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1、毕业设计（论文）外文翻译毕业论文题目基于Android手机通讯录的设计与实现作者姓名所学专业名称计算机科学与技术学号指导教师2012年6月10日11AndroidDevelopersAndroidapplicationsarewrittenintheJavaprogramminglanguage.ThecompiledJavacode—alongwithanydataandresourcefilesrequiredbytheapplication—isbundledbytheaapttoolintoanAndroi
2、dpackage,anarchivefilemarkedbyan.apksuffix.Thisfileisthevehiclefordistributingtheapplicationandinstallingitonmobiledevices;it'sthefileusersdownloadtotheirdevices.Allthecodeinasingle.apkfileisconsideredtobeoneapplication.Inmanyways,eachAndroidapplicationlivesin
3、itsownworld:1.Bydefault,everyapplicationrunsinitsownLinuxprocess.Androidstartstheprocesswhenanyoftheapplication'scodeneedstobeexecuted,andshutsdowntheprocesswhenit'snolongerneededandsystemresourcesarerequiredbyotherapplications.2.Eachprocesshasitsownvirtualmac
4、hine(VM),soapplicationcoderunsinisolationfromthecodeofallotherapplications.3.Bydefault,eachapplicationisassignedauniqueLinuxuserID.Permissionsaresetsothattheapplication'sfilesarevisibleonlytothatuserandonlytotheapplicationitself—althoughtherearewaystoexportthe
5、mtootherapplicationsaswell.1ApplicationComponentsAcentralfeatureofAndroidisthatoneapplicationcanmakeuseofelementsofotherapplications(providedthoseapplicationspermitit.Forexample,ifyourapplicationneedstodisplayascrollinglistofimagesandanotherapplicationhasdevel
6、opedasuitablescrollerandmadeitavailabletoothers,youcancalluponthatscrollertodothework,ratherthandevelopyourown.Yourapplicationdoesn'tincorporatethecodeoftheotherapplicationorlinktoit.Rather,itsimplystartsupthatpieceoftheotherapplicationwhentheneedarises.Forthi
7、stowork,thesystemmustbeabletostartanapplicationprocesswhenanypartofitisneeded,andinstantiatetheJavaobjectsforthatpart.Therefore,unlikeapplicationsonmostothersystems,Androidapplicationsdon'thaveasingleentrypointforeverythingintheapplication(nomain()function,for
8、example).Rather,theyhaveessentialcomponentsthatthesystemcaninstantiateandrunasneeded.Therearefourtypesofcomponents:1.1ActivitiesAnactivitypresentsavisualuserinterfaceforonefocusede
