RecyclerView

Artifact: androidx.recyclerview:recyclerview

Added in 1.0.0

Kotlin |Java

class RecyclerView : ViewGroup, ScrollingView, NestedScrollingChild2, NestedScrollingChild3

kotlin.Any
↳	android.view.View
	↳	android.view.ViewGroup
		↳	androidx.recyclerview.widget.RecyclerView

Known direct subclasses

BaseGridView, WearableRecyclerView

`BaseGridView`	An abstract base class for vertically and horizontally scrolling lists.
`WearableRecyclerView`	Wearable specific implementation of the `RecyclerView` enabling `setCircularScrollingGestureEnabled` circular scrolling} and semi-circular layouts.

Known indirect subclasses

HorizontalGridView, VerticalGridView

`HorizontalGridView`	A `android.view.ViewGroup` that shows items in a horizontal scrolling list.
`VerticalGridView`	A `android.view.ViewGroup` that shows items in a vertically scrolling list.

A flexible view for providing a limited window into a large data set.

Glossary of terms:

Adapter: A subclass of Adapter responsible for providing views that represent items in a data set.
Position: The position of a data item within an Adapter.
Index: The index of an attached child view as used in a call to getChildAt. Contrast with Position.
Binding: The process of preparing a child view to display data corresponding to a position within the adapter.
Recycle (view): A view previously used to display data for a specific adapter position may be placed in a cache for later reuse to display the same type of data again later. This can drastically improve performance by skipping initial layout inflation or construction.
Scrap (view): A child view that has entered into a temporarily detached state during layout. Scrap views may be reused without becoming fully detached from the parent RecyclerView, either unmodified if no rebinding is required or modified by the adapter if the view was considered dirty.
Dirty (view): A child view that must be rebound by the adapter before being displayed.

Positions in RecyclerView:

RecyclerView introduces an additional level of abstraction between the Adapter and LayoutManager to be able to detect data set changes in batches during a layout calculation. This saves LayoutManager from tracking adapter changes to calculate animations. It also helps with performance because all view bindings happen at the same time and unnecessary bindings are avoided.

For this reason, there are two types of position related methods in RecyclerView:

layout position: Position of an item in the latest layout calculation. This is the position from the LayoutManager's perspective.
adapter position: Position of an item in the adapter. This is the position from the Adapter's perspective.

These two positions are the same except the time between dispatching adapter.notify* events and calculating the updated layout.

Methods that return or receive *LayoutPosition* use position as of the latest layout calculation (e.g. getLayoutPosition, findViewHolderForLayoutPosition). These positions include all changes until the last layout calculation. You can rely on these positions to be consistent with what user is currently seeing on the screen. For example, if you have a list of items on the screen and user asks for the 5th element, you should use these methods as they'll match what user is seeing.

The other set of position related methods are in the form of *AdapterPosition*. (e.g. getAbsoluteAdapterPosition, getBindingAdapterPosition, findViewHolderForAdapterPosition) You should use these methods when you need to work with up-to-date adapter positions even if they may not have been reflected to layout yet. For example, if you want to access the item in the adapter on a ViewHolder click, you should use getBindingAdapterPosition. Beware that these methods may not be able to calculate adapter positions if notifyDataSetChanged has been called and new layout has not yet been calculated. For this reasons, you should carefully handle NO_POSITION or null results from these methods.

When writing a LayoutManager you almost always want to use layout positions whereas when writing an Adapter, you probably want to use adapter positions.

Presenting Dynamic Data

To display updatable data in a RecyclerView, your adapter needs to signal inserts, moves, and deletions to RecyclerView. You can build this yourself by manually calling adapter.notify* methods when content changes, or you can use one of the easier solutions RecyclerView provides: List diffing with DiffUtil If your RecyclerView is displaying a list that is re-fetched from scratch for each update (e.g. from the network, or from a database), DiffUtil can calculate the difference between versions of the list. DiffUtil takes both lists as input and computes the difference, which can be passed to RecyclerView to trigger minimal animations and updates to keep your UI performant, and animations meaningful. This approach requires that each list is represented in memory with immutable content, and relies on receiving updates as new instances of lists. This approach is also ideal if your UI layer doesn't implement sorting, it just presents the data in the order it's given.

The best part of this approach is that it extends to any arbitrary changes - item updates, moves, addition and removal can all be computed and handled the same way. Though you do have to keep two copies of the list in memory while diffing, and must avoid mutating them, it's possible to share unmodified elements between list versions.

There are three primary ways to do this for RecyclerView. We recommend you start with ListAdapter, the higher-level API that builds in List diffing on a background thread, with minimal code. AsyncListDiffer also provides this behavior, but without defining an Adapter to subclass. If you want more control, DiffUtil is the lower-level API you can use to compute the diffs yourself. Each approach allows you to specify how diffs should be computed based on item data.

List mutation with SortedList If your RecyclerView receives updates incrementally, e.g. item X is inserted, or item Y is removed, you can use SortedList to manage your list. You define how to order items, and it will automatically trigger update signals that RecyclerView can use. SortedList works if you only need to handle insert and remove events, and has the benefit that you only ever need to have a single copy of the list in memory. It can also compute differences with replaceAll, but this method is more limited than the list diffing behavior above. Paging Library The Paging library extends the diff-based approach to additionally support paged loading. It provides the androidx.paging.PagedList class that operates as a self-loading list, provided a source of data like a database, or paginated network API. It provides convenient list diffing support out of the box, similar to ListAdapter and AsyncListDiffer. For more information about the Paging library, see the library documentation. layoutManager

Summary

Nested types
`abstract class RecyclerView.Adapter<VH : RecyclerView.ViewHolder?>` Base class for an Adapter
`enum RecyclerView.Adapter.StateRestorationPolicy` Defines how this Adapter wants to restore its state after a view reconstruction (e.g. configuration change).
`abstract class RecyclerView.AdapterDataObserver` Observer base class for watching changes to an `Adapter`.
`interface RecyclerView.ChildDrawingOrderCallback` A callback interface that can be used to alter the drawing order of RecyclerView children.
`class RecyclerView.EdgeEffectFactory` EdgeEffectFactory lets you customize the over-scroll edge effect for RecyclerViews.
`@Retention(value = RetentionPolicy.SOURCE) @IntDef(value = ) annotation RecyclerView.EdgeEffectFactory.EdgeDirection`
`abstract class RecyclerView.ItemAnimator` This class defines the animations that take place on items as changes are made to the adapter.
`@IntDef(flag = true, value = ) @Retention(value = RetentionPolicy.SOURCE) annotation RecyclerView.ItemAnimator.AdapterChanges` The set of flags that might be passed to `recordPreLayoutInformation`.
`interface RecyclerView.ItemAnimator.ItemAnimatorFinishedListener` This interface is used to inform listeners when all pending or running animations in an ItemAnimator are finished.
`class RecyclerView.ItemAnimator.ItemHolderInfo` A simple data structure that holds information about an item's bounds.
`abstract class RecyclerView.ItemDecoration` An ItemDecoration allows the application to add a special drawing and layout offset to specific item views from the adapter's data set.
`abstract class RecyclerView.LayoutManager` A `LayoutManager` is responsible for measuring and positioning item views within a `RecyclerView` as well as determining the policy for when to recycle item views that are no longer visible to the user.
`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.
`class RecyclerView.LayoutParams : ViewGroup.MarginLayoutParams` `LayoutParams` subclass for children of `RecyclerView`.
`interface RecyclerView.OnChildAttachStateChangeListener` A Listener interface that can be attached to a RecylcerView to get notified whenever a ViewHolder is attached to or detached from RecyclerView.
`abstract class RecyclerView.OnFlingListener` This class defines the behavior of fling if the developer wishes to handle it.
`interface RecyclerView.OnItemTouchListener` An OnItemTouchListener allows the application to intercept touch events in progress at the view hierarchy level of the RecyclerView before those touch events are considered for RecyclerView's own scrolling behavior.
`abstract class RecyclerView.OnScrollListener` An OnScrollListener can be added to a RecyclerView to receive messages when a scrolling event has occurred on that RecyclerView.
`class RecyclerView.RecycledViewPool` RecycledViewPool lets you share Views between multiple RecyclerViews.
`inner class RecyclerView.Recycler` A Recycler is responsible for managing scrapped or detached item views for reuse.
`interface RecyclerView.RecyclerListener` A RecyclerListener can be set on a RecyclerView to receive messages whenever a view is recycled.
`class RecyclerView.SimpleOnItemTouchListener : RecyclerView.OnItemTouchListener` An implementation of `RecyclerView.OnItemTouchListener` that has empty method bodies and default return values.
`abstract class RecyclerView.SmoothScroller` Base class for smooth scrolling.
`class RecyclerView.SmoothScroller.Action` Holds information about a smooth scroll request by a `SmoothScroller`.
`interface RecyclerView.SmoothScroller.ScrollVectorProvider` An interface which is optionally implemented by custom `RecyclerView.LayoutManager` to provide a hint to a `SmoothScroller` about the location of the target position.
`class RecyclerView.State` Contains useful information about the current RecyclerView state like target scroll position or view focus.
`abstract class RecyclerView.ViewCacheExtension` ViewCacheExtension is a helper class to provide an additional layer of view caching that can be controlled by the developer.
`abstract class RecyclerView.ViewHolder` A ViewHolder describes an item view and metadata about its place within the RecyclerView.

Constants
`const Int`	`HORIZONTAL = 0`
`const Int`	`INVALID_TYPE = -1`
`const Long`	`NO_ID = -1`
`const Int`	`NO_POSITION = -1`
`const Int`	`SCROLL_STATE_DRAGGING = 1` The RecyclerView is currently being dragged by outside input such as user touch input.
`const Int`	`SCROLL_STATE_IDLE = 0` The RecyclerView is not currently scrolling.
`const Int`	`SCROLL_STATE_SETTLING = 2` The RecyclerView is currently animating to a final position while not under outside control.
`const Int`	`TOUCH_SLOP_DEFAULT = 0` Constant for use with `setScrollingTouchSlop`.
`const Int`	`TOUCH_SLOP_PAGING = 1` Constant for use with `setScrollingTouchSlop`.
`const Int`	`UNDEFINED_DURATION = -2147483648` Constant that represents that a duration has not been defined.
`const Int`	`VERTICAL = 1`

Public constructors
`RecyclerView(context: Context)`
`RecyclerView(context: Context, attrs: AttributeSet?)`
`RecyclerView(context: Context, attrs: AttributeSet?, defStyleAttr: Int)`

Public functions
`Unit`	`addFocusables(views: ArrayList<View!>!, direction: Int, focusableMode: Int)`
`Unit`	`addItemDecoration(decor: RecyclerView.ItemDecoration)` Add an `ItemDecoration` to this RecyclerView.
`Unit`	`addItemDecoration(decor: RecyclerView.ItemDecoration, index: Int)` Add an `ItemDecoration` to this RecyclerView.
`Unit`	`addOnChildAttachStateChangeListener( listener: RecyclerView.OnChildAttachStateChangeListener )` Register a listener that will be notified whenever a child view is attached to or detached from RecyclerView.
`Unit`	`addOnItemTouchListener(listener: RecyclerView.OnItemTouchListener)` Add an `OnItemTouchListener` to intercept touch events before they are dispatched to child views or this view's standard scrolling behavior.
`Unit`	`addOnScrollListener(listener: RecyclerView.OnScrollListener)` Add a listener that will be notified of any changes in scroll state or position.
`Unit`	`addRecyclerListener(listener: RecyclerView.RecyclerListener)` Register a listener that will be notified whenever a child view is recycled.
`Unit`	`clearOnChildAttachStateChangeListeners()` Removes all listeners that were added via `addOnChildAttachStateChangeListener`.
`Unit`	`clearOnScrollListeners()` Remove all secondary listener that were notified of any changes in scroll state or position.
`Int`	`computeHorizontalScrollExtent()` Compute the horizontal extent of the horizontal scrollbar's thumb within the horizontal range.
`Int`	`computeHorizontalScrollOffset()` Compute the horizontal offset of the horizontal scrollbar's thumb within the horizontal range.
`Int`	`computeHorizontalScrollRange()` Compute the horizontal range that the horizontal scrollbar represents.
`Int`	`computeVerticalScrollExtent()` Compute the vertical extent of the vertical scrollbar's thumb within the vertical range.
`Int`	`computeVerticalScrollOffset()` Compute the vertical offset of the vertical scrollbar's thumb within the vertical range.
`Int`	`computeVerticalScrollRange()` Compute the vertical range that the vertical scrollbar represents.
`Boolean`	`dispatchKeyEvent(event: KeyEvent?)`
`Boolean`	`dispatchNestedFling(velocityX: Float, velocityY: Float, consumed: Boolean)`
`Boolean`	`dispatchNestedPreFling(velocityX: Float, velocityY: Float)`
`Boolean`	`dispatchNestedPreScroll( dx: Int, dy: Int, consumed: IntArray!, offsetInWindow: IntArray! )`
`Boolean`	`dispatchNestedPreScroll( dx: Int, dy: Int, consumed: IntArray!, offsetInWindow: IntArray!, type: Int )` Dispatch one step of a nested scroll in progress before this view consumes any portion of it.
`Boolean`	`dispatchNestedScroll( dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int, dyUnconsumed: Int, offsetInWindow: IntArray! )`
`Boolean`	`dispatchNestedScroll( dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int, dyUnconsumed: Int, offsetInWindow: IntArray!, type: Int )` Dispatch one step of a nested scroll in progress.
`Unit`	`dispatchNestedScroll( dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int, dyUnconsumed: Int, offsetInWindow: IntArray!, type: Int, consumed: IntArray )` Dispatch one step of a nested scroll in progress.
`Boolean`	`dispatchPopulateAccessibilityEvent(event: AccessibilityEvent!)`
`Unit`	`draw(c: Canvas)`
`Boolean`	`drawChild(canvas: Canvas, child: View!, drawingTime: Long)`
`View?`	`findChildViewUnder(x: Float, y: Float)` Find the topmost view under the given point.
`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 RecyclerView.
`RecyclerView.ViewHolder?`	`findContainingViewHolder(view: View)` Returns the ViewHolder that contains the given view.
`RecyclerView.ViewHolder?`	`findViewHolderForAdapterPosition(position: Int)` Return the ViewHolder for the item in the given position of the data set.
`RecyclerView.ViewHolder!`	`findViewHolderForItemId(id: Long)` Return the ViewHolder for the item with the given id.
`RecyclerView.ViewHolder?`	`findViewHolderForLayoutPosition(position: Int)` Return the ViewHolder for the item in the given position of the data set as of the latest layout pass.
`RecyclerView.ViewHolder?`	`findViewHolderForPosition(position: Int)` This function is deprecated. use `findViewHolderForLayoutPosition` or `findViewHolderForAdapterPosition`
`Boolean`	`fling(velocityX: Int, velocityY: Int)` Begin a standard fling with an initial velocity along each axis in pixels per second.
`View!`	`focusSearch(focused: View!, direction: Int)` Since RecyclerView is a collection ViewGroup that includes virtual children (items that are in the Adapter but not visible in the UI), it employs a more involved focus search strategy that differs from other ViewGroups.
`ViewGroup.LayoutParams!`	`generateLayoutParams(attrs: AttributeSet!)`
`CharSequence!`	`getAccessibilityClassName()`
`RecyclerView.Adapter?`	`getAdapter()` Retrieves the previously set adapter or null if no adapter is set.
