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

Mono for Android is a runtime and development stack that allows . NET developers to leverage their knowledge of Visual Studio and C# to develop applications for Android-based devices. It interprets the Mono byte code and handles communication with the Dalvik runtime for calls to native Android APIs

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

OpenTK, also known as The Open Toolkit library, is a C# graphics library superseding the Tao Framework. It provides access to graphics tools contained in OpenGL, OpenCL, and OpenAL to a variety of CLR-based languages Use OpenTK to add cross-platform 3d graphics, audio, compute and haptics to your C# application. Integrate it into your existing user interface or use it standalone without any external dependencies.

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.

Create native iOS, Android, Mac and Windows apps in C#. We created Xamarin because we knew there had to be a better way – a better way to design apps, to develop apps, to integrate apps, to test apps and more. We’re developers, so we know what developers want: a modern programming language, code sharing across all platforms, prebuilt backend connectors and no-compromise native user interfaces.