Android Architecture

                                    

 APPLICATION LAYER

Android Application Framework

Activity Manager :Manages the life cycle of applications

Content provider :Enable applications  access data from other applications

Resource Manager :Providing access to non-code resources

Window Manager   :window manager instance is bound to a particular Display.The simplest way to show a window on another display is to create a Presentation. The presentation will automatically obtain a WindowManager and Context for that display. 

Notification manager:Class to notify the user of events that happen. This is how you tell the user that something has happened in the background

                                           Libraries

Android Supportive Library

Written in C/C++ - System C Library(libc)

Surface manager - composing different drawing screens

Display/Graphics(SGL)-for 2D graphics

OpenGLES – 3D Graphics Library

Media Libraries

SQLite –RDB engine-light weight

LibWebCore–web browser engine–embeddable web view

Includes a set of core libraries that provides most of the functionality-JAVA

Every Android application runs in its own process

Dalvik VM executes files in the (.dex) format

Device can run multiple VMs efficiently

                                

 Linux Kernel

Linux Version 2.6 as - h/w abstraction layer

Proven driver model

Security, Memory & Process Management

Efficient computing resource management

Stable and proven for mobile platform