The goal of this project is to provide a hand-picked collection of Android libraries, tools, open-source projects, books, blogs, tutorials - you name it.

This project will try to showcase only the best, most popular and well-tested resources that you will actually need and find useful rather than overwhelming you with a plethora of low-quality ones.

Happy learning. 👍

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Contribution Guide

This project is open to all kinds of contribution in all of its categories. Together, we can make it the ultimate Android reference available for free, for everyone, forever.

For resource contribution, just follow the following format: [reference-name](link) - Description, and raise a Pull Request. If you want to contribute multiple resources, raise separate PRs for each of them. Please consider adding resources maintaining the default sorting order of the category, like alphabetical sorting.

If you have any suggestion for including more categories, feel free to open a Github issue for us to have more discussion on it. Please DO NOT contribute low-quality, spammy or self-promotional stuff. Let's keep this project clean and useful.

If you feel that a particular resource(s) listed here is not a good fit for this project and should be removed, feel free to let me know by opening an issue.

Libraries

These are some of the best and the most popular libraries and utilities to boost up your Android development. This list is divided into several essential categories and only includes resources which have been battle-tested by a variety of developers over a long time.

Animations

AndroidAdditiveAnimations - Additive animations for Android!
AndroidRippleBackground - A beautiful ripple animation
AndroidViewAnimations - Cute view animation collection
Backboard - A motion-driven animation framework for Android
Bubble-Picker - An easy-to-use animation which can be used for content picking for Android
ExpectAnim - Describe your animation and run
Grav - Configurable animations based on points
Lottie - Render After Effects animations natively on Android and iOS
Rebound - A Java library that models spring dynamics and adds real world physics to your app
RichPath - 💪 Rich Android Path. 🤡 Draw as you want. 🎉 Animate much as you can
Spruce - Spruce Animation Library
TestButler - Reliable Android Testing, at your service
ViewAnimator - A fluent Android animation library

Background Processing

Android Priority Job Queue - A Job Queue specifically written for Android to easily schedule jobs (tasks) that run in the background, improving UX and application stability
Evernote Android Job - Android library to handle jobs in the background

Charts

EazeGraph - An Android chart and graph library
HelloCharts - Charts/graphs library for Android compatible with API 8+, several chart types with support for scaling, scrolling and animations
MPAndroidChart - A powerful Android chart view / graph view library, supporting line-bar-pie-radar-bubble-and candlestick charts as well as scaling, dragging and animations
Spark - A simple Android sparkline chart view
WilliamChart - Android library to create charts

Crash Reporting & Tracking

Bugsee - Flight recorder for your iOS and Android apps
Bugsnag - Monitor application errors to improve customer experiences and code quality
CleverTap - A complete tool to track and analyze user activity in your Android app
Countly - End-to-end platform for web, mobile applications and game analytics
Fabric Crash Analytics - Fabric is a platform that helps your mobile team build better apps, understand your users, and grow your business
Firebase Crash Reporting - Google Firebase Crash Reporting for iOS and Android. It creates detailed reports of the errors in your app, groups them into issues based on having similar stack traces, and tagged by the severity of impact on your users
HockeyApp - Bring Mobile DevOps to your apps with beta distribution, crash reporting, user metrics, feedback, and powerful workflow integrations
InstaBug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting
MixPanel - Deeply understand every user's journey with instant insights for everyone on mobile and web

Debugging

Android Debug Database - A library for debugging Android databases and shared preferences
Android Performance Monitor - A transparent ui-block detection library for Android (known as BlockCanary)
Chuck - An in-app HTTP inspector for Android OkHttp clients
Debug Drawer - Android Debug Drawer for faster development
Hyperion - App Debugging & Inspection Tool for Android
LeakCanary - A memory leak detection library for Android and Java
Stetho - Stetho is a debug bridge for Android applications, enabling the powerful Chrome Developer Tools and much more
Takt - Takt is Android library for measuring the FPS using Choreographer

Dependency Injection

Butterknife - Bind Android views and callbacks to fields and methods
Dagger - A fast dependency injector for Android and Java
Dagger 2 - A fast dependency injector for Android and Java
Dart - Extras "injection" library for Android

Image Loading

Android Universal Image Loader - Powerful and flexible library for loading, caching and displaying images on Android
Coil - An image loading library for Android backed by Kotlin Coroutines.
Fresco - An Android library for managing images and the memory they use
Glide - An image loading and caching library for Android focused on smooth scrolling
Picasso - A powerful image downloading and caching library for Android

Image Processing

Android GPU Image - Android filters based on OpenGL (idea from GPUImage for iOS)
Fresco Processors - An Android image processor library providing a variety of image transformations for Fresco
Glide Face Detection Transformation - An Android image transformation library providing cropping above Face Detection (Face Centering) for Glide
Glide Transformations - An Android transformation library providing a variety of image transformations for Glide
PhotoFiltersSDK - AndroidPhotoFilters aims to provide fast, powerful and flexible image processing instrument for creating awesome effects on any image media
Picasso Face Detection Transformation - An Android image transformation library providing cropping above Face Detection (Face Centering) for Picasso
Picasso Transformations - An Android transformation library providing a variety of image transformations for Picasso
Pollexor - An Android library, that can download unencrypted and encrypted images, crop, resize, apply filters and convert to another format.

