A Google Data API is an API based upon the Google Data protocol. The Google Data protocol is based on the Atom 1.0 and RSS 2.0 syndication formats, plus the Atom Publishing Protocol (APP). The Google Data protocol extends those standards in various ways, using the extension mechanisms built into the standards.

Ad Manager uses the Google Mobile Ads SDK which helps app developers gain insights about their users and maximize ad revenue. To do so, the default integration of the Mobile Ads SDK collects information such as device information. iOS setup Android setup.

Google Play services powers a broad set of SDKs on Android to help you build your app, enhance privacy and security, engage users, and grow your business. These SDKs are unique in that they only require a thin client library to be included in your app, as shown in figure 1. At runtime, the client library communicates with the bulk of the SDK's implementation and footprint in Google Play services.

Jsoup is an open source Java library used mainly for extracting data from HTML. It also allows you to manipulate and output HTML. It has a steady development line, great documentation, and a fluent and flexible API. Jsoup can also be used to parse and build XML.

What is Signpost? Signpost is the easy and intuitive solution for signing HTTP messages on the Java platform in conformance with the OAuth Core 1.0a standard. Signpost follows a modular and flexible design, allowing you to combine it with different HTTP messaging layers. Click here for a list of supported HTTP libraries. Signpost is a community effort and may be downloaded, modified, and redistributed under the terms of the Apache License version 2.

The PayPal Android SDK provides a native Android library that provides simple payment processing for common business needs. It simplifies accepting credit card and PayPal payments in your mobile app. The library presents a simple UI, features card.io credit card scanning, and uses a proof of payment system so you don’t need to worry about PCI compliance.

RestFB is a simple and flexible Facebook Graph API and Old REST API client written in Java. It is open source software released under the terms of the MIT License.

Twitter4J is an unofficial Java library for the Twitter API. With Twitter4J, you can easily integrate your Java application with the Twitter service.