RecyclerView.LayoutManager

Nested classes
`interface`	`RecyclerView.LayoutManager.LayoutPrefetchRegistry` Interface for LayoutManagers to request items to be prefetched, based on position, with specified distance from viewport, which indicates priority.
`class`	`RecyclerView.LayoutManager.Properties` Some general properties that a LayoutManager may want to use.

XML attributes
`RecyclerView_android_orientation`
`RecyclerView_reverseLayout`
`RecyclerView_spanCount`
`RecyclerView_stackFromEnd`

Public constructors
`RecyclerView.LayoutManager()`

Public methods
`void`	`addDisappearingView(View child, int index)` To be called only during `onLayoutChildren(Recycler, State)` to add a view to the layout that is known to be going away, either because it has been `removed` or because it is actually not in the visible portion of the container but is being laid out in order to inform RecyclerView in how to animate the item out of view.
`void`	`addDisappearingView(View child)` To be called only during `onLayoutChildren(Recycler, State)` to add a view to the layout that is known to be going away, either because it has been `removed` or because it is actually not in the visible portion of the container but is being laid out in order to inform RecyclerView in how to animate the item out of view.
`void`	`addView(View child, int index)` Add a view to the currently attached RecyclerView if needed.
`void`	`addView(View child)` Add a view to the currently attached RecyclerView if needed.
`void`	`assertInLayoutOrScroll(String message)` Checks if RecyclerView is in the middle of a layout or scroll and throws an `IllegalStateException` if it is not.
`void`	`assertNotInLayoutOrScroll(String message)` Checks if RecyclerView is in the middle of a layout or scroll and throws an `IllegalStateException` if it is.
`void`	`attachView(View child)` Reattach a previously `detached` view.
`void`	`attachView(View child, int index)` Reattach a previously `detached` view.
`void`	`attachView(View child, int index, RecyclerView.LayoutParams lp)` Reattach a previously `detached` view.
`void`	`calculateItemDecorationsForChild(View child, Rect outRect)` Calculates the item decor insets applied to the given child and updates the provided Rect instance with the inset values.
`boolean`	`canScrollHorizontally()` Query if horizontal scrolling is currently supported.
`boolean`	`canScrollVertically()` Query if vertical scrolling is currently supported.
`boolean`	`checkLayoutParams(RecyclerView.LayoutParams lp)` Determines the validity of the supplied LayoutParams object.
`static int`	`chooseSize(int spec, int desired, int min)` Chooses a size from the given specs and parameters that is closest to the desired size and also complies with the spec.
`void`	`collectAdjacentPrefetchPositions(int dx, int dy, RecyclerView.State state, RecyclerView.LayoutManager.LayoutPrefetchRegistry layoutPrefetchRegistry)` Gather all positions from the LayoutManager to be prefetched, given specified momentum.
`void`	`collectInitialPrefetchPositions(int adapterItemCount, RecyclerView.LayoutManager.LayoutPrefetchRegistry layoutPrefetchRegistry)` Gather all positions from the LayoutManager to be prefetched in preperation for its RecyclerView to come on screen, due to the movement of another, containing RecyclerView.
`int`	`computeHorizontalScrollExtent(RecyclerView.State state)` Override this method if you want to support scroll bars.
`int`	`computeHorizontalScrollOffset(RecyclerView.State state)` Override this method if you want to support scroll bars.
`int`	`computeHorizontalScrollRange(RecyclerView.State state)` Override this method if you want to support scroll bars.
`int`	`computeVerticalScrollExtent(RecyclerView.State state)` Override this method if you want to support scroll bars.
`int`	`computeVerticalScrollOffset(RecyclerView.State state)` Override this method if you want to support scroll bars.
`int`	`computeVerticalScrollRange(RecyclerView.State state)` Override this method if you want to support scroll bars.
`void`	`detachAndScrapAttachedViews(RecyclerView.Recycler recycler)` Temporarily detach and scrap all currently attached child views.
`void`	`detachAndScrapView(View child, RecyclerView.Recycler recycler)` Detach a child view and add it to a `Recycler's` scrap heap.
`void`	`detachAndScrapViewAt(int index, RecyclerView.Recycler recycler)` Detach a child view and add it to a `Recycler's` scrap heap.
`void`	`detachView(View child)` Temporarily detach a child view.
`void`	`detachViewAt(int index)` Temporarily detach a child view.
`void`	`endAnimation(View view)` Ends all animations on the view created by the `RecyclerView.ItemAnimator`.
