Android14 SystemUI 启动流程（2）

/frameworks/base/packages/SystemUI/src/com/android/systemui/SystemUIApplication.java

    启动实现了CoreStartable的实体类：如CentralSurfacesImpl等等，去start,去onBootCompleted
    /**
     * Makes sure that all the SystemUI services are running. If they are already running, this is a
     * no-op. This is needed to conditinally start all the services, as we only need to have it in
     * the main process.
     * <p>This method must only be called from the main thread.</p>
     */

    public void startServicesIfNeeded() {
        final String vendorComponent = mInitializer.getVendorComponent(getResources());

        // Sort the startables so that we get a deterministic ordering.
        // TODO: make #start idempotent and require users of CoreStartable to call it.
        Map<Class<?>, Provider<CoreStartable>> sortedStartables = new TreeMap<>(
                Comparator.comparing(Class::getName));
        sortedStartables.putAll(mSysUIComponent.getStartables());
        sortedStartables.putAll(mSysUIComponent.getPerUserStartables());
        startServicesIfNeeded(
                sortedStartables, "StartServices", vendorComponent);
    }

1.这里通过依赖注入将CoreStartable实现类保存这个Map中！

/frameworks/base/packages/SystemUI/src/com/android/systemui/dagger/SysUIComponent.java

   /**
     * Returns {@link CoreStartable}s that should be started with the application.
     */
    Map<Class<?>, Provider<CoreStartable>> getStartables();

2.这里是对super_notification_shade.xml（整个下拉菜单栏布局文件）和status_bar.xml（桌面状态栏）和navigation_bar.xml（导航栏）等布局进行初始化

/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/dagger/StartCentralSurfacesModule.kt

@Module
interface StartCentralSurfacesModule {
    /** Start the CentralSurfaces   */
    @Binds
    @IntoMap :将这个实现类注入到Map<Class<?>, Provider<CoreStartable>>中取
    @ClassKey(CentralSurfaces::class) :map的键是CentralSurfaces.class
    abstract fun bindsCentralSurfaces(centralSurfaces: CentralSurfacesImpl): CoreStartable
}

/frameworks/base/packages/SystemUI/src/com/android/systemui/dagger/SystemUICoreStartableModule.kt

/**
 * Collection of {@link CoreStartable}s that should be run on AOSP.
 */
@Module(includes = [
    MultiUserUtilsModule::class,
    StartControlsStartableModule::class,
    StartBinderLoggerModule::class,
    WallpaperModule::class,
])
abstract class SystemUICoreStartableModule {
    /** Inject into AuthController.  */
    @Binds
    @IntoMap
    @ClassKey(AuthController::class)
    abstract fun bindAuthController(service: AuthController): CoreStartable

    /** Inject into BiometricNotificationService */
    @Binds
    @IntoMap
    @ClassKey(BiometricNotificationService::class)
    abstract fun bindBiometricNotificationService(
        service: BiometricNotificationService
    ): CoreStartable

    /** Inject into ClipboardListener.  */
    @Binds
    @IntoMap
    @ClassKey(ClipboardListener::class)
    abstract fun bindClipboardListener(sysui: ClipboardListener): CoreStartable

    /** Inject into GlobalActionsComponent.  */
    @Binds
    @IntoMap
    @ClassKey(GlobalActionsComponent::class)
    abstract fun bindGlobalActionsComponent(sysui: GlobalActionsComponent): CoreStartable

    /** Inject into InstantAppNotifier.  */
    @Binds
    @IntoMap
    @ClassKey(InstantAppNotifier::class)
    abstract fun bindInstantAppNotifier(sysui: InstantAppNotifier): CoreStartable

    /** Inject into KeyboardUI.  */
    @Binds
    @IntoMap
    @ClassKey(KeyboardUI::class)
    abstract fun bindKeyboardUI(sysui: KeyboardUI): CoreStartable

    /** Inject into MediaProjectionTaskSwitcherCoreStartable. */
    @Binds
    @IntoMap
    @ClassKey(MediaProjectionTaskSwitcherCoreStartable::class)
    abstract fun bindProjectedTaskListener(
            sysui: MediaProjectionTaskSwitcherCoreStartable
    ): CoreStartable

    /** Inject into KeyguardBiometricLockoutLogger */
    @Binds
    @IntoMap
    @ClassKey(KeyguardBiometricLockoutLogger::class)
    abstract fun bindKeyguardBiometricLockoutLogger(
        sysui: KeyguardBiometricLockoutLogger
    ): CoreStartable

    /** Inject into KeyguardViewMediator.  */
    @Binds
    @IntoMap
    @ClassKey(KeyguardViewMediator::class)
    abstract fun bindKeyguardViewMediator(sysui: KeyguardViewMediator): CoreStartable

    /** Inject into LatencyTests.  */
    @Binds
    @IntoMap
    @ClassKey(LatencyTester::class)
    abstract fun bindLatencyTester(sysui: LatencyTester): CoreStartable

    /** Inject into NotificationChannels.  */
    @Binds
    @IntoMap
    @ClassKey(NotificationChannels::class)
    @PerUser
    abstract fun bindNotificationChannels(sysui: NotificationChannels): CoreStartable

    /** Inject into PowerUI.  */
    @Binds
    @IntoMap
    @ClassKey(PowerUI::class)
    abstract fun bindPowerUI(sysui: PowerUI): CoreStartable

    /** Inject into Recents.  */
    @Binds
    @IntoMap
    @ClassKey(Recents::class)
    abstract fun bindRecents(sysui: Recents): CoreStartable

    /** Inject into ImmersiveModeConfirmation.  */
    @Binds
    @IntoMap
    @ClassKey(ImmersiveModeConfirmation::class)
    abstract fun bindImmersiveModeConfirmation(sysui: ImmersiveModeConfirmation): CoreStartable

    /** Inject into RingtonePlayer.  */
    @Binds
    @IntoMap
    @ClassKey(RingtonePlayer::class)
    abstract fun bind(sysui: RingtonePlayer): CoreStartable

    /** Inject into ScreenDecorations.  */
    @Binds
    @IntoMap
    @ClassKey(ScreenDecorations::class)
    abstract fun bindScreenDecorations(sysui: ScreenDecorations): CoreStartable

    /** Inject into GesturePointerEventHandler. */
    @Binds
    @IntoMap
    @ClassKey(GesturePointerEventListener::class)
    abstract fun bindGesturePointerEventListener(sysui: GesturePointerEventListener): CoreStartable

    /** Inject into SessionTracker.  */
    @Binds
    @IntoMap
    @ClassKey(SessionTracker::class)
    abstract fun bindSessionTracker(service: SessionTracker): CoreStartable

    /** Inject into ShortcutKeyDispatcher.  */
    @Binds
    @IntoMap
    @ClassKey(ShortcutKeyDispatcher::class)
    abstract fun bindShortcutKeyDispatcher(sysui: ShortcutKeyDispatcher): CoreStartable

    /** Inject into SliceBroadcastRelayHandler.  */
    @Binds
    @IntoMap
    @ClassKey(SliceBroadcastRelayHandler::class)
    abstract fun bindSliceBroadcastRelayHandler(sysui: SliceBroadcastRelayHandler): CoreStartable

    /** Inject into StorageNotification.  */
    @Binds
    @IntoMap
    @ClassKey(StorageNotification::class)
    abstract fun bindStorageNotification(sysui: StorageNotification): CoreStartable

    /** Inject into SystemActions.  */
    @Binds
    @IntoMap
    @ClassKey(SystemActions::class)
    abstract fun bindSystemActions(sysui: SystemActions): CoreStartable

    /** Inject into ThemeOverlayController.  */
    @Binds
    @IntoMap
    @ClassKey(ThemeOverlayController::class)
    abstract fun bindThemeOverlayController(sysui: ThemeOverlayController): CoreStartable

    /** Inject into ToastUI.  */
    @Binds
    @IntoMap
    @ClassKey(ToastUI::class)
    abstract fun bindToastUI(service: ToastUI): CoreStartable

    /** Inject into MediaOutputSwitcherDialogUI.  */
    @Binds
    @IntoMap
    @ClassKey(MediaOutputSwitcherDialogUI::class)
    abstract fun MediaOutputSwitcherDialogUI(sysui: MediaOutputSwitcherDialogUI): CoreStartable

    /** Inject into VolumeUI.  */
    @Binds
    @IntoMap
    @ClassKey(VolumeUI::class)
    abstract fun bindVolumeUI(sysui: VolumeUI): CoreStartable

    /** Inject into WindowMagnification.  */
    @Binds
    @IntoMap
    @ClassKey(WindowMagnification::class)
    abstract fun bindWindowMagnification(sysui: WindowMagnification): CoreStartable

    /** Inject into WMShell.  */
    @Binds
    @IntoMap
    @ClassKey(WMShell::class)
    abstract fun bindWMShell(sysui: WMShell): CoreStartable

    /** Inject into KeyguardLiftController.  */
    @Binds
    @IntoMap
    @ClassKey(KeyguardLiftController::class)
    abstract fun bindKeyguardLiftController(sysui: KeyguardLiftController): CoreStartable

    /** Inject into MediaTttSenderCoordinator. */
    @Binds
    @IntoMap
    @ClassKey(MediaTttSenderCoordinator::class)
    abstract fun bindMediaTttSenderCoordinator(sysui: MediaTttSenderCoordinator): CoreStartable

    /** Inject into MediaTttChipControllerReceiver. */
    @Binds
    @IntoMap
    @ClassKey(MediaTttChipControllerReceiver::class)
    abstract fun bindMediaTttChipControllerReceiver(
            sysui: MediaTttChipControllerReceiver
    ): CoreStartable

    /** Inject into MediaTttCommandLineHelper. */
    @Binds
    @IntoMap
    @ClassKey(MediaTttCommandLineHelper::class)
    abstract fun bindMediaTttCommandLineHelper(sysui: MediaTttCommandLineHelper): CoreStartable

    /** Inject into ChipbarCoordinator. */
    @Binds
    @IntoMap
    @ClassKey(ChipbarCoordinator::class)
    abstract fun bindChipbarController(sysui: ChipbarCoordinator): CoreStartable


    /** Inject into RearDisplayDialogController) */
    @Binds
    @IntoMap
    @ClassKey(RearDisplayDialogController::class)
    abstract fun bindRearDisplayDialogController(sysui: RearDisplayDialogController): CoreStartable

    /** Inject into StylusUsiPowerStartable) */
    @Binds
    @IntoMap
    @ClassKey(StylusUsiPowerStartable::class)
    abstract fun bindStylusUsiPowerStartable(sysui: StylusUsiPowerStartable): CoreStartable

    @Binds
    @IntoMap
    @ClassKey(PhysicalKeyboardCoreStartable::class)
    abstract fun bindKeyboardCoreStartable(listener: PhysicalKeyboardCoreStartable): CoreStartable

    /** Inject into MuteQuickAffordanceCoreStartable*/
    @Binds
    @IntoMap
    @ClassKey(MuteQuickAffordanceCoreStartable::class)
    abstract fun bindMuteQuickAffordanceCoreStartable(
            sysui: MuteQuickAffordanceCoreStartable
    ): CoreStartable

    /**Inject into DreamMonitor */
    @Binds
    @IntoMap
    @ClassKey(DreamMonitor::class)
    abstract fun bindDreamMonitor(sysui: DreamMonitor): CoreStartable

    /**Inject into AssistantAttentionMonitor */
    @Binds
    @IntoMap
    @ClassKey(AssistantAttentionMonitor::class)
    abstract fun bindAssistantAttentionMonitor(sysui: AssistantAttentionMonitor): CoreStartable

    @Binds
    @IntoMap
    @ClassKey(KeyguardViewConfigurator::class)
    abstract fun bindKeyguardViewConfigurator(impl: KeyguardViewConfigurator): CoreStartable

    @Binds
    @IntoMap
    @ClassKey(LockscreenWallpaper::class)
    abstract fun bindLockscreenWallpaper(impl: LockscreenWallpaper): CoreStartable

    @Binds
    @IntoMap
    @ClassKey(ScrimController::class)
    abstract fun bindScrimController(impl: ScrimController): CoreStartable

    @Binds
    @IntoMap
    @ClassKey(StatusBarHeadsUpChangeListener::class)
    abstract fun bindStatusBarHeadsUpChangeListener(
        impl: StatusBarHeadsUpChangeListener
    ): CoreStartable
}

startable.start();启动每个CoreStartable实现类的start()方法

/frameworks/base/packages/SystemUI/src/com/android/systemui/SystemUIApplication.java

  private void startServicesIfNeeded(
            Map<Class<?>, Provider<CoreStartable>> startables,
            String metricsPrefix,
            String vendorComponent) {
        if (mServicesStarted) {
            return;
        }
        mServices = new CoreStartable[startables.size() + (vendorComponent == null ? 0 : 1)];

        int i = 0;
        for (Map.Entry<Class<?>, Provider<CoreStartable>> entry : startables.entrySet()) {
            String clsName = entry.getKey().getName();
            int j = i;  // Copied to make lambda happy.
            timeInitialization(
                    clsName,
                    () -> mServices[j] = startStartable(clsName, entry.getValue()),
                    log,
                    metricsPrefix);
            i++;
        }

       
        for (i = 0; i < mServices.length; i++) {
            CoreStartable service = mServices[i];
            if (mBootCompleteCache.isBootComplete()) {
                notifyBootCompleted(service);
            }

            if (service.isDumpCritical()) {
                dumpManager.registerCriticalDumpable(service.getClass().getName(), service);
            } else {
                dumpManager.registerNormalDumpable(service.getClass().getName(), service);
            }
        }

    }




    private static CoreStartable startStartable(String clsName, Provider<CoreStartable> provider) {
        if (DEBUG) Log.d(TAG, "loading: " + clsName);
        if (Trace.isEnabled()) {
            Trace.traceBegin(
                    Trace.TRACE_TAG_APP, "Provider<" + clsName + ">.get()");
        }
        CoreStartable startable = provider.get();
        Trace.endSection();
        return startStartable(startable);
    }



    private static CoreStartable startStartable(CoreStartable startable) {
        if (DEBUG) Log.d(TAG, "running: " + startable);
        if (Trace.isEnabled()) {
            Trace.traceBegin(
                    Trace.TRACE_TAG_APP, startable.getClass().getSimpleName() + ".start()");
        }
        startable.start();
        Trace.endSection();

        return startable;
    }

3.主要看CentralSurfacesImpl.java(整个下拉菜单栏的启动入口)