Logging

Hugo - Annotation-triggered method call logging for your debug builds
Logger - Simple, pretty and powerful logger for Android
LoggingInterceptor - An OkHttp interceptor which pretty logs request and response data
Timber - A logger with a small, extensible API which provides utility on top of Android's normal Log class

Networking

Fast Android Networking - A Complete Fast Android Networking Library that also supports HTTP/2
Ion - Android Asynchronous Networking and Image Loading
OkHttp - An HTTP+HTTP/2 client for Android and Java applications
OkDownload - A Reliable, Flexible, Fast and Powerful download engine
PRDownloader - A file downloader library for Android with pause and resume support
Retrofit - Retrofit turns your REST API into a Java interface
Scarlet - A Retrofit inspired WebSocket client for Kotlin, Java, and Android
Volley - Volley is an HTTP library that makes networking for Android apps easier and most importantly, faster

Persistence

ActiveAndroid - Active record style SQLite persistence for Android
DBFLow - A blazing fast, powerful, and very simple ORM Android database library that writes database code for you
Firebase Realtime Database - Store and sync data with our NoSQL cloud database. Data is synced across all clients in realtime, and remains available when your app goes offline
greenDAO - greenDAO is a light & fast ORM solution for Android that maps objects to SQLite databases
ObjectBox - superfast object-oriented database with strong relation support. ObjectBox is embedded into your Android, Linux, macOS, or Windows app
Paper - Fast and simple data storage library for Android
Realm - Realm is a mobile database: a replacement for SQLite & ORMs
Room - Room provides an abstraction layer over SQLite to allow fluent database access while harnessing the full power of SQLite
RxCache - Reactive caching library for Android and Java
StorIO - Beautiful API for SQLiteDatabase and ContentResolver
SQL Brite - A lightweight wrapper around SQLiteOpenHelper which introduces reactive stream semantics to SQL operations

Testing

AssertJ - AssertJ is a library providing easy to use rich typed assertions
AssertJ Android - A set of AssertJ helpers geared toward testing Android
Cucumber - A sweeter Espresso. Never write your own IdlingResource again. Never manually turn off system animations again
Composer - Reactive Android Instrumentation Test Runner
DaggerMock - A JUnit rule to easily override Dagger 2 objects
Espresso - Write easy, simple and human-readable UI tests on Android
Hamcrest - Java (and original) version of Hamcrest
JaCoCo - JaCoCo - Java Code Coverage Library
JUnit4 - A programmer-oriented testing framework for Java
Mockito - Most popular Mocking framework for unit tests written in Java
MockK - Mocking library for Kotlin
OkReplay - 📼 Record and replay OkHttp network interaction in your tests
Robolectric - Android Unit Testing Framework
Robotium - Android UI Testing
RxIdler - An IdlingResource for Espresso which wraps an RxJava Scheduler
RxPresso - Easy Espresso UI testing for Android applications using RxJava
Selendroid - Selendroid is a test automation framework which drives of the UI of Android native and hybrid applications (apps) and the mobile web with Selendroid
Truth - Assertion/Proposition framework for Java unit tests

UI Components

AdaptiveTableLayout - Library that makes it possible to read, edit and write CSV files
Alerter - A customisable notification view
Android SpinKit - Android loading animations
BlurDialogFragment - Library project to display DialogFragment with a blur effect
BlurKit Android - The missing Android blurring library. Fast blur-behind layout that parallels iOS
BottomBar - A custom view component that mimics the new Material Design Bottom Navigation pattern
BottomSheet - Android component which presents a dismissible view from the bottom of the screen
Cafebar - An upgraded Snackbar for Android that provides more options and easy to use
CircleImageView - A circular ImageView for Android
Cyanea - A theme engine for Android
DiagonalLayout - With Diagonal Layout explore new styles and approaches on material design
DialogPlus - Advanced dialog solution for Android
Epoxy - Epoxy is an Android library for building complex screens in a RecyclerView
ExoPlayer - An extensible media player for Android
FabulousFilter - Library to easily implement FAB to BottomSheetDialog animation
FirebaseUI for Android - UI Bindings for Firebase
Flashbar - A highly customizable, powerful and easy-to-use alerting library for Android
Flexbox Layout - FlexboxLayout is a library project which brings the similar capabilities of CSS Flexible Box Layout Module to Android
JazzyViewPager - 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
Litho - A declarative framework for building efficient UIs on Android
Material Dialogs - A beautiful, fluid, and customizable dialogs API
Material Drawer - The flexible, easy to use, all in one drawer library for your Android project
Material Search View - Cute library to implement SearchView in a Material Design Approach
Matisse - A well-designed local image and video selector for Android
Paris - Define and apply styles to Android views programmatically
PhotoView - Implementation of ImageView for Android that supports zooming, by various touch gestures
Remixer - Remixer is a framework to iterate quickly on UI changes by allowing you to adjust UI variables without needing to rebuild (or even restart) your app. You can adjust Numbers, Colors, Booleans, and Strings.
Subsampling Scale ImageView - Highly configurable, easily extendable view with pan and zoom gestures for displaying huge images without loss of detail. Perfect for photo galleries, maps, building plans etc.
ShimmerLayout - Memory efficient shimmering effect for Android applications by Supercharge
TapTargetView - An implementation of tap targets from the Material Design guidelines for feature discovery
Toasty - The usual Toast, but with steroids
VectorMaster - Dynamic control over vector drawables
VLayout - Project vlayout is a powerful LayoutManager extension for RecyclerView, it provides a group of layouts for RecyclerView

