GridLayoutManager

Kotlin |Java

open class GridLayoutManager : LinearLayoutManager

kotlin.Any
↳	androidx.recyclerview.widget.RecyclerView.LayoutManager
	↳	androidx.recyclerview.widget.LinearLayoutManager
		↳	androidx.recyclerview.widget.GridLayoutManager

A RecyclerView.LayoutManager implementations that lays out items in a grid.

By default, each item occupies 1 span. You can change it by providing a custom SpanSizeLookup instance via setSpanSizeLookup(SpanSizeLookup).

Summary

Nested classes
	`DefaultSpanSizeLookup` Default implementation for `SpanSizeLookup`.
open	`LayoutParams` LayoutParams used by GridLayoutManager.
abstract	`SpanSizeLookup` A helper class to provide the number of spans each item occupies.

Constants
static Int	`DEFAULT_SPAN_COUNT`

Inherited constants

From class LinearLayoutManager

`Int`	`HORIZONTAL`
`Int`	`INVALID_OFFSET`
`Int`	`VERTICAL`

Public constructors
`<init>(context: Context!, attrs: AttributeSet!, defStyleAttr: Int, defStyleRes: Int)` Constructor used when layout manager is set in XML by RecyclerView attribute "layoutManager".
`<init>(context: Context!, spanCount: Int)` Creates a vertical GridLayoutManager
`<init>(context: Context!, spanCount: Int, orientation: Int, reverseLayout: Boolean)`

Public methods
open Boolean	`checkLayoutParams(lp: RecyclerView.LayoutParams!)`
open Int	`computeHorizontalScrollOffset(state: RecyclerView.State)`
open Int	`computeHorizontalScrollRange(state: RecyclerView.State)`
open Int	`computeVerticalScrollOffset(state: RecyclerView.State)`
open Int	`computeVerticalScrollRange(state: RecyclerView.State)`
open RecyclerView.LayoutParams!	`generateDefaultLayoutParams()`
open RecyclerView.LayoutParams!	`generateLayoutParams(c: Context!, attrs: AttributeSet!)`
open RecyclerView.LayoutParams!	`generateLayoutParams(lp: LayoutParams!)`
open Int	`getColumnCountForAccessibility(recycler: RecyclerView.Recycler, state: RecyclerView.State)`
open Int	`getRowCountForAccessibility(recycler: RecyclerView.Recycler, state: RecyclerView.State)`
open Int	`getSpanCount()` Returns the number of spans laid out by this grid.
open GridLayoutManager.SpanSizeLookup!	`getSpanSizeLookup()` Returns the current `SpanSizeLookup` used by the GridLayoutManager.
open Boolean	`isUsingSpansToEstimateScrollbarDimensions()` Returns true if the scroll offset and scroll range calculations take account of span information.
open View?	`onFocusSearchFailed(focused: View, focusDirection: Int, recycler: RecyclerView.Recycler, state: RecyclerView.State)`
open Unit	`onInitializeAccessibilityNodeInfoForItem(recycler: RecyclerView.Recycler, state: RecyclerView.State, host: View, info: AccessibilityNodeInfoCompat)`
open Unit	`onItemsAdded(recyclerView: RecyclerView, positionStart: Int, itemCount: Int)`
open Unit	`onItemsChanged(recyclerView: RecyclerView)`
open Unit	`onItemsMoved(recyclerView: RecyclerView, from: Int, to: Int, itemCount: Int)`
open Unit	`onItemsRemoved(recyclerView: RecyclerView, positionStart: Int, itemCount: Int)`
open Unit	`onItemsUpdated(recyclerView: RecyclerView, positionStart: Int, itemCount: Int, payload: Any?)`
open Unit	`onLayoutChildren(recycler: RecyclerView.Recycler!, state: RecyclerView.State!)`
open Unit	`onLayoutCompleted(state: RecyclerView.State!)`
open Int	`scrollHorizontallyBy(dx: Int, recycler: RecyclerView.Recycler!, state: RecyclerView.State!)`
open Int	`scrollVerticallyBy(dy: Int, recycler: RecyclerView.Recycler!, state: RecyclerView.State!)`
open Unit	`setMeasuredDimension(childrenBounds: Rect!, wSpec: Int, hSpec: Int)`
open Unit	`setSpanCount(spanCount: Int)` Sets the number of spans to be laid out.
open Unit	`setSpanSizeLookup(spanSizeLookup: GridLayoutManager.SpanSizeLookup!)` Sets the source to get the number of spans occupied by each item in the adapter.
open Unit	`setStackFromEnd(stackFromEnd: Boolean)` stackFromEnd is not supported by GridLayoutManager.
open Unit	`setUsingSpansToEstimateScrollbarDimensions(useSpansToEstimateScrollBarDimensions: Boolean)` When this flag is set, the scroll offset and scroll range calculations will take account of span information.
open Boolean	`supportsPredictiveItemAnimations()`

