RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

A powerful 🚀 Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick charts as well as scaling, panning and animations.

Render After Effects animations natively on Android and iOS, Web, and React Native

An image loading and caching library for Android focused on smooth scrolling

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

Event bus for Android and Java that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality.

A Java serialization/deserialization library to convert Java Objects into JSON and back

RxJava bindings for Android

Implementation of ImageView for Android that supports zooming, by various touch gestures.

A fast dependency injector for Android and Java.

Modular and customizable Material Design UI components for Android

✔️ Simple, pretty and powerful logger for android

Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.

Stetho is a debug bridge for Android applications, enabling the powerful Chrome Developer Tools and much more.

A Java API for generating .java source files.

A collection of source code generators for Java.

Annotation-triggered method call logging for your debug builds.

OWASP dependency-check is a software composition analysis utility that detects publicly disclosed vulnerabilities in application dependencies.

Java DSL for easy testing of REST services

Runtime code generation for the Java virtual machine.

An implementation of tap targets from the Material Design guidelines for feature discovery.

Keep your code spotless

Android library that simplifies the process of requesting permissions at runtime.

✔️ Secure, simple key-value storage for Android

A small, yet full-featured framework that allows building View-based Android applications

A search view that implements a floating search bar also known as persistent search

Material Design implementation for Android 4.0+. Shadows, ripples, vectors, fonts, animations, widgets, rounded corners and more.

"Favor composition over inheritance" for RecyclerView Adapters

Deprecated: The Mobile Vision API is now a part of ML Kit: Check out this repo: