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Start building your Android app with the Android Platform APIs. They are available inKotlin and Java.

Note: Many Kotlin reference topics are derived from Java-based source code. This means that some Kotlin reference topics might contain Java code snippets.

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These additional libraries make it easy to add additional functionality and features to your app.

Jetpack

AndroidX

Refactored versions of the Android APIs that are not bundled with the operating system.
ReferenceUser Guide

Jetpack Compose

Jetpack Compose is a modern toolkit for building native Android UI. Jetpack Compose simplifies and accelerates UI development on Android with less code, powerful tools, and intuitive Kotlin APIs.
ReferenceUser Guide

AndroidX Test

Includes APIs for testing your Android app, including Espresso, JUnit Runner, JUnit4 rules, and UI Automator.
ReferenceUser Guide

AndroidX Constraint Layout

Includes ConstraintLayout and related APIs for building constraint-based layouts.
ReferenceUser Guide

Databinding Library

Includes APIs to help you write declarative layouts and minimize the glue code necessary to bind your application logic and layouts.
ReferenceUser Guide

Device Libraries

Android Automotive Library

Provides APIs for building Android Automotive apps.
ReferenceUser Guide

Android for Cars App Library (Beta)

A library for building Android Auto apps. This library is currently in beta. You can design, develop, and test navigation, parking, and charging apps for Android Auto, but you can't distribute these apps through the Google Play Store yet. We will make announcements in the future when you can distribute these apps through the Google Play Store.
ReferenceUser Guide

Android Wearable Library

Provides APIs to build apps for wearable devices running Wear OS by Google.
ReferenceUser Guide

Other Libraries

Material Components

Material Components for Android (MDC-Android) help developers execute Material Design to build beautiful and functional Android apps.
ReferenceUser Guide

Android NDK

The Android NDK is a toolset that lets you implement parts of your app in native code, usinglanguages such as C and C++.
ReferenceUser Guide

Google Play

Play In-app Billing Library

Provides APIs to help you implement Google Play's in-app billing and subscription features.
ReferenceUser Guide

Play Core Library

Provides APIs to help you request, monitor, and manage on demand downloads for Play Feature Delivery, Play Asset Delivery, and offers additional APIs such as in-app updates and in-app reviews. This library is available in Java, Native code, and Unity.

Play Install Referrer library

Provides APIs to securely retrieve referral content from Google Play.
Reference

Deprecated Libraries

These libraries are superseded by the AndroidX librariesand are no longer maintened. They are still shipped in the SDK to support legacy apps. For moreinformation see the androidx migration guide.

Top Free Android Apps

Come On App Android App Store

Android Support Library

Provided a variety of Android feature and utility APIsthat are compatible with a wide range of platform versions.The original library is superseded by theAndroidX libraries.

Android Test Support Library

Includes APIs for testing your Android app, including Espresso, JUnit Runner, JUnit4 rules, and UI Automator. The original library is superseded by the AndroidX Test library.

Architecture Components

Includes APIs for a variety of core app components, such as APIs that manage your UI component lifecycle, data persistence, view model, and more. The original library is superseded by the AndroidX libraries.

Constraint Layout Library

Legacy Support Library ConstraintLayout and related APIs for building constraint-based layouts. The original library is superseded by the AndroidX constraintlayout library.

Android Things Library

Provided APIs to build connected devices running the Android Things platform. The original library is no longer maintained.