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Android overview
 

Android overview

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  • named after a robot in  Bladerunner
  •   Open Handset Alliance , a consortium of 47  hardware ,  software , and  telecom  companies devoted to advancing  open standards  for mobile devices. Includes  Texas Instruments ,  Broadcom Corporation ,  Google , HTC, Intel, LG, Marvell Technology Group, Motorola, Nvidia, Qualcomm, Samsung Electronics, Sprint Nextel and T-Mobile
  • The linux kernel 2.6 is the hardware abstraction layer (HAL) between the hardware and the android software stack.
  • Maybe more profitable with ads than actually selling the app

Android overview Android overview Presentation Transcript

  • Android OverviewDr. Josh DehlingerDr. Siddharth Kaza
  • Why Mobile App Development? The fact that we can! Only a few years ago you had tobe in the Motorola inner circle to do it! Mobile platform is the platform of the future Double-digit growth in world-wide smartphone ownership3 Job market is hot Market for mobile software surges from $4.1 billion in 2009 to$17.5 billion by 20121 2010 Dice.com survey: 72% of recruiters looking for iPhone appdevelopers, 60% for Android1 Dice.com: mobile app developers made $85,000 in 2010 andsalaries expected to rise2 Students (and faculty!) are naturally interested!1 http://www.businessweek.com/technology/content/oct2010/tc20101020_639668.htm2 http://it-jobs.fins.com/Articles/SB129606993144879991/Mobile-App-Developers-Wanted-at-Ad-Agencies3http://www.gartner.com/it/page.jsp?id=1466313
  • Why Android? A lot of students have them 2010 survey by University of CO1: 22% of collegestudents have Android phone (26% Blackberry, 40%iPhone) Gartner survey2: Android used on 22.7% ofsmartphones sold world-wide in 2010 (37.6%Symbian, 15.7% iOS) Students already know Java and Eclipse Low learning curve CS0 students can use App Inventor for Android1http://testkitchen.colorado.edu/projects/reports/smartphone/smartphone-appendix1/2http://www.gartner.com/it/page.jsp?id=1543014
  • Why Android? Transferring app to phone is trivial Can distribute by putting it on the web Android Market for wider distribution• It’s not 1984
  • Types ofAndroidDevices
  • Various Android Phoneshttp://cloud.addictivetips.com/wp-content/uploads/2010/09/and
  • Galaxy Tablethttp://www.samsung.com/global/microsite/galaxytab/10.1/index.html
  • Android-Powered Microwavehttp://www.pocket-lint.com/news/30712/android-powered-microwave-cooking-googleBy Touch Revolution – at CES 2010
  • http://www.google.com/nexus/Google/Samsung Galaxy Nexus
  • Brief History 1996 The WWW already had websites with color andimages But, the best phones displayed a couple of linesof monochrome text! Enter: Wireless Application Protocol (WAP) – stripped downHTTP for bandwidth reduction Wireless Markup Language (WML) – stripped downHTML for content
  • Brief History Many issues (WAP = “Wait And Pay”) Few developers to produce content (it wasn’t fun!) Really hard to type in URLs using the smallkeyboards Data fees frightfully expensive No billing mechanism – content difficult tomonetize Other platforms emerged Palm OS, Blackberry OS, J2ME, Symbian(Nokia), BREW, OS X iPhone, Windows Mobile
  • Brief History - Android 2005 Google acquires startup Android Inc. to start Android platform Work on Dalvik VM begins 2007 Open Handset Alliance announced Early look at SDK 2008 Google sponsors 1stAndroid Developer Challenge T-Mobile G1 announced SDK 1.0 released Android released open source (Apache License) Android Dev Phone 1 released
  • Brief History cont. 2009 SDK 1.5 (Cupcake) New soft keyboard with “autocomplete” feature SDK 1.6 (Donut) Support Wide VGA SDK 2.0/2.0.1/2.1 (Eclair) Revamped UI, browser 2010 Nexus One released to the public SDK 2.2 (Froyo) Flash support, tethering SDK 2.3 (Gingerbread) UI update, system-wide copy-paste
  • HoneycombAndroid3.0-3.Brief History cont. 2011 SDK 3.0/3.1/3.2 (Honeycomb) for tablets only New UI for tablets, support multi-core processors SDK 4.0/4.0.1/4.0.2/4.0.3 (Ice Cream Sandwich) Changes to the UI, Voice input, NFCIce cream SandwicAndroid 4.0+
  • The Android DeveloperWebsite http://developer.android.com/index.html This should be your homepage for the nextsemester!
