android – 了解ViewTreeObserver泄漏

概述我正在使用LeakCanary 1.3.1-SNAPSHOT. 我发现有关ViewTreeObserver.OnScrollChangedListener设置的泄漏,我修复了它,如下面的代码： private ViewTreeObserver.OnScrollChangedListener scrollViewChangeListener; @Override protected void 我正在使用LeakCanary 1.3.1-SNAPSHOT.
我发现有关VIEwTreeObserver.OnScrollChangedListener设置的泄漏,我修复了它,如下面的代码：

private VIEwTreeObserver.OnScrollChangedListener scrollVIEwchangelistener;  @OverrIDe protected voID onFinishInflate() {      super.onFinishInflate();      ButterKnife.inject(this);      scrollVIEwchangelistener = new VIEwTreeObserver.OnScrollChangedListener() {      @OverrIDe public voID onScrollChanged() {        EventDetailsVIEw.this.onScrollChanged(scrollVIEw.getScrollY());      }    };      scrollVIEw.getVIEwTreeObserver()        .addOnScrollChangedListener(scrollVIEwchangelistener);  }  @OverrIDe public voID onDetachedFromWindow() {      super.onDetachedFromWindow();      scrollVIEw.getVIEwTreeObserver().removeOnScrollChangedListener(scrollVIEwchangelistener);  }

