Open Source Java Libraries - Page 12
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Java Libraries
View 75 business solutionsBrowse free open source Java Libraries and projects below. Use the toggles on the left to filter open source Java Libraries by OS, license, language, programming language, and project status.
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This project manages program (usually web) flow and web page /web component generation. Currently this project is only integrated with Tapestry 4. However, the code is separated out and implementing different web UI frameworks should be possible.
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AndLess
This project provides libraries and tools for Android.
This project provides libraries and tools for Android, starting with an endless list implementation and support for easy integration of Apache Solr data into an endless list. An additional library will be an Android forms library for easy and consistent form creation for business apps. -
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Android Auto Scroll ViewPager
Android common lib, include ImageCache, HttpCache, DropDownListView
Android Auto Scroll ViewPager is a Java-based UI library for Android applications that enhances the standard ViewPager component by adding automatic scrolling and cycling behavior, making it particularly useful for image carousels, featured content sliders, and other rotating views. Designed to extend the classic Android support library’s ViewPager, it enables views to scroll automatically at a configurable interval while also allowing manual swiping by the user, combining both automation and interactive control. In addition to auto-scroll timing, developers can configure the scroll direction, cycle mode (so the pager loops continuously), and animation duration to create smooth and responsive carousel experiences. The library also includes settings to control whether scrolling stops when the user touches the component and how border conditions are handled at the start or end of the list. -
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Android Drag Dismiss Activity
A smooth, easy-to-implement, drag to dismiss Android Activity
Another implementation of the drag-to-dismiss Activity pattern. This one is inspired by Nick Butcher's Plaid implementation. The project has a simple API and is a pretty powerful and beautiful implementation of the pattern. This library is used in some of my apps (Talon for Twitter and Pulse SMS). It has been abstracted from Jacob Klinker and I's article-android library, which is an awesome readability style in-app web browser. This library provides an elastic layout that can dismiss an Activity with a RecyclerView or a regular Activity. Whenever the user swipes up or down, from the bottom or the top of the content, the DragDismissActivity will finish. -
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Android Interview Questions
Your Cheat Sheet For Android Interview
This repository is a comprehensive study guide for Android interviews, organized to cover the platform from fundamentals to advanced topics. It includes explanations and Q&A on the Android app lifecycle, activities and fragments, services, broadcast receivers, content providers, and the build system. Modern practices are addressed as well—Kotlin language features, coroutines, Jetpack components, MVVM/MVI architecture, dependency injection, and testing strategies. Performance and reliability topics receive attention, such as memory management, threading, WorkManager, networking, and offline storage patterns. The content favors concise, practical answers that interviewers expect, helping candidates rehearse concepts and trade-offs rather than memorize trivia. It’s equally useful for brushing up before an interview and for leveling up day-to-day Android engineering knowledge. -
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Android PDF Writer (APW) is a simple Java library to generate simple PDF documents in Google's Android devices released under the BSD license.
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Android PDF Writer Enhanced (APWE)
Library to create PDF files from Android
This library allow to create PDF files from Android versions older than API 19, where PDF support was added. It's based on APW project by Javier Santo Domingo located at: https://sourceforge.net/projects/apwlibrary/ -
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Android PDF Writer Enhanced Demo
Demo for Android PDF Writer Enhanced Library
This is a demonstration of the features of Android PDF Writer Enhanced library. -
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Android Saripaar
UI form validation library for Android
Android Saripaar is a simple, feature-rich and powerful rule-based UI form validation library for Android. It is the SIMPLEST UI validation library available for Android. Built on top of Apache Commons Validator, a validation framework with proven track record on the web, desktop and mobile platforms. Declarative style validation using Annotations. Extensible, now allows Custom Annotations. Synchronous and Asynchronous validations, you don't have to worry about threading. Supports both BURST and IMMEDIATE modes. Works with Stock Android Widgets, no custom view dependencies. Isolates validation logic using rules. -
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Android Sliding Up Panel
A simple way to add a draggable sliding up panel to Android apps
This library provides a simple way to add a draggable sliding up panel (popularized by Google Music and Google Maps) to your Android application. As seen in Umano Android App (now acquired by Dropbox). If you are using the library and you would like to have your app listed, simply let us know. Simply add the following dependency to your build.gradle file to use the latest version. Include com.sothree.slidinguppanel.SlidingUpPanelLayout as the root element in your activity layout. The layout must have gravity set to either top or bottom. Make sure that it has two children. The first child is your main layout. The second child is your layout for the sliding up panel. The main layout should have the width and the height set to match_parent. The sliding layout should have the width set to match_parent and the height set to either match_parent, wrap_content or the max desireable height. -
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Android Tips & Tricks
[Cheatsheet] Tips and tricks for Android Development
