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Developing great Android apps is hard, as anyone who has ever tried to make one can attest. So it helps to turn up fully-equipped for battle. To that end, here's a curated list of indispensable resources.

I only put in the best of the best links here, things that I personally use all the time, so this is not your average "awesome" list. It's awesome-r. 😎

Design

• Material Design Guidelines - Official Android design guidelines by Google

Icon galleries:

• Material Design Icons - Includes official Google icons & community-created ones, all free
• The Noun Project - Well-designed, free-to-use pictograms/icons; good for launcher icons
• Flaticon - Database of free vector icons

Tools:

• Material Palette - Material Design color palette generator
• Unsplash - Beautiful free high-res photos
• Android Asset Studio - Utilities for generating various kinds of Android-specific assets
• Shape Shifter - Tool to create AnimatedVectorDrawables (e.g., icon morphing animations)
• Android Icon Animator - another icon animation tool
• Android Feature Graphic Generator - Generates feature graphic for your Play Store listing
• SVG to VectorDrawable Converter - if this doesn't work well, try this other one
• Keyline Pushing - Helps you align your app layout to Material Design keylines

Inspiration:

• MaterialUp - Community-powered Material Design inspiration
• Android Niceties - Not searchable, but high quality UIs only
• Mobile Patterns - Categorized, searchable

Reference:

• Android Cheatsheet for Graphic Designers
• Official metrics for popular Android devices - Screen metrics & recommended Material dimensions

Libraries

There are extensive lists elsewhere, so I'll just direct you there:

• Android Arsenal
• Android Custom Views
• Jürgen Stumpp's list

Tutorials and Blogs

Tutorials:

• Official Android Training Guides
• Official Android API Guides
• Official Android Codelabs - Really good step-by-step, hands-on coding tutorials by Google
• Vogella.com Tutorials

Talks:

• Realm's Android talks - Good talks with full transcripts! Not just Realm-specific
• Google I/O 2016
• Android Dev Summit 2015
• Google I/O 2015
• Google I/O 2014
• Google I/O 2013
• Android Developers YouTube Channel

Blogs:

• Android Developers Blog
• Android Design Patterns
• Cyril Mottier's Blog
• Grokking Android
• Mark Murphy aka CommonsWare's blog
• Romain Guy's Blog
• Chet Hasse's Blog
• Prismatic's Android Guide

Specific topics:

• Retrofit tutorial series - Future Studio - beginner to advanced level tutorials on all aspects of Retrofit
• An Introduction to Icon Animation Techniques - Android Design Patterns

Online Courses

• Udacity - Android development courses (most developed by Google)
• Udacity - Android Developer Nanodegree (Paid)
• Coursera Android development courses

Open-source apps

Published apps:

• SeriesGuide Show Manager
• Google I/O app
• Phonograph Music Player
• Plaid (Material Design)
• FastHub (GitHub client)
• Quill
• Telegram
• HN Android
• DashClock

Samples:

• ApiDemos - Official samples from Google
• u2020

Many more F/OSS apps in this Wikipedia article, grouped by app category.

Newsletters

Stay up-to-date with the latest techniques, news, and job openings.

• Android Weekly
• Android Dev Digest

Developer tools and debugging

• Stetho - Debug bridge for Android apps - debug network requests, view hierarchy, and more using Chrome DevTools!
• LeakCanary - Automatically detect Activity memory leaks in your app!
• Debug Drawer - Access debugging information right from your app
• Remote debugging WebViews via Chrome
• Scalpel - View your UI hierarchy in 3D! Useful for those pesky z-index issues

If you think I've missed some useful resource, please file an issue, or fork and send a pull request!

Curated by: @vickychijwani