mobile developpment introduction

3. A software stack for mobile devices:
OS kernel, system libraries, application
frameworks & key apps
Android SDK for creating apps
Libraries & development tools
Lots of documentation. Start browsing
today!
See: http://developer.android.com/
training

5. Security
Memory & process management
File & network I/O
Device drivers

6. Power management
Android shared memory
Low memory killer
Interprocess communication
And much more

8. System C library
Bionic libc
Surface Mgr.
Display
management
Media
Framework
Audio/ Video
Webkit
browser engine
OpenGL
Graphics engines
SQLite
Relational
database engine

10. Two main components
Core Java libraries
Dalvik Virtual Machine

11. basic java classes -- java.*, javax.*
app lifecycle -- android.*
Internet/Web services -- org. *
Unit testing -- junit.*

12. Apps are executed by the dalvik
virtual machine

13. App written in java
compiled to Java bytecode files
dx converts java bytecode files to a
single dex bytecode file (classes.dex)
Dalvik executes dex bytecode file

14. Designed for resource-constrained
environments
Slower CPU
Less RAM
Limited battery life

15. See:
Dalvik VM Internals by Dan Bornstein
http://www.youtube.com/watch?
v=ptjedOZEXPM

17. Keeps track of app packages on
device

19. Manages the windows comprising
an App

20. Main
Window
Notification
Bar
Subwindow

21. Provides common user interface
elements
e.g., icons, text entry boxes, buttons and
more

22. Tabs

23. TextView
Buttons

24. Manages non-compiled resources
e.g., strings, graphics, & layout files

26. Manages app lifecycle and
navigation stack

28. Inter-application data sharing

30. Provides location & movement
information

32. Place notification icons in the status
bar when important events occur

34. Notification

36. Standard apps include:
Home – main screen
Contacts – contacts database
Phone – dial phone numbers
Browser – view web pages
Email reader –compose & read email
messages

37. Nothing special about these apps
You can substitute your own or 3rd
party app for any of them

38. Android Development Environment