毕业论文5000字英文翻译怎么找啊
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外文及翻译
英语原文AndroidApplicationFundamentals
AndroidapplicationsarewrittenintheJavaprogramming
language.TheAndroidSDKtoolscompilethecode—alongwith
anydataandresourcefiles—intoanAndroidpackage,an
archivefilewithan.apksuffix.Allthecodeina
single.apkfileisconsideredtobeoneapplicationandis
thefilethatAndroid-powereddevicesusetoinstallthe
application.Onceinstalledonadevice,eachAndroid
applicationlivesinitsownsecuritysandbox:?TheAndroid
operatingsystemisamulti-userLinuxsysteminwhicheach
applicationisadifferentuser.
?Bydefault,thesystemassignseachapplicationa
uniqueLinuxuserID(theIDisusedonlybythesystemand
isunknowntotheapplication).Thesystemsets
permissionsforallthefilesinanapplicationsothat
onlytheuserIDassignedtothatapplicationcanaccessthem.
?Eachprocesshasitsownvirtualmachine(VM),soan
applicationscoderunsinisolationfromotherapplications.
?Bydefault,everyapplicationrunsinitsownLinux
process.Androidstartstheprocesswhenanyofthe
applicationscomponentsneedtobeexecuted,thenshutsdown
theprocesswhenitsnolongerneededorwhenthesystem
mustrecover
memoryforotherapplications.
Inthisway,theAndroidsystemimplementstheprinciple
ofleastprivilege.Thatis,eachapplication,bydefault,
hasaccessonlytothecomponentsthatitrequirestodoits
workandnomore.Thiscreatesaverysecureenvironmentin
whichanapplicationcannotaccesspartsofthesystemfor
whichitisnotgivenpermission.
However,therearewaysforanapplicationtosharedata
withotherapplicationsandforanapplicationtoaccess
systemservices:
?Itspossibletoarrangefortwoapplicationstoshare
thesameLinuxuserID,inwhich
casetheyareabletoaccess
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