`Int`	`getBaseline()` Return the offset of the RecyclerView's text baseline from the its top boundary.
`Int`	`getChildAdapterPosition(child: View)` Return the adapter position that the given child view corresponds to.
`Long`	`getChildItemId(child: View)` Return the stable item id that the given child view corresponds to.
`Int`	`getChildLayoutPosition(child: View)` Return the adapter position of the given child view as of the latest completed layout pass.
`Int`	`getChildPosition(child: View)` This function is deprecated. use `getChildAdapterPosition` or `getChildLayoutPosition`.
`RecyclerView.ViewHolder!`	`getChildViewHolder(child: View)` Retrieve the `ViewHolder` for the given child view.
`Boolean`	`getClipToPadding()` Returns whether this RecyclerView will clip its children to its padding, and resize (but not clip) any EdgeEffect to the padded region, if padding is present.
`RecyclerViewAccessibilityDelegate?`	`getCompatAccessibilityDelegate()` Returns the accessibility delegate compatibility implementation used by the RecyclerView.
`Unit`	`getDecoratedBoundsWithMargins(view: View, outBounds: Rect)` Returns the bounds of the view including its decoration and margins.
`RecyclerView.EdgeEffectFactory`	`getEdgeEffectFactory()` Retrieves the previously set `EdgeEffectFactory` or the default factory if nothing was set.
`RecyclerView.ItemAnimator?`	`getItemAnimator()` Gets the current ItemAnimator for this RecyclerView.
`RecyclerView.ItemDecoration`	`getItemDecorationAt(index: Int)` Returns an `ItemDecoration` previously added to this RecyclerView.
`Int`	`getItemDecorationCount()` Returns the number of `ItemDecoration` currently added to this RecyclerView.
`RecyclerView.LayoutManager?`	`getLayoutManager()` Return the `LayoutManager` currently responsible for layout policy for this RecyclerView.
`Int`	`getMaxFlingVelocity()` Returns the maximum fling velocity used by this RecyclerView.
`Int`	`getMinFlingVelocity()` Returns the minimum velocity to start a fling.
`RecyclerView.OnFlingListener?`	`getOnFlingListener()` Get the current `OnFlingListener` from this `RecyclerView`.
`Boolean`	`getPreserveFocusAfterLayout()` Returns true if the RecyclerView should attempt to preserve currently focused Adapter Item's focus even if the View representing the Item is replaced during a layout calculation.
`RecyclerView.RecycledViewPool`	`getRecycledViewPool()` Retrieve this RecyclerView's `RecycledViewPool`.
`Int`	`getScrollState()` Return the current scrolling state of the RecyclerView.
`Boolean`	`hasFixedSize()`
`Boolean`	`hasNestedScrollingParent()`
`Boolean`	`hasNestedScrollingParent(type: Int)` Returns true if this view has a nested scrolling parent for the given input type.
`Boolean`	`hasPendingAdapterUpdates()` Returns whether there are pending adapter updates which are not yet applied to the layout.
`Unit`	`invalidateItemDecorations()` Invalidates all ItemDecorations.
`Boolean`	`isAnimating()` Returns true if RecyclerView is currently running some animations.
`Boolean`	`isAttachedToWindow()` Returns true if RecyclerView is attached to window.
`Boolean`	`isComputingLayout()` Returns whether RecyclerView is currently computing a layout.
`Boolean`	`isLayoutFrozen()` This function is deprecated. Use `isLayoutSuppressed`.
`Boolean`	`isLayoutSuppressed()` Returns whether layout and scroll calls on this container are currently being suppressed, due to an earlier call to `suppressLayout`.
`Boolean`	`isNestedScrollingEnabled()`
`Unit`	`nestedScrollBy(x: Int, y: Int)` Same as `scrollBy`, but also participates in nested scrolling.
`Unit`	`offsetChildrenHorizontal(dx: @Px Int)` Offset the bounds of all child views by `dx` pixels.
`Unit`	`offsetChildrenVertical(dy: @Px Int)` Offset the bounds of all child views by `dy` pixels.
`Unit`	`onChildAttachedToWindow(child: View)` Called when an item view is attached to this RecyclerView.
`Unit`	`onChildDetachedFromWindow(child: View)` Called when an item view is detached from this RecyclerView.
`Unit`	`onDraw(c: Canvas)`
`Boolean`	`onGenericMotionEvent(event: MotionEvent!)`
`Boolean`	`onInterceptTouchEvent(e: MotionEvent!)`
`Unit`	`onScrollStateChanged(state: Int)` Called when the scroll state of this RecyclerView changes.
`Unit`	`onScrolled(dx: @Px Int, dy: @Px Int)` Called when the scroll position of this RecyclerView changes.
`Boolean`	`onTouchEvent(e: MotionEvent!)`
`Unit`	`removeItemDecoration(decor: RecyclerView.ItemDecoration)` Remove an `ItemDecoration` from this RecyclerView.
`Unit`	`removeItemDecorationAt(index: Int)` Removes the `ItemDecoration` associated with the supplied index position.
`Unit`	`removeOnChildAttachStateChangeListener( listener: RecyclerView.OnChildAttachStateChangeListener )` Removes the provided listener from child attached state listeners list.
`Unit`	`removeOnItemTouchListener(listener: RecyclerView.OnItemTouchListener)` Remove an `OnItemTouchListener`.