Inherited functions

From class LayoutManager

`Unit`	`addDisappearingView(child: View!)` 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. Views added via this method are going to be invisible to LayoutManager after the dispatchLayout pass is complete. They cannot be retrieved via `getChildAt(int)` or won't be included in `getChildCount()` method.
`Unit`	`addDisappearingView(child: View!, index: Int)` 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. Views added via this method are going to be invisible to LayoutManager after the dispatchLayout pass is complete. They cannot be retrieved via `getChildAt(int)` or won't be included in `getChildCount()` method.
`Unit`	`addView(child: View!)` Add a view to the currently attached RecyclerView if needed. LayoutManagers should use this method to add views obtained from a `Recycler` using `Recycler#getViewForPosition(int)`.
`Unit`	`addView(child: View!, index: Int)` Add a view to the currently attached RecyclerView if needed. LayoutManagers should use this method to add views obtained from a `Recycler` using `Recycler#getViewForPosition(int)`.
`Unit`	`assertInLayoutOrScroll(message: String!)` Checks if RecyclerView is in the middle of a layout or scroll and throws an `IllegalStateException` if it is not.
`Unit`	`attachView(@NonNull child: View, index: Int, lp: RecyclerView.LayoutParams!)` Reattach a previously `detached` view. This method should not be used to reattach views that were previously `detachAndScrapView(android.view.View, RecyclerView.Recycler)` scrapped}.
`Unit`	`attachView(@NonNull child: View, index: Int)` Reattach a previously `detached` view. This method should not be used to reattach views that were previously `detachAndScrapView(android.view.View, RecyclerView.Recycler)` scrapped}.
`Unit`	`attachView(@NonNull child: View)` Reattach a previously `detached` view. This method should not be used to reattach views that were previously `detachAndScrapView(android.view.View, RecyclerView.Recycler)` scrapped}.
`Unit`	`calculateItemDecorationsForChild(@NonNull child: View, @NonNull outRect: Rect)` Calculates the item decor insets applied to the given child and updates the provided Rect instance with the inset values. The Rect's left is set to the total width of left decorations. The Rect's top is set to the total height of top decorations. The Rect's right is set to the total width of right decorations. The Rect's bottom is set to total height of bottom decorations. Note that item decorations are automatically calculated when one of the LayoutManager's measure child methods is called. If you need to measure the child with custom specs via `View#measure(int, int)`, you can use this method to get decorations.
`Boolean`	`checkLayoutParams(lp: RecyclerView.LayoutParams!)` Determines the validity of the supplied LayoutParams object. This should check to make sure that the object is of the correct type and all values are within acceptable ranges. The default implementation returns `true` for non-null params.
`Int`	`chooseSize(spec: Int, desired: Int, min: Int)` Chooses a size from the given specs and parameters that is closest to the desired size and also complies with the spec.
`Unit`	`detachAndScrapAttachedViews(@NonNull recycler: RecyclerView.Recycler)` Temporarily detach and scrap all currently attached child views. Views will be scrapped into the given Recycler. The Recycler may prefer to reuse scrap views before other views that were previously recycled.
`Unit`	`detachAndScrapView(@NonNull child: View, @NonNull recycler: RecyclerView.Recycler)` Detach a child view and add it to a `Recycler's` scrap heap. Scrapping a view allows it to be rebound and reused to show updated or different data.
`Unit`	`detachAndScrapViewAt(index: Int, @NonNull recycler: RecyclerView.Recycler)` Detach a child view and add it to a `Recycler's` scrap heap. Scrapping a view allows it to be rebound and reused to show updated or different data.
`Unit`	`detachView(@NonNull child: View)` Temporarily detach a child view. LayoutManagers may want to perform a lightweight detach operation to rearrange views currently attached to the RecyclerView. Generally LayoutManager implementations will want to use `detachAndScrapView(android.view.View, RecyclerView.Recycler)` so that the detached view may be rebound and reused. If a LayoutManager uses this method to detach a view, it must `reattach` or `fully remove` the detached view before the LayoutManager entry point method called by RecyclerView returns.
`Unit`	`detachViewAt(index: Int)` Temporarily detach a child view. LayoutManagers may want to perform a lightweight detach operation to rearrange views currently attached to the RecyclerView. Generally LayoutManager implementations will want to use `detachAndScrapView(android.view.View, RecyclerView.Recycler)` so that the detached view may be rebound and reused. If a LayoutManager uses this method to detach a view, it must `reattach` or `fully remove` the detached view before the LayoutManager entry point method called by RecyclerView returns.
`Unit`	`endAnimation(view: View!)` Ends all animations on the view created by the `ItemAnimator`.
`View?`	`findContainingItemView(@NonNull 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. Note that this method may return null if the view is a child of the RecyclerView but not a child of the LayoutManager (e.g. running a disappear animation).
`RecyclerView.LayoutParams!`	`generateLayoutParams(lp: LayoutParams!)` Create a LayoutParams object suitable for this LayoutManager, copying relevant values from the supplied LayoutParams object if possible. Important: if you use your own custom `LayoutParams` type you must also override `checkLayoutParams(LayoutParams)`, `generateLayoutParams(android.view.ViewGroup.LayoutParams)` and `generateLayoutParams(android.content.Context, android.util.AttributeSet)`.
`RecyclerView.LayoutParams!`	`generateLayoutParams(c: Context!, attrs: AttributeSet!)` Create a LayoutParams object suitable for this LayoutManager from an inflated layout resource. Important: if you use your own custom `LayoutParams` type you must also override `checkLayoutParams(LayoutParams)`, `generateLayoutParams(android.view.ViewGroup.LayoutParams)` and `generateLayoutParams(android.content.Context, android.util.AttributeSet)`.
`Int`	`getBaseline()` Returns offset of the RecyclerView's text baseline from the its top boundary.
`Int`	`getBottomDecorationHeight(@NonNull child: View)` Returns the total height of item decorations applied to child's bottom. Note that this value is not updated until the View is measured or `calculateItemDecorationsForChild(View, Rect)` is called.
`View?`	`getChildAt(index: Int)` Return the child view at the given index
`Int`	`getChildCount()` Return the current number of child views attached to the parent RecyclerView. This does not include child views that were temporarily detached and/or scrapped.
`Int`	`getChildMeasureSpec(parentSize: Int, padding: Int, childDimension: Int, canScroll: Boolean)` Calculate a MeasureSpec value for measuring a child view in one dimension.
`Int`	`getChildMeasureSpec(parentSize: Int, parentMode: Int, padding: Int, childDimension: Int, canScroll: Boolean)` Calculate a MeasureSpec value for measuring a child view in one dimension.
`Boolean`	`getClipToPadding()` Check if the RecyclerView is configured to clip child views to its padding.
`Int`	`getColumnCountForAccessibility(@NonNull recycler: RecyclerView.Recycler, @NonNull state: RecyclerView.State)` Returns the number of columns for accessibility. Default implementation returns the number of items in the adapter if LayoutManager supports horizontal scrolling or 1 if LayoutManager does not support horizontal scrolling.
`Int`	`getDecoratedBottom(@NonNull child: View)` Returns the bottom edge of the given child view within its parent, offset by any applied `ItemDecorations`.
