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

Apache Cordova is a platform for building native mobile applications using HTML, CSS and JavaScript.

Barcode scanning library for Android, using ZXing for decoding. The project is loosely based on the ZXing Android Barcode Scanner application, but is not affiliated with the official ZXing project. Features: 1.Can be used via Intents (little code required). 2.Can be embedded in an Activity, for advanced customization of UI and logic. 3.Scanning can be performed in landscape or portrait mode. 4.Camera is managed in a background thread, for fast startup time.

HTTP requests work as the intermediary transportation method between a client/application and a server. The client submits an HTTP request to the server, and after internalizing the message, the server sends back a response. The response contains status information about the request. This library is available under the MIT License.

Ionic makes it incredibly easy to build beautiful and interactive mobile apps using HTML5 and AngularJS. An open source mobile UI toolkit for building high quality, cross-platform native and web app experiences. Move faster with a single code base, running everywhere with JavaScript and the Web.

Okio is a new library that complements java.io and java.nio to make it much easier to access, store, and process your data.A modern I/O library for Android, Kotlin, and Java

Easily create apps using the web technologies you know and love: HTML, CSS, and JavaScript. PhoneGap is a free and open source framework that allows you to create mobile apps using standardized web APIs for the platforms you care about. Build great apps powered by open web standards. Cut down on development time by re-using your existing web dev skills, frameworks and tools. Get all the benefits of cross-platform development while building apps just the way you like.

This plugin allows you to use the native sharing window of your mobile device. Cordova plugin to share text, a file (image/PDF/..), or a URL (or all three) via the native sharing widget

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.

ZXing ("zebra crossing") is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages.