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1.前言

在10.0的系统rom定制化开发中，在某些特定的产品开发中，需要通过接口来控制系统状态栏的显示和隐藏， 所以就需要了解systemui状态栏的显示构造过程，然后通过相关接口来显示和隐藏状态栏，接下来就来 实现相关的功能

2.通过广播控制systemui状态栏动态显示和隐藏功能实现的核心类

frameworks/base/packages/SystemUl/src/com/android/systemui/statusbar/phone/StatusBar.java

3.通过广播控制systemui状态栏动态显示和隐藏功能实现的核心功能分析和实现

在系统SystemUI状态栏中，StatusBar也是继承SystemUI，启动流程和SystemUI一致。并在start的时候添加创建StatusBar相关的view。 我们从StatusBar的start()方法开始看，从这里来分析下Statusbar的加载流程和工作原理 在系统启动的过程中，在SystemServer.java类中，在启动SystemUIService这个服务以后，这个SystemUIService服务会 调用SystemUI类的Start()方法;SystemUI类又是被BaseStatusBar类实现的；PhoneStatusBar类又继承了 BaseStatusBar类，重写了start()方法，因此实际调用的是PhoneStatusBar的start()方法来完成状态栏的启动。

3.1 StatusBar的创建过程分析

systemui其实结构是比较复杂，里面管理各种服务，导航栏，状态栏，近期列表，下拉菜单，关机界面等， 其中以导航栏和状态栏，近期列表用的比较多，也是本博文会重点讲解的内容。从结构上来讲下拉菜单和 状态栏都是属于statusbar，结构树上也是属于顶层的super_status_bar.xml 创建StatusBar ：createAndAddWindows() ，并且做一些初始化值。

    public class StatusBar extends SystemUI implements DemoMode,ActivityStarter, OnUnlockMethodChangedListener,OnHeadsUpChangedListener, CommandQueue.Callbacks, ZenModeController.Callback,ColorExtractor.OnColorsChangedListener, ConfigurationListener,StatusBarStateController.StateListener, ShadeController,ActivityLaunchAnimator.Callback, AmbientPulseManager.OnAmbientChangedListener,AppOpsController.Callback {protected void makeStatusBarView(@Nullable RegisterStatusBarResult result) {final Context context = mContext;updateDisplaySize(); // populates mDisplayMetricsupdateResources();updateTheme();inflateStatusBarWindow(context);mStatusBarWindow.setService(this);mStatusBarWindow.setOnTouchListener(getStatusBarWindowTouchListener());// TODO: Deal with the ugliness that comes from having some of the statusbar broken out// into fragments, but the rest here, it leaves some awkward lifecycle and whatnot.mNotificationPanel = mStatusBarWindow.findViewById(R.id.notification_panel);mStackScroller = mStatusBarWindow.findViewById(R.id.notification_stack_scroller);mZenController.addCallback(this);NotificationListContainer notifListContainer = (NotificationListContainer) mStackScroller;mNotificationLogger.setUpWithContainer(notifListContainer);mNotificationIconAreaController = SystemUIFactory.getInstance().createNotificationIconAreaController(context, this, mStatusBarStateController);inflateShelf();mNotificationIconAreaController.setupShelf(mNotificationShelf);Dependency.get(DarkIconDispatcher.class).addDarkReceiver(mNotificationIconAreaController);// Allow plugins to reference DarkIconDispatcher and StatusBarStateControllerDependency.get(PluginDependencyProvider.class).allowPluginDependency(DarkIconDispatcher.class);Dependency.get(PluginDependencyProvider.class).allowPluginDependency(StatusBarStateController.class);FragmentHostManager.get(mStatusBarWindow).addTagListener(CollapsedStatusBarFragment.TAG, (tag, fragment) -> {CollapsedStatusBarFragment statusBarFragment =(CollapsedStatusBarFragment) fragment;statusBarFragment.initNotificationIconArea(mNotificationIconAreaController);PhoneStatusBarView oldStatusBarView = mStatusBarView;mStatusBarView = (PhoneStatusBarView) fragment.getView();mStatusBarView.setBar(this);mStatusBarView.setPanel(mNotificationPanel);mStatusBarView.setScrimController(mScrimController);// CollapsedStatusBarFragment re-inflated PhoneStatusBarView and both of// mStatusBarView.mExpanded and mStatusBarView.mBouncerShowing are false.// PhoneStatusBarView's new instance will set to be gone in// PanelBar.updateVisibility after calling mStatusBarView.setBouncerShowing// that will trigger PanelBar.updateVisibility. If there is a heads up showing,// it needs to notify PhoneStatusBarView's new instance to update the correct// status by calling mNotificationPanel.notifyBarPanelExpansionChanged().if (mHeadsUpManager.hasPinnedHeadsUp()) {mNotificationPanel.notifyBarPanelExpansionChanged();}mStatusBarView.setBouncerShowing(mBouncerShowing);if (oldStatusBarView != null) {float fraction = oldStatusBarView.getExpansionFraction();boolean expanded = oldStatusBarView.isExpanded();mStatusBarView.panelExpansionChanged(fraction, expanded);}HeadsUpAppearanceController oldController = mHeadsUpAppearanceController;if (mHeadsUpAppearanceController != null) {// This view is being recreated, let's destroy the old onemHeadsUpAppearanceController.destroy();}mHeadsUpAppearanceController = new HeadsUpAppearanceController(mNotificationIconAreaController, mHeadsUpManager, mStatusBarWindow);mHeadsUpAppearanceController.readFrom(oldController);mStatusBarWindow.setStatusBarView(mStatusBarView);updateAreThereNotifications();checkBarModes();}).getFragmentManager().beginTransaction().replace(R.id.status_bar_container, new CollapsedStatusBarFragment(),CollapsedStatusBarFragment.TAG).commit();mIconController = Dependency.get(StatusBarIconController.class);mHeadsUpManager = new HeadsUpManagerPhone(context, mStatusBarWindow, mGroupManager, this,}.....}

