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1、沈阳建筑大学毕业论文毕业论文外文及翻译原文题目AndroidApplicationFundamentals学院专业班级信息与控制工程学院计算机08-1学生姓名XXX性别X指导教师XXX职称XXX年月日外文及翻译共21页第21页沈阳建筑大学毕业论文英语原文AndroidApplicationFundamentalsAndroidapplicationsarewrittenintheJavaprogramminglanguage.TheAndroidSDKtoolscompilethecode—alongwithanydataandresource
2、files—intoan Androidpackage,anarchivefilewithan .apk suffix.Allthecodeinasingle .apk fileisconsideredtobeoneapplicationandisthefilethatAndroid-powereddevicesusetoinstalltheapplication.Onceinstalledonadevice,eachAndroidapplicationlivesinitsownsecuritysandbox:lTheAndroidoperat
3、ingsystemisamulti-userLinuxsysteminwhicheachapplicationisadifferentuser.lBydefault,thesystemassignseachapplicationauniqueLinuxuserID(theIDisusedonlybythesystemandisunknowntotheapplication).ThesystemsetspermissionsforallthefilesinanapplicationsothatonlytheuserIDassignedtothat
4、applicationcanaccessthem.lEachprocesshasitsownvirtualmachine(VM),soanapplication'scoderunsinisolationfromotherapplications.lBydefault,everyapplicationrunsinitsownLinuxprocess.Androidstartstheprocesswhenanyoftheapplication'scomponentsneedtobeexecuted,thenshutsdowntheprocesswh
5、enit'snolongerneededorwhenthesystemmustrecovermemoryforotherapplications.Inthisway,theAndroidsystemimplementsthe principleofleastprivilege.Thatis,eachapplication,bydefault,hasaccessonlytothecomponentsthatitrequirestodoitsworkandnomore.Thiscreatesaverysecureenvironmentinwhich
6、anapplicationcannotaccesspartsofthesystemforwhichitisnotgivenpermission.However,therearewaysforanapplicationtosharedatawithotherapplicationsandforanapplicationtoaccesssystemservices:lIt'spossibletoarrangefortwoapplicationstosharethesameLinuxuserID,inwhichcasetheyareabletoacc
7、esseachother'sfiles.Toconservesystemresources,applicationswiththesameuserIDcanalsoarrangetoruninthesameLinuxprocess共21页第21页沈阳建筑大学毕业论文andsharethesameVM(theapplicationsmustalsobesignedwiththesamecertificate).lAnapplicationcanrequestpermissiontoaccessdevicedatasuchastheuser'sco
8、ntacts,SMSmessages,themountablestorage(SDcard),camera,Bluetooth,andmore.All
