1. chapter 6- Android Introduction
中国科学技术大学软件学院

2. Agenda
Android architecture
Android-HAL
Android device driver 2

3. Android developments 3

4. Android developments Android 4.0 Ice Cream Sandwich
Android 4.2 Jelly Bean
Android 4.1 Jelly Bean
Android 4.0 Ice Cream Sandwich
Android 3.0Honeycomb
Android 2.3Gingerbread
Android 2.2/2.2.1Froyo
Android2.0/2.0.1/2.1Eclair
Android 1.6Donut
Android 1.5 Cupcake
Android1.1 Robot 4

5. Android developments Android Inc. founded 2003
 Purchased by Google from initial dveloper in 2005
Version 2.0 released 2009
Starts to take hold in the Smartphone Market
Version 3.0 released 2011
Predominantly used in Tablets 5

6. Android developments 6 Android 3.0 Honeycomb(蜂巢)2011.2.2
Android 4.0 Ice Cream Sandwich(冰激凌三明治) 
Android 4.1 Jelly Bean(果冻豆)
Android 4.2 Jelly Bean(果冻豆)
Android 4.3 Jelly Bean(果冻豆)
Android 4.4 KitKat(奇巧巧克力)
Android 5.0 Lollipop (棒棒糖) 6

7. Android developments 7

8. Android developments 8

9. Open source？ 9

10. Android Architecture
Android OS = Android Runtime + Linux Kernel 10

11. Android Architecture Kernel Layer
Android is built on the Linux kernel and Provide core system services such as process, memory, power management, network stack, driver model and security.
Android Driver Ashmem, Binder, Power Management, LowMemKillrer, logger. 11

12. Android Architecture 12

13. Android Architecture
Hardware Abstraction Layer – Abstract the hardware features , and separate the kernel space and user space. – It is user space, not kernel space. – GPL problem. 13

14. Android Architecture 14

15. Android Architecture
The library runs in the system. – Bionic Libc – Function Libraries – Hardware Abstraction Libraries 15

16. Android Architecture Bionic Libc WebKit- Apple Safari Media Framework
C/C++ library, custom libc implementation, optimized for embedded use.
WebKit- Apple Safari
Based on open source WebKit browser
Full CSS, Javascript, DOM, AJAX support
Media Framework
Based on PacketVideo OpenCORE platform
Supports standard video, audio, still-frame formats
Might be replaced by Stagefright framework
Surface manager
Audio manager
OpenGL 16

17. Android Architecture
Android Runtime. – Not use java runtime, and java virtual machine – Core library already contained more originally java API – Unlike most of virtual machines that are stack based, Dalvik architecture is register based. 17

18. Android Architecture
Native
Service
JNI
Android
Service
HAL 18

19. Android Architecture 19

20. Android Architecture
Application – Java programming – Default Application : , Browser, Clock, Calendar, etc. 20

21. thank you !