`Unit`	`getDecoratedBoundsWithMargins(@NonNull view: View, @NonNull outBounds: Rect)` Returns the bounds of the view including its decoration and margins.
`Int`	`getDecoratedLeft(@NonNull child: View)` Returns the left edge of the given child view within its parent, offset by any applied `ItemDecorations`.
`Int`	`getDecoratedMeasuredHeight(@NonNull child: View)` Returns the measured height of the given child, plus the additional size of any insets applied by `ItemDecorations`.
`Int`	`getDecoratedMeasuredWidth(@NonNull child: View)` Returns the measured width of the given child, plus the additional size of any insets applied by `ItemDecorations`.
`Int`	`getDecoratedRight(@NonNull child: View)` Returns the right edge of the given child view within its parent, offset by any applied `ItemDecorations`.
`Int`	`getDecoratedTop(@NonNull child: View)` 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. This value is usually equal to the laid out height of the `RecyclerView` but may reflect the current `android.view.View.MeasureSpec` height if the `LayoutManager` is using AutoMeasure and the RecyclerView is in the process of measuring. The LayoutManager must always use this method to retrieve the height relevant to it at any given time.
`Int`	`getHeightMode()` Return the height measurement spec mode that is currently relevant to the LayoutManager. This value is set only if the LayoutManager opts into the AutoMeasure api via `setAutoMeasureEnabled(boolean)`. When RecyclerView is running a layout, this value is always set to `View.MeasureSpec#EXACTLY` even if it was measured with a different spec mode.
`Int`	`getItemCount()` Returns the number of items in the adapter bound to the parent RecyclerView. Note that this number is not necessarily equal to `State#getItemCount()`. In methods where `State` is available, you should use `State#getItemCount()` instead. For more details, check the documentation for `State#getItemCount()`.
`Int`	`getItemViewType(@NonNull view: View)` Returns the View type defined by the adapter.
`Int`	`getLayoutDirection()` Returns the resolved layout direction for this RecyclerView.
`Int`	`getLeftDecorationWidth(@NonNull child: View)` Returns the total width of item decorations applied to child's left. Note that this value is not updated until the View is measured or `calculateItemDecorationsForChild(View, Rect)` is called.
`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(@NonNull view: View)` Returns the adapter position of the item represented by the given View. This does not contain any adapter changes that might have happened after the last layout.
`RecyclerView.LayoutManager.Properties!`	`getProperties(@NonNull context: Context, @Nullable attrs: AttributeSet?, defStyleAttr: Int, defStyleRes: Int)` Parse the xml attributes to get the most common properties used by layout managers. `android.R.attr#orientation` androidx.recyclerview.R.attr#spanCount androidx.recyclerview.R.attr#reverseLayout androidx.recyclerview.R.attr#stackFromEnd
`Int`	`getRightDecorationWidth(@NonNull child: View)` Returns the total width of item decorations applied to child's right. Note that this value is not updated until the View is measured or `calculateItemDecorationsForChild(View, Rect)` is called.
`Int`	`getRowCountForAccessibility(@NonNull recycler: RecyclerView.Recycler, @NonNull state: RecyclerView.State)` Returns the number of rows for accessibility. Default implementation returns the number of items in the adapter if LayoutManager supports vertical scrolling or 1 if LayoutManager does not support vertical scrolling.
`Int`	`getSelectionModeForAccessibility(@NonNull recycler: RecyclerView.Recycler, @NonNull state: RecyclerView.State)` Returns the selection mode for accessibility. Should be `AccessibilityNodeInfoCompat.CollectionInfoCompat#SELECTION_MODE_NONE`, `AccessibilityNodeInfoCompat.CollectionInfoCompat#SELECTION_MODE_SINGLE` or `AccessibilityNodeInfoCompat.CollectionInfoCompat#SELECTION_MODE_MULTIPLE`. Default implementation returns `AccessibilityNodeInfoCompat.CollectionInfoCompat#SELECTION_MODE_NONE`.
`Int`	`getTopDecorationHeight(@NonNull child: View)` Returns the total height of item decorations applied to child's top. Note that this value is not updated until the View is measured or `calculateItemDecorationsForChild(View, Rect)` is called.
`Unit`	`getTransformedBoundingBox(@NonNull child: View, includeDecorInsets: Boolean, @NonNull out: Rect)` Calculates the bounding box of the View while taking into account its matrix changes (translation, scale etc) with respect to the RecyclerView. If `includeDecorInsets` is `true`, they are applied first before applying the View's matrix so that the decor offsets also go through the same transformation.
`Int`	`getWidth()` Returns the width that is currently relevant to the LayoutManager. This value is usually equal to the laid out width of the `RecyclerView` but may reflect the current `android.view.View.MeasureSpec` width if the `LayoutManager` is using AutoMeasure and the RecyclerView is in the process of measuring. The LayoutManager must always use this method to retrieve the width relevant to it at any given time.
`Int`	`getWidthMode()` Return the width measurement spec mode that is currently relevant to the LayoutManager. This value is set only if the LayoutManager opts into the AutoMeasure api via `setAutoMeasureEnabled(boolean)`. When RecyclerView is running a layout, this value is always set to `View.MeasureSpec#EXACTLY` even if it was measured with a different spec mode.
`Boolean`	`hasFocus()` Returns true if the RecyclerView this LayoutManager is bound to has or contains focus.
`Unit`	`ignoreView(@NonNull view: View)` Flags a view so that it will not be scrapped or recycled. Scope of ignoring a child is strictly restricted to position tracking, scrapping and recyling. Methods like `removeAndRecycleAllViews(Recycler)` will ignore the child whereas `removeAllViews()` or `offsetChildrenHorizontal(int)` will not ignore the child. Before this child can be recycled again, you have to call `stopIgnoringView(View)`. You can call this method only if your LayoutManger is in onLayout or onScroll callback.
`Boolean`	`isAttachedToWindow()` Returns whether LayoutManager is currently attached to a RecyclerView which is attached to a window.
`Boolean`	`isFocused()` Returns true if the RecyclerView this LayoutManager is bound to has focus.
`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(@NonNull recycler: RecyclerView.Recycler, @NonNull state: RecyclerView.State)` Returns whether layout is hierarchical or not to be used for accessibility. Default implementation returns false.
`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. It is on by default but it can be turned off via `setMeasurementCacheEnabled(boolean)`.
`Boolean`	`isSmoothScrolling()`
`Boolean`	`isViewPartiallyVisible(@NonNull child: View, completelyVisible: Boolean, acceptEndPointInclusion: Boolean)` Returns whether the given child view is partially or fully visible within the padded bounded area of RecyclerView, depending on the input parameters. A view is partially visible if it has non-zero overlap with RV's padded bounded area. If acceptEndPointInclusion flag is set to true, it's also considered partially visible if it's located outside RV's bounds and it's hitting either RV's start or end bounds.
`Unit`	`layoutDecorated(@NonNull child: View, left: Int, top: Int, right: Int, bottom: Int)` Lay out the given child view within the RecyclerView using coordinates that include any current `ItemDecorations`. LayoutManagers should prefer working in sizes and coordinates that include item decoration insets whenever possible. This allows the LayoutManager to effectively ignore decoration insets within measurement and layout code. See the following methods: `layoutDecoratedWithMargins(View, int, int, int, int)` `getDecoratedBoundsWithMargins(View, Rect)` `measureChild(View, int, int)` `measureChildWithMargins(View, int, int)` `getDecoratedLeft(View)` `getDecoratedTop(View)` `getDecoratedRight(View)` `getDecoratedBottom(View)` `getDecoratedMeasuredWidth(View)` `getDecoratedMeasuredHeight(View)`
