Launcher startup process

Launcher The boot process

Android The system starts
SystemServer process
AMS:ActivityManagerService start-up

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Sequence diagram

Judge TaskDisplayArea

getDefaultTaskDisplayArea() Judge

frameworks/base/services/core/java/com/android/server/wm/ActivityTaskManagerService.java

getHomeIntent() This is the traditional Launcher start-up .

shouldPlaceSecondaryHomeOnDisplayArea(taskDisplayArea) Judge

ActivityStartController.startHomeActivity()

frameworks/base/services/core/java/com/android/server/wm/ActivityStartController.java

frameworks/base/services/core/java/com/android/server/wm/ActivityTaskSupervisor.java

Namely Activity Start process , Final ：

1. mService.startProcessAsync(r, knownToBeDead, isTop, isTop ? "top-activity" : "activity");fork Desktop process
2. realStartActivityLocked(r, wpc, andResume, checkConfig); Really start Launcher