背景：
在wms窗口开发工程师日常工作中，经常需要和WMShell打交道，比如分屏，自由窗口，startingwindow等都移入到了WMShell中。
WMShell是什么？
Google 将原本集中于 WindowManagerService (WMS) 的许多窗口管理相关功能，尤其是动画和特定窗口状态管理，剥离并重构到了 WMShell 中。这使得 WMS 的核心更加稳定，而将一些与用户交互更紧密、变化较快的功能模块化。
那么在平常开发WMShell相关模块时候，需要一些打印或者调试信息应该怎么看呢？
使用WMShell相关帮助信息：
先看看dumpsys WMShell的help
bash
adb shell dumpsys activity service SystemUIService WMShell help展示如下：
bash
SERVICE com.android.systemui/.SystemUIService 69fefe4 pid=786 user=0
Client:
Dump starting: 11-30 11:27:35.326
com.android.systemui.wmshell.WMShell:
----------------------------------------------------------------------------
Window Manager Shell commands:
compatui
restartDialogEnabled [0|false|1|true]
Enable/Disable the restart education dialog for Size Compat Mode
reachabilityEducationEnabled [0|false|1|true]
Enable/Disable the restart education dialog for letterbox reachability
Disable the restart education dialog for letterbox reachability
protolog
status
Get current ProtoLog status.
start
Start proto logging.
stop
Stop proto logging and flush to file.
enable [group...]
Enable proto logging for given groups.
disable [group...]
Disable proto logging for given groups.
enable-text [group...]
Enable logcat logging for given groups.
disable-text [group...]
Disable logcat logging for given groups.
save-for-bugreport
Flush proto logging to file, only if it's enabled.
splitscreen
moveToSideStage <taskId> <SideStagePosition>
Move a task with given id in split-screen mode.
removeFromSideStage <taskId>
Remove a task with given id in split-screen mode.
setSideStagePosition <SideStagePosition>
Sets the position of the side-stage.
switchSplitPosition
Reverses the split.
exitSplitScreen <taskId>
Exits split screen and leaves the provided split task on top.
transitions
help
Print this help text.
<no arguments provided>
Dump all Window Manager Shell internal state
NORMAL dump took 7ms -- com.android.systemui.wmshell.WMShell
Dump took 9ms这里有几个WMShell下面还有若干个子命令compatui，protolog，splitscreen等，可以使用这些子命令进行更加精确的控制WMShell相关的一些给你，当然如果没有输入任何子命令情况下，那就是默认输入所有WMShell的内部dump输出。
常见子命令使用案例
这里经常会有需要打开WMShell相关的一些proto日志，这里以startingwindow为案例进行控制
bash
adb shell dumpsys activity service SystemUIService WMShell protolog enable-text WM_SHELL_STARTING_WINDOW这里的WM_SHELL_STARTING_WINDOW是来自代码：
bash
test@test:~/disk2/aosp14/frameworks/base$ adb shell dumpsys activity service SystemUIService WMShell protolog enable-text WM_SHELL_STARTING_WINDOW
SERVICE com.android.systemui/.SystemUIService 69fefe4 pid=786 user=0
Client:
Dump starting: 11-30 11:48:24.521
com.android.systemui.wmshell.WMShell:
----------------------------------------------------------------------------
Loaded 679 log definitions
Starting logging on groups: [WM_SHELL_STARTING_WINDOW]
NORMAL dump took 9ms -- com.android.systemui.wmshell.WMShell
Dump took 10ms
放开日志后进行日志查看，注意这个时候过滤的TAG又是来自哪里呢？也是可以通过看代码哈：
然后进行过滤这里的ShellStartingWindow字符tag。
bash
test@test:~/disk2/aosp14/frameworks/base$ adb logcat -s ShellStartingWindow
11-30 11:48:32.294 786 922 V ShellStartingWindow: preferredStartingWindowType newTask=true, taskSwitch=true, processRunning=false, allowTaskSnapshot=true, activityCreated=false, isSolidColorSplashScreen=false, legacySplashScreen=false, activityDrawn=false, windowless=false, topIsHome=false
