Android Programming made easy
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This document provides an overview of Android programming. It discusses Android's software layers, the Dalvik virtual machine, the Android developer toolchain including Eclipse and emulators, basic programming constructs like activities, intents, services, and broadcast receivers. It also touches on security, performance considerations, and connectivity APIs. The presentation aims to introduce developers to Android programming in under an hour.
Android Programming made easy
- 1. Android Programming made easyI have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone- BjarneStronstrup
- 3. About me – Lars Vogel (Twitter: @vogella)Independently active in the OpenSource Community, e.g. Eclipse and AndroidWorking for SAP AG as Product ManagerMaintains http://www.vogella.de Java, Eclipse and Android related Tutorials with ~15 000 visitors perReceived the Eclipse Top Contributor Award 2010
- 4. The next 58 minutesAndroid overviewAndroid Tool chainDemosAndroid Programming ConstructsQ&A
- 5. What is Android?– operating system based on Linux– middleware – key applications – set of APIsOpen Source Developed officially by the Open Handset Alliance lead by Google
- 8. Dalvik – town in icelandAndroid ProgrammingYou use the Java programming language but Android does not run Java BytecodeTool dx converts Java Bytecode into Dalvik Executable Code (.dex)
- 9. Android ProgrammingYou use the Java programming language but Android does not run Java Bytecode
- 10. CallsUses
- 12. Android Development Tools (ADT) for EclipseNot OpenSource Eclipse based tooling Provide the emulator
- 13. Wizard for creating new project
- 14. Additional ToolingEmulatorQEMU-based ARM emulator runs same image as a deviceUse same toolchain to work with device or emulatorInital startup is slooooowwwwww.....
- 15. Your first Android app in < 60 secsTimer check Application
- 16. Command lineadb – Android Debugging Bridgetelnet
- 18. Main Android programming constructsActivityViewsIntentsBroadcast ReceiverServicesContentProvider
- 19. Activity – screen in the Android applicationLayout – Defines UI elements and their arrangements.
- 20. Life Cyle of an Activityvoid onCreate(Bundle savedInstanceState) void onStart() void onRestart() void onResume() void onPause() void onStop() void onDestroy()Android may destroy you!
- 21. Noteworthy:- ADT maintains the ID‘s automatically in R.java- Resources can be defined via xml
- 22. I had only the best intents....
- 23. Intents Allow modular architecture
- 24. Two types
- 25. Explicit: Asking someone to do something
- 26. Implicit: Asking the system who can do something Intent
- 27. Services© Lars Vogel and others, Licensed under Creative Commons by-nc-nd-3.0 (de)
- 28. ServicesAndroid provides a multitude of system services NotificationService
- 29. VibratorService
- 30. LocationService
- 31. AlarmService
- 32. ....Access via context.getSystemService(Context.CONST);You can define your own service.
- 33. Broadcast Receiver – Listen to system events Example: BATTERY_LOW, ACTION_BOOT_COMPLETEDDefined statically in manifest or temporary via code
- 34. Timer check ApplicationLets alert!
- 35. Security
- 36. Android Application requires explicit permissions, e.g. for DB access
- 37. Phone access
- 38. Contacts
- 39. Internet
- 40. System messagesSecurity is an inherent part of the system and not a layer the programmer needs to handle
- 42. Android ConnectivityI can talk and hearInternet (java.net, Apache HttpClient,...)BluetoothEmailSMSI have feelingsCamera APIMotion DetectionLocation API (GIS)Heat SensorAccelerator
- 43. StorageFile System (device or SD card)PreferencesDatabase (SQLightDatabase)
- 44. Beyond Android – Google API‘s
- 45. Performance?
- 46. Performance SinsAvoid creating objectsStatic rulesAvoid to use internal setters and getter (within the same class)Static final for constantsLearn on giants (use the libraries)Details: http://developer.android.com/guide/practices/design/performance.html
- 47. Be fast!Avoid ApplicationNotResponding ErrorThreads not allowed to modify the UI directlyUse handler or AsyncTask to update the UI after Thread is done
- 48. SummaryAndroid powerful and well-designed development platformPower to the developer
- 49. Picture Credit All pictures are from http://www.sxc.hu/ to get them add the number to http://www.sxc.hu/photo/Agenda 1089869Dalvik 1269657Software Layer / Tomatos 832159616474Thinking guy 324541Smiling Boy 812138Toolchain 1197009Stopwatch http://www.sxc.hu/photo/634598Timer / Watches 1062014Next guy 986700Sad Lady 232738Funny guy 1173019Waiter / Services http://www.sxc.hu/photo/157966Security 695054There is more 702367Performance rabbits 786444
- 50. Performance snail 1181451
- 51. Performance Running man 377100
- 52. Hang-man 620961
- 56. Thank you http://www.sxc.hu/photo/986313Android: Where to go from here:Android Tutorial http://www.vogella.de/articles/Android/article.htmlOr Google for: ~1 rank“android development tutorial”
- 58. Thank youFor further questions:[email protected]://www.vogella.dehttp://www.twitter.com/vogella
- 59. License & AcknowledgementsThis work is licensed under the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Germany LicenseSee http://creativecommons.org/licenses/by-nc-nd/3.0/de/deed.en_US