Introduction to android
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This document discusses an ECS 152B project proposal involving peer-to-peer, Android, VoIP, and soft handoff using Java. It then provides an overview of Android fundamentals including the platform architecture, application building blocks, development tools, and a basic "Hello World" application example. Key concepts covered are activities, intents, services, content providers, the emulator, and the application lifecycle.
Introduction to android
- 1. ECS 152B • Yichuan Wang • [email protected] • Possible project: p2p+android+voip+soft handoff
- 2. Java • Basic Java programming – Exceptions – Inner Class, Interface • Advanced topics we will touch: – Java IO – Java Thread – Java Socket • pages.cs.wisc.edu/~hasti/cs368/JavaTutor ial/
- 3. Android Basics Credit goes to Google and UMBC
- 4. Agenda • Mobile Application Development (MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Hello Android
- 5. Few reasons to go MAD… • Smart Phones – Internet access anywhere – Social networking • Millions of mobile users • Open standards
- 6. 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
- 8. Linux Kernel • Works as a HAL • Device drivers • Memory management • Process management • Networking
- 9. Libraries • C/C++ libraries • Interface through Java • Surface manager – Handling UI Windows • 2D and 3D graphics • Media codecs, SQLite, Browser engine
- 10. 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…
- 11. Application Framework • API interface • Activity manager – manages application life cycle.
- 12. Applications • Built in and user apps • Can replace built in apps
- 13. Agenda • Mobile Application Development (MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Hello Android
- 14. Application Building Blocks • Activity • IntentReceiver • Service • ContentProvider
- 15. Activities • Typically correspond to one UI screen • But, they can: – Be faceless – Be in a floating window – Return a value
- 16. IntentReceivers • Components that respond to broadcast ‘Intents’ • Way to respond to external notification or alarms • Apps can invent and broadcast their own Intent
- 17. 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
- 18. Intents Home Picasa Photo Gallery Contacts “Pick photo” GMail Client component makes a System picks best Chat request for a specific use New components can component for that action action functionality existing Blogger Blogger
- 19. Services • Faceless components that run in the background – E.g. music player, network download etc…
- 20. 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
- 21. Agenda • Mobile Application Development (MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Hello Android
- 22. Development Tools • Eclipse • Android SDK 1.0-2.0 developer.android.com
- 23. The Emulator • QEMU-based ARM emulator • Runs the same image as the device • Limitations: – No Camera support
- 24. Devices
- 25. Hello World • http://developer.android.com/guide/tutorial s/hello-world.html • Generating UIs – Views – building blocks – E.g. TextView, EditText, Button – Placed into Layouts – E.g. LinearLayout, TableLayout, AbsoluteLayout
- 26. Application Lifecycle • Application run in their own processes (VM, PID) • Processes are started and stopped as needed to run an application's components • Processes may be killed to reclaim resources
- 28. Lifecycle • System • Home • Mail • Browser Process Home • Map Contacts GMail
- 29. Location Manager
- 30. XMPP Services • Allows any app to send device-to-device messages to other android users • Data Messages are Intents with name/value pairs • Works with any gmail account… • Can also build servers to deliver server-to- device messages
- 32. Notification Manager • How background app interact with users • Consistent notification presentation
- 33. Views
- 34. Views
- 35. Location Manager