11-30 11:48:32.295 786 922 V ShellStartingWindow: addSplashScreen for package: com.android.dialer with theme: 7f12011e for task: 45, suggestType: 1
11-30 11:48:32.303 786 922 V ShellStartingWindow: addSplashScreen: creating context based on task Configuration {1.0 310mcc260mnc [en_US] ldltr sw411dp w411dp h798dp 560dpi nrml long port finger qwerty/v/v dpad/v winConfig={ mBounds=Rect(0, 0 - 1440, 2960) mAppBounds=Rect(0, 0 - 1440, 2792) mMaxBounds=Rect(0, 0 - 1440, 2960) mDisplayRotation=ROTATION_0 mWindowingMode=fullscreen mActivityType=standard mAlwaysOnTop=undefined mRotation=ROTATION_0} s.2 fontWeightAdjustment=0}
11-30 11:48:32.304 786 922 V ShellStartingWindow: addSplashScreen: apply overrideConfig {1.0 310mcc260mnc [en_US] ldltr sw411dp w411dp h798dp 560dpi nrml long port finger qwerty/v/v dpad/v winConfig={ mBounds=Rect(0, 0 - 1440, 2960) mAppBounds=Rect(0, 0 - 1440, 2792) mMaxBounds=Rect(0, 0 - 1440, 2960) mDisplayRotation=ROTATION_0 mWindowingMode=fullscreen mActivityType=standard mAlwaysOnTop=undefined mRotation=ROTATION_0} s.2 fontWeightAdjustment=0}
11-30 11:48:32.308 786 923 V ShellStartingWindow: getWindowAttrs: window attributes color: 0, replace icon: false
11-30 11:48:32.310 786 923 V ShellStartingWindow: The icon is not an AdaptiveIconDrawable
11-30 11:48:32.999 786 922 V ShellStartingWindow: Task start finish, remove starting surface for task: 45
11-30 11:48:32.999 786 922 V ShellStartingWindow: applyExitAnimation delayed: 0默认输出命令WMShell相关内容：
bash
adb shell dumpsys activity service SystemUIService WMShell
bash
SERVICE com.android.systemui/.SystemUIService 69fefe4 pid=786 user=0
Client:
Dump starting: 11-30 11:32:04.329
com.android.systemui.wmshell.WMShell:
----------------------------------------------------------------------------
BackAnimationController state:
mEnableAnimations=true
mBackGestureStarted=false
mPostCommitAnimationInProgress=false
mShouldStartOnNextMoveEvent=false
mPointerPilfered=false
mRequirePointerPilfer=true
mCurrentTracker state:
BackTouchTracker state:
mState=INITIAL
mTriggerBack=false
mQueuedTracker state:
BackTouchTracker state:
mState=INITIAL
mTriggerBack=false
BubbleController state:
currentUserId= 0
isStatusBarShade= true
isShowingAsBubbleBar= false
isImeVisible= false
BubbleData state:
selected: null
expanded: false
Stack bubble count: 0
Overflow bubble count: 0
SummaryKeys: 0
BubbleImpl.CachedState state:
mIsStackExpanded: false
mSelectedBubbleKey: null
mSuppressedBubbleKeys: 0
mSuppressedGroupToNotifKeys: 0
mAppBubbleTaskIds: []
DragAndDropController
listeners=1
Per display:
displayId=0
hasDrawn=false
isHandlingDrag=false
activeDragCount=0
DragLayout:
mIsLeftRightSplitInPortrait=false
mIsLeftRightSplit=false
mDisplayMargin=56
mDividerSize=35
mIsShowing=false
mHasDropped=false
mCurrentTarget=null
mInsets=Insets{left=0, top=0, right=0, bottom=0}
mTouchableRegion=SkRegion()
OneHandedController
mOffSetFraction=0.4
mLockedDisabled=false
mUserId=0
isShortcutEnabled=false
mIsSwipeToNotificationEnabled=false
OneHandedDisplayAreaOrganizer
mDisplayLayout.rotation()=0
mDisplayAreaTokenMap={}
mDefaultDisplayBounds=Rect(0, 0 - 1440, 2960)
mIsReady=false
mLastVisualDisplayBounds=Rect(0, 0 - 1440, 2960)
mLastVisualOffset=0.0
OneHandedAnimationControllerstates:
mAnimatorMap={}
OneHandedSurfaceTransactionHelperstates:
mEnableCornerRadius=true
mCornerRadiusAdjustment=0.0
mCornerRadius=0.0
OneHandedTouchHandler
mLastUpdatedBounds=Rect(0, 0 - 0, 0)
OneHandedTimeoutHandler
sTimeout=8
sListeners=[com.android.wm.shell.onehanded.OneHandedController$$ExternalSyntheticLambda10@99b68c8]
OneHandedState
sCurrentState=0
OneHandedTutorialHandler
isAttached=false
mCurrentState=0
mDisplayBounds=Rect(0, 0 - 1440, 2960)
mTutorialAreaHeight=1184
mAlphaTransitionStart=710.4
mAlphaAnimationDurationMs=600
BackgroundWindowManager
mDisplayBounds=Rect(0, 0 - 1440, 2960)
mViewHost=null
mLeash=null
mBackgroundView=null
OneHandedAccessibilityUtil
mPackageName=com.android.systemui
mDescription=null
OneHandedSettingsUtil
isOneHandedModeEnable=false
isSwipeToNotificationEnabled=false
oneHandedTimeOut=8
tapsAppToExit=true
shortcutActivated=false
tutorialShownCounts=0
SystemPerformanceHinter:
Active sessions (0):
PipController
PhonePipMenuController
mMenuState=0
mPipMenuView=null
mListeners=1
PipTouchHandler
mMenuState=0
mIsImeShowing=false
mImeHeight=0
mIsShelfShowing=false
mShelfHeight=0
mSavedSnapFraction=-1.0
mMovementBoundsExtraOffsets=0
PipBoundsAlgorithm
mDefaultAspectRatio=1.777778
mMinAspectRatio=0.41841003
mMaxAspectRatio=2.39
mDefaultStackGravity=85
mSnapAlgorithmcom.android.wm.shell.common.pip.PipSnapAlgorithm@c801d47
PipTouchState
mAllowTouches=true
mAllowInputEvents=true
mActivePointerId=0
mLastTouchDisplayId=-1
mDownTouch=PointF(0.0, 0.0)
mDownDelta=PointF(0.0, 0.0)
mLastTouch=PointF(0.0, 0.0)
mLastDelta=PointF(0.0, 0.0)
mVelocity=PointF(0.0, 0.0)
mIsUserInteracting=false
mIsDragging=false
mStartedDragging=false
mAllowDraggingOffscreen=false
PipResizeGestureHandler
mAllowGesture=false
mIsAttached=false
mIsEnabled=false
mEnablePinchResize=true
mThresholdCrossed=false
mOhmOffset=0
mMinSize=Point(672, 378)
mMaxSize=Point(1328, 746)
PipBoundsAlgorithm
mDefaultAspectRatio=1.777778
mMinAspectRatio=0.41841003
mMaxAspectRatio=2.39
mDefaultStackGravity=85
mSnapAlgorithmcom.android.wm.shell.common.pip.PipSnapAlgorithm@c801d47
PipTaskOrganizer
mTaskInfo=null
mToken=null binder=null
mLeash=null
mPipOverlay=null
mState=0
mPictureInPictureParams=null
PipTransition
mCurrentPipTaskToken=null
mFinishCallback=null
PipPerfHintController
activeSessionCount=0
PipBoundsState
mBounds=Rect(0, 0 - 0, 0)
mNormalBounds=Rect(587, 2288 - 1384, 2736)
mExpandedBounds=Rect(0, 0 - 797, 448)
mMovementBounds=Rect(56, 140 - 1384, 2736)
mNormalMovementBounds=Rect(56, 140 - 587, 2288)
mExpandedMovementBounds=Rect(56, 140 - 587, 2288)
mLastPipComponentName=null
mAspectRatio=1.777778
mStashedState=0
mStashOffset=112
mIsImeShowing=false
mImeHeight=0
mIsShelfShowing=false
mShelfHeight=0
mHasUserMovedPip=false
mHasUserResizedPip=false
mMinSize=Point(672, 378)
mMaxSize=Point(1328, 746)
mBoundsScale0.0
mPipReentryState=null
PipBoundsState$LauncherState
getAppIconSizePx=196
PipBoundsState$MotionBoundsState
mBoundsInMotion=Rect(0, 0 - 0, 0)
mAnimatingToBounds=Rect(0, 0 - 0, 0)
mOverrideMinSize=null
mOverridableMinSize=168
mDefaultMinSize=378
mDefaultSizePercent=0.6
mMinimumSizePercent=0.5
mOptimizedAspectRatio=0.5625
PipInputConsumer
registered=false
PipDisplayLayoutState
mDisplayId=0
getDisplayBounds=Rect(0, 0 - 1440, 2960)
mScreenEdgeInsets=Point(56, 56)
RecentTasksController
