主体流程
基于api26
App端：
Activity#startActivity(Intent intent) Activity#startActivity(Intent intent, @Nullable Bundle options) Activity#startActivityForResult(Intent intent, int requestCode) Activity#startActivityForResult(Intent intent, int requestCod, Bundle options) Instrumentation.ActivityResult#execStartActivity ActivityManagerService#startActivity(IApplicationThread caller, String callingPackage...)
AMS端： ActivityManagerService#startActivityAsUser ActivityStarter#startActivityMayWait ActivityStarter#startActivityLocked ActivityStarter#startActivity(IApplicationThread caller, Intent intent, Intent ephemeralIntent,...) ActivityStarter#startActivity(final ActivityRecord r, ActivityRecord sourceRecord,...) ActivityStarter#startActivityUnchecked ActivityStackSupervisor#resumeFocusedStackTopActivityLocked ActivityStack#resumeTopActivityUncheckedLocked ActivityStack#resumeTopActivityInnerLocked ActivityStackSupervisor#startSpecificActivityLocked ActivityStackSupervisor#realStartActivityLocked
App端： ApplicationThread#scheduleLaunchActivity ActivityThread#handleLaunchActivity ——ActivityThread#performLaunchActivity ——Activity#onCreate ——Activity#onStart ——ActivityThread#handleResumeActivity ——Activity#onResume
