分析和比较开放和封闭的移动平台—安卓和苹果系统-毕业论文外文翻译

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1、AnAnalysisandComparisonofOpenandClosedMobilePlatformsAndroidvs.iPhone1.IntroductionInrecentyears,thepopularityofsmartphonekeptgoingup.Moreandmoresmartphonesaresoldandalotofpeopleareembracingthem.Smartphonesbroughtgreatconveniencetousers，aswellcreatedopportunitiesf

2、orsmartphoneresearchers.That’stosay，thewidespreadofsmartphonesbenefitedbothsides.Atthesametime，developingofsmartphoneOSbecomesoneofthesmartestindustry.TobeasmartphoneOS，thesystemshould:1.ProvideserviceslikeaPC.2.WorkwithaGPUforbettervisualeffects.3.Allowtheusertos

3、urfonInternetfreely.Andapparently，there5realsosomeweaknesses:1.Limitedbattery.2.PoorCPUperformanceagainstPCCPU.3.Smallstorage.4.TheuseofRAMmayleadstolossofdatawhenthephonerunsoutofbatteryNowthe2giantsofsmartphoneOSareAndroidandiPhoneOS.Ononeside，AndroidisbasedonLi

4、nuxkernelandDalvikvirtualmachine，anditisopensourced.TheupperlayerofAndroidisJavabased,allowingdeveloperstodevelopAndroidapplicationswithGoogleSDKandselltheirsoftwareinAndroidMarket.Ontheotherside,iPhoneOS,whichbasesonUnixkernelandDarwinmodelbutisclosedsourced，evol

5、vesfromMacOSXandisthedefaultOSofiPhone，iPodTouchandiPad.ObjectiveCbasedsoftwarecanruniniPhoneOS，andjustlikeAndroid，youcandevelopyourowniPhoneapplicationsanduploadthemontoApple’s4AppStore’forsale.BycomparingthelatestAndroidandiPhoneOS，Android2.2FroyoandiOS4,wecanta

6、keaglimpseatthemainfeatureofopenandclosedsmartphoneOSs.Whilethe2OSsaredesignedinratherdifferentmentalityandfunctionality，it’salittleearlytotellwhichoneisbetter.1.SmartPhoneOS1.1.AndroidThesystemarchitectureofAndroidconsistsof5layers,whichareLinuxKernel,AndroidRunt

7、ime，Libraries，ApplicationFrameworkandApplications，frombottomtotop.Androidprovidescoreserviceslikesecurity，memorymanagement，processmanagement，networkstackanddrivers，basingonLinux2.6.Beingtheabstractlayerbetweensoftwareandhardware,thelayerofLinuxKernelhidestheimplem

8、entingdetailsofhardwareandprovidesintegratedservicesforupperlayer.DalvikvirtualmachineandJavacorelibrariesareincludedinthelayerofAndroidRuntime,providin