Android introduction

1. Something about Android
Leo.liang@gmail.com
2009-12

3. Overview
Cool Application
Internal
Application development
Others

4. What’s Android
 Android is a software stack for mobile devices that
includes an operating system, middleware and key
applications

5. History
 2003, Startup Android Inc.
 Aug 2005, Google Buys Android
 Nov 2007, Open Handset Alliance
 Nov 2007, First SDK
 Apr 2008, ADC
 Oct 2008, First device: T-Mobile G1
 Oct 2008, Open source

6. Roadmap
HTC HTC HTC HTC Motorola SonyEricsson
Dream (G1) Magic Hero Tattoo Droid Xepria X10
1.0 1.1 1.5 1.6 2.0 2.1
Cupcake Donut Eclair Flan

7. Typical Hardware Spec
 Touch screen (480x320, QVGA, WVGA)
 Video/still camera
 GPS
 Accelerometer
 Magnetometer
Enable the User Experience

8. Overview
Cool Application
Internal
Application development
Others

9. Cool Application
Location Based
 Map + GPS + POI
Place Directory Google Maps

10. Cool Application
Augmented Reality
Wikitude World Browser Google Sky Map

11. Cool Application
Augmented Reality

12. Cool Application
Audio & Image Search

13. Cool Application
Use Pictures to Search the Web

14. Overview
Cool Application
Internal
Application development
Others

15. DNA of Android
 Built on the Linux kernel
 Uses the Dalvik virtual machine
 Core and 3rd party applications have equal access

16. Process
 One Linux process per application
 Application runs in Dalvik VM
 Application head limit: 16MB
Dalvik VM Dalvik VM
 Auto GC
Application A Application B
 Multi-thread supported
Linux process Linux process

17. Process Lifecycle
 Android is a multitasking system
 But you can only start an application, can’t stop an
application
 System will automatically kill processes to conserve
memory on necessary
 Activity can save state on destroy and restore state
on restart to keep seamless user experience
Where is
the close
button?
Last activated applications
Some of them might have been killed

18. Memory
SD card
ext2 / ext3
Swap FAT / FAT32
(app2sd)
GPU Baseband
RAM
Linux memory
used used
Flash Memory
File System Apps OTA upgrade
Recovery
SPL
Image /dev /system /data /cache …
SPL: secondary program loader (boot loader)

19. Custom ROM
JesusFreke’s ROM
Haykuro Rogers ROM (神童)
Chinese: GeesunMod

20. Root
 Linux OS root user privilege
 Why to root?
 Full control over your system
 Ability to alter system files.
 Run special apps that need more control over the system
 App2sd
 ……
 How to root?

21. Overview
Cool Application
Internal
Application development
Others

22. Development Environment
 SDK = libraries + tools + emulator + doc
 SDK add-on: Google Maps API
 Development Environment
 Eclipse + ADT plugin
 Tools + Ant

23. Build Process & Artifacts

24. Android Application Fundamentals
 Fundamentals
 Activity intent intent
 Service
 Broadcast receiver
 Content provider
 Intent
Running in background
Music play service

25. Activities & Tasks
 Task: a stack of activities
 A task can contain
activities from different
applications
 Back button navigates Task Task
backward in the stack
 All the activities in a
task move together as a
unit

26. User Interface
 View & ViewGroup
 XML layout file
 Create object in code

27. API
 Android Specified
 System
 UI
 SQLite
 JDK
 HttpClient
 JSON
 XML
 Add-on
 Google Map API

28. Publish Your Application

29. After Published

Mobile Advertising

for Mobile Application
 Flurry.com
Mobile application analytics

30. Overview
Cool Application
Internal
Application development
Others

31. 山寨

32. Vendor Customization
Motorola Blur
HTC Sense
SonyEricsson Rachael
Other bundle Applications
applications (Gmail, Calendar, Market etc)
Replace UI
Applications
Google Account
Android
(Open Source)

33. OMS (OPhone)

34. OMS (OPhone)
Applications
JIL Widget (Gmail, Calendar, Market etc)
Replace UI
Applications
Google Account
Android Applications
(Open Source)

35. GFW
 Android mobile is Internet mobile
 Google services
 Application as front-end, web service back-end
 Cloud computing
 DNS pollution:
android.clients.google.com
 VPN support in Android