android系统从systemserver开始的launcher启动详细流程讲诉.docx

android系统启动流程——从systemserver开始的launcher目录1 概述:22 systemserver工作内容分析32.1 SystemServer类简述42.2 ServerThread类简述43 ActivityManagerService工作内容分析63.1 ActivityManagerService之main73.1.1创建ActivityManagerService实例73.1.2 创建ActivityThread实例，获取全局Context83.1.3创建ActivityStackSupervisor实例103.1.4调用startRunning103.2 ActivityManagerService之setSystemProcess113.3. ActivityManagerService之setWindowManager123.4 ActivityManagerService之systemready123.4.1 启动所有Persistent属性的APK133.4.2 启动launcher144 ActivityStackSupervisor启动launcher154.1首先回顾一下ActivityStackSupervisor实例的初始化154.2 进入ActivityStackSupervisor.resumeTopActivitiesLocked164.3 进入ActivityStack.resumeTopActivityLocked164.4 回到ActivityStackSupervisor.resumeHomeActivity。174.5 ActivityStackSupervisor.mProbeThread174.6 ActivityStackSupervisor.mProbeHandler184.7 回到ActivityManagerService.startHomeActivityLocked184.8 ActivityStackSupervisor.startHomeActivity194.9 ActivityStackSupervisor.startActivityUncheckedLocked204.10 ActivityStack.startActivityLocked214.11 ActivityStackSupervisor.resumeTopActivitiesLocked224.12 ActivityStack.resumeTopActivityLocked224.13 ActivityStackSupervisor.startSpecificActivityLocked244.14 ActivityStackSupervisor.realStartActivityLocked244.15 ActivityManagerService.startProcessLocked255 Process类管理创建activity进程275.1 Process.start:275.2Process.startViaZygote285.3 zygoteSendArgsAndGetResult和 openZygoteSocketIfNeeded286 ActivityThread线程类分析306.1 ActivityThread.main分析306.1.1创建了looper对象和本线程绑定。306.1.2创建了ActivityThread对象实例306.1.3进行attach回调316.1.4 ActivityStackSupervisor.attachApplicationLocked346.1.5 ActivityStackSupervisor. ensureActivitiesVisibleLocked346.2 ApplicationThread内部类346.2.1 ActivityThread.ApplicationThread. scheduleLaunchActivity356.2.2 ActivityThread.ApplicationThread.scheduleResumeActivity376.2.3 发出开机完成通知387 总结407.1 luancher启动流程总结407.2luancher黑屏问题分析411 概述: android系统启动到zygote后，系统就真正进入java世界了；而zygote启动的第一个进程是systemserver.而用户看到的第一个程序是launcher.本文要分析的正是从systemserver道launcher的启动流程.分析过程涉及到PowerManagerService,ActivityManage