A desktop-class text and source code editor engineered specifically for Android devices.
NoteCode++ brings the productivity and classic developer workflow of desktop code editors like Notepad++ to Android. Built 100% natively using Jetpack Compose and Material Design 3, NoteCode++ is designed for programmers, sysadmins, writers, and power users who need a robust, privacy-first code editor on phones and tablets.
- Open, edit, and switch between multiple documents seamlessly.
- Visual dirty/modified indicators (*) and tab close affordances.
- New tab creation, document renaming, and quick document switching.
- Built-in lexical syntax highlighters for 12+ programming and markup languages:
- Kotlin, Java, Python, JavaScript, TypeScript, C, C++, HTML, CSS, JSON, Markdown, XML, SQL, Shell, Plain Text.
- 8 Themes including:
- Notepad++ Classic
- Modern Dark
- Monokai
- Dracula
- Solarized Dark
- Solarized Light
- Nord
- GitHub Light
- Uses Android's Storage Access Framework (SAF) to open and save files from:
- Internal device storage
- MicroSD cards
- USB OTG drives
- Cloud storage providers (Google Drive, Nextcloud, OneDrive)
- Two-Finger Pinch Gestures: Smoothly pinch-in to decrease or pinch-out to increase editor text size dynamically (8sp to 36sp).
- Interactive HUD Overlay: Displays live font size and scale percentage with a one-tap Reset button to return to 100% (14sp).
- Dynamic Gutter & Alignment: Line number gutter and code canvas scale in exact lockstep without clipping or cursor jitter.
- Status Bar Zoom Pill: Quick at-a-glance zoom indicator in the status bar with tap-to-reset.
- Fast in-editor search with real-time match highlighting.
- Next / Previous match navigation.
- Match Case (case-sensitive), Whole Word, and Regex (Regular Expression) search support.
- One-by-one or replace-all operations.
- Sort Lines: Sort selected or document lines ascending (A-Z) or descending (Z-A).
- Remove Duplicate Lines: Instant deduplication for lists and configs.
- Trim Whitespace: Clean leading and trailing spaces across all lines.
- Join Lines / Reverse Lines: Invert or collapse text structures.
- Line Operations: Duplicate line, delete line, toggle comment syntax, and insert timestamps.
- Bookmarks: Set line bookmarks, jump between next/previous bookmarks, and clear all.
- Go to Line: Instant navigation to any line number.
- Case Conversion: UPPERCASE, lowercase, Title Case, camelCase, snake_case, and kebab-case.
- Real-time status bar showing cursor line, column number, character selection length, total characters, and line count.
- Detailed Document Statistics Dialog: word count, character count (with and without whitespace), and formatted file size in bytes/KB/MB.
- Line ending detection and switching: Unix (LF) vs. Windows (CRLF).
- Character encoding handling: UTF-8 and ANSI (Windows-1252).
- Built-in previewer to render Markdown and live HTML/CSS output directly inside the app.
- Zero telemetry, zero analytics tracking, and zero advertising SDKs.
- Operates entirely locally on your device with no required account or subscription paywall.
The compiled debug APK is included directly in this repository:
- Location: apk/notecode-plus-plus-debug.apk
- Download notecode-plus-plus-debug.apkdirectly to your Android device or clone this repo.
- In Android Settings, ensure Install unknown apps is permitted for your browser or file manager.
- Tap the downloaded .apkfile and select Install.
Alternatively, install via ADB:
adb install apk/notecode-plus-plus-debug.apk- Language: Kotlin (100%)
- UI Framework: Jetpack Compose with Material Design 3
- Architecture: MVVM (Model-View-ViewModel) + Unidirectional Data Flow (UDF)
- Asynchronous Flow: Kotlin Coroutines & StateFlow
- File Access: Android Storage Access Framework (SAF) OpenDocument&CreateDocument
- Build System: Gradle with Kotlin DSL (build.gradle.kts) and Version Catalogs (libs.versions.toml)
- Android Studio: Ladybug / Meerkat or newer
- JDK: Version 17+
- Android SDK: Compile SDK 34, Min SDK 26
# Clone the repository
git clone https://github.com/your-username/notecode-android.git
cd notecode-android
# Build Debug APK
./gradlew assembleDebug
# The APK will be generated at:
# app/build/outputs/apk/debug/app-debug.apk├── apk/
│ └── notecode-plus-plus-debug.apk # Pre-compiled ready-to-install APK
├── app/
│ ├── src/main/
│ │ ├── java/com/example/
│ │ │ ├── data/model/ # Document entities & state models
│ │ │ ├── ui/
│ │ │ │ ├── components/ # Canvas, Toolbars, Dialogs, Status & Tab Bars
│ │ │ │ ├── screen/ # Main NotepadScreen Compose view
│ │ │ │ ├── syntax/ # Lexer & Syntax Highlighter engine
│ │ │ │ ├── theme/ # Editor theme palettes & M3 theming
│ │ │ │ └── viewmodel/ # EditorViewModel & state managers
│ │ │ └── MainActivity.kt # Main single-activity entry point
│ │ └── res/ # Vector assets, launcher icons, strings
│ └── build.gradle.kts
├── gradle/
│ └── libs.versions.toml # Gradle Version Catalog
└── README.md
This project is open-source under the Apache 2.0 License. Feel free to fork, contribute, and adapt it for your own developer tool needs!