分析和比较开放和封闭的移动平台外文翻译毕-业论文-毕业论文

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1、河南科技学院2015届本科毕业设计外文资料及翻译AnAnalysisandComparisonofOpenandClosedMobile1.IntroductionInrecentyears,thepopularityofsmartphonekeptgoingup.Moreandmoresmartphonesaresoldandalotofpeopleareembracingthem.Smartphonesbroughtgreatconveniencetousers,aswellcreatedopportunitiesforsmartphoneresearchers.Thatstosay,th

2、ewidespreadofsmartphonesbenefitedbothsides.Atthesametime,developingofsmartphoneOSbecomesoneofthesmartestindustry.TobeasmartphoneOS,thesystemshould:1.ProvideserviceslikeaPC.2.WorkwithaGPUforbettervisualeffects.3.AllowtheusertosurfonInternetfreely.Andapparently,thererealsosomeweaknesses:1.Limitedbatte

3、ry.2.PoorCPUperformanceagainstPCCPU.3.Smallstorage.4.TheuseofRAMmayleadstolossofdatawhenthephonerunsoutofbatteryNowthe2giantsofsmartphoneOSareAndroidandiPhoneOS.Ononeside,AndroidisbasedonLinuxkernelandDalvikvirtualmachine,anditisopensourced.TheupperlayerofAndroidisJavabased,allowingdeveloperstodevel

4、opAndroidapplicationswithGoogleSDKandselltheirsoftwareinAndroidMarket.Ontheotherside,iPhoneOS,whichbasesonUnixkernelandDarwinmodelbutisclosedsourced,evolvesfromMacOSXandisthedefaultOSofiPhone,iPodTouchandiPad.ObjectiveCbasedsoftwarecanruniniPhoneOS,andjustlikeAndroid,youcandevelopyourowniPhoneapplic

5、ationsanduploadthemontoApplesAppStoreforsale1234.BycomparingthelatestAndroidandiPhoneOS,Android2.2FroyoandiOS4,wecantakeaglimpseatthemainfeatureofopenandclosedsmartphoneOSs.Whilethe2OSsaredesignedinratherdifferentmentalityandfunctionality,itsalittleearlytotellwhichoneisbetter.2.SmartPhoneOS2.1.Andro

6、idThesystemarchitectureofAndroidconsistsof5layers,whichareLinuxKernel,AndroidRuntime,Libraries,ApplicationFrameworkandApplications,frombottomtotop.Androidprovidescoreserviceslikesecurity,memorymanagement,processmanagement,networkstackanddrivers,basingonLinux2.6.Beingtheabstractlayerbetweensoftwarean

7、dhardware,thelayerofLinuxKernelhidestheimplementingdetailsofhardwareandprovidesintegratedservicesforupperlayer.DalvikvirtualmachineandJavacorelibrariesareincludedinthelayerofAndroidRuntime,providingmostfunctionsinJavacorelibraries.ThelayerofLibrariescontainsaclassofC/C+librariesforAndroidcomponents.

8、ThoselibrariesareintegratedbythelayerofApplicationFrameworkandthenprovidedtodevelopers.ThelayerofApplicationFrameworkprovidesallkindsofmodulesforprograminitializationtosimplifytheuseofcomponents,allowingdevelopersdowhatevertheywantandprovideservicesforothersoftwares,underthelimitationofsecurity,ofco

9、urse.MainstreamapplicationsarelocatedinthelayerofApplication,includinge-mail,SMS,calendar,Googlemap,Webbrowserandcontacts.Usersinteractdirectlywiththislayer12.ThelatestversionofAndroid,Android2.2Froyo,putsonsomenewfeatures.Theyare:1.SupportFlash10.1,enablesusertowatchflashonthephone.2.V8JavaScripten

10、gineinwebbrowserleadstofasterInternetdatatransportation.3.Bigadvanceinnetworksharing.Youcanusethephoneasa3GNIC,orconvert3GsignaltoWi-Fi.4.Automaticallysoftwareupdate.5.SoftwarescanbesetupinSDcardtoextendfilestorages.2.2.iPhoneiPhoneOSisconsistof4abstractlayers:CoreOS,CoreService,MediaandCocoaTouchre

11、spectively.LayersofCoreOSandCoreServicearedesignedinClanguagetohandlecoresystemservices,enablingdeveloperstoperformfileaccess,socketscallinganddatahandling.CFNetworkandSQLitearealsopartsofthese2layers.ThelayerofMedia,accordingtoitsname,thislayerisusedtocontrolvideoandaudio,aswellhandle2Dand3Dimages.