然而,LeakCanary仍然将其报告为泄漏,任何想法为什么？

* com.couchsurfing.mobile.ui.events.detail.EventDetailsScreen$Presenter has leaked:* GC ROOT androID.vIEw.inputmethod.inputMethodManager.this
@OverrIDe public voID onDetachedFromWindow() {    scrollVIEw.getVIEwTreeObserver().removeOnScrollChangedListener(scrollVIEwchangelistener);    super.onDetachedFromWindow();}
 (anonymous class extends com.androID.internal.vIEw.IinputMethodClIEnt$Stub)* references androID.vIEw.inputmethod.inputMethodManager.mCurRootVIEw* references com.androID.internal.policy.impl.PhoneWindow$DecorVIEw.mAttachInfo* references androID.vIEw.VIEw$AttachInfo.mTreeObserver* references androID.vIEw.VIEwTreeObserver.mOnScrollChangedListeners* references androID.vIEw.VIEwTreeObserver$copyOnWriteArray.mData* references java.util.ArrayList.array* references array java.lang.Object[].[0]* references com.couchsurfing.mobile.ui.events.detail.EventDetailsVIEw.this (anonymous class implements androID.vIEw.VIEwTreeObserver$OnScrollChangedListener)* references com.couchsurfing.mobile.ui.events.detail.EventDetailsVIEw.presenter* leaks com.couchsurfing.mobile.ui.events.detail.EventDetailsScreen$Presenter instance* Reference Key: 69d0a429-ae27-48fc-a8e0-033c920dd07c* Device: LGE Google Nexus 5 hammerhead* AndroID Version: 5.1 API: 22 LeakCanary: 1.3.1-SNAPSHOT* Durations: watch=5032ms,gc=165ms,heap dump=2932ms,analysis=29907ms* Details:* Instance of androID.vIEw.inputmethod.inputMethodManager|   this = androID.vIEw.inputmethod.inputMethodManager [ID=0x130239c0]|   mDescriptor = java.lang.String [ID=0x6f5e3f38]|   mObject = -1601862176|   mOwner = androID.vIEw.inputmethod.inputMethodManager [ID=0x13112da0]* Instance of androID.vIEw.inputmethod.inputMethodManager|   static $staticOverhead = byte[] [ID=0x6fe25d29;length=240;size=256]|   static CONTRol_START_INITIAL = 256|   static CONTRol_WINDOW_FirsT = 4|   static CONTRol_WINDOW_IS_TEXT_EDITOR = 2|   static CONTRol_WINDOW_VIEW_HAS_FOCUS = 1|   static DEBUG = false|   static disPATCH_HANDLED = 1|   static disPATCH_IN_PROGRESS = -1|   static disPATCH_NOT_HANDLED = 0|   static HIDE_IMPliCIT_ONLY = 1|   static HIDE_NOT_ALWAYS = 2|   static input_METHOD_NOT_RESPONDING_TIMEOUT = 2500|   static MSG_BIND = 2|   static MSG_DUMP = 1|   static MSG_FLUSH_input_EVENT = 7|   static MSG_SEND_input_EVENT = 5|   static MSG_SET_ACTIVE = 4|   static MSG_SET_USER_ACTION_NOTIFICATION_SEQUENCE_NUMBER = 9|   static MSG_TIMEOUT_input_EVENT = 6|   static MSG_UNBIND = 3|   static NOT_AN_ACTION_NOTIFICATION_SEQUENCE_NUMBER = -1|   static PENDING_EVENT_COUNTER = java.lang.String [ID=0x6f5bb948]|   static REQUEST_UPDATE_CURSOR_ANCHOR_INFO_NONE = 0|   static RESulT_HIDDEN = 3|   static RESulT_SHOWN = 2|   static RESulT_UNCHANGED_HIDDEN = 1|   static RESulT_UNCHANGED_SHOWN = 0|   static SHOW_FORCED = 2|   static SHOW_IMPliCIT = 1|   static TAG = java.lang.String [ID=0x6f5a76e0]|   static sInstance = androID.vIEw.inputmethod.inputMethodManager [ID=0x130239c0]|   mActive = true|   mBindSequence = 1523|   mClIEnt = androID.vIEw.inputmethod.inputMethodManager [ID=0x13112da0]|   mCompletions = null|   mCurChannel = androID.vIEw.inputChannel [ID=0x1304a850]|   mCurID = java.lang.String [ID=0x1325dd80]|   mCurMethod = com.androID.internal.vIEw.IinputMethodSession$Stub$Proxy [ID=0x1304a840]|   mCurRootVIEw = com.androID.internal.policy.impl.PhoneWindow$DecorVIEw [ID=0x12eac000]|   mCurSender = androID.vIEw.inputmethod.inputMethodManager$ImeinputEventSender [ID=0x12c72850]|   mCurrentTextBoxAttribute = androID.vIEw.inputmethod.EditorInfo [ID=0x133036c0]|   mCursorAnchorInfo = null|   mCursorCandEnd = 0|   mCursorCandStart = 0|   mCursorRect = androID.graphics.Rect [ID=0x13112d40]|   mCursorSelEnd = 0|   mCursorSelStart = 0|   mDummyinputConnection = androID.vIEw.inputmethod.BaseinputConnection [ID=0x13112dc0]|   mFullscreenMode = false|   mH = androID.vIEw.inputmethod.inputMethodManager$H [ID=0x13112de0]|   mHasBeenInactive = false|   mIinputContext = androID.vIEw.inputmethod.inputMethodManager$ControlledinputConnectionWrapper [ID=0x13113310]|   