Android 10.0 通过广播控制systemui状态栏动态显示和隐藏功能实现
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 mDisplayMetrics
updateResources();
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 StatusBarStateController
Dependency.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 one
mHeadsUpAppearanceController.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 start
private void showStatusBar() {
if (mPhoneStatusBarWindow!=null){
mPhoneStatusBarWindow.setVisibility(View.VISIBLE);
}
}
private void hideStatusBar() {
if (mPhoneStatusBarWindow != null){
mPhoneStatusBarWindow.setVisibility(View.GONE);
}
}
//add core end
@VisibleForTesting
protected 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() {
@Override
public 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