A curated list of awesome Android libraries and resources. For general Java libraries have a look at awesome-java.

• Libraries
  • Charts
  • Dependency Injection
  • Game Development
  • GUI
    • ActionBar
    • Navigation
    • Animations
    • Images
    • Inputs
    • Loading images
  • JSON
  • Crash monitoring
  • Networking
  • Database
    • ORM
  • REST
  • Testing
  • Tracking
  • Utility
  • Wireless
  • Other
• Resources
  • More lists of libraries
• Development Alternatives
  • C#
  • HTML, CSS and Javascript
  • Lua
  • Scala
  • Groovy
  • Kotlin
• Other Awesome Lists
• Contributing

• AChartEngine - Charting Engine.
• EazeGraph - Chart and graph library.
• WilliamChart - Chart library with good motion capabilities.
• HelloCharts - Chart and graph library with support for scaling, scrolling and animations.
• MPAndroidChart - An Android chart and graph library supporting scaling and dragging by gesture.

• RoboGuice - Dependency injection framework for Android.
• Dagger - Dependency injection framework for Java and Android.
• Butter Knife - View "injection" library for Android.
• AndroidAnnotations - Java annotations with dependency injection at compile time.

• AndEngine - Free, Fun and Fast Android 2D OpenGL Game Engine.
• Vuforia - Augmented Reality library.
• Unity - Cross-platform game creation system.
• Rajawali - Android OpenGL ES 2.0/3.0 Engine

• Pull to refresh - A swipe refresh layout is available in the v4 support library.
• Cardslib - Android Library to build a UI Card.
• AndroidStaggeredGrid - Grid view which supports multiple columns with rows of varying sizes.
• AQuery - Android-Query (AQuery) is a light-weight library for doing asynchronous tasks and manipulating UI elements in Android.
• Flow - Library that helps with describing an app as a collection of moderately independent screens.
• Crouton - Context sensitive notifications for Android
• DragSortListView - Extension of the Android ListView that enables drag-and-drop reordering (No longer maintained).
• MaterialProgressBar - Material design ProgressBar with consistent appearance.

• ActionBarSherlock - ActionBar for older Android versions.
• FadingActionBar - Fading action bar effect that can be seen in the new Play Music app.

• SlidingMenu - Library to create applications with slide-in menus.
• PagerSlidingTabStrip - An interactive indicator to navigate between the different pages of a ViewPager.
• Page View indicator - Support for horizontally scrolling ViewPager.
• MaterialDrawer - Simple take on a material design navigation drawer.

• NineOldAndroids - Library for using the Honeycomb animation API on all versions of the platform back to 1.0.
• Rebound - Rebound is a java library that models spring dynamics.
• Android View Animations - Cute view animation collection.

• android-crop - Library project for cropping images.
• CircularImageView - Custom view for circular images while maintaining the best draw performance.

• FloatingLabel - FloatingLabel Allows you to create a blow kind of EditText. Doesn't have Gradle or Maven Support.
• MaterialEditText - Supporting Floating Labels, Single Line Ellipsis, Max/Min Characters, Helper Text and Error Text with Custom Colors.
• Emojicon - Adds emoticons to your app

• Picasso - A powerful image downloading and caching library for Android.
• Universal Image Loader - Asynchronous, out of the box loading and caching of images.
• Glide - An image loading and caching library for Android focused on smooth scrolling,Recommended by google.
• Fresco - An Android library for managing images and the memory they use.

• Gson - Gson is a Java library used for serializing and deserializing Java objects from and into JSON.
• Jackson JSON Processor - High-performance JSON processor.

• Crashlytics - Easy crash reporting solution.
• HockeyApp - Distribution, Crash Reports, Feedback and Analytics
• Splunk MINT - Monitoring, Crash Reports, Real tima data, Statistic.
• Bugsnag - Cross platform error monitoring.

• Ion - Good networking library for android.
• OkHttp - An HTTP+SPDY client for Android and Java applications.
• Asynchronous Http Client - An Asynchronous HTTP Library.
• RoboSpice - Library that makes writing asynchronous network requests easy.
• IceNet - Fast, Simple and Easy Networking for Android
• Android Volley - Official Android HTTP library that makes networking for easier and faster.
• IceSoap - Easy, asynchronous, annotation-based SOAP for Android.
• node-android - Run Node.js on Android.

• Cupboard - Access the sqlite easily via direct database access or through the ContentProvider framework.
• DbInspector - Provides a simple way to view the contents of the in-app database for debugging purposes.
• Realm - The alternative to SQLite and ORMs: Simple, modern and fast! Object oriented API and multi platform support.
• RestorableSQLiteDatabase - A wrapper to replicate android's SQLiteDatabase with restoring capability.

• GreeDAO - Light & fast ORM solution.
• ORMLite - Lightweight ORM Java package for JDBC and Android.
• ActiveAndroid - Active record style ORM.
• Sugar ORM - Insanely easy way to work with Android Databases.

• Retrofit - Retrofit turns your REST API into a Java interface.

• Robotium - Test automation framework for black-box UI tests.
• Roboletric - Unit test framework to run tests inside the JVM on your workstation, not in the emulator.
• AssertJ Android - AssertJ assertions geared towards Android.

