外文原文AndroidApplicationFundamentals —alongwithanydataandresourcefiles—intoan Androidpackage,anarchivefilewithan .apk .apk fileisconsideredtobeoneapplicationandisthefilethatAndroid-powereddevicesusetoinstalltheapplication. Onceinstalledonadevice,eachAndroidapplicationlivesinitsownsecuritysandbox:TheAndroidoperatingsystemisamulti-,thesystemassignseachapplicationauniqueLinuxuserID(theIDisusedonlybythesystemandisunknowntotheapplication).(VM),soanapplication','scomponentsneedtobeexecuted,thenshutsdowntheprocesswhenit',theAndroidsystemimplementsthe ,eachapplication,bydefault,. However,esssystemservices:It'spossibletoarrangefortwoapplicationstosharethesameLinuxuserID,esseachother',applicationswiththesameuserIDcanalsoarrangetoruninthesameLinuxprocessandsharethesameVM(theapplicationsmustalsobesignedwiththesamecertificate).essdevicedatasuchastheuser'scontacts,SMSmessages,themountablestorage(SDcard),camera,Bluetooth,:1、、、
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