Android introduction&hello world
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This document provides an overview of Android and how to create a "Hello World" Android app. It discusses the background and architecture of Android, including its application building blocks and life cycle. It also describes the developer toolchain, including Eclipse IDE, Android SDK, and emulator. The document concludes with instructions for creating a basic "Hello World" app to display text on the Android emulator.
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The document provides an overview of the Android operating system. It discusses Android's history as a project started by Android Inc. and acquired by Google in 2005. It describes Android's architecture based on a Linux kernel, use of the Dalvik virtual machine for apps written in Java, and open source development model. The document also covers key Android features, the app lifecycle, and development tools like the Android SDK.
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Android introduction&hello world
- 1. Android introduction &My first android app (hello world) 2010/11/23 made by John
- 2. What we want from Android?
- 3. Agenda Background Androidology : Architecture Overview Androidology : Application Building Blocks Androidology : Reusing & Replacing Compnts Androidology : Application Life Cycle Androidology : APIs Brief View Developer Tool chain My first Android App : HelloWorld Q & A
- 4. Background (1) Source: International Telecommunication Union
- 5. Background (2) Android continues to put in a powerful performance as measured by the share of mobile web consumption In August Android took share from every corner of the market, putting in its best month share gain since November 2009
- 8. Android has been available under a free software / open source license since 21 October 2008. Google published the entire source code (including network and telephony stacks)[34] under an Apache License.Google on Purchasing Android Inc: “Best Deal Ever” For those of you that don’t know, Android and its mobile operating system was once separate from Google. In 2005, Google “quietly” acquired Android for what’s estimated to be around $50 million USD – a good hunk of their acquisition money that year, the whole lump being somewhere around $130 million. Now, at a panel at the 16th annual Stanford Accel Symposium, vice president of corporate development at Google David Laweesaid that the pickup of Android was Google’s “best deal ever.” Copyleft : copyleft is a general method for making a program (or other work) free, and requiring all modified and extended versions of the program to be free as well. Allows vendors to add proprietary extensions without submitting them back to the open source community.
- 10. Source available after first handsets ship
- 11. Anyone will be able to build a system image
- 12. Users have control of their experience
- 13. They control what gets installed
- 14. They choose the defaults
- 15. Don’t need permission to ship an application
- 16. No hidden or privileged framework APIs
- 17. Can integrate, extend and replace existing componentsUser Industry
- 18. Architecture Overview GUI Design DB UI ≈ J2SE mp3, mp4 Open source WebKit is a layout engine designed to allow web browsers to render web pages.
- 19. Application Building Blocks
- 20. Reusing & Replacing Compnts “Record voice” Photo Gallery Home “Pick photo” Picasa “Browsing” Client component makes a request for a specific action. “Media play” Player “Send mail” GMail ToDo “Word processing”
- 21. Reusing & Replacing Compnts
- 22. Applications run in their own process. Process are started and stopped as needed to run an application’s component. Process may be killed to reclaim resources. Application Life Cycle
- 23. Application Life Cycle (1) System Process Home Process Home Mail Process Browser Process Map Process Mail Message Map Browser
- 24. Application Life Cycle (2) System Process Home Process Home Map Process Browser Process Mail Process Browser Map Message Mail
- 25. APIs Brief View
- 27. Eclipse IDE
- 28. ADT (Android Development Tools plug in)
- 29. Android SDK (Include Emulator)安裝 Android 開發工具
- 30. Developer Tool Chain (2)
- 31. Appendix Android 官方網站 http://www.android.com/ 開放手持裝置聯盟(Open Handset Alliance) http://www.openhandsetalliance.com/ Google Android 開發者部落格 http://android-developers.blogspot.com/ Android 開發者大賽網站 http://code.google.com/android/adc.html Android 文件 http://developer.android.com/ http://www.onlamp.com/pub/a/onlamp/2007/11/12/goog...ing-inside-the-gphone-sdk.html CNet專訪：Google手機平台背後的原創者 http://www.zdnet.com.tw/news/comm/0,2000085675,20125898,00.htm Android 原始碼網站 http://source.android.com Android 相關事件時間表 http://www.androidacademy.com/4-android-timeline 深入淺出 Android -- Google 手持設備應用程式設計入門