12、TheOpenGL-ESQuratzpartofthelayeriscodedwithClanguage,whilethepartofCore-AudioandCore-AnimationisObjectiveCbased.ThelayerofCocoaTouchbuildsabasicframeworkforallkindsofprogramsiniPhone.MostprogramsruninCocoaTouchlayer,anditssurelyObjectiveCbased34.ThelatestiPhoneOSisiOS4.Itincludesthefollowingnewfeatu

13、res:1.Softwareclassification.Thisfeatureenablesusertoplacesortedsoftwaresintodifferentdocuments,makingitclearertomanage.2.Emailintegration.Oneaccountisforalle-mailsfromdifferentproviders.3.iBook,originallyfromiPad,isbuiltiniOS.4.AbrandnewAppleGameCentermakesiPhoneatremendousentertainmentplatform.2.3

14、.Androidvs.iPhoneBeingthetop2smartphoneOSs,weresurethatbothAndroidandiPhonehavetheirownadvantagesanddisadvantages.Nowletstakealookateachofthem,andseewhatuniquefeaturetheyhave.Android2.2Froyofullysupportmultitask,whichmeansyoucanlistentomusicwhilewritingblog.AndiOS4,officiallyannouncedtobemultitasked

15、,isinfactaplayofconcept.OnlyafewofsoftwareswhichareauthorizedbyApplecanrunsimultaneously,whoseprincipleismucheasierthatmultitask:whenanapplicationisswitchedout,itscurrentstateissavedandthenthesystemjustclosesit.Andwhenitsswitchedin,werebacktotheprevioussnapshot567.DuringthepublicationofAndroid2.2Fro

16、yo,Googleannouncedithasthemostfluentwebbrowser,becausetheuseofV8JavaScriptengine.V8isabrandnewengine,designedforrunningbigsizeJavaScriptapplication.Insomekindoftests,V8ismuchfasterthanJScriptfromInternetExplorer,SpiderMonkeyfromFirefoxandJavaScriptCorefromSafari.Italloweto3keypartsofV8,theyrefastatt

17、ributeaccess,dynamiccodegeneration,effectivetrashcleaning.2.3.1.FastAttributeAccessJavaScriptisakindofdynamiclanguage,whichmeansattributescanbeaddedordeletedatruntime,andtheyrefrequentlychanged.MostJavaScriptenginesuseadictionarystylestructuretostoretheattributesofanobject,soitrequiresawholedictiona

18、rysearchtofindthepositionofattributesinmemory.ItsquiteinefficientanditsslowerthanJavaandSmalltalk.Tosolvethisproblem,V8discardeddynamicsearchandrealizeditinadifferentway:Createhiddenclassesforobjectsdynamically.InJavaScript,everytimewhenwereaddinganewattributetoanobject,wecreateasubclasswiththenewat

19、tributefromahiddenclassasthesuperclass.Itsarecursivecourseandtheaboveperformancehappensonlyoncewhenwefirstdothis.Laterwejustusetheprevioushiddensubclasswhenwereinthesamesituation.Sotheresnoneedtorepeatoperationandcreateadictionary.Thisleadstothesaveoftimeandenergy,aswellmakeiteasierfortheimplementat

20、ionofclassoptimizationandinnercache4.2.3.2.DynamicCodeGenerationWhenJavaScriptisrunningfortheveryfirsttime,V8translateitdirectlyintolocalmachinecode,ratherthanexplainittobytecode.Attributeaccessisdonebyinnercache,whichisoftentranslatedintoinstructionsbyV8atruntime.Whenitcomestothecodewherecertainobj

21、ectisaccessed,V8triestofindthecurrenthiddenclass.Meanwhile,V8assumesthatallobjectsinthesnippetaredescribedbythesamehiddenclass,soV8willmodifycorrespondinginnercachetomakethedirectuseofthehiddenclassmoreconvenient.Ifthisassumptioniscorrect,theaccessofattributescanbealldoneinonly1instruction.Evenifthe

22、predictionfails,innercacheismodifiedagainbyV8,whichwonttaketoomuchtimeandresource.Whenonehiddenclassissharedbyalotofobjects,theaccessspeedcanbeclosetomostdynamiclanguageaccessspeed.Innercacheandhiddenclass,mixedwithdynamiccodeandclassoptimization,improvetheefficiencyofJavaScriptatalargescale4.2.3.3.