Utilities

Aesthetic - A fast and easy to use plug-and-play dynamic theme engine. Powered by Rx, for Android apps
Alligator - Alligator is a modern Android navigation library that will help to organize your navigation code in clean and testable way
AndroidUtilCode - 🔥 Android developers should collect the following utils(updating)
Android Annotations - Fast Android Development. Easy maintainance
Android Crop - Android library project for cropping images
Android In-App Billing V3 - A lightweight implementation of Android In-app Billing Version 3
Android Saripaar - UI form validation library for Android
Android Weak Handler - Memory safer implementation of android.os.Handler
Ason - JSON in Java made easy! Catch less exceptions, serialize/deserialize with ease, plus some other useful tricks and conveniences
BillingX - Extension to the Billing Support library to support debug builds
ByteBuddy - Byte Buddy is a code generation and manipulation library for creating and modifying Java classes during the runtime of a Java application
Calligraphy - Custom fonts in Android the easy way
Cropiwa - The library which is highly configurable for image cropping.
DeepLinkDispatch - A simple, annotation-based library for making deep link handling better on Android
EasyDeviceInfo - Get device information in a super easy way
Easy Permissions - Simplify Android M system permissions
Fotoapparat - Making Camera for Android more friendly
Gson - A Java serialization/deserialization library to convert Java Objects into JSON and back
Guava - Google Core Libraries for Java
IcePick - Android Instance State made easy
JSoup - Java HTML Parser, with best of DOM, CSS, and jquery
LibPhoneNumber - Google's common Java, C++ and JavaScript library for parsing, formatting, and validating international phone numbers
Moshi - A modern JSON library for Android and Java
Nanoscope - An extremely accurate Android method tracing tool
Parceler - Android Parcelables made easy through code generation
PermissionsDispatcher - Simple annotation-based API to handle runtime permissions
ProtoBuf - Protocol Buffers - Google's data interchange format
Register - Android Library and App for testing Play Store billing
Reprint - A unified fingerprint library for Android
Secure Preferences - Android Shared preference wrapper than encrypts the values of Shared Preferences
Sensey - Detecting gestures in a snap
Store - Android Library for Async Data Loading and Caching
uCrop - Image Cropping Library for Android

Utilities (Advanced)

AutoDispose - Automatic binding+disposal of RxJava 2 streams
Android KTX - A set of Kotlin extensions for Android app development
Domic - Reactive Virtual DOM for Android
EventBus - Android optimized event bus that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality
JavaPoet - A Java API for generating .java source files.
Lightweight Stream API - Stream API from Java 8 rewritten on iterators for Java 7 and below
Mosby - A Model-View-Presenter / Model-View-Intent library for modern Android apps
MvRx - MvRx: Android on Autopilot
Optional - Java 8 Optional-like APIs for everyone
RetroLambda - A Gradle plugin for getting Java lambda support in Java 6, 7 and android
RxAndroid – This module adds the minimum classes to RxJava that make writing reactive components in Android applications easy and hassle-free. More specifically, it provides a Scheduler that schedules on the main thread or any given Looper.
RxBinding - RxJava binding APIs for Android's UI widgets
RxJava - RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM
RxJava2Interop - Library to convert between RxJava 1.x and 2.x reactive types
RxLifecycle - Lifecycle handling APIs for Android apps using RxJava
RxLint - rxlint is a set of lint checks that check your RxJava code. There are currently three checks
RxRelay - RxJava types that are both an Observable and a Consumer
Slick - A Reactive MVP Framework which is Slick to use
Traceur - Easier RxJava2 debugging with better stacktraces

Open-Source Apps

There are lots of open-source apps available in the Android community for developers to learn from, but it becomes very difficult to find the ones which are actually worth your time and can help you learn a lot of things. This list (loosely categorized on the basis of your Android skills) can help you find the resource you always wanted.

