265.ppt
- 2. Agenda • Mobile Application Development (MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Hello Android • SAM • Resources
- 3. Few reasons to go MAD… • Smart Phones – Internet access anywhere – Social networking • Millions of mobile users • Open standards
- 4. Introduction to Android • Open software platform for mobile development • A complete stack – OS, Middleware, Applications • An Open Handset Alliance (OHA) project • Powered by Linux operating system • Fast application development in Java • Open source under the Apache 2 license
- 6. Linux Kernel • Works as a HAL • Device drivers • Memory management • Process management • Networking
- 7. Libraries • C/C++ libraries • Interface through Java • Surface manager – Handling UI Windows • 2D and 3D graphics • Media codecs, SQLite, Browser engine
- 8. Android Runtime • Dalvik VM – Dex files – Compact and efficient than class files – Limited memory and battery power • Core Libraries – Java 5 Std edition – Collections, I/O etc…
- 9. Application Framework • API interface • Activity manager – manages application life cycle.
- 10. Applications • Built in and user apps • Can replace built in apps
- 11. Agenda • Mobile Application Development (MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Hello Android • SAM • Resources
- 12. Application Building Blocks • Activity • IntentReceiver • Service • ContentProvider
- 13. Activities • Typically correspond to one UI screen • But, they can: – Be faceless – Be in a floating window – Return a value
- 14. IntentReceivers • Components that respond to broadcast ‘Intents’ • Way to respond to external notification or alarms • Apps can invent and broadcast their own Intent
- 15. Intents • Think of Intents as a verb and object; a description of what you want done – E.g. VIEW, CALL, PLAY etc.. • System matches Intent with Activity that can best provide the service • Activities and IntentReceivers describe what Intents they can service
- 16. Intents GMail Contacts Home Blogger Chat Client component makes a request for a specific action “Pick photo” Picasa System picks best component for that action New components can use existing functionality Blogger Photo Gallery
- 17. Services • Faceless components that run in the background – E.g. music player, network download etc…
- 18. ContentProviders • Enables sharing of data across applications – E.g. address book, photo gallery • Provides uniform APIs for: – querying – delete, update and insert. • Content is represented by URI and MIME type
- 19. Agenda • Mobile Application Development (MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Hello Android • SAM • Resources
- 20. Development Tools • Eclipse • Android SDK developer.android.com
- 21. The Emulator • QEMU-based ARM emulator • Runs the same image as the device • Limitations: – No Camera support
- 22. Devices
- 23. Hello World • Generating UIs – Views – building blocks – E.g. TextView, EditText, Button – Placed into Layouts – E.g. LinearLayout, TableLayout, AbsoluteLayout
- 24. SAM Demo
- 25. Interesting things to do • Android is open source • Opportunities for researchers • Get the source, compile and update the device image