Some useful libraries, samples, tools & Open Source apps for Android

Collection if libraries starred during some years of Android Development. Here is the definitely list of android Open Source libraries

* In titles means it has been categorized more than once (in different categories)

LIBRARIES

---

    UI
     |---Widgets
     |          |---TextView
     |          |---Button
     |          |---EditText
     |          |---ImageView
     |          |---ProgressBar
     |          |---ListView
     |          |---ViewPager
     |          |---SeekBar
     |          |---GridView
     |          |---ScrollView
     |          |---ActionBar
     |          |---Sliding Views
     |          |---Other
     |---Dialogs & Pickers
     |---Toasts
     |---Animation
     |          |---Parallax
     |          |---Other
     |---Maps
     |---Validation
     |---Camera
     |---Charts
     |---Other
    Location
    Social
    DB & Preferences
     |          |---ContentProvider / ContentResolver / Cursor
     |          |---Preferences
     |          |---Other

    IO
    Network
    Event Bus
    Tasks
    Open GL
    Dependency Injection
    Testing
    Reverse Engineering
    Bluetooth
    Scan
    File Pickers

EXAMPLES

---

    Network
    Tasks
    Dependency Injection

TOOLS

---

    Proguard
    Testing
    Log
    Localization

OPEN SOURCE APPS

---

    Camera
    P2P
    Chat
    Pedometer
    NFC
    Media
    Other

Libraries

UI

Widgets

TextView

Title	Description
AutoFit TextView	A TextView that automatically resizes text to fit perfectly within its bounds
Token AutoComplete	Gmail style MultiAutoCompleteTextView for Android
Android RobotoTextView	Implementation of a TextView and all its direct/indirect subclasses with native support for the Roboto fonts, includes the brand new Roboto Slab fonts
Android Ago	An Android TextView that always displays an auto refreshing relative time span with respect to a reference time
Timely TextView	Animated TextView like Timely app
Email AutoComplete TextView	An AutoCompleteTextView optimized for email auto-complete
Shimmer Android	An Android TextView with a shimmering effect
Titanic	Android experiment showing a sinking TextView
Blink TextView	Remember the '90s? Geocities? Blinking text? Dat. On Android
Secret TextView	A TextView that simulates the effect from the app Secret where the characters fade in/out at different speeds

Button

Title	Description
Android Process Button	Custom android button which can indicate progress

EditText

Title	Description
Float Label EditText	Floating hint from edit text
EditText Mentions	EditText subclass with mentions detection (like Facebook or Twitter)
History EditText	Android EditText that auto-saves previous values and displays them in a dropdown when used again
Single Input Form	A single EditText instead of a classical form

ImageView

Title	Description
Ken Burns View	Android ImageViews animated by Ken Burns Effect
PhotoView	Implementation of ImageView for Android that supports zooming, by various touch gestures
Circle ImageView	A circular ImageView for Android
Custom Shape ImageView	Custom shape ImageView using PorterDuffXfermode with paint shapes and SVGs
Rounded ImageView	a fast ImageView that supports rounded corners and ovals or circles
Flip ImageView	Small android lib allowing you to make a flip imageview easily, by extending FlipImageView
Glide	An image loading and caching library for Android focused on smooth scrolling
Circular ImageView	Custom view for circular images in Android while maintaining the best draw performance

ProgressBar

Title	Description
Android Holo Circular ProgressBar	is a Custom View implementation for Android you might know from the Android Clock
Google ProgressBar	Android library to display progress like google does in some of his services
Smooth ProgressBar	A small Android library allowing you to have a smooth and customizable horizontal indeterminate ProgressBar
Progress Wheel	A progress wheel for android, intended for use instead of the standard progress bar
Number ProgressBar	A more beautiful, slim, sexy Android progressbar
Android Process Button *	Custom android button which can indicate progress

ListView

Title	Description
Flabby ListView	Android library to display a ListView which cells are not rigid but flabby and react to ListView scroll and touch events
Dob List	DobLis is an Open Source Android library that provides to ListView adding ProgressBar (or any view) to the footer of ListView to be shown in loading more, and callback that is called when reaching last item in ListView
Android Swipe ListView	An Android List View implementation with support for drawable cells and many other swipe related features
Multi Choice Adapter	A ListView adapter with support for multiple choice modal selection
Jazzy ListView	JazzyListView is an extension of ListView designed to animate list item views as they become visible
ListView Animations	An Android library which allows developers to easily add animations to ListView items
Slide Expandable ListView	A better ExpandableListView, with animated expandable views for each list item
Swipe ListView	An Android List View implementation with support for drawable cells and many other swipe related features
Super ListView	Way more than just a listview

