SystemUI启动，及其SystemUIService启动

android12-release

SystemServer.run() - startOtherServices - startSystemUi - context.startServiceAsUser - windowManager.onSystemUiStarted()

frameworks/base/core/res/res/values/config.xml

SystemUIService

com.android.systemui/com.android.systemui.SystemUIService
启动服务SystemUIService，运行在进程com.android.systemui
context.startServiceAsUser - SystemUIService.onCreate() - getApplication()).startServicesIfNeeded()

SystemUI服务要启动的类frameworks/base/packages/SystemUI/res/values/config.xml:config_systemUIServiceComponents

    <!-- SystemUI Services: The classes of the stuff to start. --><string-array name="config_systemUIServiceComponents" translatable="false"><item>com.android.systemui.util.NotificationChannels</item><item>com.android.systemui.keyguard.KeyguardViewMediator</item><item>com.android.systemui.recents.Recents</item><item>com.android.systemui.volume.VolumeUI</item><item>com.android.systemui.statusbar.phone.StatusBar</item><item>com.android.systemui.usb.StorageNotification</item><item>com.android.systemui.power.PowerUI</item><item>com.android.systemui.media.RingtonePlayer</item><item>com.android.systemui.keyboard.KeyboardUI</item><item>com.android.systemui.shortcut.ShortcutKeyDispatcher</item><item>@string/config_systemUIVendorServiceComponent</item><item>com.android.systemui.util.leak.GarbageMonitor$Service</item><item>com.android.systemui.LatencyTester</item><item>com.android.systemui.globalactions.GlobalActionsComponent</item><item>com.android.systemui.ScreenDecorations</item><item>com.android.systemui.biometrics.AuthController</item><item>com.android.systemui.SliceBroadcastRelayHandler</item><item>com.android.systemui.statusbar.notification.InstantAppNotifier</item><item>com.android.systemui.theme.ThemeOverlayController</item><item>com.android.systemui.accessibility.WindowMagnification</item><item>com.android.systemui.accessibility.SystemActions</item><item>com.android.systemui.toast.ToastUI</item><item>com.android.systemui.wmshell.WMShell</item></string-array>

例如com.android.systemui.statusbar.phone.StatusBar

startServicesIfNeeded - new StatusBar - StatusBar.start()

start():

createAndAddWindows(result) 添加状态栏
setUpPresenter() 设置初始通知状态NotificationsController.initialize
startKeyguard()
… …

流程图