`View`	`findContainingItemView(View view)` Traverses the ancestors of the given view and returns the item view that contains it and also a direct child of the LayoutManager.
`View`	`findViewByPosition(int position)` Finds the view which represents the given adapter position.
`abstract RecyclerView.LayoutParams`	`generateDefaultLayoutParams()` Create a default `LayoutParams` object for a child of the RecyclerView.
`RecyclerView.LayoutParams`	`generateLayoutParams(Context c, AttributeSet attrs)` Create a LayoutParams object suitable for this LayoutManager from an inflated layout resource.
`RecyclerView.LayoutParams`	`generateLayoutParams(ViewGroup.LayoutParams lp)` Create a LayoutParams object suitable for this LayoutManager, copying relevant values from the supplied LayoutParams object if possible.
`int`	`getBaseline()` Returns offset of the RecyclerView's text baseline from the its top boundary.
`int`	`getBottomDecorationHeight(View child)` Returns the total height of item decorations applied to child's bottom.
`View`	`getChildAt(int index)` Return the child view at the given index
`int`	`getChildCount()` Return the current number of child views attached to the parent RecyclerView.
`static int`	`getChildMeasureSpec(int parentSize, int parentMode, int padding, int childDimension, boolean canScroll)` Calculate a MeasureSpec value for measuring a child view in one dimension.
`static int`	`getChildMeasureSpec(int parentSize, int padding, int childDimension, boolean canScroll)` This method was deprecated in API level 24.1.0. use `getChildMeasureSpec(int, int, int, int, boolean)`
`boolean`	`getClipToPadding()` Check if the RecyclerView is configured to clip child views to its padding.
`int`	`getColumnCountForAccessibility(RecyclerView.Recycler recycler, RecyclerView.State state)` Returns the number of columns for accessibility.
`int`	`getDecoratedBottom(View child)` Returns the bottom edge of the given child view within its parent, offset by any applied `ItemDecorations`.
`void`	`getDecoratedBoundsWithMargins(View view, Rect outBounds)` Returns the bounds of the view including its decoration and margins.
`int`	`getDecoratedLeft(View child)` Returns the left edge of the given child view within its parent, offset by any applied `ItemDecorations`.
`int`	`getDecoratedMeasuredHeight(View child)` Returns the measured height of the given child, plus the additional size of any insets applied by `ItemDecorations`.
`int`	`getDecoratedMeasuredWidth(View child)` Returns the measured width of the given child, plus the additional size of any insets applied by `ItemDecorations`.
`int`	`getDecoratedRight(View child)` Returns the right edge of the given child view within its parent, offset by any applied `ItemDecorations`.
`int`	`getDecoratedTop(View child)` Returns the top edge of the given child view within its parent, offset by any applied `ItemDecorations`.
`View`	`getFocusedChild()` Returns the item View which has or contains focus.
`int`	`getHeight()` Returns the height that is currently relevant to the LayoutManager.
`int`	`getHeightMode()` Return the height measurement spec mode that is currently relevant to the LayoutManager.
`int`	`getItemCount()` Returns the number of items in the adapter bound to the parent RecyclerView.
`int`	`getItemViewType(View view)` Returns the View type defined by the adapter.
`int`	`getLayoutDirection()` Returns the resolved layout direction for this RecyclerView.
`int`	`getLeftDecorationWidth(View child)` Returns the total width of item decorations applied to child's left.
`int`	`getMinimumHeight()`
`int`	`getMinimumWidth()`
`int`	`getPaddingBottom()` Return the bottom padding of the parent RecyclerView
`int`	`getPaddingEnd()` Return the end padding of the parent RecyclerView
`int`	`getPaddingLeft()` Return the left padding of the parent RecyclerView
`int`	`getPaddingRight()` Return the right padding of the parent RecyclerView
`int`	`getPaddingStart()` Return the start padding of the parent RecyclerView
`int`	`getPaddingTop()` Return the top padding of the parent RecyclerView
`int`	`getPosition(View view)` Returns the adapter position of the item represented by the given View.
`static RecyclerView.LayoutManager.Properties`	`getProperties(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)` Parse the xml attributes to get the most common properties used by layout managers.
`int`	`getRightDecorationWidth(View child)` Returns the total width of item decorations applied to child's right.
`int`	`getRowCountForAccessibility(RecyclerView.Recycler recycler, RecyclerView.State state)` Returns the number of rows for accessibility.
`int`	`getSelectionModeForAccessibility(RecyclerView.Recycler recycler, RecyclerView.State state)` Returns the selection mode for accessibility.