`Unit`	`layoutDecoratedWithMargins(@NonNull child: View, left: Int, top: Int, right: Int, bottom: Int)` Lay out the given child view within the RecyclerView using coordinates that include any current `ItemDecorations` and margins. LayoutManagers should prefer working in sizes and coordinates that include item decoration insets whenever possible. This allows the LayoutManager to effectively ignore decoration insets within measurement and layout code. See the following methods: `layoutDecorated(View, int, int, int, int)` `measureChild(View, int, int)` `measureChildWithMargins(View, int, int)` `getDecoratedLeft(View)` `getDecoratedTop(View)` `getDecoratedRight(View)` `getDecoratedBottom(View)` `getDecoratedMeasuredWidth(View)` `getDecoratedMeasuredHeight(View)`
`Unit`	`measureChild(@NonNull child: View, widthUsed: Int, heightUsed: Int)` Measure a child view using standard measurement policy, taking the padding of the parent RecyclerView and any added item decorations into account. If the RecyclerView can be scrolled in either dimension the caller may pass 0 as the widthUsed or heightUsed parameters as they will be irrelevant.
`Unit`	`measureChildWithMargins(@NonNull child: View, widthUsed: Int, heightUsed: Int)` 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. If the RecyclerView can be scrolled in either dimension the caller may pass 0 as the widthUsed or heightUsed parameters as they will be irrelevant.
`Unit`	`moveView(fromIndex: Int, toIndex: Int)` Moves a View from one position to another.
`Unit`	`offsetChildrenHorizontal(@Px dx: Int)` Offset all child views attached to the parent RecyclerView by dx pixels along the horizontal axis.
`Unit`	`offsetChildrenVertical(@Px dy: Int)` Offset all child views attached to the parent RecyclerView by dy pixels along the vertical axis.
`Unit`	`onAdapterChanged(@Nullable oldAdapter: RecyclerView.Adapter<RecyclerView.ViewHolder!>?, @Nullable newAdapter: RecyclerView.Adapter<RecyclerView.ViewHolder!>?)` Called if the RecyclerView this LayoutManager is bound to has a different adapter set via `RecyclerView#setAdapter(Adapter)` or `RecyclerView#swapAdapter(Adapter, boolean)`. The LayoutManager may use this opportunity to clear caches and configure state such that it can relayout appropriately with the new data and potentially new view types. The default implementation removes all currently attached views.
`Boolean`	`onAddFocusables(@NonNull recyclerView: RecyclerView, @NonNull views: ArrayList<View!>, direction: Int, focusableMode: Int)` Called to populate focusable views within the RecyclerView. The LayoutManager implementation should return `true` if the default behavior of `ViewGroup#addFocusables(java.util.ArrayList, int)` should be suppressed. The default implementation returns `false` to trigger RecyclerView to fall back to the default ViewGroup behavior.
`Unit`	`onAttachedToWindow(view: RecyclerView!)` Called when this LayoutManager is both attached to a RecyclerView and that RecyclerView is attached to a window. If the RecyclerView is re-attached with the same LayoutManager and Adapter, it may not call `onLayoutChildren(Recycler, State)` if nothing has changed and a layout was not requested on the RecyclerView while it was detached. Subclass implementations should always call through to the superclass implementation.
`Unit`	`onDetachedFromWindow(view: RecyclerView!)`
`Unit`	`onInitializeAccessibilityEvent(@NonNull recycler: RecyclerView.Recycler, @NonNull state: RecyclerView.State, @NonNull event: AccessibilityEvent)` Called by the accessibility delegate to initialize an accessibility event. Default implementation adds item count and scroll information to the event.
`Unit`	`onInitializeAccessibilityNodeInfo(@NonNull recycler: RecyclerView.Recycler, @NonNull state: RecyclerView.State, @NonNull info: AccessibilityNodeInfoCompat)` Called by the AccessibilityDelegate when the information about the current layout should be populated. Default implementation adds a . You should override `getRowCountForAccessibility(RecyclerView.Recycler, RecyclerView.State)`, `getColumnCountForAccessibility(RecyclerView.Recycler, RecyclerView.State)`, `isLayoutHierarchical(RecyclerView.Recycler, RecyclerView.State)` and `getSelectionModeForAccessibility(RecyclerView.Recycler, RecyclerView.State)` for more accurate accessibility information.
`Unit`	`onInitializeAccessibilityNodeInfoForItem(@NonNull recycler: RecyclerView.Recycler, @NonNull state: RecyclerView.State, @NonNull host: View, @NonNull info: AccessibilityNodeInfoCompat)` Called by the AccessibilityDelegate when the accessibility information for a specific item should be populated. Default implementation adds basic positioning information about the item.
`View?`	`onInterceptFocusSearch(@NonNull focused: View, direction: Int)` This method gives a LayoutManager an opportunity to intercept the initial focus search before the default behavior of `FocusFinder` is used. If this method returns null FocusFinder will attempt to find a focusable child view. If it fails then `onFocusSearchFailed(View, int, RecyclerView.Recycler, RecyclerView.State)` will be called to give the LayoutManager an opportunity to add new views for items that did not have attached views representing them. The LayoutManager should not add or remove views from this method.
`Unit`	`onItemsAdded(@NonNull recyclerView: RecyclerView, positionStart: Int, itemCount: Int)` Called when items have been added to the adapter. The LayoutManager may choose to requestLayout if the inserted items would require refreshing the currently visible set of child views. (e.g. currently empty space would be filled by appended items, etc.)
`Unit`	`onItemsChanged(@NonNull recyclerView: RecyclerView)` Called in response to a call to `Adapter#notifyDataSetChanged()` or `RecyclerView#swapAdapter(Adapter, boolean)` ()} and signals that the the entire data set has changed.
`Unit`	`onItemsMoved(@NonNull recyclerView: RecyclerView, from: Int, to: Int, itemCount: Int)` Called when an item is moved withing the adapter. Note that, an item may also change position in response to another ADD/REMOVE/MOVE operation. This callback is only called if and only if `Adapter#notifyItemMoved` is called.
`Unit`	`onItemsRemoved(@NonNull recyclerView: RecyclerView, positionStart: Int, itemCount: Int)` Called when items have been removed from the adapter.
`Unit`	`onItemsUpdated(@NonNull recyclerView: RecyclerView, positionStart: Int, itemCount: Int)` Called when items have been changed in the adapter. To receive payload, override `onItemsUpdated(RecyclerView, int, int, Object)` instead, then this callback will not be invoked.
`Unit`	`onItemsUpdated(@NonNull recyclerView: RecyclerView, positionStart: Int, itemCount: Int, @Nullable payload: Any?)` Called when items have been changed in the adapter and with optional payload. Default implementation calls `onItemsUpdated(RecyclerView, int, int)`.
`Unit`	`onMeasure(@NonNull recycler: RecyclerView.Recycler, @NonNull state: RecyclerView.State, widthSpec: Int, heightSpec: Int)` Measure the attached RecyclerView. Implementations must call `setMeasuredDimension(int, int)` before returning. It is strongly advised to use the AutoMeasure mechanism by overriding `isAutoMeasureEnabled()` to return true as AutoMeasure handles all the standard measure cases including when the RecyclerView's layout_width or layout_height have been set to wrap_content. If `isAutoMeasureEnabled()` is overridden to return true, this method should not be overridden. The default implementation will handle EXACTLY measurements and respect the minimum width and height properties of the host RecyclerView if measured as UNSPECIFIED. AT_MOST measurements will be treated as EXACTLY and the RecyclerView will consume all available space.
