说明：  本文档详细阐述了ANDROID操作系统的各个功能模块，包括IPC通讯、GWES框架原理、RIL电话系统、应用程序框架等等，是一份难得的资料！
(This document describes in detail the various features ANDROID operating system modules, including the IPC communication, GWES framework of principles, RIL phone system, application framework, etc., is a valuable information!)