`int`	`getTopDecorationHeight(View child)` Returns the total height of item decorations applied to child's top.
`void`	`getTransformedBoundingBox(View child, boolean includeDecorInsets, Rect out)` Calculates the bounding box of the View while taking into account its matrix changes (translation, scale etc) with respect to the RecyclerView.
`int`	`getWidth()` Returns the width that is currently relevant to the LayoutManager.
`int`	`getWidthMode()` Return the width measurement spec mode that is currently relevant to the LayoutManager.
`boolean`	`hasFocus()` Returns true if the RecyclerView this LayoutManager is bound to has or contains focus.
`void`	`ignoreView(View view)` Flags a view so that it will not be scrapped or recycled.
`boolean`	`isAttachedToWindow()` Returns whether LayoutManager is currently attached to a RecyclerView which is attached to a window.
`boolean`	`isAutoMeasureEnabled()` Returns whether the measuring pass of layout should use the AutoMeasure mechanism of `RecyclerView` or if it should be done by the LayoutManager's implementation of `onMeasure(Recycler, State, int, int)`.
`boolean`	`isFocused()` Returns true if the RecyclerView this LayoutManager is bound to has focus.
`final boolean`	`isItemPrefetchEnabled()` Sets whether the LayoutManager should be queried for views outside of its viewport while the UI thread is idle between frames.
`boolean`	`isLayoutHierarchical(RecyclerView.Recycler recycler, RecyclerView.State state)` Returns whether layout is hierarchical or not to be used for accessibility.
`boolean`	`isMeasurementCacheEnabled()` In addition to the View Framework's measurement cache, RecyclerView uses its own additional measurement cache for its children to avoid re-measuring them when not necessary.
`boolean`	`isSmoothScrolling()`
`boolean`	`isViewPartiallyVisible(View child, boolean completelyVisible, boolean acceptEndPointInclusion)` Returns whether the given child view is partially or fully visible within the padded bounded area of RecyclerView, depending on the input parameters.
`void`	`layoutDecorated(View child, int left, int top, int right, int bottom)` Lay out the given child view within the RecyclerView using coordinates that include any current `ItemDecorations`.
`void`	`layoutDecoratedWithMargins(View child, int left, int top, int right, int bottom)` Lay out the given child view within the RecyclerView using coordinates that include any current `ItemDecorations` and margins.
`void`	`measureChild(View child, int widthUsed, int heightUsed)` Measure a child view using standard measurement policy, taking the padding of the parent RecyclerView and any added item decorations into account.
`void`	`measureChildWithMargins(View child, int widthUsed, int heightUsed)` Measure a child view using standard measurement policy, taking the padding of the parent RecyclerView, any added item decorations and the child margins into account.
`void`	`moveView(int fromIndex, int toIndex)` Moves a View from one position to another.
`void`	`offsetChildrenHorizontal(int dx)` Offset all child views attached to the parent RecyclerView by dx pixels along the horizontal axis.
`void`	`offsetChildrenVertical(int dy)` Offset all child views attached to the parent RecyclerView by dy pixels along the vertical axis.
`void`	`onAdapterChanged(Adapter oldAdapter, Adapter newAdapter)` Called if the RecyclerView this LayoutManager is bound to has a different adapter set via `setAdapter(Adapter)` or `swapAdapter(Adapter, boolean)`.
`boolean`	`onAddFocusables(RecyclerView recyclerView, ArrayList<View> views, int direction, int focusableMode)` Called to populate focusable views within the RecyclerView.
`void`	`onAttachedToWindow(RecyclerView view)` Called when this LayoutManager is both attached to a RecyclerView and that RecyclerView is attached to a window.
`void`	`onDetachedFromWindow(RecyclerView view, RecyclerView.Recycler recycler)` Called when this LayoutManager is detached from its parent RecyclerView or when its parent RecyclerView is detached from its window.
`void`	`onDetachedFromWindow(RecyclerView view)` This method was deprecated in API level 22.1.0. override `onDetachedFromWindow(RecyclerView, Recycler)`
`View`	`onFocusSearchFailed(View focused, int direction, RecyclerView.Recycler recycler, RecyclerView.State state)` Called when searching for a focusable view in the given direction has failed for the current content of the RecyclerView.
`void`	`onInitializeAccessibilityEvent(AccessibilityEvent event)`
`void`	`onInitializeAccessibilityEvent(RecyclerView.Recycler recycler, RecyclerView.State state, AccessibilityEvent event)` Called by the accessibility delegate to initialize an accessibility event.