ViewPager

Title	Description
Jazzy ViewPager	An easy to use ViewPager that adds an awesome set of custom swiping animations. Just change your ViewPagers to JazzyViewPagers, two more steps, and you're good to go!
Android ViewPager Indicator	Paging indicator widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock
Salvage	Generic view recycler and ViewPager PagerAdapter implementation
Android Auto Scroll ViewPager	auto scroll ViewPager or ViewPager in ViewPager. http://www.trinea.cn/
Pager Sliding Tab Strip	An interactive indicator to navigate between the different pages of a ViewPager
Numeric Page Indicator	A ViewPager page indicator that displays the current page number and (optionally) the page count
Wizard Pager	Wizard Pager is a library that provides an example implementation of a Wizard UI on Android, it's based of Roman Nurik's wizard pager (https://code.google.com/p/romannurik-code/source/browse/misc/wizardpager)
ViewPager Transformations	Library containing common animations needed for transforming ViewPager scrolling for Android v13+

SeekBar

Title	Description
Start Point SeekBar	StartPointSeekBar is a custom view for the Android platform that makes it possible to have a SeekBar to have custom start point

GridView

Title	Description
Asymmetric GridView	Crazy-ass Android GridView with asymmetric items
Sticky Grid Headers	An Android Library that makes it easy to make grid views with sectioned data and headers that stick to the top. http://tonicartos.github.io/StickyGridHeaders/

ScrollView

Title	Description
Discroll View	Scroll + discover = DiscrollView

ActionBar

Title	Description
Not Boring ActionBar	News Stand app makes the ActionBar not boring!
Glass ActionBar	A library that adds a glass-like effect to the action bar
Fading ActionBar	Android library implementing a fading effect for the action bar, similar to the one found in the Play Music app
ActionBar PullToRefresh	A modern implementation of the pull-to-refresh interaction for #android
Refresh Action Item	An action bar item which acts both as a refresh button and as a progress indicator

Sliding Views

Title	Description
Android Sliding Up Panel	This type of a panel is a common pattern also used in the Google Music app and the Rdio app
DobSliding	DobSliding is an Open Source Android library that allows developers to develop applications with vertical sliding menus just like the Android notifications menu
Android Menu Drawer	A slide-out menu implementation, which allows users to navigate between views in your app. http://simonvt.github.com/android-menudrawer/
Sliding Menu	An Android library that allows you to easily create applications with slide-in menus
Side Navigation	Implementation of "SIde Navigation" or "Fly-in app menu" pattern for Android (based on Google+ app). http://johnkil.github.com/SideNavigation

Other

Title	Description
Android FlipView	A small, easy to use android library for implementing flipping between views as seen in the popular Flipboard application
Android Flip	A component for flip animation on Android, which is similar to the effect in Flipboard iPhone/Android
Android PDF View	A fast PDF reader component for Android development
Android ViewBadger	A simple way to "badge" any given Android view at runtime without having to cater for it in layout
Quilt View Library	QuiltView displays views of different sizes in a scrollable grid
FreeFlow	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 animations as data and layouts change
Draggable Panel	Android library used to create an awesome Android UI based on a draggable element similar to the last YouTube graphic component
Android Reside Menu	The idea of ResideMenu is from Dribbble 1 and 2. It has come true and run in iOS devices. iOS ResideMenu This project is the RefsideMenu Android version. The visual effect is partly referred to iOS version of ResideMenu
ShowCase View	Highlight the best bits of your app to users quickly, simply, and cool. http://amlcurran.github.io/ShowcaseView/
Foldable Layout	Android widgets to implement folding animation
Image Layout	Android - A layout that arranges its children in relation to a background image
Swipeable cards	A native library providing a Tinder-like cards effect. A card can be constructed using an image and displayed with animation effects, dismiss-to-like and dismiss-to-unlike, and use different sorting mechanisms

Dialogs & Pickers

Title	Description
Update Checker	Increase your app's updates
Android Style Dialogs	A simple library for styling Android dialogs in the Holo theme. It also removes boilerplate code for displaying simple dialogs
DateTime Picker	DateTimePicker is a library which contains the beautiful DatePicker that can be seen in the new Google Agenda app
Recurrence Picker	Google Calendar Recurrence picker