`Boolean`	`onRequestChildFocus(@NonNull parent: RecyclerView, @NonNull child: View, @Nullable focused: View?)`
`Boolean`	`onRequestChildFocus(@NonNull parent: RecyclerView, @NonNull state: RecyclerView.State, @NonNull child: View, @Nullable focused: View?)` Called when a descendant view of the RecyclerView requests focus. A LayoutManager wishing to keep focused views aligned in a specific portion of the view may implement that behavior in an override of this method. If the LayoutManager executes different behavior that should override the default behavior of scrolling the focused child on screen instead of running alongside it, this method should return true.
`Unit`	`onScrollStateChanged(state: Int)` RecyclerView calls this method to notify LayoutManager that scroll state has changed.
`Boolean`	`performAccessibilityAction(@NonNull recycler: RecyclerView.Recycler, @NonNull state: RecyclerView.State, action: Int, @Nullable args: Bundle?)` Called by AccessibilityDelegate when an action is requested from the RecyclerView.
`Boolean`	`performAccessibilityActionForItem(@NonNull recycler: RecyclerView.Recycler, @NonNull state: RecyclerView.State, @NonNull view: View, action: Int, @Nullable args: Bundle?)` Called by AccessibilityDelegate when an accessibility action is requested on one of the children of LayoutManager. Default implementation does not do anything.
`Unit`	`postOnAnimation(action: Runnable!)` Causes the Runnable to execute on the next animation time step. The runnable will be run on the user interface thread. Calling this method when LayoutManager is not attached to a RecyclerView has no effect.
`Unit`	`removeAllViews()` Remove all views from the currently attached RecyclerView. This will not recycle any of the affected views; the LayoutManager is responsible for doing so if desired.
`Unit`	`removeAndRecycleAllViews(@NonNull recycler: RecyclerView.Recycler)` Removes all views and recycles them using the given recycler. If you want to clean cached views as well, you should call `Recycler#clear()` too. If a View is marked as "ignored", it is not removed nor recycled.
`Unit`	`removeAndRecycleView(@NonNull child: View, @NonNull recycler: RecyclerView.Recycler)` Remove a child view and recycle it using the given Recycler.
`Unit`	`removeAndRecycleViewAt(index: Int, @NonNull recycler: RecyclerView.Recycler)` Remove a child view and recycle it using the given Recycler.
`Boolean`	`removeCallbacks(action: Runnable!)` Removes the specified Runnable from the message queue. Calling this method when LayoutManager is not attached to a RecyclerView has no effect.
`Unit`	`removeDetachedView(@NonNull child: View)` Finish removing a view that was previously temporarily `detached`.
`Unit`	`removeView(child: View!)` Remove a view from the currently attached RecyclerView if needed. LayoutManagers should use this method to completely remove a child view that is no longer needed. LayoutManagers should strongly consider recycling removed views using `Recycler#recycleView(android.view.View)`.
`Unit`	`removeViewAt(index: Int)` Remove a view from the currently attached RecyclerView if needed. LayoutManagers should use this method to completely remove a child view that is no longer needed. LayoutManagers should strongly consider recycling removed views using `Recycler#recycleView(android.view.View)`.
`Boolean`	`requestChildRectangleOnScreen(@NonNull parent: RecyclerView, @NonNull child: View, @NonNull rect: Rect, immediate: Boolean)` Called when a child of the RecyclerView wants a particular rectangle to be positioned onto the screen. See `ViewParent#requestChildRectangleOnScreen(android.view.View, * android.graphics.Rect, boolean)` for more details. The base implementation will attempt to perform a standard programmatic scroll to bring the given rect into view, within the padded area of the RecyclerView.
`Boolean`	`requestChildRectangleOnScreen(@NonNull parent: RecyclerView, @NonNull child: View, @NonNull rect: Rect, immediate: Boolean, focusedChildVisible: Boolean)` Requests that the given child of the RecyclerView be positioned onto the screen. This method can be called for both unfocusable and focusable child views. For unfocusable child views, focusedChildVisible is typically true in which case, layout manager makes the child view visible only if the currently focused child stays in-bounds of RV.
`Unit`	`requestLayout()` Calls `RecyclerView#requestLayout` on the underlying RecyclerView
`Unit`	`requestSimpleAnimationsInNextLayout()` A LayoutManager can call this method to force RecyclerView to run simple animations in the next layout pass, even if there is not any trigger to do so. (e.g. adapter data change). Note that, calling this method will not guarantee that RecyclerView will run animations at all. For example, if there is not any `ItemAnimator` set, RecyclerView will not run any animations but will still clear this flag after the layout is complete.
`Unit`	`setAutoMeasureEnabled(enabled: Boolean)` Defines 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 `LayoutManager#onMeasure(Recycler, State, int, int)`.
`Unit`	`setItemPrefetchEnabled(enabled: Boolean)` Sets whether the LayoutManager should be queried for views outside of its viewport while the UI thread is idle between frames. If enabled, the LayoutManager will be queried for items to inflate/bind in between view system traversals on devices running API 21 or greater. Default value is true. On platforms API level 21 and higher, the UI thread is idle between passing a frame to RenderThread and the starting up its next frame at the next VSync pulse. By prefetching out of window views in this time period, delays from inflation and view binding are much less likely to cause jank and stuttering during scrolls and flings. While prefetch is enabled, it will have the side effect of expanding the effective size of the View cache to hold prefetched views.
`Unit`	`setMeasuredDimension(childrenBounds: Rect!, wSpec: Int, hSpec: Int)` Sets the measured dimensions from the given bounding box of the children and the measurement specs that were passed into `RecyclerView#onMeasure(int, int)`. It is only called if a LayoutManager returns `true` from `isAutoMeasureEnabled()` and it is called after the RecyclerView calls `LayoutManager#onLayoutChildren(Recycler, State)` in the execution of `RecyclerView#onMeasure(int, int)`. This method must call `setMeasuredDimension(int, int)`. The default implementation adds the RecyclerView's padding to the given bounding box then caps the value to be within the given measurement specs.
`Unit`	`setMeasuredDimension(widthSize: Int, heightSize: Int)` `Set the measured dimensions` of the host RecyclerView.
`Unit`	`setMeasurementCacheEnabled(measurementCacheEnabled: Boolean)` Sets whether RecyclerView should use its own measurement cache for the children. This is a more aggressive cache than the framework uses.
`Unit`	`startSmoothScroll(smoothScroller: RecyclerView.SmoothScroller!)` Starts a smooth scroll using the provided `SmoothScroller`. Each instance of SmoothScroller is intended to only be used once. Provide a new SmoothScroller instance each time this method is called. Calling this method will cancel any previous smooth scroll request.
`Unit`	`stopIgnoringView(@NonNull view: View)` View can be scrapped and recycled again. Note that calling this method removes all information in the view holder. You can call this method only if your LayoutManger is in onLayout or onScroll callback.

