Build Realtime Apps. A powerful API to store and sync data in realtime.

A service for developers that allows users to share the app with people that they know.

Google Cloud Messaging for Android (GCM) is a service that allows you to send data from your server to your users' Android-powered device, and also to receive messages from devices on the same connection. The GCM service handles all aspects of queueing of messages and delivery to the target Android application running on the target device. GCM is completely free no matter how big your messaging needs are, and there are no quotas.

The Google Mobile Ads SDK is the latest generation in Google mobile advertising featuring refined ad formats and streamlined APIs for access to mobile ad networks and advertising solutions. The SDK enables mobile app developers to maximize their monetization on Android, iOS, and Windows Phone 8.

The collection of search and search related APIs in Google's Android GMS framework.

Google Sign-In is a secure authentication system that reduces the burden of login for your users, by enabling them to sign in with their Google Account—the same account they already use with Gmail, Play, Google+, and other Google services. Google Sign-In is also your gateway to connecting with Google’s users and services in a secure manner. You can give your users the opportunity to pay with Google Pay, share with their Google-wide contacts, save a file to Drive, add an event to Calendar, and more. Integrate Google’s user-centric APIs and services inside your app to help your users take action and convert.

Google Tag Manager enables developers to change configuration values in their mobile applications using the Google Tag Manager interface without having to rebuild and resubmit application binaries to app marketplaces. This is useful for managing any configuration values or flags in your application that you may need to change in the future, including: * Various UI settings and display strings * Sizes, locations, or types of ads served in your application * Game settings Configuration values may also be evaluated at runtime using rules, enabling dynamic configurations such as: * Using screen size to determine ad banner size * Using language and location to configure UI flags Google TagManager also enables the dynamic implementation of tracking tags and pixels in applications. Developers can push important events into a data layer and decide later which tracking tags or pixels should be fired. TagManager currently supports the following tags: * Google Mobile App Analytics * Custom Function Call tag

A software library that provides scanning features such as barcodes or face analysis to recognize faces in pictures and details about the face as well.

ZXing (pronounced "zebra crossing") is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages. Our focus is on using the built-in camera on mobile phones to scan and decode barcodes on the device, without communicating with a server.

All APIs for communicating with the Android system.

Google Play services offers a standard authorization flow for all Google APIs and all components of Google Play services. In addition, you can leverage the authorization portion of the Google Play services SDK to gain authorization to services that are not yet supported in the Google Play services platform by using the access token to manually make API requests or using a client library provided by the service provider.