Beginner

KISS - Lightning fast, open-source, < 200kb Android launcher
Materialize - Materialize all those not material
MinimalTodo - Material To-Do App
PhotoAffix - Stitch your photos together vertically or horizontally easily!
Simple Gallery - A gallery for viewing photos and videos without ads
SoundRecorder - A simple sound recording app implementing Material Design

Intermediate

ChangeDetection - Automatically track websites changes on Android in background
ClipStack - A tiny clipboard history manager app
EverMemo - Fast Record,Organize,and Share. The Android memo app you will deeply love
FastHub - GitHub client for Android
Google I/O App - The Google I/O 2016 Android App
InstaMaterial - Implementation of Instagram with Material Design (originally based on Emmanuel Pacamalan's concept)
LeafPic - LeafPic is an ad-free, open-source and material-designed Android gallery alternative
MLManager - A modern, easy and customizable app manager for Android with Material Design
MovieGuide - Movie discovery app showcasing MVP, RxJava, Dagger 2 and Clean Architecture. Popcorn?
Narrate -Narrate is a beautiful and functional open source journal for Android
Plaid - An Android app which provides design news & inspiration as well as being an example of implementing material design
Protein - 🏀 An Android App for Dribbble
Robot Scouter - 🤖 A scouting app for FIRST Robotics Competition teams
ToolWizAppLock - Smart App Lock for Android
Turbo Editor - Simple and powerful File Editor for Android
WeGit - An Android App for Github

Expert

AmazeFileManager - Amaze File Manager source code
AntennaPod - A podcast manager for Android
CatchUp - An app for catching up on things
CoCoin - CoCoin, Multi-view Accounting Application
Conversations - A federated Instant Messaging app for Android (XMPP/Jabber)
Kickstarter - Kickstarter for Android. Bring new ideas to life, anywhere
LibreTorrent - Free as in Freedom torrent client for Android
MusicDNA - A Music Player for Android that renders beautiful DNA(Visualization) of the currently playing music
Muzei Wallpaper - Muzei Live Wallpaper for Android
OmniNotes - Open source note-taking application for Android
QkSms - The most beautiful SMS messenger app for Android
RedReader - An unofficial open source Reddit client for Android
Signal - A private messenger for Android
SuperCleanMaster - CleanMaster like open-source app
Talon for Twitter - 100% open source version of my popular Talon for Twitter app on Android
Talon for Twitter (Material Design) - The Material Design version of my popular Android Talon for Twitter app, 100% open-source
Telegram - Telegram for Android source
Timber - Material Design Music Player
TimberX - Material theme music player that works across all form factors (phones, wear, auto, cast, assistant) and uses latest tools (Kotlin, Architecture components, Room, Databinding)

Tools

"A craftsman is only as good as his tools" - to level up your Android development workflow you need to have the right tools always ready in your toolbox. This list is here to provide you with hand-picked tools to significantly improve your Android development life.

Free

ADB IDEA - A plugin for Android Studio and Intellij IDEA that speeds up your day to day Android development
Android Asset Studio - A collection of tools to easily generate assets such as launcher icons for your Android app
Android Starters - Android starter based on MVP/Dagger2/RxJava2/Robolectric/Espresso/Mockito. It provides a generator to fast create a Android template project
Android Tool for Mac - One-click screenshots, video recordings, app installation for iOS and Android
Android Translator - A web-based tool to quickly and easily create translations for your Android app
Android Wifi ADB - IntelliJ/AndroidStudio plugin which provides a button to connect your Android device over WiFi to install, run and debug your applications without a USB connected
APK DeGuard - DeGuard reverses the process of obfuscation performed by Android obfuscation tools. This enables numerous security analyses, including code inspection and predicting libraries
APK Patch Size Estimator - Estimates the size of Google Play patches and the new gzipped APK
Battery Historian - Battery Historian is a tool to analyze battery consumers using Android "bugreport" files
Buck - A fast build system that encourages the creation of small, reusable modules over a variety of platforms and languages
Butterknife Zelezny - Android Studio plug-in for generating ButterKnife injections from selected layout XML
Build Time Tracker - Gradle plugin to continuously track and report your build times
Carbon - Create and share beautiful images of your source code
CheckStyle IDEA - This plugin provides both real-time and on-demand scanning of Java files with CheckStyle from within IDEA
ClassyShark - Android executables browser
CodeGlance - Embeds a code minimap similar to the one found in Sublime into the editor pane. Works with both light and dark themes using your customized colors for syntax highlighting
Codota - Supercharge your development workflow by getting great code examples directly in your IDE. The Codota plugin for IntelliJ lets you quickly find the best code examples for every API class or method
Dagger IntelliJ Plugin - An IntelliJ IDEA plugin for Dagger which provides insight into how injections and providers are used
Detekt - Static code analysis for Kotlin
DevKnox - Autocorrect Security Issues As You Write Code
Dex Count Gradle Plugin - A Gradle plugin to report the number of method references in your APK on every build
Dex Method Counts - Command-line tool to count per-package methods in Android .dex files
DTO Generator - Data Transfer Object(DTO) generator that generates Java classes from the given feed
DPI Love - Get accurate DPI information on a wide range of Android devices
Drawable Optimizer - Gradle plugin to optimize png files and reduce resultant apk size within an Android project
Dry Run - Try any Android library hosted online directly from the command line
FindBugs - Powerful static code analysis tool for Java and Android
FlatIcon - The largest database of free icons available in PNG, SVG, EPS, PSD and BASE 64 formats
Gradle Please - Quick and easy way to build Gradle based libraries in Android
Gradle Profiler - A tool for gathering profiling and benchmarking information for Gradle builds
Infer - A static analyzer for Java, C, C++, and Objective-C
JSONBlob - JSON Blob is a web-based tool to create, edit, view, format, and share JSON
JSONSchema2POJO - Easy and quick way to convert your JSON to Java objects
KeyPromoter - Shows to user how easy he can make same action using only keyboard(menus and toolbar button mouse clicks initiates shortcut display)
KtLint - An anti-bikeshedding Kotlin linter with built-in formatter
Ligaturizer - Programming Fonts with Ligatures added (& a script to add them to other fonts)
Material Design Icon Generator - This plugin help you to set material design icon to your project
Material Palette - Generate Material Design color palettes quickly and easily
Methods Count - Your solution for a perfectly fit APK
Mocky.IO - Mock your HTTP responses to test your REST API
Name That Color - This plugin lets you insert a name for a color you copy-paste or type in an android resource file
OkBuck - OkBuck is a gradle plugin that lets developers utilize the Buck build system on a gradle project
Pidcat - Colored logcat script which only shows log entries for a specific application package
RESTMock - HTTP Server for Android Instrumentation tests
Scalpel - A surgical debugging tool to uncover the layers under your app
Scrcpy - Display and control your Android device
Shape Shifter - Useful tool for creating simple path morphing AnimatedVectorDrawables
Slides Code Highlighter - A nifty tool to turn your boring pieces of code into beautifully highlighted code snippets
Sonar - A desktop debugging platform for mobile developers
SonarLint - SonarLint is an IntelliJ IDEA plugin that provides on-the-fly feedback to developers on new bugs and quality issues injected into Java
Spotless - Keep your code spotless
SourceTree - Harness the power of Git and Hg in a beautifully simple application
String Manipulation - Provides actions for text manipulation such as toggle, capitalize, encode/decode, etc
SVG2VectorDrawable Plugin - Tools for convert SVG file to Android VectorDrawable
WireMock - A tool for mocking HTTP services

