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1、附录AnAnalysisandComparisonofOpenandClosedMobilePlatformsAndroidvs.iPhone1.IntroductionInrecentyears,thepopularityofsmartphonekeptgoingup.Moreandmoresmartphonesaresoldandalotofpeopleareembracingthem.Smartphonesbroughtgreatconveniencetousers,aswellcreatedopportunitiesforsmartphoneres
2、earchers.That’stosay,thewidespreadofsmartphonesbenefitedbothsides.Atthesametime,developingofsmartphoneOSbecomesoneofthesmartestindustry.TobeasmartphoneOS,thesystemshould:1.ProvideserviceslikeaPC.2.WorkwithaGPUforbettervisualeffects.3.AllowtheusertosurfonInternetfreely.Andapparentl
3、y,there’realsosomeweaknesses:1.Limitedbattery.2.PoorCPUperformanceagainstPCCPU.3.Smallstorage.4.TheuseofRAMmayleadstolossofdatawhenthephonerunsoutofbatteryNowthe2giantsofsmartphoneOSareAndroidandiPhoneOS.Ononeside,AndroidisbasedonLinuxkernelandDalvikvirtualmachine,anditisopensourc
4、ed.TheupperlayerofAndroidisJavabased,allowingdeveloperstodevelopAndroidapplicationswithGoogleSDKandselltheirsoftwareinAndroidMarket.Ontheotherside,iPhoneOS,whichbasesonUnixkernelandDarwinmodelbutisclosedsourced,evolvesfromMacOSXandisthedefaultOSofiPhone,iPodTouchandiPad.ObjectiveC
5、basedsoftwarecanruniniPhoneOS,andjustlikeAndroid,youcandevelopyourowniPhoneapplicationsanduploadthemontoApple’s‘AppStore’forsale.BycomparingthelatestAndroidandiPhoneOS,Android2.2FroyoandiOS4,wecantakeaglimpseatthemainfeatureofopenandclosedsmartphoneOSs.Whilethe2OSsaredesignedinrat
6、herdifferentmentalityandfunctionality,it’salittleearlytotellwhichoneisbetter.2.SmartPhoneOS2.1.AndroidThesystemarchitectureofAndroidconsistsof5layers,whichareLinuxKernel,AndroidRuntime,Libraries,ApplicationFrameworkandApplications,frombottomtotop.Androidprovidescoreserviceslikesec
7、urity,memorymanagement,processmanagement,networkstackanddrivers,basingonLinux2.6.Beingtheabstractlayerbetweensoftwareandhardware,thelayerofLinuxKernelhidestheimplementingdetailsofhardwareandprovidesintegratedservicesforupperlayer.DalvikvirtualmachineandJavacorelibrariesareincluded
8、inthelayerofAndroidRuntime,provid