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Android
This document provides an overview of Android, including its history and development. It describes what Android is, the typical Android hardware specifications, and some of its key applications like maps, augmented reality, and image/audio search. It also discusses Android's internal components like the Linux kernel, Dalvik virtual machine, and memory structure. The document outlines the Android development environment and process, and covers topics such as activities, services, and building the user interface with XML layouts. It also mentions publishing applications, analytics, vendor customizations, and challenges posed by censorship firewalls.
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Android
- 1. Something about Android Leo.liang@gmail.com 2009-12
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- 4. What’s Android Android is a software stack for mobile devices that includes an operating system, middleware and key applications
- 5. History 2003, Startup Android Inc. Aug 2005, Google Buys Android Nov 2007, Open Handset Alliance Nov 2007, First SDK Apr 2008, ADC Oct 2008, First device: T-Mobile G1 Oct 2008, Open source
- 6. Roadmap HTC HTC HTC HTC Motorola SonyEricsson Dream (G1) Magic Hero Tattoo Droid Xepria X10 1.0 1.1 1.5 1.6 2.0 2.1 Cupcake Donut Eclair Flan
- 7. Typical Hardware Spec Touch screen (480x320, QVGA, WVGA) Video/still camera GPS Accelerometer Magnetometer Enable the User Experience
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- 9. Cool Application Location Based Map + GPS + POI Place Directory Google Maps
- 10. Cool Application Augmented Reality Wikitude World Browser Google Sky Map
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- 12. Cool Application Audio &Image Search
- 13. Cool Application Use Picturesto Search the Web
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- 15. DNA of Android Built on the Linux kernel Uses the Dalvik virtual machine Core and 3rd party applications have equal access
- 16. Process One Linux process per application Application runs in Dalvik VM Application head limit: 16MB Dalvik VM Dalvik VM Auto GC Application A Application B Multi-thread supported Linux process Linux process
- 17. Process Lifecycle Android is a multitasking system But you can only start an application, can’t stop an application System will automatically kill processes to conserve memory on necessary Activity can save state on destroy and restore state on restart to keep seamless user experience Where is the close button? Last activated applications Some of them might have been killed
- 18. Memory SD card ext2 / ext3 Swap FAT / FAT32 (app2sd) GPU Baseband RAM Linux memory used used Flash Memory File System Apps OTA upgrade Recovery SPL Image /dev /system /data /cache … SPL: secondary program loader (boot loader)
- 19. Custom ROM JesusFreke’s ROM Haykuro Rogers ROM (神童) Chinese: GeesunMod
- 20. Root Linux OS root user privilege Why to root? Full control over your system Ability to alter system files. Run special apps that need more control over the system App2sd …… How to root?
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- 22. Development Environment SDK = libraries + tools + emulator + doc SDK add-on: Google Maps API Development Environment Eclipse + ADT plugin Tools + Ant
- 23. Build Process &Artifacts
- 24. Android Application Fundamentals Fundamentals Activity intent intent Service Broadcast receiver Content provider Intent Running in background Music play service
- 25. Activities & Tasks Task: a stack of activities A task can contain activities from different applications Back button navigates Task Task backward in the stack All the activities in a task move together as a unit
- 26. User Interface View & ViewGroup XML layout file Create object in code
- 27. API Android Specified System UI SQLite JDK HttpClient JSON XML Add-on Google Map API
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- 29. After Published Mobile Advertising for Mobile Application Flurry.com Mobile application analytics
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- 32. Vendor Customization Motorola Blur HTC Sense SonyEricsson Rachael Other bundle Applications applications (Gmail, Calendar, Market etc) Replace UI Applications Google Account Android (Open Source)
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- 34. OMS (OPhone) Applications JIL Widget (Gmail, Calendar, Market etc) Replace UI Applications Google Account Android Applications (Open Source)
- 35. GFW Android mobile is Internet mobile Google services Application as front-end, web service back-end Cloud computing DNS pollution: android.clients.google.com VPN support in Android