Extensive Open-Source Guides for Android Developers

A lightweight implementation of Android In-app Billing Version 3

[DEPRECATED] Android floating action button

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

Android Library to rapidly develop attractive and insightful charts in android applications.

A high performance thread-safe map that expires entries

Simple custom drawing android analog clock (UI from Jelly Bean 4.2)

A modern I/O library for Android, Java, and Kotlin Multiplatform.

A Java library that models spring dynamics and adds real world physics to your app.

Bind Android views and callbacks to fields and methods.

Android library used to create an awesome Android UI based on a draggable element similar to the last YouTube graphic component.

A lightweight non intrusive app rate reminder for Android

A layout engine for Android that decouples layouts from the View containers that manage scrolling and view recycling. FreeFlow makes it really easy to create custom layouts and beautiful transition…

Spans, a powerful concept

Conceal provides easy Android APIs for performing fast encryption and authentication of data.

Android Studio plugin which automatically generates drawable selectors from appropriately named resources.

An IntelliJ IDEA plugin to navigate between events posted by Otto.

A friendly library to prompt your users to rate your app.

An Android staggered grid view which supports multiple columns with rows of varying sizes.

This project has been superseded by SuperSLiM, a layout manager for RecyclerView. I strongly recommend using SuperSLiM and not StickyGridHeaders.

Android app for managing multiple social network feeds, including Twitter, Facebook, MySpace, Google+, LinkedIn, Identi.ca, SMS, and RSS.

Building FFmpeg for Android neon, armv7, vfp and armv6, used in VPlayer for Android

In-layout notifications. Based on Toast notifications and article by Cyril Mottier (http://android.cyrilmottier.com/?p=773).

[DEPRECATED] An Android library which allows developers to easily add animations to ListView items

A type-safe HTTP client for Android and the JVM

A powerful image downloading and caching library for Android

ckChangeLog - An Android Library to display a Change Log

Local server for Android's HierarchyViewer