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AnAnalysisandComparisonofOpenandClosedMobile

Platforms

Abstract

WiththereleaseofAndroid2.2FroyoandiPhone4,thewarbetweenopenandclosedmobileplatformstendstobefiercer.Beingtherepresentativesofthetwoparties,FroyoandiOS4arequitedifferentatsystemframework,newfeature,applicationmarketandintegrationmodel.AccordingtothecompanyspiritsofGoogleandApple,wedosomeanalysesandcomparisonsoftheabovepoints,explainthedifferencesofAndroidandiPhonefromtheshallowertothedeeper,thenconcludethecharacteristicsofopenandclosedmobileplatforms,aimingatprovidinganobjectivereferenceforresearchersofmobileplatforms,helpingthemseeclearerintomobileindustry.Asaresult,bothFroyoandiOS4havetheiradvantagesanddisadvantages,stilltheyarefarfrombeingperfect,there’sroomforfurtherimprovement.

Keywords:

Android；

iPhone；

Froyo；

iOS4；

smartphone；

mobileplatform

1.Introduction

Inrecentyears,thepopularityofsmartphonekeptgoingup.Moreandmoresmartphonesaresoldandalotofpeopleareembracingthem.Smartphonesbroughtgreatconveniencetousers,aswellcreatedopportunitiesforsmartphoneresearchers.That’stosay,thewidespreadofsmartphonesbenefitedbothsides.Atthesametime,developingofsmartphoneOSbecomesoneofthesmartestindustry.TobeasmartphoneOS,thesystemshould:

1.ProvideserviceslikeaPC.2.WorkwithaGPUforbettervisualeffects.3.AllowtheusertosurfonInternetfreely.Andapparently,there’realsosomeweaknesses:

1.Limitedbattery.2.PoorCPUperformanceagainstPCCPU.3.Smallstorage.4.TheuseofRAMmayleadstolossofdatawhenthephonerunsoutofbattery

Nowthe2giantsofsmartphoneOSareAndroidandiPhoneOS.Ononeside,AndroidisbasedonLinuxkernelandDalvikvirtualmachine,anditisopensourced.TheupperlayerofAndroidisJavabased,allowingdeveloperstodevelopAndroidapplicationswithGoogleSDKandselltheirsoftwareinAndroidMarket.Ontheotherside,iPhoneOS,whichbasesonUnixkernelandDarwinmodelbutisclosedsourced,evolvesfromMacOSXandisthedefaultOSofiPhone,iPodTouchandiPad.ObjectiveCbasedsoftwarecanruniniPhoneOS,andjustlikeAndroid,youcandevelopyourowniPhoneapplicationsanduploadthemontoApple’s‘AppStore’forsale[1][2][3][4].

BycomparingthelatestAndroidandiPhoneOS,Android2.2FroyoandiOS4,wecantakeaglimpseatthemainfeatureofopenandclosedsmartphoneOSs.Whilethe2OSsaredesignedinratherdifferentmentalityandfunctionality,it’salittleearlytotellwhichoneisbetter.

2.SmartPhoneOS

2.1.Android

ThesystemarchitectureofAndroidconsistsof5layers,whichareLinuxKernel,AndroidRuntime,Libraries,ApplicationFrameworkandApplications,frombottomtotop.

Androidprovidescoreserviceslikesecurity,memorymanagement,processmanagement,networkstackanddrivers,basingonLinux2.6.Beingtheabstractlayerbetweensoftwareandhardware,thelayerofLinuxKernelhidestheimplementingdetailsofhardwareandprovidesintegratedservicesforupperlayer.

DalvikvirtualmachineandJavacorelibrariesareincludedinthelayerofAndroidRuntime,providingmostfunctionsinJavacorelibraries.

ThelayerofLibrariescontainsaclassofC/C++librariesforAndroidcomponents.ThoselibrariesareintegratedbythelayerofApplicationFrameworkandthenprovidedtodevelopers.

ThelayerofApplicationFrameworkprovidesallkindsofmodulesforprograminitializationtosimplifytheuseofcomponents,allowingdevelopersdowhatevertheywantandprovideservicesforothersoftwares,underthelimitationofsecurity,ofcourse.

MainstreamapplicationsarelocatedinthelayerofApplication,includinge-mail,SMS,calendar,Googlemap,Webbrowserandcontacts.Usersinteractdirectlywiththislayer[1][2].

ThelatestversionofAndroid,Android2.2Froyo,putsonsomenewfeatures.Theyare:

1.SupportFlash10.1,enablesusertowatchflashonthephone.2.V8JavaScriptengineinwebbrowserleadstofasterInternetdatatransportation.3.Bigadvanceinnetworksharing.Youcanusethephoneasa3GNIC,orconvert3GsignaltoWi-Fi.4.Automaticallysoftwareupdate.5.SoftwarescanbesetupinSDcardtoextendfilestorages.

2.2.iPhone

iPhoneOSisconsistof4abstractlayers:

CoreOS,CoreService,MediaandCocoaTouchrespectively.

LayersofCoreOSandCoreServicearedesignedinClanguagetohandlecoresystemservices,enablingdeveloperstoperformfileaccess,socketscallinganddatahandling.CFNetworkandSQLitearealsopartsofthese2layers.

ThelayerofMedia,accordingtoitsname,thislayerisusedtocontrolvideoandaudio,aswellhandle2Dand3Dimages.TheOpenGL-ESQuratzpartofthelaye