23、EffectiveTrashCleaningV8doesmemoryrecyclesautomatically.Toguaranteethespeedofobjectdistribution,aswellcutthetimeoftrashcleaningandclearfragmentup,V8willinterrupttherunningapplicationwhenperformingtrashcleaning.Mostly,onlyasmallpartofobjectstackisinvolvedintrashcleaningcycle,sotheinterruptioncausedli

24、ttle.AlllocationofobjectsandpointersareloggedbyV8,sothesystemwonttakeobjectforpointerandmemoryoverflowisavoided4.Besidesthemostfluentwebbrowser,GooglecollaboratedwithAdobeandAndroid2.2FroyofullysupportsFlash.Thatstosay,notonlyflashmedia,butallflashwebpagescandisplayperfectlyonAndroid.Tothecontrary,A

25、ppleturneddownAdobeandtakeHTML5asiPhoneswebprotocol,makingitunabletoshowsomeflashbasedanimation.Android2.2Froyoalsoleadsthewayinnetworksharing.SmartphonewithFroyocanbeconnectedtoaPCasa3GNIC,andcanalsoconvenientlyconvert3GsignaltoWi-Fi.iOS4candothefirsttoo,butfailedtoconvert3GtoWi-Fi.Videoconferencei

26、sbothsupportedbyFroyoandiOS4,buttheconditionsaredifferent.YoucanseeaFroyouserviacameraaslongasyougetacameraalso.However,iOS4usercanonlydovideotalktoanotheriOS4user,whichisabiglimitation.WhileAndroidisascendantinnetworkinteraction,Appleisuniqueinitsfriendshipandentertainment.Theaddedfeatureofsoftware

27、classificationenablesusertoplacesortedsoftwaresintodifferentdocuments,makingitclearertomanage.Whatsmore,thererehundredsofthousandsapplicationsinAppStore,meaningthatiPhonecanhaveuptohundredsofthousandsfunctions.ThisisaratherremarkablefeaturethatApplepublicizes.AndthemostconvincingpointgivenbyApple,is

28、thatAndroidlooksexactlyfamiliarwithiPhone.Althoughitsjustasubjectivesense,thebornofiPhonereallybroughtbigrevolutiontothephoneindustry,andthenameAppleitselfisaworldfamousbrand78.3.OpenandClosedplatforms3.1.SDKThemostimportantpartofeverydevelopingplatformisSDK,enable3rdpartydeveloperstomakesoftwarefor

29、theplatform.Usually,libraries,debugtoolsandemulatorsareincludedinSDK.DifferentplatformsdistributetheirSDKsdifferently.SomeSDKiscompletefreeandopen,whileothersarestrictlylimited.Developersofopenplatformscangetandmodifypartorallofthesourcecode.GoogleandLinuxareleadersofopenplatforms;theypublicizedthew

30、holesourcecodeofAndroidandLinux.Thegoodpointisthat,platformownerscansaveagreatamountoftimeandenergydevelopingandmaintainingtheplatform,because3rdpartydeveloperswilldothisforthem.Withlessmoneyspentondevelopmentandmaintenance,arelativelylowpricecanattractmoreandmorephoneusers.Contrarily,closedplatform

31、slocktheirsourcecodeinthesafetyandforbid3rdpartyaccesses.AppleandMicrosoftaretherepresentativesofthem,theyarebothclosedsourced,butsomedifferencesdoexists.3rdpartyiPhoneapplicationsarerestrictedwithinnarrowlimits,forthatApplewilllookthrougheveryapplicationwhichisuploadedontoAppStore,andalotofapplicat

32、ionsareturneddown.MicrosoftdontcheckWindowsapplicationsatall,italldependsontheusersthemselves.Youinstalledthemareware,yousuffertheloss.3.2.ApplicationMarketMarketisthemediumbetweendevelopersandusers,henceitsveryimportant.Somepredictedthattherewillbemoreandmoreapplicationmarketswhilesomedontthinkso.I

