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1、Chapter12PersonalInformationManager535P: 10CompCompRef8710-9ch12.vpThursday,February06,20031:37:30PM536J2ME:TheCompleteReferencehemajorreasonforusingapersonaldigitalassistant(PDA)istostore,retrieve,andmanagepersonalinformationsuchasaddresses,telephonenumbers,aTc
2、alendar,andatodolist.NearlyallPDAshavefactory-installedapplicationstomanagethistypeofinformation.AlthoughpersonalinformationismaintainedbyPDAapplications,anyJ2MEapplicationrunningwithinaCLDCbaseimplementationcanaccessthatdatathroughtheuseofthepersonalinformationmana
3、gement(PIM)API.ThePIMAPIcontainsinterfacesandclassesthatgiveyourMIDPapplicationaccesstothePDA’sdatabasesoyoucanreadandmodifydatastoredbyotherapplicationsandinsertyourowninformationintothedatabase,whichcanthenbeaccessedbyotherPDAapplications.Inthischapteryou’lllearnh
4、owtointeractwithdatastoredonthePDA’sdatabasebythePDA’stodolist,calendar,andaddressbookapplication.You’llalsofindamodelPIMapplicationthatcanbemodifiedtomeettheneedsofyourownPIMapplication.PIMDatabasesThePIMusesthreetypesofdatabasestostoreandmanagetheuser’spersonalinf
5、ormation,althoughaplatformmayhavemorethanoneofeachtype.Theseareacontactdatabase,eventdatabase,andtododatabase.Thecontactdatabasecontainsnames,addresses,phonenumbers,andothersimilarinformationaboutpersonalcontactsandfollowstheIETFvCard2.1specification,althoughoptiona
6、lpackagePIMscaninclude3.0.ThevCard2.1standardisadheredtoforimportingandexportingcontactdata.Databasescancontainnon-vCardfields.ThosefieldsaremappedtoextensionsinvCardterminology.YoucannotassumethatdatabasescomplywiththevCard2.1format.Theeventdatabaseandthetododataba
7、secontaincalendar-basedinformationstoresthatcontaintheday,month,year,time,andabriefdescriptionofactivitiesoccurringonaspecifieddate.BothdatabasesadheretothevCalendar1.0standardfromtheInternetMailConsortium.ThevCalendar1.0standardisadheredtoforimportingandexportingev
8、entdata.Databasescancontainnon-vCalendarfields.ThosefieldsaremappedtoextensionsinvCalendarterminology.Youcannotassumethatdatabasescomplywi
