Android笔记-What is Android

What is Android

1. Linux kernel based

2. Java as programminglanguage

3. OS kernel + middle ware +application

 

Features

1. 3D graphics based on theOpenGL ES 1.0  (OpenGL ES 2.0 alreadyreleased)

2. Webkit as browser

3. Dalvik virtual machinemaybe it's a Java virtual machine

4. Sqlite

 

Architecture

•  Application – somecore applications bounded with the OS

 Contact - Notepad

 Browser – justlike IE in Windows

Maps

Email client – Outlook

SMG program 

• Application framework – provide some APIs to application

n        Views – WindowsAPI

n        Content Provider - file operating API

n        Resource Management – String,GDI,

n        Notification Management

n        Activity Management – Processand thread API

• Libraries – someC/C++ libraries used by application framework, most of which are third partylibraries.

n        System C library

n        Surface library

n        3D OpenGL ES 1.0

n        Media Library

n        Sqlite

•  Android Runtime

n        Core library – provide functionalityof libraries with Java programming language

n        Dalvik virtual machine – run.dex format file which is optimised as minimum memory footprint.

• Linux kernal

Version 2.6

 

wifi wireless fidelity 无线保真 传输距离长，传输速度快，但传输可靠性较差。