mLastSentUserActionNotificationSequenceNumber = -1|   mMainLooper = androID.os.Looper [ID=0x12c76be0]|   mNextServedVIEw = com.couchsurfing.mobile.ui.drawer.DrawerVIEw [ID=0x131f8c00]|   mNextUserActionNotificationSequenceNumber = 1|   mPendingEventPool = androID.util.Pools$SimplePool [ID=0x13110fe0]|   mPendingEvents = androID.util.SparseArray [ID=0x13112d80]|   mRequestUpdateCursorAnchorInfoMonitorMode = 0|   mServedConnecting = false|   mServedinputConnection = null|   mServedinputConnectionWrapper = null|   mServedVIEw = com.couchsurfing.mobile.ui.drawer.DrawerVIEw [ID=0x131f8c00]|   mService = com.androID.internal.vIEw.IinputMethodManager$Stub$Proxy [ID=0x13110fc0]|   mTmpCursorRect = androID.graphics.Rect [ID=0x13112d20]|   mVIEwToScreenMatrix = androID.graphics.Matrix [ID=0x13110fd0]|   mVIEwtopleft = int[] [ID=0x13112d60;length=2;size=24]* Instance of com.androID.internal.policy.impl.PhoneWindow$DecorVIEw|   mActionMode = null|   mActionModePopup = null|   mActionModeVIEw = null|   mBackgroundFallback = com.androID.internal.Widget.BackgroundFallback [ID=0x12fdd8e0]|   mBackgroundpadding = androID.graphics.Rect [ID=0x12ffd9a0]|   mbarEnterExitDuration = 250|   mChanging = false|   mDefaultopacity = -1|   mDownY = 0|   mDrawingBounds = androID.graphics.Rect [ID=0x12ffd980]|   mFeatureID = -1|   mFrameOffsets = androID.graphics.Rect [ID=0x12ffd9e0]|   mFramepadding = androID.graphics.Rect [ID=0x12ffd9c0]|   mHIDeInterpolator = androID.vIEw.animation.PathInterpolator [ID=0x12ffdb00]|   mLastBottomInset = 144|   mLastHasBottomStableInset = true|   mLastHastopStableInset = true|   mLastRightInset = 0|   mLasttopInset = 75|   mLastwindowFlags = -2122252032|   mMenuBackground = null|   mNavigationcolorVIEwState = com.androID.internal.policy.impl.PhoneWindow$colorVIEwState [ID=0x12ff2c70]|   mNavigationGuard = null|   mRootScrollY = 0|   mShowActionModePopup = null|   mShowInterpolator = androID.vIEw.animation.PathInterpolator [ID=0x12ffda60]|   mStatuscolorVIEwState = com.androID.internal.policy.impl.PhoneWindow$colorVIEwState [ID=0x12ff2c40]|   mStatusGuard = null|   mWatchingForMenu = false|   this = com.androID.internal.policy.impl.PhoneWindow [ID=0x12db9e00]|   mForeground = null|   mForegroundBoundsChanged = true|   mForegroundG@R_301_6610@ty = 119|   mForegroundInpadding = true|   mForegroundpaddingBottom = 0|   mForegroundpaddingleft = 0|   mForegroundpaddingRight = 0|   mForegroundpaddingtop = 0|   mForegroundTintList = null|   mForegroundTintMode = null|   mHasForegroundTint = false|   mHasForegroundTintMode = false|   mMatchParentChildren = java.util.ArrayList [ID=0x12ffd960]|   mMeasureAllChildren = false|   mOverlayBounds = androID.graphics.Rect [ID=0x12ffd940]|   mSelfBounds = androID.graphics.Rect [ID=0x12ffd920]|   mAnimationListener = null|   mCachePaint = null|   mChildAcceptsDrag = false|   mChildCountWithTransIEntState = 0|   mChildtransformation = null|   mChildren = androID.vIEw.VIEw[] [ID=0x130064c0;length=12]|   mChildrenCount = 3|   mCurrentDrag = null|   mCurrentDragVIEw = null|   mdisappearingChildren = null|   mDragNotifIEdChildren = null|   mFirstHoverTarget = null|   mFirsttouchTarget = null|   mFocused = androID.Widget.linearLayout [ID=0x12eac800]|   mGroupFlags = 2375763|   mHoveredSelf = false|   mInvalIDateRegion = null|   mInvalIDationtransformation = null|   mLasttouchDownIndex = 0|   mLasttouchDownTime = 137539724|   mLasttouchDownX = 605.0|   mLasttouchDownY = 1177.0|   mLayoutAnimationController = null|   mLayoutCalleDWhileSuppressed = false|   mLayoutMode = 0|   mLayoutTransitionListener = androID.vIEw.VIEwGroup [ID=0x12fdd850]|   mLocalPoint = null|   mnestedScrollAxes = 0|   mOnHIErarchychangelistener = null|   mPersistentDrawingCache = 2|   mPreSortedChildren = null|   mSuppressLayout = false|   mTempPoint = float[] [ID=0x12c0a220;length=2;size=24]|   mTransition = null|   mTransitioningVIEws = null|   mVisibilityChangingChildren = null|   mAccessibilityCursorposition = -1|   mAccessibilityDelegate = null|   mAccessibilityTraversalAfterID = -1|   mAccessibilityTraversalBeforeID = -1|   mAccessibilityVIEwID = -1|   mAnimator = null|   mAttachInfo = androID.vIEw.VIEw$AttachInfo [ID=0x12c4fcc0]|   mAttributes = null|   mBackground = androID.graphics.drawable.colorDrawable [ID=0x13014f80]|   mBackgroundRenderNode = androID.vIEw.RenderNode [ID=0x12c73740]|   mBackgroundResource = 0|   mBackgroundSizeChanged = false|   mBackgroundTint = null|   mBottom = 1920|   mCachingFailed = false|   mClipBounds = null|   mContentDescription = null|   mContext = com.couchsurfing.mobile.ui.MainActivity [ID=0x12db9c80]|   mCurrentAnimation = null|   mDrawableState = null|   mDrawingCache = null|   mDrawingCacheBackgroundcolor = 0|   mfloatingTreeObserver = null|   mGhostVIEw = null|   mHasPerformedLongPress = false|   mID = -1|   minputEventConsistencyVerifIEr = null|   mKeyedTags = null|   mLabelForID = -1|   mLastIsOpaque = true|   mLayerPaint = null|   mLayerType = 0|   mLayoutInsets = null|   mLayoutParams = androID.vIEw.WindowManager$LayoutParams [ID=0x12f1f7e0]|   mleft = 0|   mleftpaddingdefined = true|   mListenerInfo = androID.vIEw.VIEw$ListenerInfo [ID=0x13109940]|   mMatchIDPredicate = null|   mMatchLabelForPredicate = null|   mMeasureCache = androID.util.LongSparseLongArray [ID=0x13400120]|   mMeasuredHeight = 1920|   mMeasureDWIDth = 1080|   mMinHeight = 0|   mMinWIDth = 0|   mnestedScrollingParent = null|   mNextFocusDownID = -1|   mNextFocusForwardID = -1|   mNextFocusleftID = -1|   mNextFocusRightID = -1|   mNextFocusUpID = -1|   moldHeightmeasureSpec = 1073743744|   molDWIDthMeasureSpec = 1073742904|   mOutlineProvIDer = androID.vIEw.VIEwOutlineProvIDer [ID=0x6fcd7240]|   mOverScrollMode = 1|   mOverlay = null|   mpaddingBottom = 0|   mpaddingleft = 0|   mpaddingRight = 0|   mpaddingtop = 0|   mParent = androID.vIEw.VIEwRootImpl [ID=0x13313400]|   mPendingCheckForLongPress = null|   mPendingCheckForTap = null|   mPerformClick = null|   mPrivateFlags = 25201976|   mPrivateFlags2 = 1611867680|   mPrivateFlags3 = 4|   mRecreatedisplayList = false|   mRenderNode = androID.vIEw.RenderNode [ID=0x12ffd880]|   mResources = androID.content.res.Resources [ID=0x12c078e0]|   mRight = 1080|   mRightpaddingdefined = true|   mScrollCache = null|   mScrollX = 0|   mScrollY = 0|   mSendVIEwScrolledAccessibilityEvent = null|   mSendVIEwStateChangedAccessibilityEvent = null|   mSendingHoverAccessibilityEvents = false|   mStateListAnimator = null|   msystemUIVisibility = 0|   mTag = null|   mTempnestedScrollConsumed = null|   mtop = 0|   mtouchDelegate = null|   mtouchSlop = 24|   mtransformationInfo = androID.vIEw.VIEw$transformationInfo [ID=0x1349e7c0]|   mTransIEntStateCount = 0|   mTransitionname = null|   mUnscaledDrawingCache = null|   mUnsetpressedState = null|   mUserpaddingBottom = 0|   mUserpaddingEnd = -2147483648|   mUserpaddingleft = 0|   mUserpaddingLeftinitial = 0|   mUserpaddingRight = 0|   mUserpaddingRightinitial = 0|   mUserpaddingStart = -2147483648|   mVerticalScrollFactor = 0.0|   mVerticalScrollbarposition = 0|   mVIEwFlags = 402655360|   mWindowAttachCount = 1* Instance of androID.vIEw.VIEw$AttachInfo|   mAccessibilityFetchFlags = 0|   mAccessibilityFocusDrawable = null|   mAccessibilityWindowID = 2147483647|   mApplicationScale = 1.0|   mCanvas = null|   mContentInsets = androID.graphics.Rect [ID=0x13364ee0]|   mDeBUGLayout = false|   mDisabledsystemUIVisibility = 0|   mdisplay = androID.vIEw.display [ID=0x12f75b50]|   mdisplayState = 2|   mDrawingTime = 137551407|   mForceReportNewAttributes = false|   mGivenInternalinsets = androID.vIEw.VIEwTreeObserver$InternalinsetsInfo [ID=0x13364f40]|   mGlobalsystemUIVisibility = 0|   mHandler = androID.vIEw.VIEwRootImpl$VIEwRootHandler [ID=0x13364d00]|   mHarDWareAccelerated = true|   mHarDWareaccelerationRequested = true|   mHarDWareRenderer = androID.vIEw.ThreadedRenderer [ID=0x13323dc0]|   mHasNonEmptyGivenInternalinsets = false|   mHassystemUIListeners = true|   mHasWindowFocus = true|   mHighContrastText = false|   mIWindowID = null|   mIgnoreDirtyState = false|   