Documentation | Android Developers
Whether you're building for Android handsets, Wear OS by Google, Android TV, Android Auto, or Android Things, this section provides the guides and API reference you need.
Samples
Java
Universal Android Music Player Sample
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.
Java
Android testing samples
A collection of samples demonstrating different frameworks and techniques for automated testing.
Libraries
Libraries
Android Architecture components
This library provides APIs for essential app architecture tasks like lifecycle management and data persistence, so you can write modular apps with less boilerplate code.
Libraries
Support library
The Android Support Library offers backward-compatible versions of a number of features, including others not built into the framework.
Libraries
Play Billing Library
The Google Play Billing Library provides a simple interface for sending billing requests and managing billing transactions with Google Play.
Developer Tools
Guide
Android Emulator
You can install and run your app on the Android Emulator faster than with a physical device. It simulates various device configurations and hardware sensors, and it uses a snapshot to quickly resume exactly where you left off.
Guide
Configure your build
Android Studio uses Gradle, an advanced build toolkit, to automate the build process, while allowing you to define flexible, custom build configurations.
Guide
Build your UI layout
Android Studio includes a layout editor that allows you to build and preview your app UI by dragging elements into a visual design editor instead of writing layout XML by hand.
Guide
Profile your app performance
Poor app performance can ruin the user experience and destroy your app's reputation. If it ever responds slowly, shows choppy animations, freezes, crashes, or consumes a lot of power, your users will notice. To avoid these performance problems, use the Android Profiler to measure your app's memory, CPU, and network usage.
More education
Check out these other resources for beginner and experienced Android developers.
Android codelabs
Codelabs are short, self-paced tutorials that step you through the process of building a particular type of app or adding a new feature to an existing app.
Online video courses
Google partnered with Udacity to teach Android development with online videos. Several free courses are available, or you can enroll in the Nanodegree program.
Training courses
These online trainings provide a guided path through the process of learning how to build Android apps. Courses are available for new and advanced developers.