• MobileAppTracking - Tracking your marketing campaigns across multiple ad networks.
• Mixpanel - Analytics platform to analyze the users.

• EventBus - EventBus is a library that simplifies communication between different parts of your application.
• Otto - Event Bus for Android.
• Weak handler - Memory safer implementation of android.os.Handler.

• SmartGattLib - Simplifies the work with Bluetooth SMART devices (a.k.a. Bluetooth Low Energy in Bluetooth 4.0).

• Android Support library - The Android Support Library package is a set of code libraries that provide backward-compatible versions of Android framework API.
• Google Play Services - Library to access Google services, such as account syncing, Google+ (sharing, single sign-on), Google Maps, Location APIs, Google Play Games, Cloud Messaging, Android Device Manager, and others.
• Tape - A lightning fast, transactional, file-based FIFO for Android and Java.
• Android Annotation framework - Using Java annotations, developers can show their intent and let AndroidAnnotations generate the plumbing code at compile time.
• Guava: Google Core Libraries for Java - Collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and so forth.
• Android Scripting - Allows to run scripting languages on Android.
• Android Priority Job Queue - Implementation of a Job Queue to easily schedule jobs (tasks) that run in the background, improving UX and application stability.
• RateMeMaybe - Asks the user if (s)he wants to open the Play Store to rate your application.
• Easy Rating Dialog - Lib provides a simple way to display an alert dialog for rating app.
• ZXing Android-Integration - Integration with Barcode Scanner via Intent.
• Gradle Retrolambda Plugin - Java 8 Lambdas on Android!

• Vogella Tutorials - Very good tutorials by Lars Vogel.
• [Android Design in Action Video series] (https://www.youtube.com/playlist?list=PLWz5rJ2EKKc8j2B95zGMb8muZvrIy-wcF) The video series by Android Design Team of Google.
• [Android Design in Action slides] (https://play.google.com/store/apps/details?id=com.astuetz.android.adia&feature=md)- The application that gives you access to the slides of the video series.
• [Android DevBytes Video Series] (https://www.youtube.com/playlist?list=PLWz5rJ2EKKc_XOgcRukSoKKjewFJZrKV0) - It is the technical counterpart of Android Design in Action series.
• Developing for Android - A series of articles from Googler Chet Hasae and others, answering most commonly asked question: "What are some of the important rules to keep in mind when developing Android applications?".
• Android Hive Tutorials - Very good tutorials for beginners.
• Android Weekly - Newsletter with weekly information about android.
• Android Asset Studio - Generator for icons and other assets.
• Android Action Bar Style Generator.
• Device Art Generator - Wraps app screenshots in real device artwork.
• [Android UI design resources] (http://androiduiux.com/free-design-resources/) - Gives you wide variety of design resources form a Google Developer Expert in UI/UX.
• [Pencil Project] (http://pencil.evolus.vn/) - An open source prototyping software.
• Google Wear App - This is an open source Google Wear App that uses speech recognition to calculate a tip.
• How to Make Android Apps - Video tutorials by Derek Banas.
• android-blogs - List with blogs about Android.

• The Android Arsenal - Large list of android libraries
• DevAppsDirect - Demo Market - App that demonstrates different libraries.
• Square libraries - Multiple high quality libraries by square.
• Android.hew.io - Yet another list of android libraries.

My personal recommendation is (for now) to use the android api to build a native app. Scala can help to build this native apps with cleaner code. But there are also use cases where alternatives like cross-platform development can be useful.

• Xamarin - Framework to create native iOS, Android, Mac and Windows apps in C#.

• PhoneGap - Open source framework by Adobe to create cross platform mobile apps using HTML, CSS, and JavaScript.
• Titanium - Open-source framework to create 'native' cross platform apps using JavaScript.
• NativeScript - An open-source framework to build native iOS and Android apps with JavaScript from a single code base.
• React Native - A framework for building native apps with React by Facebook.
• Ionic Framework - A framework to build hybrid apps with mobile-optimized HTML, CSS and JS with AngularJS.
• Apache Cordova - Cordova based applications are, at the core, applications written with web technology: HTML, CSS and JavaScript.
• Reapp.io - Cordova based framework to build hybrid apps with mobile-optimized HTML, CSS and JS with ReactJS.

• Corona SDK - Framework to create native iOS and Android Apps (especially Games).

• Scala on Android - Introduction to Scala on Android.
• Scaloid - Library for less painful Android development with Scala.
• Macroid - A modular functional UI language for Android.

• Groovy on Android - Introduction to Groovy on Android.
• Groovy Language Support for Android - Gradle Plugin for Compiling Groovy for Android.
• SwissKnife - A multi-purpose Groovy library containing view injection and threading for Android using annotations.

• Anko - DSL for Android written in Kotlin by JetBrains.
• Kotterknife - Android view injection writen in Kotlin based on ButterKnife
• Android Kotlin Samples - Some basic Android code samples writen in Kotlin.

Other amazingly awesome lists can be found in the awesome-awesomeness list.

Your contributions are always welcome! Please read the contribution guidelines first.