataStore preferences manager
│   └── engine/            # Core logic engines
│       ├── PredictionEngine      # Word/next-word prediction
│       ├── SwipeEngine           # Gesture typing recognition
│       ├── AutocorrectEngine     # Typo correction
│       ├── TextReplacementEngine # Shortcuts expansion
│       ├── GestureEngine         # Custom gesture mapping
│       ├── ClipboardManager      # History & management
│       ├── ThemeEngine           # Theme loading & creation
│       ├── VoiceEngine           # Speech-to-text
│       ├── MLEngine              # Language detection, translation
│       ├── CodeEngine            # Developer features
│       ├── WriterEngine          # Writing assistance
│       ├── HapticHelper          # Vibration patterns
│       └── SoundHelper           # Keyboard sounds
├── service/
│   └── OmniKeyService    # InputMethodService (main keyboard)
└── ui/
    ├── MainActivity           # Settings & onboarding
    ├── keyboard/KeyboardView  # Keyboard rendering
    ├── theme/ThemeEditor      # Theme customization
    ├── clipboard/Clipboard    # Clipboard history UI
    └── settings/              # All settings screens

Key Components

OmniKeyService

Main InputMethodService that:

Manages keyboard lifecycle
Handles key presses, swipes, gestures
Routes input to appropriate engines
Detects input context (terminal, code, writing)
Applies app-specific settings

PredictionEngine

N-gram word prediction model
Learns from typing history (Room database)
Prefix-based completion
Context-aware suggestions

CodeEngine

Language detection (simple heuristics)
Snippet expansion with placeholders
Auto-pairing: brackets, quotes
Terminal command completion
Undo/redo stack (50 levels)

WriterEngine

Grammar rules (regex-based)
Readability scoring (Flesch-Kincaid)
Smart punctuation (curly quotes, em-dashes)
Markdown auto-completion

ThemeEngine

10 built-in themes
Unlimited custom themes (stored in Room)
RGB effects (would require custom view rendering)
Background image support

🚀 Getting Started

Prerequisites

Android Studio Hedgehog (2023.1.1) or later
JDK 17
Android SDK 34
Gradle 8.2+

Build & Install

# Clone the repository
git clone https://github.com/yourusername/omnikey.git
cd omnikey

# Build debug APK
./gradlew assembleDebug

# Install to device
./gradlew installDebug

Enable Keyboard

Open OmniKey app
Tap Enable Keyboard → Goes to System Settings
Toggle OmniKey on
Tap Select Keyboard → Choose OmniKey
Grant permissions (if prompted)

📖 Usage

Basic Typing

Tap keys to type
Long-press for alternate characters (à, é, 1, !)
Swipe space bar left/right to move cursor
Swipe up from backspace to delete word

Code Mode

Auto-enables in:

Termux, JuiceSSH (terminal apps)
Code editors (detects by package name)
Fields with TYPE_TEXT_FLAG_NO_SUGGESTIONS

Manual toggle: Settings → Developer → Code Auto Complete

Writer Mode