Free (+ Pro)

Crowdin - Translate and manage the process better, faster, and smarter
GenyMotion - A unique platform to bring your Android app to perfection!
GitKraken - The most popular Git GUI for Windows, Mac AND Linux
IDE Scout - SQLScout is a plugin for Android Studio and IntelliJ IDEA that provides powerful, dedicated support for managing and debugging SQLite databases
JRebel for Android - Instantly update code and resources JRebel for Android is an IDE plug-in that accelerates the development of Android applications
NimbleDroid - Auto-test Your Android Apps for Critical Issues. No Coding Required
Markdown Navigator 2.0 - Markdown language support for IntelliJ IDEA.
The Noun Project - Icons for Everything
Trialy.IO - Increase your IAP conversions by letting your users try premium features for a limited time
Vysor - Vysor puts your Android on your desktop
Zeplin - Design hand-off has never been easier. Generate styleguides and resources, automatically

Kotlin for Android

Kotlin, the new statically-typed programming language from JetBrains aims to make Android app development fun and enjoyable once again. It's like Java on steroids. Here is a list of some cool Kotlin resources for you to get started.

Anko - Pleasant Android application development
Anvil - Minimal UI library for Android inspired by React
AsyncAwait - async/await for Android built upon coroutines introduced in Kotlin 1.1
Exposed - Kotlin SQL Framework
Klutter - A mix of random small libraries for Kotlin, the smallest reside here until big enough for their own repository
Kodein - Painless Kotlin Dependency Injection
KoHttp - Kotlin DSL http client
Koi - Koi, a lightweight Kotlin library for Android Development
KotlinPoet - A Kotlin API for generating .kt source files.
PreferenceHolder - SharedPreference usage made easy using Kotlin
RxKotlin - RxJava bindings for Kotlin
Spek - A specification framework for Kotlin

Android Studio Shortcuts

IDE shortcuts can really make your development workflow fast and smooth and Android Studio shines perfectly in this aspect. Ideally, you should make it a habit to not pick up the mouse to perform most of your actions and slowly migrate towards a mouseless-workflow. Here are some of the most useful shortcuts for you to get started.

(Currently, only Mac shortcuts are available. Windows and Linux shortcuts coming soon.)

Must-Know Shortcuts:

Never-ever-ever forget these shortcuts.

Description	Shortcut
Find everything (like files, classes, symbols, etc.)	`Shift` + `Shift`
Show a list of automatic fixes and IDE suggestions at the cursor	`Option` + `Enter`
Rename all copies of the variable/method/class at the cursor	`Shift` + `F6`
List all usages of the variable/method/class at the cursor	`Command` + `Option` + `F7`
Generate code (like getters, setters, constructors, method overrides)	`Command` + `N`
Search for any action in Android Studio	`Command` + `Shift` + `A`
Find text occurencesin the current file (Enter = cycle through results, Esc. = cancel)	`Command` + `F`
Show the list of recently used files in the IDE	`Command` + `E`
Run the app or test	`Control` + `R`

Frequently Used Shortcuts:

You will surely need these quite often.

