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Android Overview




            Tomi.Mickelsson@idean.com
            Senior Technology Specialist
              http://mobiledevcamp.fi/
          http://www.slideshare.net/atomi/
                     Feb 21, 2009

1 / 36
Agenda
•    Why Android?
•    What is it?
•    SDK and tools
•    UI and widgets
•    Resources, animation
•    Debugging, packaging
•    Market
•    Demo: Spin the Bottle app




2 / 36
What is Android?
• modern open-source mobile operating system
• full software stack
         – Linux kernel 2.6
         – Java middleware, framework
         – core applications
• Google & OHA




3 / 36
Why Android?
• open-source
         – apache license
         – cost
         – sets developers free
• solid foundation: Linux kernel
• good framework based on Java
• empower users
         – replace core apps
         – personalize
• Google stuff
• huge opportunity for vendors, developers, users
         – OS for free, innovate at app level
• not just for phones

4 / 36
Building blocks




5 / 36
Java Framework
• Java: reasonable choice
         – mainstream language
         – millions of developers
• J2SE, not J2ME
• Dalvik VM: fast register based VM
• modular app architecture
         – building screens and services, not monolithic black-boxes
         – loosely coupled, addressable parts
•   every app runs its own process
•   multitasking; background processes
•   JNI discouraged at this point
•   other frameworks possible


6 / 36
Quickstart
•    install JDK 1.5
•    install Android SDK
•    install eclipse
•    read SDK docs
•    learn about samples, API demos
•    get help from newsgroup
•    read sources for advanced stuff
•    test on G1 or dev phone
•    publish app in Market




7 / 36
SDK
• all platforms supported
         – linux, windows, mac
•   no installation, just unzip
•   81.4MB - ver1.1
•   clean and compact
•   good documentation
•   1.1 latest version




8 / 36
Eclipse Editor
• most popular
  Java editor
         –   tons of features
         –   refactoring
         –   debugging
         –   integrated help
• ADT: Android
  Development
  Tools plugin




9 / 36
Emulator




10 / 36
Emulator
• based on QEMU emulator for ARM processor
          – boots up real linux kernel
•    camera previews
•    easy networking
•    audio recording
•    switch orientation: CTRL+F12
•    install apps with browser or adb
•    market app not available
•    skins




11 / 36
Tools in SDK
• all tools available as cmdline
      – eclipse not required
• adb - Android Debug Bridge
      –   adb push - transfer files from/to emulator
      –   adb install - install app
      –   adb logcat - view debug log
      –   adb shell - linux shell access
•    aapt - Android Asset Packaging Tool
•    ddms
•    draw9patch
•    mksdcard
•    hierarchyviewer
•    sqlite
12 / 36
Tools - adb shell
• live shell access to emulator file system




13 / 36
Tools - cpuinfo




14 / 36
3rd party tools - UI builder
• http://www.droiddraw.org/
• create UI visually




15 / 36
3rd party tools - Sensor simulator
• http://code.google.com/p/openintents/wiki/SensorSimulator
• feed sensor data to emulator




16 / 36
Source code
•    quot;use the source, Luke!quot;
•    http://source.android.com/
•    GIT version control
•    whole package 2.1GB
•    just to peek at some files:
      – http://android.git.kernel.org/
      – http://www.google.com/codesearch
• sources for core apps: launcher,
  browser...
      – great for learning advanced stuff!




17 / 36
App Architecture
• Activity
      – visible screens
• Service
      – background services
• Content Provider
      – shared data
• Broadcast receivers
      – receive and react to broadcasted events
• Intent
      – activating components




18 / 36
UI
• rich Java UI API
      – layouts and widgets
• declarative programming ala XML
• customization features
      – inherit and override a base widget
      – combine existing widgets
      – fully draw yourself - View::onDraw(Canvas canvas)
• designed for touch right from start
      – padmode, touhmode
      – context menu with a long touch
• focus management
• OpenGL
• may not beat iPhone, but foundation ok for future

19 / 36
Layouts
•   container for widgets
•   XML party; similar to web's XHTML
•   widgets refered from code with IDs
•   relative layouts, fits in various screens
•   AbsoluteLayout discouraged




20 / 36
Widgets
• great number of
  widgets
• android.widgets.*




21 / 36
Widgets - ListView
• most common widget; the workhorse
      – learn well
•   scroll and fling
•   list fading at ends
•   scrollbar on off
•   cache optimization




22 / 36
Widgets - Webkit
•   embedded browser
•   fetch local or remote content
•   Javascript and AJAX supported
•   bridge for Java/Javascript communication




23 / 36
Widgets - MapView
• location-based apps will be hot
• maps built-in
• based on Google Maps