mListener=com.android.wm.shell.recents.RecentTasksController$IRecentTasksImpl$1@7624974
Tasks:
Task1: id=42 baseIntent=ComponentInfo{com.android.dialer/com.android.dialer.main.impl.MainActivity} winMode=undefined, Type=TYPE_SINGLE
Task1: id=41 baseIntent=ComponentInfo{com.android.messaging/com.android.messaging.ui.conversationlist.ConversationListActivity} winMode=undefined, Type=TYPE_SINGLE
Task1: id=36 baseIntent=ComponentInfo{com.example.android.miwok/com.example.android.miwok.MainActivity} winMode=undefined, Type=TYPE_SINGLE
Task1: id=35 baseIntent=ComponentInfo{com.android.calendar/com.android.calendar.AllInOneActivity} winMode=undefined, Type=TYPE_SINGLE
Task1: id=31 baseIntent=ComponentInfo{com.android.documentsui/com.android.documentsui.files.FilesActivity} winMode=undefined, Type=TYPE_SINGLE
Task1: id=29 baseIntent=ComponentInfo{com.example.audiotrackdemo/com.example.audiotrackdemo.MainActivity} winMode=undefined, Type=TYPE_SINGLE
Task1: id=28 baseIntent=ComponentInfo{com.android.contacts/com.android.contacts.activities.PeopleActivity} winMode=undefined, Type=TYPE_SINGLE
Task1: id=27 baseIntent=ComponentInfo{com.android.deskclock/com.android.deskclock.DeskClock} winMode=undefined, Type=TYPE_SINGLE
ShellController
mConfigChangeListeners=4
mLastConfiguration={1.0 310mcc260mnc [en_US] ldltr sw411dp w411dp h846dp 560dpi nrml long port finger qwerty/v/v dpad/v winConfig={ mBounds=Rect(0, 0 - 1440, 2960) mAppBounds=Rect(0, 0 - 1440, 2960) mMaxBounds=Rect(0, 0 - 1440, 2960) mDisplayRotation=ROTATION_0 mWindowingMode=fullscreen mActivityType=undefined mAlwaysOnTop=undefined mRotation=ROTATION_0} s.18 fontWeightAdjustment=0}
mKeyguardChangeListeners=5
mUserChangeListeners=2
mExternalInterfaces={
extra_shell_split_screen: com.android.wm.shell.splitscreen.SplitScreenController$ISplitScreenImpl@af2ce9d
extra_shell_drag_and_drop: com.android.wm.shell.draganddrop.DragAndDropController$IDragAndDropImpl@ec3ff12
extra_shell_shell_transitions: com.android.wm.shell.transition.Transitions$IShellTransitionsImpl@b1746e3
extra_shell_one_handed: com.android.wm.shell.onehanded.OneHandedController$IOneHandedImpl@71488e0
extra_shell_recent_tasks: com.android.wm.shell.recents.RecentTasksController$IRecentTasksImpl@2b2b799
extra_shell_back_animation: com.android.wm.shell.back.BackAnimationController$IBackAnimationImpl@35efa5e
extra_shell_pip: com.android.wm.shell.pip.phone.PipController$IPipImpl@26d6e3f
extra_shell_starting_window: com.android.wm.shell.startingsurface.StartingWindowController$IStartingWindowImpl@3e9530c
extra_shell_bubbles: com.android.wm.shell.bubbles.BubbleController$IBubblesImpl@8ee3455
}
ShellTaskOrganizer
5 Listeners
#4 taskId#5
#3 taskId#4
#2 taskId#3
StageCoordinator mDisplayId=0
mDividerVisible=false
isSplitActive=false
isSplitVisible=false
isLeftRightSplit=false
MainStage
stagePosition=SPLIT_POSITION_TOP_OR_LEFT
isActive=false
MainStageListener
mHasRootTask=true
mVisible=false
mHasChildren=false
SideStage
stagePosition=SPLIT_POSITION_BOTTOM_OR_RIGHT
SideStageListener
mHasRootTask=true
mVisible=false
mHasChildren=false
SplitLayout:
mAllowLeftRightSplitInPortrait=false
mIsLeftRightSplit=false
mFreezeDividerWindow=false
mDimNonImeSide=true
mDividerPosition=1463
bounds1=[0,0][1440,1463]
dividerBounds=[0,1396][1440,1565]
bounds2=[0,1498][1440,2960]