33、ncurrentmarkets,bothdoexist.Somespecifyonlyonemarketfortheirproducts,whileothersselltheirsoftwaresinvariousmarkets.SoftwaresfromNokia,MicrosoftandLinuxMobilearesoldineverymarket.Developersoftheseplatformscanreleasetheirownapplicationinwhatevermarkets,somarketshavetocompetewitheachotherforaliving.Thi

34、sisgoodforusers.However,thelackofuniversalmanagementmayleadtomessandchaos,softwaresthathavethesamefunctionalityexistindifferentmarkets,whichconfusesusersalot.Correspondingly,solemarketsclaimthatmostapplicationsshouldbesoldinthem.Thiskindofmonopolizationleadstonocompetitor.AppStoreandAndroidMarketare

35、deputyofsolemarkets.Normally,iPhoneapplicationscanonlybefoundinAppStore,andApplewillcheckeveryoneofthembyitself.GoodnewsisthateveryapplicationinAppStoreisofficiallytested,itssafe;Badnewsisthatalotofprettygoodsoftwaresarerejectedforvariousreasons.Andabigunofficialmechanismisbuiltbyhackers,thatisjailb

36、reakandSIMunlock.JailbreakisaprocessthatallowsiPad,iPhoneandiPodTouchuserstogainrootaccessandunlocktheoperatingsystemthusremovinganylimitationsimposeduponthembyApple.Oncejailbroken,iPhoneusersareabletodownloadmanyextensionsandthemespreviouslyunavailablethroughtheAppStoreviainstallerssuchasCydia.Ajai

37、lbrokeniPad,iPhoneoriPodTouchisstillabletousetheAppStoreandiTunes9.AndaSIMlockisacapabilitybuiltintoGSMphonesbymobilephonemanufacturers.Networkprovidersusethiscapabilitytorestricttheuseofthesephonestospecificcountriesandnetworkproviders.Generally,phonescanbelockedtoacceptonlySIMcardsbasedontheIntern

38、ationalMobileSubscriberIdentity.SIMunlockmakeitpossibletouseamobilephonewithoutconsideringcountriesandnetworksspecifiedbymobilephonemanufacturers.HoweverinAndroid,Googledoesnttesteveryapplicationatall,soalthoughtheresanofficialmarketforAndroidapplications,youcanstillreleaseyourproductanywhereyouwant

39、.Consideringsecurityproblems,Googlebannedtheuseofsomecomponents.LikejailbreakandSIMunlockiniPhone,rootinAndroidgivesusers100%controloftheirdevices,alongwithsomesecurityrisks.RootisaprocessthatallowsusersofcellphonesrunningtheAndroidoperatingsystemtoattainprivilegedcontrol(knownasrootaccess)withinAnd

40、roidsLinuxsubsystem,similartojailbreakingonAppledevicesrunningtheiOSoperatingsystem,overcominglimitationsthatthecarriersandmanufacturersputonsuchphones.RootingmakesitpossibletousecustomversionsoftheAndroidsystemsuchasCyanogenMod,supportingfeaturesunavailableinstockROMs.Italsoallowsfornewerversionsof

41、Androidnotsuppliedbytheoriginaldevicemanufacturer.IncontrasttoiOSjailbreaking,rootingisnotneededtorunapplicationsnotdistributedbytheofficialAndroidMarket.Itisneededhowever,whentryingtoaccesspaidAndroidapplicationsfromcountrieswhicharenotpartofthepaidapplicationsmarket.3.3.IntegrationSomecompaniesfoc

42、usonlyontheircoreindustry,i.e.developanoperatingsystemandprovideanenvironmentfor3rdpartydevelopment.Othersnotonlydothese,butmanagetheprocessofdevelopingasoftwaretopublicizingit.Dependingontheintegrationofplatforms,wesortthemto4kinds:fullintegrationplatform,marketintegrationplatform,deviceintegration

43、platformandnointegrationplatform.Thepublicizingmodeloffullintegrationplatformisverystrict.Itsmanagementrangesfromdevicemanufacturingtoapplicationrelease,whoserepresentativeisApple.ApplesfactoryproducesiPhone,ApplesAppStoresellsapplication,ApplesiTunesisthechannelofApplesresources.Thewholeprocessisun

44、derApplescontrol.Marketintegrationplatformscommitthemselvestodevelopingandsellingsoftwares.Googleisoneofthem.Unlikeapple,Googledonthaveafactorytomanufactureitsownhandsets,butonlydevelopedAndroidandsetupAndroidMarketforAndroidapplications.However,companieslikeGoogledefinitelyhavethecapabilitytoproduc