`Unit`	`removeOnScrollListener(listener: RecyclerView.OnScrollListener)` Remove a listener that was notified of any changes in scroll state or position.
`Unit`	`removeRecyclerListener(listener: RecyclerView.RecyclerListener)` Removes the provided listener from RecyclerListener list.
`Unit`	`requestChildFocus(child: View!, focused: View!)`
`Boolean`	`requestChildRectangleOnScreen(child: View!, rect: Rect!, immediate: Boolean)`
`Unit`	`requestDisallowInterceptTouchEvent(disallowIntercept: Boolean)`
`Unit`	`requestLayout()`
`Unit`	`scrollBy(x: Int, y: Int)`
`Unit`	`scrollTo(x: Int, y: Int)`
`Unit`	`scrollToPosition(position: Int)` Convenience method to scroll to a certain position.
`Unit`	`sendAccessibilityEventUnchecked(event: AccessibilityEvent!)`
`Unit`	`setAccessibilityDelegateCompat( accessibilityDelegate: RecyclerViewAccessibilityDelegate? )` Sets the accessibility delegate compatibility implementation used by RecyclerView.
`Unit`	`setAdapter(adapter: RecyclerView.Adapter?)` Set a new adapter to provide child views on demand.
`Unit`	`setChildDrawingOrderCallback( childDrawingOrderCallback: RecyclerView.ChildDrawingOrderCallback? )` Sets the `ChildDrawingOrderCallback` to be used for drawing children.
`Unit`	`setClipToPadding(clipToPadding: Boolean)`
`java-static Unit`	`setDebugAssertionsEnabled(debugAssertionsEnabled: Boolean)` Enable internal assertions about RecyclerView's state and throw exceptions if the assertions are violated.
`Unit`	`setEdgeEffectFactory(edgeEffectFactory: RecyclerView.EdgeEffectFactory)` Set a `EdgeEffectFactory` for this `RecyclerView`.
`Unit`	`setHasFixedSize(hasFixedSize: Boolean)` RecyclerView can perform several optimizations if it can know in advance that RecyclerView's size is not affected by the adapter contents.
`Unit`	`setItemAnimator(animator: RecyclerView.ItemAnimator?)` Sets the `ItemAnimator` that will handle animations involving changes to the items in this RecyclerView.
`Unit`	`setItemViewCacheSize(size: Int)` Set the number of offscreen views to retain before adding them to the potentially shared `recycled view pool`.
`Unit`	`setLayoutFrozen(frozen: Boolean)` This function is deprecated. Use `suppressLayout`.
`Unit`	`setLayoutManager(layout: RecyclerView.LayoutManager?)` Set the `LayoutManager` that this RecyclerView will use.
`Unit`	`setLayoutTransition(transition: LayoutTransition!)` This function is deprecated. Use `setItemAnimator` ()}.
`Unit`	`setNestedScrollingEnabled(enabled: Boolean)`
`Unit`	`setOnFlingListener(onFlingListener: RecyclerView.OnFlingListener?)` Set a `OnFlingListener` for this `RecyclerView`.
`Unit`	`setOnScrollListener(listener: RecyclerView.OnScrollListener?)` This function is deprecated. Use `addOnScrollListener` and `removeOnScrollListener`
`Unit`	`setPreserveFocusAfterLayout(preserveFocusAfterLayout: Boolean)` Set whether the RecyclerView should try to keep the same Item focused after a layout calculation or not.
`Unit`	`setRecycledViewPool(pool: RecyclerView.RecycledViewPool?)` Recycled view pools allow multiple RecyclerViews to share a common pool of scrap views.
`Unit`	`setRecyclerListener(listener: RecyclerView.RecyclerListener?)` This function is deprecated. Use `addRecyclerListener` and `removeRecyclerListener`
`Unit`	`setScrollingTouchSlop(slopConstant: Int)` Configure the scrolling touch slop for a specific use case.
`java-static Unit`	`setVerboseLoggingEnabled(verboseLoggingEnabled: Boolean)` Enable verbose logging within RecyclerView itself.
`Unit`	`setViewCacheExtension(extension: RecyclerView.ViewCacheExtension?)` Sets a new `ViewCacheExtension` to be used by the Recycler.
`Unit`	`smoothScrollBy(dx: @Px Int, dy: @Px Int)` Animate a scroll by the given amount of pixels along either axis.
`Unit`	`smoothScrollBy(dx: @Px Int, dy: @Px Int, interpolator: Interpolator?)` Animate a scroll by the given amount of pixels along either axis.
`Unit`	`smoothScrollBy( dx: @Px Int, dy: @Px Int, interpolator: Interpolator?, duration: Int )` Smooth scrolls the RecyclerView by a given distance.
`Unit`	`smoothScrollToPosition(position: Int)` Starts a smooth scroll to an adapter position.
`Boolean`	`startNestedScroll(axes: Int)`
`Boolean`	`startNestedScroll(axes: Int, type: Int)` Begin a nestable scroll operation along the given axes, for the given input type.
`Unit`	`stopNestedScroll()`
`Unit`	`stopNestedScroll(type: Int)` Stop a nested scroll in progress for the given input type.
`Unit`	`stopScroll()` Stop any current scroll in progress, such as one started by `smoothScrollBy`, `fling` or a touch-initiated fling.
`Unit`	`suppressLayout(suppress: Boolean)` Tells this RecyclerView to suppress all layout and scroll calls until layout suppression is disabled with a later call to suppressLayout(false).
`Unit`	`swapAdapter( adapter: RecyclerView.Adapter?, removeAndRecycleExistingViews: Boolean )` Swaps the current adapter with the provided one.