From class LinearLayoutManager

`Unit`	`assertNotInLayoutOrScroll(message: String!)`
`Unit`	`calculateExtraLayoutSpace(@NonNull state: RecyclerView.State, @NonNull extraLayoutSpace: IntArray)` Calculates the amount of extra space (in pixels) that should be laid out by and stores the result in `extraLayoutSpace`. `extraLayoutSpace[0]` should be used for the extra space at the top/left, and `extraLayoutSpace[1]` should be used for the extra space at the bottom/right (depending on the orientation). Thus, the side where it is applied is unaffected by (LTR vs RTL), `getStackFromEnd()` and . Negative values are ignored. By default, `LinearLayoutManager` lays out 1 extra page of items while smooth scrolling, in the direction of the scroll, and no extra space is laid out in all other situations. You can override this method to implement your own custom pre-cache logic. Use `RecyclerView.State#hasTargetScrollPosition()` to find out if a smooth scroll to a position is in progress, and `RecyclerView.State#getTargetScrollPosition()` to find out which item it is scrolling to. Note:Laying out extra items generally comes with significant performance cost. It's typically only desirable in places like smooth scrolling to an unknown location, where 1) the extra content helps LinearLayoutManager know in advance when its target is approaching, so it can decelerate early and smoothly and 2) while motion is continuous. Extending the extra layout space is especially expensive if done while the user may change scrolling direction. In the default implementation, changing direction will cause the extra layout space to swap to the opposite side of the viewport, incurring many rebinds/recycles, unless the cache is large enough to handle it.
`Boolean`	`canScrollHorizontally()`
`Boolean`	`canScrollVertically()`
`Unit`	`collectAdjacentPrefetchPositions(dx: Int, dy: Int, state: RecyclerView.State!, layoutPrefetchRegistry: RecyclerView.LayoutManager.LayoutPrefetchRegistry!)`
`Unit`	`collectInitialPrefetchPositions(adapterItemCount: Int, layoutPrefetchRegistry: RecyclerView.LayoutManager.LayoutPrefetchRegistry!)`
`Int`	`computeHorizontalScrollExtent(state: RecyclerView.State)`
`PointF?`	`computeScrollVectorForPosition(targetPosition: Int)`
`Int`	`computeVerticalScrollExtent(state: RecyclerView.State)`
`Int`	`findFirstCompletelyVisibleItemPosition()` Returns the adapter position of the first fully visible view. This position does not include adapter changes that were dispatched after the last layout pass. Note that bounds check is only performed in the current orientation. That means, if LayoutManager is horizontal, it will only check the view's left and right edges.
`Int`	`findFirstVisibleItemPosition()` Returns the adapter position of the first visible view. This position does not include adapter changes that were dispatched after the last layout pass. Note that, this value is not affected by layout orientation or item order traversal. (`setReverseLayout(boolean)`). Views are sorted by their positions in the adapter, not in the layout. If RecyclerView has item decorators, they will be considered in calculations as well. LayoutManager may pre-cache some views that are not necessarily visible. Those views are ignored in this method.
`Int`	`findLastCompletelyVisibleItemPosition()` Returns the adapter position of the last fully visible view. This position does not include adapter changes that were dispatched after the last layout pass. Note that bounds check is only performed in the current orientation. That means, if LayoutManager is horizontal, it will only check the view's left and right edges.
`Int`	`findLastVisibleItemPosition()` Returns the adapter position of the last visible view. This position does not include adapter changes that were dispatched after the last layout pass. Note that, this value is not affected by layout orientation or item order traversal. (`setReverseLayout(boolean)`). Views are sorted by their positions in the adapter, not in the layout. If RecyclerView has item decorators, they will be considered in calculations as well. LayoutManager may pre-cache some views that are not necessarily visible. Those views are ignored in this method.
`View?`	`findViewByPosition(position: Int)` Finds the view which represents the given adapter position. This method traverses each child since it has no information about child order. Override this method to improve performance if your LayoutManager keeps data about child views. If a view is ignored via `ignoreView(View)`, it is also ignored by this method.
`Int`	`getExtraLayoutSpace(state: RecyclerView.State!)` Returns the amount of extra space that should be laid out by LayoutManager. By default, `LinearLayoutManager` lays out 1 extra page of items while smooth scrolling and 0 otherwise. You can override this method to implement your custom layout pre-cache logic. Note:Laying out invisible elements generally comes with significant performance cost. It's typically only desirable in places like smooth scrolling to an unknown location, where 1) the extra content helps LinearLayoutManager know in advance when its target is approaching, so it can decelerate early and smoothly and 2) while motion is continuous. Extending the extra layout space is especially expensive if done while the user may change scrolling direction. Changing direction will cause the extra layout space to swap to the opposite side of the viewport, incurring many rebinds/recycles, unless the cache is large enough to handle it.
`Int`	`getInitialPrefetchItemCount()` Gets the number of items to prefetch in `collectInitialPrefetchPositions(int, LayoutPrefetchRegistry)`, which defines how many inner items should be prefetched when this LayoutManager's RecyclerView is nested inside another RecyclerView.
`Int`	`getOrientation()` Returns the current orientation of the layout.
`Boolean`	`getRecycleChildrenOnDetach()` Returns whether LayoutManager will recycle its children when it is detached from RecyclerView.
`Boolean`	`getReverseLayout()` Returns if views are laid out from the opposite direction of the layout.
`Boolean`	`getStackFromEnd()`
`Boolean`	`isAutoMeasureEnabled()`
`Boolean`	`isLayoutRTL()`
`Boolean`	`isSmoothScrollbarEnabled()` Returns the current state of the smooth scrollbar feature. It is enabled by default.