45、eitsowndevices.GoogleisingoodrelationshipwithHTC,whoistheOEMofT-Mobile,O2andOrange,etc.Deviceintegrationplatformsproducetheirownhandsets,butdontsetupapplicationmarkets.Forexample,RIMmakesBlackberry,buttheresnoofficialapplicationmarketforBlackberry.Nointegrationplatformsdofewthings.Microsoftneitherma

46、kesmobilephones,norsetsupamarket.Whattheydoisonlydevelopingtheoperatingsystem:WindowsPhone7.分析和比较开放和封闭的移动平台1介绍近年来，智能手机的普及率不断攀升。越来越多的智能手机被卖出和很多人都更加青睐于它们。智能手机给用户带来了极大方便，并为智能手机研究者创建了机会。这就是说，智能手机的广泛普及，对双方都有利双方。同时，智能手机操作系统发展成为最智能的行业之一。要成为一个智能手机操作系统，该系统应：1.提供服务PC式的服务。2.使用GPU得到更绚丽的视觉效果。3.允许用户在互联网上自由地冲浪。显然，

47、它们也有一些弱点：1，电池的限制。2。较电脑CPU来说，手机CPU性能差。3.存储空间小。4.在手机电池耗尽时，RAM的使用可能会导致数据丢失。现在智能手机操作系统的两巨头是Android和iPhoneOS。一方面，Android是基于Linux内核，Dalvik虚拟机，它是开源的。上层的Android是基于Java的，允许开发者使用谷歌SDK开发Android应用程序和在Android市场销售他们的软件。另一方面，iPhone操作系统基于Unix内核和达尔文模型，但它是封源的，是从MacOSX继承而来，是iPhone，iPodTouch和iPad默认的操作系统。基于C语言的软件可以在iPho

48、neOS上运行，就像Android，你可以开发自己的iPhone应用程序，并上传到苹果的AppStore进行销售。通过比较Android和iPhoneOS的最新系统：Android2.2Froyo和iOS4，我们可以了解下开放式和封闭式的智能手机操作系统的主要特点。虽然两个操作系统的整体思路和功能设计有很大的不同，它初略分辨出哪一个更好一点。2智能手机2.1AndroidAndroid系统的体系结构由5层，从底部到顶部分别是Linux内核，Android运行库，应用框架和应用程序。Android提供的核心服务，如安全，内存管理，进程管理，网络堆栈和驱动器，是基于Linux2.6的。作为软件和硬

49、件层之间的抽象层，Linux内核隐藏硬件执行的细节，并为上层提供综合服务。Dalvik虚拟机和Java核心库都包含在Android运行层，提供Java核心库的大多数功能。这些库包含了应用于Android组件的一系列C/C+库。这些库集成了应用框架层，然后提供给开发人员。应用程序框架层为程序的初始化提供了各种模块，以简化元件的使用，让开发商为所欲为，并提供其他服务软件，当然，在安全性上有所限制。主流应用程序位于应用层，包括电子邮件，短信，日历，谷歌地图，网页浏览器和接触。用户可以直接与此层交互。Android的最新版本的Android2.2Froyo，提出一些新的特点。它们是：1.支持10.1版

50、本的Flash，使用户可以在手机上观看Flash。2.网页浏览器中的V8JavaScript引擎使得互联网数据传输更加迅速。3.在网络共享上有大的进步。你可以将手机作为3G网卡或将3G信号转换为Wi-Fi信号。4.支持自动软件更新。5.软件可安装到SD卡以扩展储存空间。2.2iPhoneiPhoneOS是由4个抽象层组成：核心OS，核心服务，媒体和CocoaTouch。核心操作系统和核心服务层使用C语言设计，来处理核心系统服务，使开发人员能够执行文件访问，socket请求和数据处理。CFNetwork和SQLite同样是这2层一部分。媒体层，根据其名称，是用来控制视频和音频，以及处理二维和三维