Description	Shortcut
Search for and open any file by name	`Command` + `Shift` + `O`
Move a piece of code in upward/downward direction	`Command` + `Shift` + `Up/Down`
View javadoc of symbol at cursor in pop-up	`F1`
View definition of method at cursor in pop-up	`Command` + `Y`
Search for and list any occurrences of text	`Command` + `Shift` + `F`
Comment/Uncomment all selected lines (also works in xml files)	`Command` + `/`
Show available parameters for current method (must be inside parentheses)	`Command` + `P`
Format code to match Android Studio's default style	`Command` + `Option` + `L`
Delete a complete line at one go	`Command` + `Delete`
Navigate through classes and methods	`Command` + `Left Click`

Useful Shortcuts:

These can help you level up your development workflow.

Description	Shortcut
Go to next highlighted error in current file	`F2`
Go to the declaration of the variable/method/class at cursor	`Command` + `B`
Go to given line number in current file	`Command` + `L`
Duplicate current line	`Command` + `D`
Search for and go to any symbol (incl. variables and methods)	`Command` + `Option` + `O`
Show class structure in pop-up	`Command` + `F12`
List recently edited files in pop-up	`Command` + `Shift` + `E`
View full refactor menu	`Control` + `T`
Collapse/expand all code blocks	`Command` + `Shift` + `+/-`
Collapse/expand individual code block	`Command` + `+/-`
Insert new line below current cursor position	`Shift` + `Enter`
Complete statement (add braces, parentheses, semi-colon)	`Command` + `Shift` + `Enter`

Android Studio Live Templates

Just like shortcuts, Live Templates can make your life a lot easier by generating tons of boring boilerplate code in a jiffy. Android Studio comes pre-loaded with a lot of these templates and here is a collection of some of the best ones for you to get started.

Toast - Creates a new Toast.makeText(context, "", Toast.LENGTH_SHORT).show(); toast
newInstance - Generates the static newInstance factory method in a Fragment with arguments
noInstance - Generates a private empty constructor to prevent instance creation
ViewConstructors - Generates the view constructors
Parcelable - Generates the boilerplate code for Pacelable implementation
fbc - Generates the findViewById code with the appropriate cast
const - Generates a constant according to Android's coding conventions
logd - Generates Log.d(TAG, ""); log. Check the other variants as well
logm - Generates a log with the current method name and its arguments
logr - Generates a log result of the current method
psf - Generates the boilerplate public static final. Also check psfi and psfs
key - Generates the key constant for a Bundle
sout - Prints a string to System.out. Also check soutm and soutp
visible - Sets a view's visibility to VISIBLE
gone - Sets view's visibility to GONE
todo - Adds a TODO comment. Also check stopship

Can't get enough of Live Templates? Here is a huge repository of lots of custom Live Templates for you to get your hands on.

Sites

If you want to keep yourself updated with all the latest Android development news, articles and tutorials then these are some of the best sites in the Internet where the good Androidy-things happen all the time.

AndroidPub - The Pub(lication) for Android & Tech, focused on Development
Android Arsenal - Android developer portal with tools, libraries, and apps
Android Design Patterns - Android Design Patterns is a website for developers who wish to better understand the Android application framework
AndroidDevDigest - A Handcrafted Weekly #AndroidDev Newsletter
Android Developers Official - The official Android development page provided by Google containing all the documentations and trainings
Android Hive - Androidhive is independent online publication that covers Android programming tutorials, app reviews and more
Android Niceties - A collection of screenshots encompassing some of the most beautiful looking Android apps
Android Weekly - Android Weekly is a free newsletter that helps you to stay cutting-edge with your Android Development
Antonio Leiva's Blog - Amazing blog on Android development, with special focus on Kotlin from Antonio Leiva
Caster.IO - Skyrocket your Android career with bite sized Android development video training
Codepath Android Cliffnotes - One of the best and most up-to-date crowdsourced resource for Android developers where you will find guides and tutorials about almost everything in Android
Dan Lew Codes - Thoughts on life, the universe and the mystery of it all; but actually mostly just code
Grokking Android - Getting Down to the Nitty Gritty of Android Development
Material Up - Get fresh Material Design inspiration daily
Medium's Google Developers Blog - Engineering and technology articles for developers, written and curated by Googlers. The views expressed are those of the authors and don’t necessarily reflect those of Google
Mindork's Blog - A regularly updated blog talking about various aspects of Android development in detail
Philosophical Hacker - Some really informative articles on Android development
ProAndroidDev - Professional Android Development: the latest posts from Android Professionals and Google Developer Experts.
Reddit's AndroidDev - News for Android developers with the who, what, where when and how of the Android community. Probably mostly the how
Styling Android - Learn perfecting your Android UI and UX development skills
Talking Kotlin - A Podcast on Kotlin and more
Vogella - Learn almost everything about Android development in an easy way

Books

"Books are gifts that you can open again and again" - here is a curated list of some of the best books that can help you sharpen your Android, Java and overall programming skills. Pick one of them and just start reading.