Toasts

Title	Description
Android AppMsg	In-layout notifications. Based on Toast notifications and article by Cyril Mottier (http://android.cyrilmottier.com/?p=773)
Super Toasts	A library that extends the Android toast framework
Message Bar	An Android Toast replacement, similar to the one seen in the GMail app. http://simonvt.github.com/MessageBar/
Undo Bar	The UI component for Android advanced UI pattern undo-bar, used in Gmail app, create by Roman Nurik. http://soarcn.github.io/UndoBar

Animation

Parallax

Title	Description
Motion	An Android library allowing images to exhibit a parallax effect
Parallax Pager	Add some depth to your Android scrolling

Other

Title	Description
Android Sliding Up Panel *	Android Sliding Up Panel Demo
Android FlipView *	A small, easy to use android library for implementing flipping between views as seen in the popular Flipboard application
Android Flip *	A component for flip animation on Android, which is similar to the effect in Flipboard iPhone/Android
Flabby ListView *	Android library to display a ListView which cells are not rigid but flabby and react to ListView scroll and touch events
FreeFlow *	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 animations as data and layouts change
Ken Burns View *	Android ImageViews animated by Ken Burns Effect
Draggable Panel *	Android library used to create an awesome Android UI based on a draggable element similar to the last YouTube graphic component
DobSliding *	DobSliding is an Open Source Android library that allows developers to develop applications with vertical sliding menus just like the Android notifications menu
Jazzy ListView *	JazzyListView is an extension of ListView designed to animate list item views as they become visible
ListView Animations *	An Android library which allows developers to easily add animations to ListView items
Slide Expandable ListView *	A better ExpandableListView, with animated expandable views for each list item
Sticky List Headers	An android library for section headers that stick to the top
Android ScrollBar Panel	Android ScrollBarPanel allows to attach a View to a scroll indicator like it's done in Path 2.0
Foldable Layout *	Android widgets to implement folding animation
Animation Easing Functions	Android Animation Easing Functions. Let's make animation more real!
Android View Animations	Cute view animation collection

Maps

Title	Description
Clusterer	Clustering in Maps v2 for Android

Validation

Title	Description
Android Saripaar	UI Validation Library for Android

Camera

Title	Description
Easy Camera	Wrapper around the android Camera class that simplifies its usage
Landscape Video Camera	Powerful custom Android Camera with granular control over the video quality and filesize, restricting recordings to landscape only.

Charts

Title	Description
Eaze Graph	An Android chart and graph library
WilliamChart	Flexible charting library with nice motion capabilities
MPAndroidChart	An Android chart and graph library supporting scaling and dragging by gesture

Other

Title	Description
Shake Detector	This library provides a easy way to detect a shake movement using the build-in accelerometer and fire a callback on the UI thread every times it happens
Android Face Cropper	Android bitmap Face Cropper

Location

Title	Description
Fluffy	Battery-friendly background location updates for Android, using Google Play Location where available
Fused Location	This project aims to bring the Fused location provider to android apps without requiring the Play Services library
Reactive Location	Small library that wraps Google Play Service API in brilliant RxJava Observables reducing boilerplate to minimum

Social

Title	Description
Twitter 4J	Twitter4J is an open-sourced, mavenized and Google App Engine safe Java library for the Twitter API
Twitter Android SDK	Twitter SDK for Android, using Twitter4j
Facebook Android SDK	Use the Facebook SDK for Android to integrate with Facebook, help build engaging social apps
Android Social Networks	Library for easy work with Facebook, Twitter, LinkedIn and Google on Android

DB & Preferences

ContentProvider / ContentResolver / Cursor

Title	Description
Android DB Commons	Some common utilities for ContentProvider/ContentResolver/Cursor and other db-related android stuff
Schematic	Automatically generate ContentProviders
Android Content Provider Generator	A small tool to generate an Android ContentProvider

Preferences

Title	Description
Esperandro	Easy SharedPreference Engine for Android
Secure Preferences	Android SharedPreference wrapper that encrypts keys and values of Shared Preferences. It's not bullet proof security but rather a quick win for incrementally making your android app more secure
AES Secure Preferences	Secure AES Encryiption decorated Android Shared Preferences implementation

Other

Title	Description
Snappy DB	A key-value database for Android
Cupboard	Cupboard for Android is simple persistence that gets out of your way and is easy to add to your existing code base
Android SQLite Asset Helper	An Android helper class to manage database creation and version management using an application's raw asset files
Sprinkles	Sprinkles is a boiler-plate-reduction-library for dealing with databases in android applications
Sugar	Insanely easy way to work with Android Database. http://satyan.github.com/sugar/

