Android - Architecture
Android operating system is a stack of software components which is roughly divided into five sections
and four main layers as shown below in the architecture diagram.
Linux kernel
At the bottom of the layers is Linux - Linux 3.6 with approximately 115 patches. This provides a level of
abstraction between the device hardware and it contains all the essential hardware drivers like camera,
keypad, display etc. Also, the kernel handles all the things that Linux is really good at such as networking
and a vast array of device drivers, which take the pain out of interfacing to peripheral hardware.
Libraries
On top of Linux kernel there is a set of libraries including open-source Web browser engine WebKit, well
known library libc, SQLite database which is a useful repository for storage and sharing of application
data, libraries to play and record audio and video, SSL libraries responsible for Internet security etc.
Android Libraries
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