其实所谓的AMS,PMS,以及WMS等都是运行在system_server这个进程中的线程.
packageManagerService、activityManagerService == activityManagerNative
ActivityManagerService提供的主要功能:
(1)统一调度各应用程序的Activity
(2)内存管理
(3)进程管理
PMS用来管理所有的package信息,包括安装、卸载、更新以及解析AndroidManifest.xml以组织相应的数据结构,这些数据结构将会被PMS、ActivityMangerService等等service和application使用到。
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