e6c03a07d0
After showing the heads up for the fullscreen notification, to change the density by user will have the status bar icons not show normally. It will the only one icon overlay on the clock but actually there are more than one icons. And, it can't back to normal after expandable notification and collapse the notification panel. The root cause is that all of instances of PhoneStatusBarView, Clock, HeadsUpStatusBarView, and HeadsUpAppearanceController are recreated by FragmentManager after configuration density and font changing. The new HeadsUpAppearanceController status is neither consistent with HeadsUpManager's status nor the state of the previous instances. The solution is that to apply the onSaveInstanceState and onRestoreInstanceState in PhoneStatusBarView, Clock, PanelBar, and HeadsUpStatusBarView. To make sure that the values of the fields in the new instance, which are set by other source, have the consistence with the state of the old instances. HeadsUpAppearanceController's Constructor. To hook onLayoutChangedListener to sync the status with HeadsUpManager's status to HeadsUpStatusBarView if there is a pinnded heads up notification. In original, PanelBar.mState is the only one state to save. Instead of only saving one, to save the view tree state in CollapsedStatusBarFragment.onSaveInstanceState and restore the view state in CollapsedStatusBarFragment.onViewCreated. CollapsedStatusBarFragment.mDisabled1 doesn't need to save and restore because CommandQueue.recomputeDisableFlags will give it the correct value. After density changed, RemoteViews will reinflate the instances of NotificationHeaderView and the wrapper instances of NoticationContentView will also recreated in NotificationContentView.setAmbientChild. The recreated instance should synchronized with the ExpandableNotificationRow intance. Fixes: 80224819 Fixes: 80426687 Test: atest SystemUITests Change-Id: Ia3f8a0f138f403c8e0c74c00d56bd93baf604d3a
SystemUI
“Everything you see in Android that's not an app”
SystemUI is a persistent process that provides UI for the system but outside of the system_server process.
The starting point for most of sysui code is a list of services that extend SystemUI that are started up by SystemUIApplication. These services then depend on some custom dependency injection provided by Dependency.
Inputs directed at sysui (as opposed to general listeners) generally come in through IStatusBar. Outputs from sysui are through a variety of private APIs to the android platform all over.
SystemUIApplication
When SystemUIApplication starts up, it will start up the services listed in config_systemUIServiceComponents or config_systemUIServiceComponentsPerUser.
Each of these services extend SystemUI. SystemUI provides them with a Context and gives them callbacks for onConfigurationChanged (this historically was the main path for onConfigurationChanged, now also happens through ConfigurationController). They also receive a callback for onBootCompleted since these objects may be started before the device has finished booting.
SystemUI and SystemUIApplication also have methods for putComponent and getComponent which were existing systems to get a hold of other parts of sysui before Dependency existed. Generally new things should not be added to putComponent, instead Dependency and other refactoring is preferred to make sysui structure cleaner.
Each SystemUI service is expected to be a major part of system ui and the goal is to minimize communication between them. So in general they should be relatively silo'd.
Dependencies
The first SystemUI service that is started should always be Dependency. Dependency provides a static method for getting a hold of dependencies that have a lifecycle that spans sysui. Dependency has code for how to create all dependencies manually added. SystemUIFactory is also capable of adding/replacing these dependencies.
Dependencies are lazily initialized, so if a Dependency is never referenced at runtime, it will never be created.
If an instantiated dependency implements Dumpable it will be included in dumps of sysui (and bug reports), allowing it to include current state information. This is how *Controllers dump state to bug reports.
If an instantiated dependency implements ConfigurationChangeReceiver it will receive onConfigurationChange callbacks when the configuration changes.
IStatusBar
CommandQueue is the object that receives all of the incoming events from the system_server. It extends IStatusBar and dispatches those callbacks back any number of listeners. The system_server gets a hold of the IStatusBar when StatusBar calls IStatusBarService#registerStatusBar, so if StatusBar is not included in the XML service list, it will not be registered with the OS.
CommandQueue posts all incoming callbacks to a handler and then dispatches those messages to each callback that is currently registered. CommandQueue also tracks the current value of disable flags and will call #disable immediately for any callbacks added.
There are a few places where CommandQueue is used as a bus to communicate across sysui. Such as when StatusBar calls CommandQueue#recomputeDisableFlags. This is generally used a shortcut to directly trigger CommandQueue rather than calling StatusManager and waiting for the call to come back to IStatusBar.
Default SystemUI services list
com.android.systemui.Dependency
Provides custom dependency injection.
com.android.systemui.util.NotificationChannels
Creates/initializes the channels sysui uses when posting notifications.
com.android.systemui.statusbar.CommandQueue$CommandQueueStart
Creates CommandQueue and calls putComponent because its always been there and sysui expects it to be there :/
com.android.systemui.keyguard.KeyguardViewMediator
Manages keyguard view state.
com.android.systemui.recents.Recents
Recents tracks all the data needed for recents and starts/stops the recents activity. It provides this cached data to RecentsActivity when it is started.
com.android.systemui.volume.VolumeUI
Registers all the callbacks/listeners required to show the Volume dialog when it should be shown.
com.android.systemui.stackdivider.Divider
Shows the drag handle for the divider between two apps when in split screen mode.
com.android.systemui.SystemBars
This is a proxy to the actual SystemUI for the status bar. This loads from config_statusBarComponent which defaults to StatusBar. (maybe this should be removed and copy how config_systemUiVendorServiceComponent works)
com.android.systemui.status.phone.StatusBar
This shows the UI for the status bar and the notification shade it contains. It also contains a significant amount of other UI that interacts with these surfaces (keyguard, AOD, etc.). StatusBar also contains a notification listener to receive notification callbacks.
com.android.systemui.usb.StorageNotification
Tracks USB status and sends notifications for it.
com.android.systemui.power.PowerUI
Tracks power status and sends notifications for low battery/power saver.
com.android.systemui.media.RingtonePlayer
Plays ringtones.
com.android.systemui.keyboard.KeyboardUI
Shows UI for keyboard shortcuts (triggered by keyboard shortcut).
com.android.systemui.pip.PipUI
Shows the overlay controls when Pip is showing.
com.android.systemui.shortcut.ShortcutKeyDispatcher
Dispatches shortcut to System UI components.
@string/config_systemUIVendorServiceComponent
Component allowing the vendor/OEM to inject a custom component.
com.android.systemui.util.leak.GarbageMonitor$Service
Tracks large objects in sysui to see if there are leaks.
com.android.systemui.LatencyTester
Class that only runs on debuggable builds that listens to broadcasts that simulate actions in the system that are used for testing the latency.
com.android.systemui.globalactions.GlobalActionsComponent
Shows the global actions dialog (long-press power).
com.android.systemui.ScreenDecorations
Draws decorations about the screen in software (e.g. rounded corners, cutouts).
com.android.systemui.fingerprint.FingerprintDialogImpl
Fingerprint UI.