      addDisappearingView(View child, int index)

To be called only during onLayoutChildren(Recycler, State) to add a view to the layout that is known to be going away, either because it has been removed or because it is actually not in the visible portion of the container but is being laid out in order to inform RecyclerView in how to animate the item out of view.


      addDisappearingView(View child)

To be called only during onLayoutChildren(Recycler, State) to add a view to the layout that is known to be going away, either because it has been removed or because it is actually not in the visible portion of the container but is being laid out in order to inform RecyclerView in how to animate the item out of view.


      addView(View child, int index)

Add a view to the currently attached RecyclerView if needed.


      addView(View child)

Add a view to the currently attached RecyclerView if needed.


      assertInLayoutOrScroll(String message)

Checks if RecyclerView is in the middle of a layout or scroll and throws an IllegalStateException if it is not.


      assertNotInLayoutOrScroll(String message)

Checks if RecyclerView is in the middle of a layout or scroll and throws an IllegalStateException if it is.


      attachView(View child)

Reattach a previously detached view.


      attachView(View child, int index)

Reattach a previously detached view.


      attachView(View child, int index, RecyclerView.LayoutParams lp)

Reattach a previously detached view.


      calculateItemDecorationsForChild(View child, Rect outRect)

Calculates the item decor insets applied to the given child and updates the provided Rect instance with the inset values.


      canScrollHorizontally()

Query if horizontal scrolling is currently supported.


      canScrollVertically()

Query if vertical scrolling is currently supported.


      checkLayoutParams(RecyclerView.LayoutParams lp)

Determines the validity of the supplied LayoutParams object.


      chooseSize(int spec, int desired, int min)

Chooses a size from the given specs and parameters that is closest to the desired size and also complies with the spec.


      collectAdjacentPrefetchPositions(int dx, int dy, RecyclerView.State state, RecyclerView.LayoutManager.LayoutPrefetchRegistry layoutPrefetchRegistry)

Gather all positions from the LayoutManager to be prefetched, given specified momentum.


      collectInitialPrefetchPositions(int adapterItemCount, RecyclerView.LayoutManager.LayoutPrefetchRegistry layoutPrefetchRegistry)

Gather all positions from the LayoutManager to be prefetched in preperation for its RecyclerView to come on screen, due to the movement of another, containing RecyclerView.

int


      computeHorizontalScrollExtent(RecyclerView.State state)