Android OS

Android OS is based on

• Linux

• iOS

• Darwing

• APKs

It is composed of a set of architectural layers following a software stack model. These layers are:

• 1. Android OS, Applications, Hardware, Kernel

• 1. 1-Applications, 2-Application Framework, 3.1-Libraries (C/C++) / 3.2Android Runtime, 4-Hardware Abstraction Layer, 5-Linux Kernel

• 1. 1-Applications, 2-Application Framework, 3-Linux Kernel

• Core OS, Core Services, Media, Cocoa Touch

The components in this layer are the mobile “apps” (mostly developed by Google) that are shipped with the Android OS and we use daily such as Browser, Calendar, Telephony, Messaging, and Settings.
Select the Layer

• Hardware Abstraction Layer

• Native Libraries (C/C++)

• Applications

• Application Framework

This layer provides apps (and developers) with the building blocks and common tasks required for exposing/using device- and Android-specific features such as managing UI elements and sensors.

• Hardware Abstraction Layer

• Runtime

• Android Framework

• Applications

This layer contains the Virtual Machine (Dalvik/ART) and the core libraries required for the execution of apps and services on the device

• Runtime

• Applications

• Native Libraries (C/C++)

• Android Framework

This layer provides low level functionalities and computational intensive services required by the Android Framework and the Runtime, such as the Bionic libc library, the WebKit browser engine, OpenGL, SSL, and the Media Framework.

• Native Libraries (C/C++)

• Android Framework

• Runtime

• Hardware Abstraction Layer

This layer is the bridge between the high level representations of the hardware used in the libraries, and low level representations used by the kernel. It is a set of interfaces for hardware-specific software that needs to be implemented by OEMs and hardware manufacturers.

• Runtime

• Android Framework

• Hardware Abstraction Layer

• Linux Kernel

This layer provides the Android OS with core OS systems infrastructure, a security model, networking, and memory and process management, among others

• Applications

• Android Framework

• Runtime

• Linux Kernel

Android uses a kernel of type...

• Macrokernel

• Microlithic kernel

• Microkernel

• Monolithic kernel