Android Tips and Tricks is a community-oriented cheatsheet containing practical advice for Android application development. It collects techniques gathered from personal experience, developer discussions, and external technical resources. The material covers Android Studio, Java, Kotlin, Gradle, ADB, interface design, performance, libraries, and general development workflows. Short explanations and code-oriented examples make the repository suitable for quick reference rather than linear coursework. A searchable mdBook edition provides an easier way to browse the growing collection. Contributors can expand or correct the guide through pull requests. The project is useful for discovering lesser-known platform capabilities and improving everyday Android development practices. -
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AndroidAdapters
A library, which provides various Adapters for Android apps
"AndroidAdapters" is an Android-library, which provides feature-rich adapter implementations for providing the underlying data of widgets such as ListView, GridView, ExpandableListView and RecyclerView. -
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AndroidAsync
Asynchronous socket, http(s) (client+server) and websocket library
AndroidAsync is a low-level asynchronous networking library for Android. It provides raw sockets, HTTP and HTTPS client and server functionality, and WebSocket support. The library is based on Java NIO rather than a thread-heavy model, which makes it suitable for event-driven network communication. It is intended for developers who need direct protocol-level control instead of a higher-level request wrapper. The project also serves as the foundation for Ion, the author’s higher-level Android networking and image loading library. AndroidAsync is most useful for Android developers building custom networking layers, servers, streaming behavior, or WebSocket-based features. -
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AndroidEventBus
Library for android, simplifies communication between services
AndroidEventBus is an Android-oriented event dispatching library that provides a flexible, lifecycle-aware, and decoupled mechanism for managing communication between components without tight coupling — especially useful in large, modular applications. It allows developers to define and post custom events that can be observed by multiple parts of an app, such as UI controllers, services, or background workers, without requiring direct references between senders and receivers. Unlike simple observer patterns, AndroidEventBus typically integrates with Android lifecycles so that subscribers are automatically registered, paused, or cleaned up based on activity/fragment state — reducing memory leaks and errant behavior during configuration changes. The library aims to simplify common inter-component messaging tasks (like posting a login success event or notifying multiple listeners of state changes) while preserving type safety and performance. -
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AndroidRate
Library to help you promote your Android app
AndroidRate is a library to help you promote your Android app by prompting users to rate the app after using it for a few days. -
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AnotherFSM
State machines for Java, FSM.
AnotherFSM is yet another implementation of state machines, a library for Java programming language. -
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Ant task that generates a Java class (source code) with constants. All values are provided from Ant constants or properties. It's normally used to provide build details to a Java application.
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Ant SSH utils
SSH command execution, upload and download from Ant
Simple SSH tasks that can be used from Ant. Includes three SSH Ant tasks: * Run one/multiple commands over SSH in Ant. * Uploads one/multiple files over SSH in Ant. * Downloads one/multiple files over SSH in Ant. Simpler class loading since no external libraries are required to add to your Ant installation. All libraries are stored in your project directory, instead of your Ant installation. -
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Apache Drill
Apache Drill is a distributed MPP query layer for self describing data
Apache Drill is a distributed MPP query layer that supports SQL and alternative query languages against NoSQL and Hadoop data storage systems. It was inspired in part by Google's Dremel. Get faster insights without the overhead (data loading, schema creation and maintenance, transformations, etc.) Analyze the multi-structured and nested data in non-relational datastores directly without transforming or restricting the data. Leverage your existing SQL skillsets and BI tools including Tableau, Qlikview, MicroStrategy, Spotfire, Excel and more. Drill supports a variety of NoSQL databases and file systems, including HBase, MongoDB, MapR-DB, HDFS, MapR-FS, Amazon S3, Azure Blob Storage, Google Cloud Storage, Swift, NAS and local files. A single query can join data from multiple datastores. For example, you can join a user profile collection in MongoDB with a directory of event logs in Hadoop. -
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Apache MINA SSHD
A comprehensive Java library for client- and server-side SSH
Apache MINA sshd is a comprehensive Java library for client- and server-side SSH. Apache MINA SSHD is a 100% pure java library to support the SSH protocols on both the client and server side. It does not aim at being a replacement for the SSH client or SSH server from Unix operating systems, but rather provides support for Java based applications requiring SSH support. -
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Apache Shiro
Apache Shiro
Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management. With Shiro’s easy-to-understand API, you can quickly and easily secure any application, from the smallest mobile applications to the largest web and enterprise applications. -
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Elements for web application, designed from the application programmer's point of view. Keywords: Java, Javascript, AJAX, MVC. The core component is a very flexible table implementation.
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ApprovalRatingBar
Swing component for displaying an Approval Rating Bar
This is a library for the Java programming language that let you use an approval rating bar in your Swing applications. The Approval Rating Bar component displays a rating bar, made of a custom number of markers, that can be selected/unselected by the user. The ApprovalRatingBar component handles the value choosen by the user or programmaticaly set via the standard setValue() method. It offers some other tricks, like component customization (type of marks, colors, images, orientation and starting-point) and registering of listeners (ActionListeners, ValueChangeListeners and SelectionChangeListeners). Min Java version required: Java 6 -
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Small general-purpose Java library. Examples are provided in JUnit tests and demo projects. Compatible with NetBeans and Eclipse.