android12-release
APP请求系统通知(“Notifications 通知”拆解)
SystemUI启动，及其SystemUIService启动
SystemUIService中StatusBar注册NotificationListener
com.android.systemui.statusbar.phone.StatusBar
frameworks/base/core/java/android/service/notification/NotificationListenerService.java
mSystemContext = context : SystemUI传递过来的ContextgetNotificationInterface获取NotificationListenerService接口代理，经过binder调用mHandler = new MyHandler(context.getMainLooper()) 这个MyHandler运行在SystemUI进程noMan.registerListener向system_server进程中的NotificationListenerService注册监听器;APP请求系统通知(“Notifications 通知”拆解) 是NotificationListenerWrapper.onNotificationPosted过程是运行在SystemUI进程（即调用NotificationListenerService中NotificationListenerWrapper实例对象的onNotificationPosted()）
NotificationEntryManager.java：SystemUI显示/更新Notification
APP请求系统通知(“Notifications 通知”拆解)通知到SystemUI监听
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/NotificationListener.java
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/notification/NotificationEntryManager.java中注册
