Android13.0的activity启动流程

基于 Android 13.0 相关源码：

frameworks/base/services/core/java/com/android/server/wm/
ActivityTaskManagerService.java
ActivityStarter.java
RootWindowContainer.java
Task.java
TaskFragment.java
ActivityTaskSupervisor.java


frameworks/base/core/java/android/app/
Activity.java
Instrumentation.java
IActivityTaskManager.java 
IActivityTaskManager.aidl
IApplicationThread.aidl
ApplicationThread.java
ClientTransactionHandler.java
ActivityThread.java
UiTranslationController.java

activity启动流程调用流向：

Activity.java
startActivity  ->  startActivityForResult
Instrumentation.java
->  execStartActivity  
IActivityTaskManager.java IActivityTaskManager.aidl
->  IActivityTaskManager.Stub.asInterface(  ServiceManager.getService(Context.ACTIVITY_TASK_SERVICE)) . startActivity
.
.
.  （old_app_process通过AIDL-> binder跨进程调用到system_process）
.
.
ActivityTaskManagerService.java (extends IActivityTaskManager.Stub)
startActivity  ->  startActivityAsUser  ->  getActivityStartController().obtainStarter(intent, "startActivityAsUser").execute(); 
【此处obtainStarter是从ActivityStarter的成员变量异步池中获取activitystater，此池子容量为3（刚刚，现在，即将），获取后为其赋值此次启动的关键参数,都放在成员变量mRequest中，Request是静态内部类】
ActivityStarter.java
execute  
【如果 mRequest.activityInfo == null 那么 mRequest.resolveActivity(mSupervisor)进行解析;;如果action是关机或者重启，则通过ShutdownCheckPoints记录是谁干的】
【此处的 resolveActivity 函数内会创建新的intent以避免对客户端传来的intent对象修改，
并通过 supervisor.resolveIntent(intent... 对成员变量resolveInfo赋值（这里可以为特殊应用添加独特的resolve方法赋值resolveInfo，来跳转到特定应用如weixin、chooseActivity等）
  通过 supervisor.resolveActivity(intent... 对成员变量activityInfo赋值】
->  executeRequest  ->  startActivityUnchecked  ->  startActivityInner  ->  resumeFocusedTasksTopActivities
RootWindowContainer.java
->   resumeFocusedTasksTopActivities  ->  resumeTopActivityUncheckedLocked
Task.java
->  resumeTopActivityUncheckedLocked
TaskFragment.java
->  resumeTopActivity
ActivityTaskSupervisor.java
->  startSpecificActivity  ->  realStartActivityLocked
IApplicationThread.aidl
->  scheduleTransaction
.
.
.  （system_process通过AIDL-> binder跨进程调用到new_app_process）
.
.
private class ApplicationThread (extends IApplicationThread.Stub) in ActivityThread.java
->  scheduleTransaction
(ActivityThread extends) ClientTransactionHandler.java
->  scheduleTransaction
ActivityThread.java
sendMessage(H.UPDATE_UI_TRANSLATION_STATE, args)
H (in ActivityThread)
匹配case处理 ：
Activity.java
updateUiTranslationState
UiTranslationController.java
updateUiTranslationState （ 这里做具体的Update the Ui translation state. 并打印log onAutoTranslationStateChange(): unknown state:） 

☝

package android.app;   ---frameworks/base/core/java/android/app/

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package com.android.server.wm;   ---frameworks/base/services/core/java/com/android/server/wm/