Android Development with Kotlin- by Marcin Moskala, Igor Wojda
Android Programming: The Big Nerd Ranch Guide - by Bill Phillips, Chris Stewart, and Kristin Marsicano
Asynchronous Android - by Steve Liles
Clean Code - by Robert C. Martin
Effective Java - by Joshua Bloch
Head First Design Patterns - by Eric Freeman, Bert Bates, Kathy Sierra, Elisabeth Robson
Java: The Complete Reference - by Herbert Schildt
The Busy Coder's Guide to Advanced Android Development - by Mark Murphy
Working Effectively with Legacy Code - by Michael Feathers

Podcasts

Not too fond of reading books or blogs? You should definately try listening to some of these podcasts in your free time, while driving, cooking or doing the dishes.

Android Developers Backstage - Podcast made by Google, featuring Chet Haase and Tor Norbye
Android Snacks - The tl;dr of last weeks Android developer news
Fragmented Podcast - An Android Developer Podcast
The Context Podcast - Podcast about Android Development with Hannes Dorfmann, Artem Zinnatullin and wonderful guests

Sample Projects

If you want to get started with something quick-and-dirty, then sample projects are something which can help you a lot in understanding the concepts and technicalities in almost no time.

AdaptiveIconPlayground - An Android app for experimenting with Adaptive Icons
Android Architecture - A collection of samples to discuss and showcase different architectural tools and patterns for Android apps
Android Boilerplate - Android boilerplate app that showcases architecture and libraries used at ribot
Android Clean Architecture Boilerplate - An android boilerplate project using clean architecture from Buffer
Android Clean Architecture Kotlin - This is a movies sample app in Kotlin, which is part of a series of blog posts I have written about architecting android application using different approaches
Android Cookbook Examples - Collected code examples from the O'Reilly Android Cookbook
Android Instant Apps - Samples for Android Instant Apps
Android MVP Architecture - This repository contains a detailed sample app that implements MVP architecture using Dagger2, GreenDao, RxJava2, FastAndroidNetworking and PlaceholderView
Android MVVM Architecture - This repository contains a detailed sample app that implements MVVM architecture using Dagger2, Room, RxJava2, FastAndroidNetworking and PlaceholderView
Android Sunflower - A gardening app illustrating Android development best practices with Android Jetpack
Android Testing - A collection of samples demonstrating different frameworks and techniques for automated testing
Android Testing Guide - Complete reference for Android Testing with examples
Android Things Driver Samples - Samples for Android Things peripheral drivers
Android UniversalMusicPlayer - This sample shows how to implement an audio media app that works across multiple form factors and provide a consistent user experience on Android phones, tablets, Auto, Wear and Cast devices
Bubble - ample app showcases the MVP pattern and Robert Martin's Clean Architecture approach
Clean Architecture Manifest - Description of the main principles and rules for building an Android application using Clean Architecture approach
CW Omnibus - Source code to omnibus edition of The Busy Coder's Guide to Android Development
Effective Android UI - Sample project created to show some of the best Android practices to work in the Android UI Layer
Espresso Samples - A collection of samples demonstrating different Espresso techniques
Firebase Quickstart Android - Firebase Quickstart Samples for Android
Firebucket - Glimpse into Firebase, with a simple TODO list app built around Dagger, RxJava 2, Clean architecture and of course, Firebase
Java Design Patterns - Design patterns implemented in Java
Just Another Android App - An Android base app with loads of cool libraries/configuration
Material Animations - Android Transition animations explanation with examples
N26AndroidSamples - A public repo to demo the Reactive Clean Architecture
Quality Matters - Android Development Culture
RxJava Android Samples - Learning RxJava for Android by example
RxJava 2 Android Samples - RxJava 2 Android Examples - Migration From RxJava 1 to RxJava 2 - How to use RxJava 2 in Android
u2020 - A sample Android app which showcases advanced usage of Dagger among other open source libraries
VB Android App Quality - Sample android project using Gradle, with basic quality tools set up

Video Tutorials

Love learning from videos? Don't worry, we have got you covered. This list contains some of the most useful and informative video tutorials to boost up your Android development skills to the next level.

