Android application development
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This document provides an overview of Android application development. It discusses the Android platform architecture including the Linux kernel, libraries, Android runtime and application framework. It describes application building blocks like activities, intents, services and content providers. It outlines the course objectives to introduce mobile application development, the Android platform and tools. It also discusses the emulator, application lifecycle, location manager, notifications and common views used for building user interfaces.
Android application development
- 2. Java • Basic Java programming – Exceptions – Inner Class, Interface • Advanced topics we will touch: – Java IO – Java Thread – Java Socket Darshan Gohel
- 4. Course Objectives • Mobile Application Development (MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Textbook: Hello, Android Darshan Gohel
- 5. Few reasons to go MAD… • Smart Phones – Internet access anywhere – Social networking • Millions of mobile users • Open standards Darshan Gohel
- 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 Darshan Gohel
- 8. Linux Kernel • Works as a HAL • Device drivers • Memory management • Process management • Networking Darshan Gohel
- 9. Libraries • C/C++ libraries • Interface through Java • Surface manager – Handling UI Windows • 2D and 3D graphics • Media codecs, SQLite, Browser engine Darshan Gohel
- 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… Darshan Gohel
- 11. Application Framework • API interface • Activity manager – manages application life cycle. Darshan Gohel
- 12. Applications • Built in and user apps • Can replace built in apps Darshan Gohel
- 13. Course Objectives • Mobile Application Development (MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Textbook: Hello, Android Darshan Gohel
- 14. Application Building Blocks • Activity • IntentReceiver • Service • ContentProvider Darshan Gohel
- 15. Activities • Typically correspond to one UI screen • But, they can: – Be faceless – Be in a floating window – Return a value Darshan Gohel
- 16. IntentReceivers • Components that respond to broadcast ‘Intents’ • Way to respond to external notification or alarms • Apps can invent and broadcast their own Intent Darshan Gohel
- 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 Darshan Gohel
- 18. Intents GMail Contacts Home Blogger Chat Client component makes a request for a specific action “Pick photo” System picks best component for that action New components can use existing functionality Blogger Photo Gallery Darshan Gohel
- 19. Services • Faceless components that run in the background – E.g. music player, network download etc… Darshan Gohel
- 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 Darshan Gohel
- 21. Course Objectives • Mobile Application Development (MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Textbook: Hello, Android Darshan Gohel
- 22. Development Tools • Eclipse • Android SDK 2.0 or higher developer.android.com Darshan Gohel
- 23. The Emulator • QEMU-based ARM emulator • Runs the same image as the device • Limitations: – No Camera support Darshan Gohel
- 25. Hello World • A great starting point: 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 Darshan Gohel
- 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 Darshan Gohel
- 27. Darshan Gohel
- 28. Lifecycle • System Process GMail Contacts Home • Home • Mail • Browser • Map Darshan Gohel
- 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 Darshan Gohel
- 32. Notification Manager • How background app interact with users • Consistent notification presentation Darshan Gohel