在通过广播控制systemui状态栏动态显示和隐藏功能实现的核心功能中，通过上述的分析得知， makeStatusBarView负责状态栏具体创建 1.加载statusbar设备树super_status_bar ：inflateStatusBarWindow(context)-->mPhoneStatusBarWindow(mSuperStatusBarViewFactory.getStatusBarWindowView())，这个设备树的根View是StatusBarWindowView 2.CollapsedStatusBarFragment就是作为加载状态栏的Fragment mPhoneStatusBarWindow负责状态栏的显示和隐藏功能，所以具体就需要来通过mPhoneStatusBarWindow来 控制状态栏的显示和隐藏

//add core startprivate void showStatusBar() {if (mPhoneStatusBarWindow!=null){mPhoneStatusBarWindow.setVisibility(View.VISIBLE);}}private void hideStatusBar() {if (mPhoneStatusBarWindow != null){mPhoneStatusBarWindow.setVisibility(View.GONE);}}
//add core end@VisibleForTestingprotected void registerBroadcastReceiver() {IntentFilter filter = new IntentFilter();filter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);filter.addAction(Intent.ACTION_SCREEN_OFF);
+        filter.addAction("com.android.action.showstatus");
+        filter.addAction("com.android.action.hidestatus");filter.addAction(DevicePolicyManager.ACTION_SHOW_DEVICE_MONITORING_DIALOG);mBroadcastDispatcher.registerReceiver(mBroadcastReceiver, filter, null, UserHandle.ALL);}private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {if (DEBUG) Log.v(TAG, "onReceive: " + intent);String action = intent.getAction();if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(action)) {KeyboardShortcuts.dismiss();if (mRemoteInputManager.getController() != null) {mRemoteInputManager.getController().closeRemoteInputs();}if (mBubbleController.isStackExpanded()) {mBubbleController.collapseStack();}if (mLockscreenUserManager.isCurrentProfile(getSendingUserId())) {int flags = CommandQueue.FLAG_EXCLUDE_NONE;String reason = intent.getStringExtra("reason");if (reason != null && reason.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {flags |= CommandQueue.FLAG_EXCLUDE_RECENTS_PANEL;}mShadeController.animateCollapsePanels(flags);}} 
//add core start
+         else if("com.android.action.hidestatus".equals(action)) {
+               hideStatusBar(); //隐藏状态栏
+         }
+        else if("com.android.action.showstatus".equals(action)) {
+               showStatusBar(); //显示状态栏
+        }
//add core end}};

在通过广播控制systemui状态栏动态显示和隐藏功能实现的核心功能中，通过上述的分析得知， 在通过上述增加showStatusBar()和hideStatusBar()显示和隐藏状态栏的方法中，通过注册广播 com.android.action.showstatus和com.android.action.hidestatus来调用相对应的方法来 显示和隐藏状态栏的功能实现