Protected functions
`Boolean`	`checkLayoutParams(p: ViewGroup.LayoutParams!)`
`Unit`	`dispatchRestoreInstanceState(container: SparseArray<Parcelable!>!)` Override to prevent thawing of any views created by the adapter.
`Unit`	`dispatchSaveInstanceState(container: SparseArray<Parcelable!>!)` Override to prevent freezing of any views created by the adapter.
`ViewGroup.LayoutParams!`	`generateDefaultLayoutParams()`
`ViewGroup.LayoutParams!`	`generateLayoutParams(p: ViewGroup.LayoutParams!)`
`Int`	`getChildDrawingOrder(childCount: Int, i: Int)`
`Unit`	`onAttachedToWindow()`
`Unit`	`onDetachedFromWindow()`
`Unit`	`onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int)`
`Unit`	`onMeasure(widthSpec: Int, heightSpec: Int)`
`Boolean`	`onRequestFocusInDescendants(direction: Int, previouslyFocusedRect: Rect!)`
`Unit`	`onRestoreInstanceState(state: Parcelable!)`
`Parcelable!`	`onSaveInstanceState()`
`Unit`	`onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int)`
`Unit`	`removeDetachedView(child: View!, animate: Boolean)`

Inherited Constants

From android.view.View

`const Int`	`ACCESSIBILITY_DATA_SENSITIVE_AUTO = 0`
`const Int`	`ACCESSIBILITY_DATA_SENSITIVE_NO = 2`
`const Int`	`ACCESSIBILITY_DATA_SENSITIVE_YES = 1`
`const Int`	`ACCESSIBILITY_LIVE_REGION_ASSERTIVE = 2`
`const Int`	`ACCESSIBILITY_LIVE_REGION_NONE = 0`
`const Int`	`ACCESSIBILITY_LIVE_REGION_POLITE = 1`
`const Property<View!, Float!>!`	`ALPHA`
`const Int`	`AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS = 1`
`const String!`	`AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DATE = "creditCardExpirationDate"`
`const String!`	`AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DAY = "creditCardExpirationDay"`
`const String!`	`AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_MONTH = "creditCardExpirationMonth"`
`const String!`	`AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_YEAR = "creditCardExpirationYear"`
`const String!`	`AUTOFILL_HINT_CREDIT_CARD_NUMBER = "creditCardNumber"`
`const String!`	`AUTOFILL_HINT_CREDIT_CARD_SECURITY_CODE = "creditCardSecurityCode"`
`const String!`	`AUTOFILL_HINT_EMAIL_ADDRESS = "emailAddress"`
`const String!`	`AUTOFILL_HINT_NAME = "name"`
`const String!`	`AUTOFILL_HINT_PASSWORD = "password"`
`const String!`	`AUTOFILL_HINT_PHONE = "phone"`
`const String!`	`AUTOFILL_HINT_POSTAL_ADDRESS = "postalAddress"`
`const String!`	`AUTOFILL_HINT_POSTAL_CODE = "postalCode"`
`const String!`	`AUTOFILL_HINT_USERNAME = "username"`
`const Int`	`AUTOFILL_TYPE_DATE = 4`
`const Int`	`AUTOFILL_TYPE_LIST = 3`
`const Int`	`AUTOFILL_TYPE_NONE = 0`
`const Int`	`AUTOFILL_TYPE_TEXT = 1`
`const Int`	`AUTOFILL_TYPE_TOGGLE = 2`
`const Int`	`DRAG_FLAG_ACCESSIBILITY_ACTION = 1024`
`const Int`	`DRAG_FLAG_GLOBAL = 256`
`const Int`	`DRAG_FLAG_GLOBAL_PERSISTABLE_URI_PERMISSION = 64`
`const Int`	`DRAG_FLAG_GLOBAL_PREFIX_URI_PERMISSION = 128`
`const Int`	`DRAG_FLAG_GLOBAL_URI_READ = 1`
`const Int`	`DRAG_FLAG_GLOBAL_URI_WRITE = 2`
`const Int`	`DRAG_FLAG_OPAQUE = 512`
`const Int`	`DRAWING_CACHE_QUALITY_AUTO = 0` This property is deprecated.
`const Int`	`DRAWING_CACHE_QUALITY_HIGH = 1048576` This property is deprecated.
`const Int`	`DRAWING_CACHE_QUALITY_LOW = 524288` This property is deprecated.
`const IntArray<Int>!`	`EMPTY_STATE_SET`
`const IntArray<Int>!`	`ENABLED_FOCUSED_SELECTED_STATE_SET`
`const IntArray<Int>!`	`ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`ENABLED_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`ENABLED_SELECTED_STATE_SET`
`const IntArray<Int>!`	`ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`ENABLED_STATE_SET`
`const IntArray<Int>!`	`ENABLED_WINDOW_FOCUSED_STATE_SET`
`const Int`	`FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 2`
`const Int`	`FIND_VIEWS_WITH_TEXT = 1`
`const Int`	`FOCUSABLE = 1`
`const Int`	`FOCUSABLES_ALL = 0`
`const Int`	`FOCUSABLES_TOUCH_MODE = 1`
`const Int`	`FOCUSABLE_AUTO = 16`
`const IntArray<Int>!`	`FOCUSED_SELECTED_STATE_SET`
`const IntArray<Int>!`	`FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`FOCUSED_STATE_SET`
`const IntArray<Int>!`	`FOCUSED_WINDOW_FOCUSED_STATE_SET`
`const Int`	`FOCUS_BACKWARD = 1`
`const Int`	`FOCUS_DOWN = 130`
`const Int`	`FOCUS_FORWARD = 2`
`const Int`	`FOCUS_LEFT = 17`
`const Int`	`FOCUS_RIGHT = 66`
`const Int`	`FOCUS_UP = 33`
`const Int`	`GONE = 8`
`const Int`	`HAPTIC_FEEDBACK_ENABLED = 268435456`
`const Int`	`IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0`
`const Int`	`IMPORTANT_FOR_ACCESSIBILITY_NO = 2`
`const Int`	`IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS = 4`
`const Int`	`IMPORTANT_FOR_ACCESSIBILITY_YES = 1`
`const Int`	`IMPORTANT_FOR_AUTOFILL_AUTO = 0`
`const Int`	`IMPORTANT_FOR_AUTOFILL_NO = 2`
`const Int`	`IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS = 8`
`const Int`	`IMPORTANT_FOR_AUTOFILL_YES = 1`
`const Int`	`IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS = 4`