IO

Title	Description
Conceal	Conceal provides easy Android APIs for performing fast encryption and authentication of data, such as that stored on SD cards. http://facebook.github.io/conceal/

Network

Title	Description
Merlin	Observes network connection status & gives callbacks
Robospice	RoboSpice is a modular android library that makes writing asynchronous long running tasks easy. It is specialized in network requests, supports caching and offers REST requests out-of-the box using extension modules
Android Volley	Android Volley Mirror
Retrofit	Type-safe REST client for Android and Java by Square, Inc
OkHttp	An HTTP+SPDY client for Android and Java applications
KSOAP 2 Android	Lightweight and efficient SOAP client library for the Android platform
Android Async Http	An Asynchronous HTTP Library for Android
Android SSL TrustKiller	Bypass SSL certificate pinning for most applications

Event Bus

Title	Description
Otto	An enhanced Guava-based event bus with emphasis on Android support.
http://square.github.io/otto/
EventBus	Android optimized event bus that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality

Tasks

Title	Description
Robospice *	RoboSpice is a modular android library that makes writing asynchronous long running tasks easy. It is specialized in network requests, supports caching and offers REST requests out-of-the box using extension modules
Bolts Android	Bolts is a collection of low-level libraries designed to make developing mobile apps easier

Open GL

Title	Description
Android Page Curl	An example application for creating page curl/flip effect on Android using OpenGL ES

Dependency Injection

Title	Description
Butterknife	View "injection" library for Android

Testing

Title	Description
Robotium	Like Selenium, but for Android
Spoon	Distributing instrumentation tests to all your Androids
Fest Android	A set of FEST assertion helpers geared toward testing Android
Double Espresso	A pure Gradle port of the Espresso testing utility for Android

Reverse Engineering

Title	Description
JadX	Dex to Java decompiler

File Pickers

Title	Description
NoNonSense File Picker	A file/directory-picker for android. Implemented as a library project

Bluetooth

Title	Description
Android Bluetooth SPP	Bluetooth Serial Port Profile which comfortable to developer application to communication with microcontroller via bluetooth

Scan

Title	Description
ZXing	Official ZXing ("Zebra Crossing") project home
ZXing Android Minimal	Port of the ZXing Android application as a minimal Android library project, for embedding in other Android applications
ZXing Fragment	Barcode scanner for Android fragments. Compatible with Android 2.1+
Barcode Scanner	Barcode Scanner Libraries for Android

Samples

Network

Title
Robospice Samples

Tasks

Title
Robospice Samples *

Dependency Injection

Title
Android Dagger Example

Tools

Proguard

Title	Description
Facebook Proguard	A faster fork of ProGuard. Based off of ProGuard 4.11 (http://sourceforge.net/p/proguard/code/ci/proguard4.11/tree/)

Testing

Title	Description
Quality Tools for Android	This is an Android sample app + tests that will be used to work on various project to increase the quality of the Android platform

Log

Title	Description
Hugo	Annotation-triggered method call logging for your debug builds
Phone Home	PhoneHome is a standalone library that sends logs from remote Android devices to a central server for debugging. PhoneHome requires nothing of end users
Timber	A logger with a small, extensible API which provides utility on top of Android's normal Log class. http://jakewharton.github.io/timber/
Debug Log	Create a simple and more understandable Android logs

Localization

Title	Description
DexterApps Translation Util	Automatic String Translation Utility for Android and iOS

Open Source Apps

Camera

Title	Description
PhotoUp

P2P

Title	Description
Transdroid	Manage your torrents from your Android device

Chat

Title	Description
Conversations	Conversations is an open source XMPP (formally known as Jabber) client for Android 4.0+ smart phones
Text Secure	A secure text messaging application for Android

Pedometer

Title	Description
Step Counter	A Step Counter for Android KitKat devices with Built-in Pedometers

NFC

Title	Description
Farebot	Read data from public transit cards using your NFC Android phone!

Media

Title	Description
Mizuu	Popular media indexer app for Android. http://mizuu.tv
Exo Player	Google Media Player Open Source project

Other

Title	Description
Financius	Personal expense manager
Gaug.es Android	Gaug.es Android App
White House Android	White House application for Android
Ac Display	AcDisplay is a new way of handling notifications in Android. http://acdisplay.artemchep.com
Google I/O	Google I/O application
Wordpress Android	WordPress for Android. http://android.wordpress.org
One Bus Away	The official Android app for OneBusAway.
http://www.onebusaway.org/