`Unit`	`onDetachedFromWindow(view: RecyclerView!, recycler: RecyclerView.Recycler!)`
`Unit`	`onInitializeAccessibilityEvent(event: AccessibilityEvent)`
`Unit`	`onRestoreInstanceState(state: Parcelable!)`
`Parcelable?`	`onSaveInstanceState()`
`Unit`	`prepareForDrop(@NonNull view: View, @NonNull target: View, x: Int, y: Int)` Called by the `ItemTouchHelper` after a View is dropped over another View. A LayoutManager should implement this interface to get ready for the upcoming move operation. For example, LinearLayoutManager sets up a "scrollToPositionWithOffset" calls so that the View under drag will be used as an anchor View while calculating the next layout, making layout stay consistent.
`Unit`	`scrollToPosition(position: Int)` Scroll the RecyclerView to make the position visible. RecyclerView will scroll the minimum amount that is necessary to make the target position visible. If you are looking for a similar behavior to `android.widget.ListView#setSelection(int)` or `android.widget.ListView#setSelectionFromTop(int, int)`, use `scrollToPositionWithOffset(int, int)`. Note that scroll position change will not be reflected until the next layout call.
`Unit`	`scrollToPositionWithOffset(position: Int, offset: Int)` Scroll to the specified adapter position with the given offset from resolved layout start. Resolved layout start depends on `getReverseLayout()`, `ViewCompat#getLayoutDirection(android.view.View)` and `getStackFromEnd()`. For example, if layout is `VERTICAL` and `getStackFromEnd()` is true, calling `scrollToPositionWithOffset(10, 20)` will layout such that `item[10]`'s bottom is 20 pixels above the RecyclerView's bottom. Note that scroll position change will not be reflected until the next layout call. If you are just trying to make a position visible, use `scrollToPosition(int)`.
`Unit`	`setInitialPrefetchItemCount(itemCount: Int)` Sets the number of items to prefetch in `collectInitialPrefetchPositions(int, LayoutPrefetchRegistry)`, which defines how many inner items should be prefetched when this LayoutManager's RecyclerView is nested inside another RecyclerView. Set this value to the number of items this inner LayoutManager will display when it is first scrolled into the viewport. RecyclerView will attempt to prefetch that number of items so they are ready, avoiding jank as the inner RecyclerView is scrolled into the viewport. For example, take a vertically scrolling RecyclerView with horizontally scrolling inner RecyclerViews. The rows always have 4 items visible in them (or 5 if not aligned). Passing `4` to this method for each inner RecyclerView's LinearLayoutManager will enable RecyclerView's prefetching feature to do create/bind work for 4 views within a row early, before it is scrolled on screen, instead of just the default 2. Calling this method does nothing unless the LayoutManager is in a RecyclerView nested in another RecyclerView. Note: Setting this value to be larger than the number of views that will be visible in this view can incur unnecessary bind work, and an increase to the number of Views created and in active use.
`Unit`	`setOrientation(orientation: Int)` Sets the orientation of the layout. `LinearLayoutManager` will do its best to keep scroll position.
`Unit`	`setRecycleChildrenOnDetach(recycleChildrenOnDetach: Boolean)` Set whether LayoutManager will recycle its children when it is detached from RecyclerView. If you are using a `RecyclerView.RecycledViewPool`, it might be a good idea to set this flag to `true` so that views will be available to other RecyclerViews immediately. Note that, setting this flag will result in a performance drop if RecyclerView is restored.
`Unit`	`setReverseLayout(reverseLayout: Boolean)` Used to reverse item traversal and layout order. This behaves similar to the layout change for RTL views. When set to true, first item is laid out at the end of the UI, second item is laid out before it etc. For horizontal layouts, it depends on the layout direction. When set to true, If `RecyclerView` is LTR, than it will layout from RTL, if `RecyclerView`} is RTL, it will layout from LTR. If you are looking for the exact same behavior of `android.widget.AbsListView#setStackFromBottom(boolean)`, use `setStackFromEnd(boolean)`
`Unit`	`setSmoothScrollbarEnabled(enabled: Boolean)` When smooth scrollbar is enabled, the position and size of the scrollbar thumb is computed based on the number of visible pixels in the visible items. This however assumes that all list items have similar or equal widths or heights (depending on list orientation). If you use a list in which items have different dimensions, the scrollbar will change appearance as the user scrolls through the list. To avoid this issue, you need to disable this property. When smooth scrollbar is disabled, the position and size of the scrollbar thumb is based solely on the number of items in the adapter and the position of the visible items inside the adapter. This provides a stable scrollbar as the user navigates through a list of items with varying widths / heights.
`Unit`	`smoothScrollToPosition(recyclerView: RecyclerView!, state: RecyclerView.State!, position: Int)`

Constants

DEFAULT_SPAN_COUNT

static val DEFAULT_SPAN_COUNT: Int

Value: -1

Public constructors

<init>

GridLayoutManager(
    context: Context!, 
    attrs: AttributeSet!, 
    defStyleAttr: Int, 
    defStyleRes: Int)

Constructor used when layout manager is set in XML by RecyclerView attribute "layoutManager". If spanCount is not specified in the XML, it defaults to a single column. androidx.recyclerview.R.attr#spanCount

<init>

GridLayoutManager(
    context: Context!, 
    spanCount: Int)

Creates a vertical GridLayoutManager

Parameters
`context`	Context!: Current context, will be used to access resources.
`spanCount`	Int: The number of columns in the grid

<init>

GridLayoutManager(
    context: Context!, 
    spanCount: Int, 
    orientation: Int, 
    reverseLayout: Boolean)

Parameters
`context`	Context!: Current context, will be used to access resources.
`spanCount`	Int: The number of columns or rows in the grid
`orientation`	Int: Layout orientation. Should be `HORIZONTAL` or .
`reverseLayout`	Boolean: When set to true, layouts from end to start.