`const Int`	`IMPORTANT_FOR_CONTENT_CAPTURE_AUTO = 0`
`const Int`	`IMPORTANT_FOR_CONTENT_CAPTURE_NO = 2`
`const Int`	`IMPORTANT_FOR_CONTENT_CAPTURE_NO_EXCLUDE_DESCENDANTS = 8`
`const Int`	`IMPORTANT_FOR_CONTENT_CAPTURE_YES = 1`
`const Int`	`IMPORTANT_FOR_CONTENT_CAPTURE_YES_EXCLUDE_DESCENDANTS = 4`
`const Int`	`INVISIBLE = 4`
`const Int`	`KEEP_SCREEN_ON = 67108864`
`const Int`	`LAYER_TYPE_HARDWARE = 2`
`const Int`	`LAYER_TYPE_NONE = 0`
`const Int`	`LAYER_TYPE_SOFTWARE = 1`
`const Int`	`LAYOUT_DIRECTION_INHERIT = 2`
`const Int`	`LAYOUT_DIRECTION_LOCALE = 3`
`const Int`	`LAYOUT_DIRECTION_LTR = 0`
`const Int`	`LAYOUT_DIRECTION_RTL = 1`
`const Int`	`MEASURED_HEIGHT_STATE_SHIFT = 16`
`const Int`	`MEASURED_SIZE_MASK = 16777215`
`const Int`	`MEASURED_STATE_MASK = -16777216`
`const Int`	`MEASURED_STATE_TOO_SMALL = 16777216`
`const Int`	`NOT_FOCUSABLE = 0`
`const Int`	`NO_ID = -1`
`const Int`	`OVER_SCROLL_ALWAYS = 0`
`const Int`	`OVER_SCROLL_IF_CONTENT_SCROLLS = 1`
`const Int`	`OVER_SCROLL_NEVER = 2`
`const IntArray<Int>!`	`PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_ENABLED_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_ENABLED_SELECTED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_ENABLED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_FOCUSED_SELECTED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_SELECTED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_STATE_SET`
`const IntArray<Int>!`	`PRESSED_WINDOW_FOCUSED_STATE_SET`
`const Property<View!, Float!>!`	`ROTATION`
`const Property<View!, Float!>!`	`ROTATION_X`
`const Property<View!, Float!>!`	`ROTATION_Y`
`const Property<View!, Float!>!`	`SCALE_X`
`const Property<View!, Float!>!`	`SCALE_Y`
`const Int`	`SCREEN_STATE_OFF = 0`
`const Int`	`SCREEN_STATE_ON = 1`
`const Int`	`SCROLLBARS_INSIDE_INSET = 16777216`
`const Int`	`SCROLLBARS_INSIDE_OVERLAY = 0`
`const Int`	`SCROLLBARS_OUTSIDE_INSET = 50331648`
`const Int`	`SCROLLBARS_OUTSIDE_OVERLAY = 33554432`
`const Int`	`SCROLLBAR_POSITION_DEFAULT = 0`
`const Int`	`SCROLLBAR_POSITION_LEFT = 1`
`const Int`	`SCROLLBAR_POSITION_RIGHT = 2`
`const Int`	`SCROLL_AXIS_HORIZONTAL = 1`
`const Int`	`SCROLL_AXIS_NONE = 0`
`const Int`	`SCROLL_AXIS_VERTICAL = 2`
`const Int`	`SCROLL_CAPTURE_HINT_AUTO = 0`
`const Int`	`SCROLL_CAPTURE_HINT_EXCLUDE = 1`
`const Int`	`SCROLL_CAPTURE_HINT_EXCLUDE_DESCENDANTS = 4`
`const Int`	`SCROLL_CAPTURE_HINT_INCLUDE = 2`
`const Int`	`SCROLL_INDICATOR_BOTTOM = 2`
`const Int`	`SCROLL_INDICATOR_END = 32`
`const Int`	`SCROLL_INDICATOR_LEFT = 4`
`const Int`	`SCROLL_INDICATOR_RIGHT = 8`
`const Int`	`SCROLL_INDICATOR_START = 16`
`const Int`	`SCROLL_INDICATOR_TOP = 1`
`const IntArray<Int>!`	`SELECTED_STATE_SET`
`const IntArray<Int>!`	`SELECTED_WINDOW_FOCUSED_STATE_SET`
`const Int`	`SOUND_EFFECTS_ENABLED = 134217728`
`const Int`	`STATUS_BAR_HIDDEN = 1` This property is deprecated.
`const Int`	`STATUS_BAR_VISIBLE = 0` This property is deprecated.
`const Int`	`SYSTEM_UI_FLAG_FULLSCREEN = 4` This property is deprecated.
`const Int`	`SYSTEM_UI_FLAG_HIDE_NAVIGATION = 2` This property is deprecated.
`const Int`	`SYSTEM_UI_FLAG_IMMERSIVE = 2048` This property is deprecated.
`const Int`	`SYSTEM_UI_FLAG_IMMERSIVE_STICKY = 4096` This property is deprecated.
`const Int`	`SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 1024` This property is deprecated.
`const Int`	`SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 512` This property is deprecated.
`const Int`	`SYSTEM_UI_FLAG_LAYOUT_STABLE = 256` This property is deprecated.
`const Int`	`SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR = 16` This property is deprecated.
`const Int`	`SYSTEM_UI_FLAG_LIGHT_STATUS_BAR = 8192` This property is deprecated.
`const Int`	`SYSTEM_UI_FLAG_LOW_PROFILE = 1` This property is deprecated.
`const Int`	`SYSTEM_UI_FLAG_VISIBLE = 0` This property is deprecated.
`const Int`	`SYSTEM_UI_LAYOUT_FLAGS = 1536` This property is deprecated.
`const Int`	`TEXT_ALIGNMENT_CENTER = 4`
`const Int`	`TEXT_ALIGNMENT_GRAVITY = 1`
`const Int`	`TEXT_ALIGNMENT_INHERIT = 0`
`const Int`	`TEXT_ALIGNMENT_TEXT_END = 3`
`const Int`	`TEXT_ALIGNMENT_TEXT_START = 2`
`const Int`	`TEXT_ALIGNMENT_VIEW_END = 6`
`const Int`	`TEXT_ALIGNMENT_VIEW_START = 5`
`const Int`	`TEXT_DIRECTION_ANY_RTL = 2`
`const Int`	`TEXT_DIRECTION_FIRST_STRONG = 1`
`const Int`	`TEXT_DIRECTION_FIRST_STRONG_LTR = 6`
`const Int`	`TEXT_DIRECTION_FIRST_STRONG_RTL = 7`
`const Int`	`TEXT_DIRECTION_INHERIT = 0`
`const Int`	`TEXT_DIRECTION_LOCALE = 5`
`const Int`	`TEXT_DIRECTION_LTR = 3`
`const Int`	`TEXT_DIRECTION_RTL = 4`
`const Property<View!, Float!>!`	`TRANSLATION_X`
`const Property<View!, Float!>!`	`TRANSLATION_Y`
`const Property<View!, Float!>!`	`TRANSLATION_Z`
`const String!`	`VIEW_LOG_TAG = "View"`
`const Int`	`VISIBLE = 0`
`const IntArray<Int>!`	`WINDOW_FOCUSED_STATE_SET`
`const Property<View!, Float!>!`	`X`
`const Property<View!, Float!>!`	`Y`
`const Property<View!, Float!>!`	`Z`

