In this chapter, we are going to look into the the Flutter system architecture. The Flutter system mainly comprises of following key components.

• Flutter Framework
• Flutter Engine
• Embedder Plateform Specific

Here, we will discuss flutter system architecture in bottom-up approach –

Embedder Platform Specific

Flutter applications are packaged in the same way as any other native application for the target platforms. Flutter provides a number of platform specific embedder for target platforms that coordinates a flutter application with the underlying operating system for accessing of services like rendering surfaces, accessibility, input and managing the message event loop.The embedder typically written in a best appropriate language for target platform.The embedder for android is written in C++ and Java, Objective C/Objective C++ for iOS and macOS, and C++ for Windows and Linux. With the use of embedder, Flutter code can also be integrated into an existing application as a module.

Flutter Engine

Primarily written in C++ flutter engine provides highly portable runtime environment for all flutter applications. It is mainly responsible for rendering of a composited screen whenever a new frame needs to be painted. It mainly provides the low-level implementation of Flutter’s core libraries for animation, graphics, file input/output, network input/output, plugin architecture, accessibility support, and a dart runtime for developing, compiling, and running Flutter applications.

Flutter Framework

Typically, developers uses the Flutter framework for developing flutter applications. Written in Dart it is a modern, reactive framework comes with a rich set of platform, layout, and libraries.