24 / 36
Resources
• images, audio, video, strings, layouts,
  themes, color values
• divided into logical dir hierarchy
• fetch from code
      –   drawables: Resources.getDrawable()
      –   XML: Resources.getXML()
      –   strings: Resources.getString()
      –   raw: Resources.openRawResource()
• intelligent resource matching
      –   values-en/, values-fr/
      –   drawable-land/
      –   drawable-nokeys/
      –   drawable-en-finger/
• XML all over
25 / 36
9-Patch Bitmaps
• image stretching for widgets
• embedded padding measurements




26 / 36
Animation
• in-built animation framework
• all views animable, View.StartAnimation()
• tweened anim
      – scale, alpha, transition, rotation
• frame-by-frame anim
      – list images




27 / 36
App Data
• sandboxed file system
      – adb push, pull
• preferences
• SQLite
• SDcard for bigger files




28 / 36
Debugging
• Eclipse & DDMS
      – DDMS: Dalvik Debug Monitor Server tool
• breakpoints and watches
• actual device debugged via USB




29 / 36
Security
• linux user account per app
• based on app permissions
• apps are signed by developer private key
      – no central authority
• why signing at all:
      – two sibling apps can share data (process and userid)
      – upgrade also smooth, same key




30 / 36
Delivery - APK
•    zip file
•    Java .class converted to .dex
•    XML-files compressed into binary form
•    manifest for app permissions
•    signed with developer private key
•    developer public key included
•    assets packaged as is




31 / 36
Market
• since Oct08, free apps only
• payment system for US/UK developers Feb09
      – Google Checkout system
• 25$ registration fee per developer
• developer gets 70%
• price range $0.99 - $200
      – quot;I'm rich!quot;-apps disallowed
•   over 13y of age
•   24h money-back
•   no explicit content
•   upgrade logic for apps
•   user ratings
•   uninstall percentage
32 / 36
Future
• new versions coming
      – SDK 1.1 just released
      – quot;cupcakequot; in the works
• new phones coming
      –   G2 from HTC
      –   Huawei 2H09
      –   Samsung 2H09
      –   O2: 6-8 phones 2H09?
      –   Dell, Acer?
• Innovations, cool apps




33 / 36
Demo - Spin the Bottle
•   experimental fun app, quot;turhakequot;
•   available in Android Market for free
•   10000 downloads in 44hours
•   22000 downloads in 10 days
•   rating 3.78/5




34 / 36
Why be a mobile developer?
• innovation hotspot
• 4B subscriptions in the world
• quot;mother of all marketsquot;




