Termux - a terminal emulator application for Android OS extendible by variety of packages.

ZXing ("Zebra Crossing") barcode scanning library for Java, Android

Telegram for Android source

A collection of algorithms and data structures

Cracking the Coding Interview 6th Ed. Solutions

High-quality QR Code generator library in Java, TypeScript/JavaScript, Python, Rust, C++, C.

Code scanner library for Android, based on ZXing

Allows items to be placed within the AR world with real-world GPS coordinates using ARCore.

This AR app generally show where things are in the real-world by indicating where the app thinks they are over the camera view when the user holds the phone up and moves it about.

Java and Android bindings for ROS2

This is the official GameController used for several RoboCup competitions

Example Java applications for the ROS2 Java bindings