Public methods

checkLayoutParams

open fun checkLayoutParams(lp: RecyclerView.LayoutParams!): Boolean

computeHorizontalScrollOffset

open fun computeHorizontalScrollOffset(state: RecyclerView.State): Int

computeHorizontalScrollRange

open fun computeHorizontalScrollRange(state: RecyclerView.State): Int

computeVerticalScrollOffset

open fun computeVerticalScrollOffset(state: RecyclerView.State): Int

computeVerticalScrollRange

open fun computeVerticalScrollRange(state: RecyclerView.State): Int

generateDefaultLayoutParams

open fun generateDefaultLayoutParams(): RecyclerView.LayoutParams!

generateLayoutParams

open fun generateLayoutParams(
    c: Context!, 
    attrs: AttributeSet!
): RecyclerView.LayoutParams!

generateLayoutParams

open fun generateLayoutParams(lp: LayoutParams!): RecyclerView.LayoutParams!

getColumnCountForAccessibility

open fun getColumnCountForAccessibility(
    recycler: RecyclerView.Recycler, 
    state: RecyclerView.State
): Int

getRowCountForAccessibility

open fun getRowCountForAccessibility(
    recycler: RecyclerView.Recycler, 
    state: RecyclerView.State
): Int

getSpanCount

open fun getSpanCount(): Int

Returns the number of spans laid out by this grid.

Return
`Int`	The number of spans

See Also

#setSpanCount(int)

getSpanSizeLookup

open fun getSpanSizeLookup(): GridLayoutManager.SpanSizeLookup!

Returns the current SpanSizeLookup used by the GridLayoutManager.

Return
`GridLayoutManager.SpanSizeLookup!`	The current `SpanSizeLookup` used by the GridLayoutManager.

isUsingSpansToEstimateScrollbarDimensions

open fun isUsingSpansToEstimateScrollbarDimensions(): Boolean

Returns true if the scroll offset and scroll range calculations take account of span information. See setUsingSpansToEstimateScrollbarDimensions(boolean) for more information on this topic. Defaults to false.

Return
`Boolean`	true if the scroll offset and scroll range calculations take account of span information.

onFocusSearchFailed

open fun onFocusSearchFailed(
    focused: View, 
    focusDirection: Int, 
    recycler: RecyclerView.Recycler, 
    state: RecyclerView.State
): View?

onInitializeAccessibilityNodeInfoForItem

open fun onInitializeAccessibilityNodeInfoForItem(
    recycler: RecyclerView.Recycler, 
    state: RecyclerView.State, 
    host: View, 
    info: AccessibilityNodeInfoCompat
): Unit

onItemsAdded

open fun onItemsAdded(
    recyclerView: RecyclerView, 
    positionStart: Int, 
    itemCount: Int
): Unit

onItemsChanged

open fun onItemsChanged(recyclerView: RecyclerView): Unit

onItemsMoved

open fun onItemsMoved(
    recyclerView: RecyclerView, 
    from: Int, 
    to: Int, 
    itemCount: Int
): Unit

onItemsRemoved

open fun onItemsRemoved(
    recyclerView: RecyclerView, 
    positionStart: Int, 
    itemCount: Int
): Unit

onItemsUpdated

open fun onItemsUpdated(
    recyclerView: RecyclerView, 
    positionStart: Int, 
    itemCount: Int, 
    payload: Any?
): Unit

onLayoutChildren

open fun onLayoutChildren(
    recycler: RecyclerView.Recycler!, 
    state: RecyclerView.State!
): Unit

onLayoutCompleted

open fun onLayoutCompleted(state: RecyclerView.State!): Unit

scrollHorizontallyBy

open fun scrollHorizontallyBy(
    dx: Int, 
    recycler: RecyclerView.Recycler!, 
    state: RecyclerView.State!
): Int

scrollVerticallyBy

open fun scrollVerticallyBy(
    dy: Int, 
    recycler: RecyclerView.Recycler!, 
    state: RecyclerView.State!
): Int

setMeasuredDimension

open fun setMeasuredDimension(
    childrenBounds: Rect!, 
    wSpec: Int, 
    hSpec: Int
): Unit

setSpanCount

open fun setSpanCount(spanCount: Int): Unit

Sets the number of spans to be laid out.

If getOrientation() is VERTICAL, this is the number of columns. If getOrientation() is HORIZONTAL, this is the number of rows.

Parameters
`spanCount`	Int: The total number of spans in the grid

See Also

#getSpanCount()

setSpanSizeLookup

open fun setSpanSizeLookup(spanSizeLookup: GridLayoutManager.SpanSizeLookup!): Unit

Sets the source to get the number of spans occupied by each item in the adapter.

Parameters
`spanSizeLookup`	GridLayoutManager.SpanSizeLookup!: `SpanSizeLookup` instance to be used to query number of spans occupied by each item

setStackFromEnd

open fun setStackFromEnd(stackFromEnd: Boolean): Unit

stackFromEnd is not supported by GridLayoutManager. Consider using setReverseLayout(boolean).

setUsingSpansToEstimateScrollbarDimensions

open fun setUsingSpansToEstimateScrollbarDimensions(useSpansToEstimateScrollBarDimensions: Boolean): Unit

When this flag is set, the scroll offset and scroll range calculations will take account of span information.

This is will increase the accuracy of the scroll bar's size and offset but will require more calls to SpanSizeLookup#getSpanGroupIndex(int, int)".

This additional accuracy may or may not be needed, depending on the characteristics of your layout. You will likely benefit from this accuracy when:

The variation in item span sizes is large.
The size of your data set is small (if your data set is large, the scrollbar will likely be very small anyway, and thus the increased accuracy has less impact).
Calls to SpanSizeLookup#getSpanGroupIndex(int, int) are fast.

If you decide to enable this feature, you should be sure that calls to SpanSizeLookup#getSpanGroupIndex(int, int) are fast, that set span group index caching is set to true via a call to and span index caching is also enabled via a call to.

supportsPredictiveItemAnimations

open fun supportsPredictiveItemAnimations(): Boolean