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Mobile Application Development with ANDROID

Mobile Application Development with ANDROID. Tejas Lagvankar UMBC 29 April 2009. Agenda. Mobile Application Development (MAD) Intro to Android platform Platform architecture Application building blocks Development tools Hello Android SAM Resources. Few reasons to go MAD….

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Mobile Application Development with ANDROID

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  1. Mobile Application Development with ANDROID Tejas Lagvankar UMBC 29 April 2009

  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

  5. Linux Kernel • Works as a HAL • Device drivers • Memory management • Process management • Networking

  6. Libraries • C/C++ libraries • Interface through Java • Surface manager – Handling UI Windows • 2D and 3D graphics • Media codecs, SQLite, Browser engine

  7. 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…

  8. Application Framework • API interface • Activity manager – manages application life cycle.

  9. Applications • Built in and user apps • Can replace built in apps

  10. Agenda • Mobile Application Development (MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Hello Android • SAM • Resources

  11. Application Building Blocks • Activity • IntentReceiver • Service • ContentProvider

  12. Activities • Typically correspond to one UI screen • But, they can: • Be faceless • Be in a floating window • Return a value

  13. IntentReceivers • Components that respond to broadcast ‘Intents’ • Way to respond to external notification or alarms • Apps can invent and broadcast their own Intent

  14. 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

  15. Intents Home Picasa Photo Gallery Contacts “Pick photo” GMail Client component makes a request for a specific action System picks best component for that action Chat New components can use existing functionality Blogger Blogger

  16. Services • Faceless components that run in the background • E.g. music player, network download etc…

  17. 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

  18. Agenda • Mobile Application Development (MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Hello Android • SAM • Resources

  19. Development Tools • Eclipse • Android SDK developer.android.com

  20. The Emulator • QEMU-based ARM emulator • Runs the same image as the device • Limitations: • No Camera support

  21. Devices

  22. Hello World • Generating UIs • Views – building blocks • E.g. TextView, EditText, Button • Placed into Layouts • E.g. LinearLayout, TableLayout, AbsoluteLayout

  23. SAM Demo

  24. Interesting things to do • Android is open source • Opportunities for researchers • Get the source, compile and update the device image

  25. References • http://developer.android.com • http://sites.google.com/site/io

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