ActivityManagerService架构设计源码分析
[TOC]
AMS即ActivityManagerService承担了Android四大组件的启动、切换、调度以及进程的管理工作，掌握了所有应用的创建、启动、管理，是Android中最核心的服务。
Activity最后通过调用ActivityManagerProxy，然后通过Binder机制同ActivityManagerService通讯，因为两种属于不同的进行（AMS属于系统进程）。
AMS体系化关系图如下图所示：
从Activity跳转到另一个Activity经历了两次跨进程过程：首先从用户端进程调用系统进程，然后系统进程调用用户端进程回到用户端，源码调用时序图如下图所示：
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