Lecture slides introduction_introduction
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The document summarizes key components of the Android software stack including the OS kernel, system libraries, application frameworks, and main apps. It describes the Android SDK for developing apps, along with libraries and development tools. The document also outlines core components like the Dalvik virtual machine, system libraries, and app lifecycle management.
Lecture slides introduction_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
- 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
- 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