BREW开发简介.ppt

BREW的介绍 什么是BREW BREW: Binary Runtime Environment for wireless(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，Applications and extensions are discovered at run time E:Environment,BREW provides a wealth of APIs and application management services. W:For wireless .BREW is a fast ,efficient,low RAM/FLASH enviroment,and specifically developed for wireless devices to allow applications to take advantage of wireless servieces BREW结构 BREW结构 1、Device Layer Provides Primitives OS and Deviece Driver Functionality 2、OEM layer Provides services to the AEE layer natively or through the Device Layer ChiL(Chip Interface Layer)Provides Baseband Chip Specific Services(e.g. GPS,Socket) MIL(Mobile Interface Layer) Provides Generic Baseband Chip Independent services(e.g. Database,Heap) 3、AEE layer Provides a uniform API to applications BREW 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：Module information File BAR：BREW Applet Resource File MOD：Binary Module File SIG：Digital Signature File MIF This file type contains information about each Module.Each module can contain One or More BREW applets or Extensions,and this type of file contains information such as: Applet ClassIDs,names,Images,and settings General module information in text Privilege levels Exported ClassIDs and MIME types Module dependencies BAR and MOD file BAR: this file type contains the application resources:text strings,images and dialogs.This file type is used by the MOD files during execution.the BAR files are generated from BREW resource intermediate files(BRI) MOD: This file type is the dynamically loaded module executed at runtime.The applet Source files are compiles and linked into this MOD file type SIG: This file typecontains Digital Signature information to ensure the Integrity of each applet.When a Module is downloaded,this Signature file is verified by validating the binary and resource files BREW Stacking and