51、图像。这一层中的OpenGL-ESQuratz部分是用C语言编码，而音频核心和动画核心的一部分则是基于ObjectiveC编写。CocoaTouch层，在iPhone上为应用程序建立了一个基本框架。大多数程序运行在CocoaTouch层，它也是基于ObjectiveC编写。最新的iPhone操作系统是iOS4。它包括以下新的特点：1.软件分类。这功能可以使用户将不同分类的软件放入不同的文件中，使它更便于管理。2。电子邮件整合。一个账户可以使用不同供应商的电子邮件服务。3。iBook，源于iPad的软件，将内置于iOS。4。一个全新的苹果游戏中心，使iPhone成为一个巨大的娱乐平台。2.3An

52、droidvs.iPhone作为智能手机操作系统中最顶尖的两个，我们相信，Android和iPhone都各有自己的优势和缺点。现在，让我们一起来看看这两个系统，看到它们有什么独特的功能。Android2.2Froyo完全支持多任务，这意味着你可以一边听音乐，写博客。而iOS4，正式宣布其为“多任务运行”，而事实上，这只是一个概念手法的运用。只有少数被苹果授权的软件可以同时运行，多任务原则更是容易得多，当一个应用程序转出时，其当前状态被保存好，然后系统关闭它。当它又被转换进来时，我们又回到了其以前的快照。在Android2.2Froyo公布时，谷歌宣称其拥有最流畅的网络浏览器，因为使用的V8Ja

53、vaScript引擎。V8是一个全新的引擎，为运行庞大的JavaScript应用程序而设计。在一些测试中，V8的速度要比InternetExplorer的JScript，火狐的SpiderMonkey和Safari的JavaScriptCore更加迅速。这一切都归功于V8的3个关键部件，他们可以快速访问属性，动态生成代码，有效进行垃圾的清理。2.3.1快速属性访问JavaScript是一种动态语言，这意味着属性可以在运行时进行添加或删除，并且它们会经常改变。大多数JavaScript引擎使用一种字典式结构来存储对象的属性，因此它需要全局搜索以在内存中找到的属性的位置.It相当低效的属性的位置。

54、这是相当低效的且比Java和Smalltalk慢。为了解决这个问题，V8废弃了动态搜索，并以不同的方式实现：动态的创建对象的隐藏类。在JavaScript中，每次当我们为对象加入一个新的属性，我们会从隐藏类中创建带有新的属性的子类作为超类。这是一个递归过程，且上述过程只有当我们第一次做时出现。然后，当在相同的情况下，我们只是使用以前的隐藏的子类。因此，没有必要重复操作，并创建一个字典。这会保存时间和精力，以及更容易执行类的优化和内部缓存。2.3.2动态代码生成当JavaScript每次首回运行时，V8将把它直接转换为本地机器代码，而不是解释为字节码。属性的访问是通过内部缓存，它通常在运行时被翻

55、译成V8的指令。当它来访问某些对象的代码时，V8引擎试图找到当前的隐藏类。同时，V8假设在代码中的所有对象都是相同的隐藏类，所以V8将修改相应的内部缓存，使隐藏类更方便地直接使用。如果这假设是正确的，属性的访问可以使用1个指令就全部完成。即使预测失败，V8会再次修改内部缓存，这不会花费太多的时间和资源。当一个隐藏类是被很多的对象共享，存取速度可以接近最具活力的语言的访问速度。内部缓存和隐藏类，混合动态代码和类优化，在大规模地改善JavaScript效率。2.3.3有效的垃圾清理机制V8引擎会对内存进行自动回收。为了保证对象的分配速度，以及削减垃圾清理和内存碎片清理的时间，在执行垃圾清理时，V8

56、会中断正在运行的应用程序。大多数情况下只有一小部分对象的堆栈参与垃圾清洁周期，所以中断造成小。所有的对象和指针的位置都会被V8记录，这样系统将不会采取对象的指针和内存溢出将会避免。除了“最流畅的网络浏览器”，谷歌与Adobe进行了合作，Android2.2Froyo充分支持Flash。这就是说，不仅Flash播放器，但所有Flash网页都可以在Android系统上完美显示。与此相反，苹果拒绝Adobe和HTML5作为iPhone的网络协议，导致其无法显示一些基于Flash的动画。Android2.2Froyo在网络共享的方式上取得了领先。搭载Froyo系统的智能手机可以作为PC的3G网卡，还可以方便地将3G信号转换为WIFI信号。iOS4也可以做到第一点，但是不能进行3G和WIFI的转换。Froyo和iOS4都支持视频会议，但条件是不同的。只要你拥有一个摄像头，你就可以通过它看到使用摄像