#1 TASK_LISTENER_TYPE_FULLSCREEN
FullscreenTaskListener:TASK_LISTENER_TYPE_FULLSCREEN
1 Tasks
#0 TASK_LISTENER_TYPE_PIP
PipTaskOrganizer
mTaskInfo=null
mToken=null binder=null
mLeash=null
mPipOverlay=null
mState=0
mPictureInPictureParams=null
PipTransition
mCurrentPipTaskToken=null
mFinishCallback=null
PipPerfHintController
activeSessionCount=0
4 Tasks
#3 task=5 listener=com.android.wm.shell.splitscreen.SideStage@1c5e6a wmMode=6 pkg= bounds=Rect(0, 2960 - 1440, 4440) running=false visible=false focused=false
#2 task=4 listener=com.android.wm.shell.splitscreen.MainStage@d4af5b wmMode=6 pkg= bounds=Rect(0, 0 - 1440, 2960) running=false visible=false focused=false
#1 task=3 listener=com.android.wm.shell.splitscreen.StageCoordinator@ee23815 wmMode=1 pkg= bounds=Rect(0, 0 - 1440, 2960) running=false visible=false focused=false
#0 task=1 listener=FullscreenTaskListener:TASK_LISTENER_TYPE_FULLSCREEN wmMode=1 pkg=com.android.launcher3 bounds=Rect(0, 0 - 1440, 2960) running=true visible=true focused=true
0 Launch Cookies
SplitScreenController
StageCoordinator mDisplayId=0
mDividerVisible=false
isSplitActive=false
isSplitVisible=false
isLeftRightSplit=false
MainStage
stagePosition=SPLIT_POSITION_TOP_OR_LEFT
isActive=false
MainStageListener
mHasRootTask=true
mVisible=false
mHasChildren=false
SideStage
stagePosition=SPLIT_POSITION_BOTTOM_OR_RIGHT
SideStageListener
mHasRootTask=true
mVisible=false
mHasChildren=false
SplitLayout:
mAllowLeftRightSplitInPortrait=false
mIsLeftRightSplit=false
mFreezeDividerWindow=false
mDimNonImeSide=true
mDividerPosition=1463
bounds1=[0,0][1440,1463]
dividerBounds=[0,1396][1440,1565]
bounds2=[0,1498][1440,2960]
ShellTransitions
Handlers:
DefaultTransitionHandler (3bb4091)
RemoteTransitionHandler (8a6772a)
StageCoordinator (ee23815)
RecentsTransitionHandler (2600dcc)
ActivityEmbeddingController (9735bff)
PipTransition (9b5071e)
KeyguardTransitionHandler (719ff59)
DefaultMixedHandler (c7117a0)
Registered Remotes:
QuickstepLaunchHome (35e93f8)
Registered Takeover Remotes:
none
Observers:
TaskStackTransitionObserver
BubblesTransitionObserver
HomeTransitionObserver
Pending Transitions:
none
Ready-during-sync Transitions:
none
Tracks:
Track #0
active=null
SurfaceControlRegistry
----------------------
Listing oldest 11 of 11
Task=1 (readFromParcel) [614s ago]
DefaultTaskDisplayArea (RootTaskDisplayAreaOrganizer.onDisplayAreaAppeared) [614s ago]
Task=3 (ShellTaskOrganizer.onTaskAppeared) [614s ago]
Task=4 (ShellTaskOrganizer.onTaskAppeared) [614s ago]
Task=5 (ShellTaskOrganizer.onTaskAppeared) [614s ago]
Display 0 name="Built-in Screen" (RootDisplayAreaOrganizer.onDisplayAreaAppeared) [614s ago]
Dim layer (SurfaceUtils.makeColorLayer) [614s ago]
Dim layer (SurfaceUtils.makeColorLayer) [614s ago]
Wallpaper BBQ wrapper (Wallpaper#relayout) [612s ago]
StatusBar (readFromParcel) [605s ago]
com.android.systemui.wallpapers.ImageWallpaper (readFromParcel) [604s ago]
sCallStackDebuggingInitialized=true
sCallStackDebuggingEnabled=false
sCallStackDebuggingMatchName=
sCallStackDebuggingMatchCall=
NORMAL dump took 10ms -- com.android.systemui.wmshell.WMShell
Dump took 10ms
test@test:~/disk2/aosp14/frameworks/base$ 我们比较熟悉的SplitScreen相关，Pip相关，单手模式等都有相关的dump信息输出。
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