  • Distribution of DevicesData collected during a 14-day period ending on January 3, 2012http://developer.android.com/resources/dashboard/platform-versions.html
  • What is Google Android? A software stack for mobile devices that includes An operating system Middleware Key Applications Uses Linux to provide core system services Security Memory management Process management Power management Hardware drivers
  • Android ArchitectureMore details at: http://developer.android.com/guide/basics/what-is-android.html
  • Mobile Devices: Advantages (ascompared to fixed devices) Always with the user Typically have Internet access Typically GPS enabled Typically have accelerometer & compass Most have cameras & microphones Many apps are free or low-cost
  • Mobile Devices: Disadvantages Limited screen size Limited battery life Limited processor speed Limited and sometimes slow network access Limited or awkward input: soft keyboard, phonekeypad, touch screen, or stylus Limited web browser functionality Range of platforms & configurations acrossdevices
  • Mobile Applications What are they? Any application that runs on a mobile device Types Web apps: run in a web browser HTML, JavaScript, Flash, server-side components,etc. Native: compiled binaries for the device Often make use of web services
  •  Developmentprocess for anAndroid apphttp://developer.android.com/guide/developing/index.html
  • Android Apps Built using Java and new SDK libraries No support for some Java libraries like Swing &AWT Oracle currently suing Google over use Java code compiled into Dalvik byte code(.dex) Optimized for mobile devices (better memorymanagement, battery utilization, etc.) Dalvik VM runs .dex files
  • Building and running ADB is a client server program that connects clients on developermachine to devices/emulators to facilitate development. An IDE like Eclipse handles this entire process for you.http://developer.android.com/guide/developing/building/index.html#detailed-buildCompiled resources(xml files)Android Debug Bridge
  • Building and running (moredetails) Expandfigure Android InterfaceDefinitionLanguage (AIDL) –Definitions toexchange databetweenapplications (thinkSOAP)http://developer.android.com/guide/developing/building/index.html#detailed-buildAndroid Asset Packing ToolAllows processes acrossapps to communicate.
  • Applications Are Boxed By default, each app is run in its own Linuxprocess Process started when app’s code needs to beexecuted Threads can be started to handle time-consumingoperations Each process has its own Dalvik VM By default, each app is assigned unique Linux ID Permissions are set so app’s files are only visible tothat app
  • Android Architecture
  • Publishing and Monetizing Paid apps in Android Market, various othermarkets Free, ad-supported apps in Android Market Ad networks (Google AdMob, Quattro Wireless) Sell your own ads Services to other developers Ex. Skyhook Wireless (http://www.skyhookwireless.com/) Contests (Android Developer Challenge) Selling products from within your app
  • Android Market http://www.android.com/market/Has various categories, allows ratingsHave both free/paid appsFeatured apps on web and on phoneThe Android Market (and iTunes/App Store) isgreat for developers Level playing field, allowing third-party apps Revenue sharing
  • Publishing to Android Market Requires Google Developer Account $25 fee Link to a Merchant Account Google Checkout Link to your checking account Google takes 30% of app purchase price
  • Android Design Philosophy Applications should be: Fast Resource constraints: <200MB RAM, slow processor Responsive Apps must respond to user actions within 5 seconds Secure Apps declare permissions in manifest Seamless Usability is key, persist data, suspend services Android kills processes in background as needed
  • Leveraging the web To keep your apps fast and responsive,consider how you can leverage the web What ____________ can be ________ on aserver or in the cloud? Tasks/performed Data/persisted Data/retrieved Beware, data transfer is also expensive and canbe slow
  • Other design principles http://developer.android.com/design/index.html Great reference!
  • Apple vs. Google Open Handset Alliance 30+ technology companies Commitment to openness, shared vision, andconcrete plans Compare with Mac/PC battles Similar (many PC manufacturers, one Apple) Different (Microsoft sells Windows, Google givesaway Android)