The Android platform provides a framework API that applications can use to interact with the underlying Android system. The framework API consists of: A core set of packages and classes. A set of permissions that applications can request, as well as permission enforcements included in the system

The Apache HttpComponents project is responsible for creating and maintaining a toolset of low level Java components focused on HTTP and associated protocols.

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.

kObjects is a collection of small ("kilobyte") projects. Most of the projects are suitable or designed for the Java 2 Micro Edition (J2ME/MIDP).

The ksoap2-android project provides a lightweight and efficient SOAP client library for the Android platform. It is a fork of the kSOAP2 library that is tested mostly on the Android platform, but should also work on other platforms using Java libraries. It is still using Java 1.3 so should work fine on JavaME, Blackberry and so on.

kXML is a small XML pull parser, specially designed for constrained environments such as Applets, Personal Java or MIDP devices.

Retrofit is type-safe REST client for Android and Java which aims to make it easier to consume RESTful web services. ... Retrofit automatically serialises the JSON response using a POJO(Plain Old Java Object) which must be defined in advanced for the JSON Structure.

An Android SDK that provides a new size unit - sdp (scalable dp). This size unit scales with the screen size. An android lib that provides a new size unit - sdp (scalable dp). This size unit scales with the screen size. It can help Android developers with supporting multiple screens.

HTTP is the way modern applications network. It’s how we exchange data & media. Doing HTTP efficiently makes your stuff load faster and saves bandwidth. OkHttp is an HTTP client that’s efficient by default: HTTP/2 support allows all requests to the same host to share a socket. Connection pooling reduces request latency (if HTTP/2 isn’t available). Transparent GZIP shrinks download sizes. Response caching avoids the network completely for repeat requests. OkHttp perseveres when the network is troublesome: it will silently recover from common connection problems. If your service has multiple IP addresses OkHttp will attempt alternate addresses if the first connect fails. This is necessary for IPv4+IPv6 and for services hosted in redundant data centers. OkHttp supports modern TLS features (TLS 1.3, ALPN, certificate pinning). It can be configured to fall back for broad connectivity. Using OkHttp is easy. Its request/response API is designed with fluent builders and immutability. It supports both synchronous blocking calls and async calls with callbacks.

XmlPull project is dedicated to be a site for * for general Pull parsing promotion/education (including StAX) and in particular to contain easy-to-reuse samples and code fragments * a resource for discussing new ideas and concepts related to pull parsing * a java namespace (org.xmlpull.*) and project location of a free implementation of the event object API and Factories, based on the StAX XMLStreamReade and old Common API for XML Pull Parsing * as java namespace and project location of StAX and XmlPull based utilities and samples such as: - providing an XML stream from a DOM tree - a DOM builder - SAX adapter - JUnit tests * as a maintenance resource for the existing XmlPull interface