Advanced Android App Development (Udacity) - This course will guide you through the process of productionizing an app, using Sunshine, the weather app we built in Developing Android Apps
Android Developers (YouTube) - Google's official Android development channel on Youtube for all the tutorials, demos, events, etc
Beginner Java Tutorials (YouTube) - An excellent Java video tutorial series for beginners by thenewboston on YouTube.
Design Patterns Tutorials (YouTube) - Learn about all the Java design patterns in details from these quick and easy video tutorials by Derek Banas
Developing Android Apps (Udacity) - As the first course in the Android Developer Nanodegree, Developing Android Apps is the foundation of our advanced Android curriculum. This course blends theory and practice to help you build great apps the right way
Firebase in a Weekend: Android (YouTube) - In this course, you’ll learn how to use Firebase. Firebase is app development platform that provides developers a variety of tools and a scalable infrastructure to build high quality apps
Firebase for Android (YouTube) - Learn everything about Firebase and boost your Android development skills
Slidenerd Tutorials (YouTube) - One of the best channels covering a lot of tutorials on various aspects of Android

Twitter Profiles

If you are somebody who loves to engage with other fellow developers and surround yourself with all the latest news, ideas and happenings, then this list is just for you. Start following some of the best and most active Android and Java developers on Twitter.

Android Developers - News and announcements for developers from the Android team
Annyce Davis - #AndroidDev, Conference #Speaker, and #Instructor
Chet Haase - Willful misinterpretation. Android. Comedy. That kind of stuff
Chris Banes - #Android Developer Relations @Google
Chiu-Ki Chan - @monkeywrite & @heartcollage creator, Android developer, public speaker (@techspeakdigest), sketchnoter, language lover, world traveller
Cyril Mottier - Mobile Product Devsigner & Android expert. ex-Head of Mobile & Web @captaintrain. #UI #UX #Design
Dan Lew - Android @Trello/@Atlassian, gamer and geek. The views expressed in these tweets are yours and your employer's
Donn Felker - Best Selling Mobile Dev Book Author. Android GDE. Android Consultant. Co-Host of the @fragmentedcast. Teaching Android at @caster_io. Remote workforce advocate
Dave Smith - I write, speak, and build...mostly with Android+Embedded. IoT @ Google. Recovering spark-chaser
GenyMotion - The most complete Android emulation platform (desktop, cloud, on-demand) 🚀 • Trusted by 5M+ developers, testers & enthusiasts 🙌 • Made by @Genymobile in France
Huyen Tue Dao - Native Android Code Monkey: monkey code, monkey break, monkey debug, monkey iterate. Randomly typing on @Trello for @Atlassian. GDE. ½ of Android Dialogs
Jake Wharton - Stop stopping
Jesse Wilson - Android and jokes. Sometimes also inclusivity & sustainability
Joe Birch - Android Engineer @Buffer. Instructor @caster_io & @Pluralsight. Public Speaker, Android Tinkerer
Kaushik Gopal - I'm ½ of the @FragmentedCast and a Google Developer Expert. I build Android apps for @Instacart. I watch atleast 1 movie every week and Jon Stewart is my hero
Kristin Marsicano - Android Developer and Instructor @bignerdranch. Co-author of Android Programming: The Big Nerd Ranch Guide. Always learning
Lars Vogel - Eclipse platform UI and e4 project lead. Android and Eclipse RCP developer. CEO of vogella GmbH, book author, speaker, trainer and proud Dad and husband
Mark Allison - GDE for Android. I write code and https://blog.stylingandroid.com . Then I relax by supporting Watford FC. After that I need to drink good whisky
Nick Butcher - Design + Developer Advocate @Google, I help people to design and build lovely Android apps
Pierre-Yves Ricau - Android baker @Square
Rebecca Franks - Android Engineering Lead at @DVT_Corporate | Google Developer Expert for #Android and #IoT #GDE | Made @bookdash app | I ❤ baking and travelling
Reto Meier - Developer Advocate at Google, Android developer, and author of Professional Android Application Development series. Views expressed are mine alone
Romain Guy - Android Graphics team manager @Google, Photography
Roman Nurik - Designer on @Firebase at @Google · Android/Web Developer
Ryan Harter - Freelance Android Developer, Google Developer Expert, community leader
Tor Norbye - Tor Norbye is the tech lead for Android Studio at Google
Ty Smith - Android at @Uber Dev Platform - Google Developer Expert - @specializedtype investor - @sfaug and @droidconsf organizer - ex @twitter @fabric @evernote @zagat
Zarah Dominguez - Having a love/hate affair with the little green 'droid at @domaincomau; Google Developer Expert for Android; a walking contradiction

Game Development

If you aspire to develop amazing games for the Android platform, we haven't forgotten about you. Here are some of the best resources which can help you in kickstarting your Android game development career.

Frameworks

AndEngine - Free Android 2D OpenGL Game Engine
LibGDX - Desktop/Android/BlackBerry/iOS/HTML5 Java game development framework
Rajawali - Android OpenGL ES 2.0/3.0 Engine
Unity - Start creating a world class games using this framework

Open-Source Games

2048 - A Android Port of the 2048
ColorPhun - A Simple Color Game in Android
Game of Life - An Android implementation of Conway's Game of Life, focusing on clean design and implementation
Memory Game - Simple and beautiful memory game for kids
Pixel Dungeon - Traditional rogue-like game with pixel-art graphics and simple interface

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Project Maintained By

Aritra Roy

Android & Backend Developer. Blogger. Designer. Fitness Enthusiast.

License

Copyright 2017 aritraroy

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

aritraroy/UltimateAndroidReference

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