35 / 36
Thank you
• See you around at dev camp




36 / 36

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Android Overview

  • 1. Android Overview Tomi.Mickelsson@idean.com Senior Technology Specialist http://mobiledevcamp.fi/ http://www.slideshare.net/atomi/ Feb 21, 2009 1 / 36
  • 2. Agenda • Why Android? • What is it? • SDK and tools • UI and widgets • Resources, animation • Debugging, packaging • Market • Demo: Spin the Bottle app 2 / 36
  • 3. What is Android? • modern open-source mobile operating system • full software stack – Linux kernel 2.6 – Java middleware, framework – core applications • Google & OHA 3 / 36
  • 4. Why Android? • open-source – apache license – cost – sets developers free • solid foundation: Linux kernel • good framework based on Java • empower users – replace core apps – personalize • Google stuff • huge opportunity for vendors, developers, users – OS for free, innovate at app level • not just for phones 4 / 36
  • 6. Java Framework • Java: reasonable choice – mainstream language – millions of developers • J2SE, not J2ME • Dalvik VM: fast register based VM • modular app architecture – building screens and services, not monolithic black-boxes – loosely coupled, addressable parts • every app runs its own process • multitasking; background processes • JNI discouraged at this point • other frameworks possible 6 / 36
  • 7. Quickstart • install JDK 1.5 • install Android SDK • install eclipse • read SDK docs • learn about samples, API demos • get help from newsgroup • read sources for advanced stuff • test on G1 or dev phone • publish app in Market 7 / 36
  • 8. SDK • all platforms supported – linux, windows, mac • no installation, just unzip • 81.4MB - ver1.1 • clean and compact • good documentation • 1.1 latest version 8 / 36
  • 9. Eclipse Editor • most popular Java editor – tons of features – refactoring – debugging – integrated help • ADT: Android Development Tools plugin 9 / 36
  • 11. Emulator • based on QEMU emulator for ARM processor – boots up real linux kernel • camera previews • easy networking • audio recording • switch orientation: CTRL+F12 • install apps with browser or adb • market app not available • skins 11 / 36
  • 12. Tools in SDK • all tools available as cmdline – eclipse not required • adb - Android Debug Bridge – adb push - transfer files from/to emulator – adb install - install app – adb logcat - view debug log – adb shell - linux shell access • aapt - Android Asset Packaging Tool • ddms • draw9patch • mksdcard • hierarchyviewer • sqlite 12 / 36
  • 13. Tools - adb shell • live shell access to emulator file system 13 / 36
  • 15. 3rd party tools - UI builder • http://www.droiddraw.org/ • create UI visually 15 / 36
  • 16. 3rd party tools - Sensor simulator • http://code.google.com/p/openintents/wiki/SensorSimulator • feed sensor data to emulator 16 / 36
  • 17. Source code • quot;use the source, Luke!quot; • http://source.android.com/ • GIT version control • whole package 2.1GB • just to peek at some files: – http://android.git.kernel.org/ – http://www.google.com/codesearch • sources for core apps: launcher, browser... – great for learning advanced stuff! 17 / 36
  • 18. App Architecture • Activity – visible screens • Service – background services • Content Provider – shared data • Broadcast receivers – receive and react to broadcasted events • Intent – activating components 18 / 36
  • 19. UI • rich Java UI API – layouts and widgets • declarative programming ala XML • customization features – inherit and override a base widget – combine existing widgets – fully draw yourself - View::onDraw(Canvas canvas) • designed for touch right from start – padmode, touhmode – context menu with a long touch • focus management • OpenGL • may not beat iPhone, but foundation ok for future 19 / 36
  • 20. Layouts • container for widgets • XML party; similar to web's XHTML • widgets refered from code with IDs • relative layouts, fits in various screens • AbsoluteLayout discouraged 20 / 36
  • 21. Widgets • great number of widgets • android.widgets.* 21 / 36
  • 22. Widgets - ListView • most common widget; the workhorse – learn well • scroll and fling • list fading at ends • scrollbar on off • cache optimization 22 / 36
  • 23. Widgets - Webkit • embedded browser • fetch local or remote content • Javascript and AJAX supported • bridge for Java/Javascript communication 23 / 36
  • 24. Widgets - MapView • location-based apps will be hot • maps built-in • based on Google Maps 24 / 36
  • 25. Resources • images, audio, video, strings, layouts, themes, color values • divided into logical dir hierarchy • fetch from code – drawables: Resources.getDrawable() – XML: Resources.getXML() – strings: Resources.getString() – raw: Resources.openRawResource() • intelligent resource matching – values-en/, values-fr/ – drawable-land/ – drawable-nokeys/ – drawable-en-finger/ • XML all over 25 / 36
  • 26. 9-Patch Bitmaps • image stretching for widgets • embedded padding measurements 26 / 36
  • 27. Animation • in-built animation framework • all views animable, View.StartAnimation() • tweened anim – scale, alpha, transition, rotation • frame-by-frame anim – list images 27 / 36
  • 28. App Data • sandboxed file system – adb push, pull • preferences • SQLite • SDcard for bigger files 28 / 36
  • 29. Debugging • Eclipse & DDMS – DDMS: Dalvik Debug Monitor Server tool • breakpoints and watches • actual device debugged via USB 29 / 36
  • 30. Security • linux user account per app • based on app permissions • apps are signed by developer private key – no central authority • why signing at all: – two sibling apps can share data (process and userid) – upgrade also smooth, same key 30 / 36
  • 31. Delivery - APK • zip file • Java .class converted to .dex • XML-files compressed into binary form • manifest for app permissions • signed with developer private key • developer public key included • assets packaged as is 31 / 36
  • 32. Market • since Oct08, free apps only • payment system for US/UK developers Feb09 – Google Checkout system • 25$ registration fee per developer • developer gets 70% • price range $0.99 - $200 – quot;I'm rich!quot;-apps disallowed • over 13y of age • 24h money-back • no explicit content • upgrade logic for apps • user ratings • uninstall percentage 32 / 36
  • 33. Future • new versions coming – SDK 1.1 just released – quot;cupcakequot; in the works • new phones coming – G2 from HTC – Huawei 2H09 – Samsung 2H09 – O2: 6-8 phones 2H09? – Dell, Acer? • Innovations, cool apps 33 / 36
  • 34. Demo - Spin the Bottle • experimental fun app, quot;turhakequot; • available in Android Market for free • 10000 downloads in 44hours • 22000 downloads in 10 days • rating 3.78/5 34 / 36
  • 35. Why be a mobile developer? • innovation hotspot • 4B subscriptions in the world • quot;mother of all marketsquot; 35 / 36
  • 36. Thank you • See you around at dev camp 36 / 36