mIntouchMode = true|   mInvalIDateChildLocation = int[] [ID=0x13370060;length=2;size=24]|   mKeepScreenOn = false|   mKeydispatchState = androID.vIEw.KeyEvent$dispatcherState [ID=0x13364fc0]|   mOverscanInsets = androID.graphics.Rect [ID=0x13364ec0]|   mOverscanRequested = false|   mPanelParentwindowToken = null|   mPendingAnimatingRenderNodes = null|   mPoint = androID.graphics.Point [ID=0x133582f0]|   mRecomputeGlobalAttributes = false|   mRootCallbacks = androID.vIEw.VIEwRootImpl [ID=0x13313400]|   mRootVIEw = com.androID.internal.policy.impl.PhoneWindow$DecorVIEw [ID=0x12eac000]|   mScalingrequired = false|   mScrollContainers = java.util.ArrayList [ID=0x13364fa0]|   mSession = androID.vIEw.Iwindowsession$Stub$Proxy [ID=0x13358290]|   mSetIgnoreDirtyState = true|   mStableInsets = androID.graphics.Rect [ID=0x13364f20]|   msystemUIVisibility = 0|   mTempArrayList = java.util.ArrayList [ID=0x133701a0]|   mTmpInvalRect = androID.graphics.Rect [ID=0x133700c0]|   mTmpLocation = int[] [ID=0x13370080;length=2;size=24]|   mTmpMatrix = androID.graphics.Matrix [ID=0x133582d0]|   mTmpOutline = androID.graphics.Outline [ID=0x13370180]|   mTmpRectList = java.util.ArrayList [ID=0x13370120]|   mTmptransformLocation = float[] [ID=0x133700a0;length=2;size=24]|   mTmptransformRect = androID.graphics.RectF [ID=0x133700e0]|   mTmptransformRect1 = androID.graphics.RectF [ID=0x13370100]|   mTmptransformation = androID.vIEw.animation.transformation [ID=0x13370140]|   mtransparentLocation = int[] [ID=0x13370040;length=2;size=24]|   mTreeObserver = androID.vIEw.VIEwTreeObserver [ID=0x133656c0]|   mTurnOffWindowResizeAnim = false|   mUnbuffereddispatchRequested = false|   mUse32BitDrawingCache = true|   mVIEwRequestingLayout = null|   mVIEwRootImpl = androID.vIEw.VIEwRootImpl [ID=0x13313400]|   mVIEwScrollChanged = false|   mVIEwVisibilityChanged = false|   mVisibleInsets = androID.graphics.Rect [ID=0x13364f00]|   mWindow = androID.vIEw.VIEwRootImpl$W [ID=0x13364e80]|   mWindowID = null|   mWindowleft = 0|   mWindowToken = androID.vIEw.VIEwRootImpl$W [ID=0x13364e80]|   mWindowtop = 0|   mWindowVisibility = 0* Instance of androID.vIEw.VIEwTreeObserver|   mAlive = true|   mOnComputeInternalinsetsListeners = null|   mOnDrawListeners = null|   mOnEnteranimationCompleteListeners = null|   mOnGlobalFocusListeners = null|   mOnGlobalLayoutListeners = androID.vIEw.VIEwTreeObserver$copyOnWriteArray [ID=0x1315a300]|   mOnPreDrawListeners = androID.vIEw.VIEwTreeObserver$copyOnWriteArray [ID=0x13345760]|   mOnScrollChangedListeners = androID.vIEw.VIEwTreeObserver$copyOnWriteArray [ID=0x12fd3220]|   mOntouchModechangelisteners = java.util.concurrent.copyOnWriteArrayList [ID=0x133a1420]|   mOnWindowAttachListeners = null|   mOnWindowFocusListeners = null|   mOnwindowshownListeners = null|   mwindowshown = false* Instance of androID.vIEw.VIEwTreeObserver$copyOnWriteArray|   mAccess = androID.vIEw.VIEwTreeObserver$copyOnWriteArray$Access [ID=0x12fa1960]|   mData = java.util.ArrayList [ID=0x12fd3240]|   mDatacopy = null|   mStart = false* Instance of java.util.ArrayList|   static $staticOverhead = byte[] [ID=0x6fcffb29;length=16;size=32]|   static MIN_CAPACITY_INCREMENT = 12|   static serialVersionUID = 8683452581122892189|   array = java.lang.Object[] [ID=0x13094a40;length=12]|   size = 1|   modCount = 1* Array of java.lang.Object[]|   [0] = com.couchsurfing.mobile.ui.events.detail.EventDetailsVIEw [ID=0x12fa1950]|   [1] = null|   [2] = null|   [3] = null|   [4] = null|   [5] = null|   [6] = null|   [7] = null|   [8] = null|   [9] = null|   [10] = null|   [

解决方法 在VIEw实际从窗口中分离之前,尝试更改删除侦听器的代码,如下所示：

原因是,在从窗口分离后,getVIEwTreeObserver()返回一个不同的实例(“浮动树观察者”),因此您不会从添加它的同一对象中删除您的侦听器.

UPDATE

由于您正在使用子视图的VIEwTreeObserver,因此行为稍微复杂一点,一种可能的解决方案是将onAttachStatechangelistener添加到scrollVIEw并从那里添加/删除OnScrollChangedListener.

无论如何,有关泄漏的原因：getVIEwTreeObserver()在VIEw从窗口中分离后不会返回相同的实例.调用removeOnScrollChangedListener()可能无效,使原始的OnScrollChangedListener仍然附加到旧的VIEwTreeObserver,从而泄露了Context.

总结

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