《BREW开发简介》PPT课件

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1、BREW的介绍2003年7月什么是BREWBREW:BinaryRuntimeEnvironmentforwireless(二进制运行环境）Brew是一个无线平台，通过COM风格的API提供给上层应用。B：Binary，API是二进制库的集合。应用程序可以被编译和链结到特定的处理器（如ARM）R：Runtime，ApplicationsandextensionsarediscoveredatruntimeE:Environment,BREWprovidesawealthofAPIsandapplicationm

2、anagementservices.W:Forwireless.BREWisafast,efficient,lowRAM/FLASHenviroment,andspecificallydevelopedforwirelessdevicestoallowapplicationstotakeadvantageofwirelessserviecesBREW结构BREW结构1、DeviceLayerProvidesPrimitivesOSandDevieceDriverFunctionality2、OEMlayerPr

3、ovidesservicestotheAEElayernativelyorthroughtheDeviceLayerChiL(ChipInterfaceLayer)ProvidesBasebandChipSpecificServices(e.g.GPS,Socket)MIL(MobileInterfaceLayer)ProvidesGenericBasebandChipIndependentservices(e.g.Database,Heap)3、AEElayerProvidesauniformAPItoapp

4、licationsBREW文件和目录所有的BREW文件和目录名字都是小写字母BREW3.0将允许大小写的文件名四种文件类型MIF：ModuleinformationFileBAR：BREWAppletResourceFileMOD：BinaryModuleFileSIG：DigitalSignatureFileMIFThisfiletypecontainsinformationabouteachModule.EachmodulecancontainOneorMoreBREWappletsorExtensions

5、,andthistypeoffilecontainsinformationsuchas:AppletClassIDs,names,Images,andsettingsGeneralmoduleinformationintextPrivilegelevelsExportedClassIDsandMIMEtypesModuledependenciesBARandMODfileBAR:thisfiletypecontainstheapplicationresources:textstrings,imagesanddi

6、alogs.ThisfiletypeisusedbytheMODfilesduringexecution.theBARfilesaregeneratedfromBREWresourceintermediatefiles(BRI)MOD:Thisfiletypeisthedynamicallyloadedmoduleexecutedatruntime.TheappletSourcefilesarecompilesandlinkedintothisMODfiletypeSIG:Thisfiletypecontain

7、sDigitalSignatureinformationtoensuretheIntegrityofeachapplet.WhenaModuleisdownloaded,thisSignaturefileisverifiedbyvalidatingthebinaryandresourcefilesBREWStackingandManagementBREWappletstackingOnlyoneappletisvisibleatatimeBREWmaintainshistorylistofapplication

8、thathavestartedandsuspendedAllowsmixofOEMUI/MMIandBREWappletsAllowsoneormoreBREWappletstobestartedinsequencesandmixedwithOEMUIdialogsorapplicationsBREWappletscanruninthebackgroundifnodisplayorke