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Material You 3 eBook/audiobook reader — Episteme fork + bookshelf-api/ABS
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Aryan 8582ed9679
Render embedded annotations in PDF (#59) 
* Added support for reading and displaying embedded PDF annotations.

Changes include:
- Added JNI bindings in `NativePdfiumBridge` and `pdfium_bridge.cpp` to extract annotation count, subtypes, rectangles, and string values (Contents, NM, IRT, T) using PDFium.
- Introduced `EmbeddedAnnotation` data class to represent PDF annotations and their reply threads.
- Implemented annotation extraction logic in `PdfPageComposable` to fetch, group, and map embedded annotations (Sticky Notes, Highlights, etc.) to screen coordinates.
- Updated `PdfSelectionMenuPopup` to support displaying and copying comment threads.
- Improved selection menu positioning and hit detection for annotations.
- Added a safety check to recycle bitmaps in `PdfTile` rendering if handover to the main thread fails.

* Improved comment thread UI
2026-03-12 10:11:42 +05:30
.github Update GitHub sponsor button with a username (#8) 2026-02-26 18:44:11 +05:30
app Render embedded annotations in PDF (#59) 2026-03-12 10:11:42 +05:30
docs docs: Revamp README and add APK naming convention (#2) 2026-02-25 19:54:43 +05:30
fastlane/metadata/android/en-US use HTML for fastlane full description (#15) 2026-02-27 21:59:10 +05:30
gradle Initial commit 2026-02-24 17:37:40 +05:30
spotless Update readme (#3) 2026-02-25 21:30:28 +05:30
.gitignore docs: add CLA and CONTRIBUTING guidelines (#26) 2026-03-04 10:19:17 +05:30
build.gradle.kts docs: Revamp README and add APK naming convention (#2) 2026-02-25 19:54:43 +05:30
CLA.md docs: add CLA and CONTRIBUTING guidelines (#26) 2026-03-04 10:19:17 +05:30
CONTRIBUTING.md Added stylus-only mode for PDF drawing and annotations. (#27) 2026-03-04 13:18:26 +05:30
gradle.properties Initial commit 2026-02-24 17:37:40 +05:30
gradlew Initial commit 2026-02-24 17:37:40 +05:30
gradlew.bat Initial commit 2026-02-24 17:37:40 +05:30
LICENSE Pdf text highlight (#49) 2026-03-09 17:37:44 +05:30
README.md Pdf reflow rework (#51) 2026-03-10 10:59:44 +05:30
settings.gradle.kts build: remove foojay-resolver-convention plugin for f-droid compliance (#12) 2026-02-27 15:08:39 +05:30

README.md

Episteme Reader Icon  Episteme Reader

A native Android document reader application built with Kotlin and Jetpack Compose.

Get it on Google Play

Episteme Reader Preview

Overview

Episteme Reader is an offline-first application designed for reading various document formats. It leverages native Android technologies and C++ libraries to provide a performant reading experience with customization capabilities.

Note: This is the Open Source (OSS) edition of Episteme Reader. The version available on the Google Play Store is built from this core but includes additional proprietary features.

Features

Supported Formats

  • Documents: PDF
  • E-books: EPUB, MOBI, AZW3
  • Text: MD, TXT, HTML

PDF Features

  • Viewing Modes: Vertical Scroll and Paginated view.
  • Ink Annotations: Draw directly on pages using Pen, Highlighter, and Eraser tools.
  • Text Annotations: Add text notes anywhere on the page using system or custom fonts.

E-Book Features

  • Parsing: Native parsing for MOBI/AZW3 via libmobi and EPUB via Jsoup.
  • Customization: Adjust font size, line spacing, and margins.
  • Custom Fonts: Support for importing user-provided font files (.ttf, .otf).

General

  • Text-to-Speech (TTS): Read documents aloud using the system TTS engine.
  • File Management: Built-in library organization.

Architecture

  • UI: 100% Jetpack Compose (Material3).
  • Architecture: MVVM with Unidirectional Data Flow.
  • Database: Room (SQLite) for metadata and annotations.
  • PDF Engine: pdfium-android (Native PDFium bindings).
  • EPUB Engine: Utilizes standard WebView for vertical scrolling mode, and a custom rendering engine for paginated mode.
  • Mobi Engine: Custom JNI bindings to libmobi.

Building from Source

  1. Clone the repository:

    git clone https://github.com/Aryan-Raj3112/episteme.git
cd episteme

  2. Build: Open in Android Studio and run the ossDebug variant.

    ./gradlew assembleOssDebug

Open Source Libraries

This project is made possible by the Android open-source ecosystem:

  • Core & UI: AndroidX, Jetpack Compose, Kotlinx Serialization
  • Document Engines: PdfiumAndroidKt (PDF), libmobi (MOBI/AZW3), Google WOFF2 (Fonts)
  • Parsers: Jsoup (HTML/EPUB), Flexmark (Markdown)
  • Media & Image Loading: Coil, Media3 (ExoPlayer)
  • Utilities: Room (Database), Timber (Logging)

License

This project is licensed under the GNU Affero General Public License v3.0 (AGPL-3.0). See the LICENSE file for details.

Support

If you find Episteme Reader useful and want to support its development, please consider sponsoring. Thank you!

Sponsor on GitHub