From android.view.ViewGroup

`const Int`	`CLIP_TO_PADDING_MASK = 34`
`const Int`	`FOCUS_AFTER_DESCENDANTS = 262144`
`const Int`	`FOCUS_BEFORE_DESCENDANTS = 131072`
`const Int`	`FOCUS_BLOCK_DESCENDANTS = 393216`
`const Int`	`LAYOUT_MODE_CLIP_BOUNDS = 0`
`const Int`	`LAYOUT_MODE_OPTICAL_BOUNDS = 1`
`const Int`	`PERSISTENT_ALL_CACHES = 3` This property is deprecated.
`const Int`	`PERSISTENT_ANIMATION_CACHE = 1` This property is deprecated.
`const Int`	`PERSISTENT_NO_CACHE = 0` This property is deprecated.
`const Int`	`PERSISTENT_SCROLLING_CACHE = 2` This property is deprecated.

Inherited functions

From android.view.View

`Unit`	`addOnAttachStateChangeListener( listener: View.OnAttachStateChangeListener! )`
`Unit`	`addOnLayoutChangeListener(listener: View.OnLayoutChangeListener!)`
`Unit`	`addOnUnhandledKeyEventListener( listener: View.OnUnhandledKeyEventListener! )`
`ViewPropertyAnimator!`	`animate()`
`Unit`	`announceForAccessibility(text: CharSequence!)`
`Unit`	`autofill(value: AutofillValue!)`
`Boolean`	`awakenScrollBars()`
`Unit`	`bringToFront()`
`Unit`	`buildDrawingCache()` This function is deprecated.
`Unit`	`buildLayer()`
`Boolean`	`callOnClick()`
`Boolean`	`canResolveLayoutDirection()`
`Boolean`	`canResolveTextAlignment()`
`Boolean`	`canResolveTextDirection()`
`Boolean`	`canScrollHorizontally(direction: Int)`
`Boolean`	`canScrollVertically(direction: Int)`
`Unit`	`cancelDragAndDrop()`
`Unit`	`cancelLongPress()`
`Unit`	`cancelPendingInputEvents()`
`Boolean`	`checkInputConnectionProxy(view: View!)`
`Unit`	`clearAnimation()`
`Unit`	`clearViewTranslationCallback()`
`java-static Int`	`combineMeasuredStates(curState: Int, newState: Int)`
`Unit`	`computeScroll()`
`WindowInsets!`	`computeSystemWindowInsets(in: WindowInsets!, outLocalInsets: Rect!)`
`AccessibilityNodeInfo!`	`createAccessibilityNodeInfo()`
`Unit`	`createContextMenu(menu: ContextMenu!)`
`Unit`	`destroyDrawingCache()` This function is deprecated.
`Boolean`	`dispatchGenericMotionEvent(event: MotionEvent!)`
`Boolean`	`dispatchNestedPrePerformAccessibilityAction( action: Int, arguments: Bundle! )`
`Unit`	`drawableHotspotChanged(x: Float, y: Float)`
`OnBackInvokedDispatcher!`	`findOnBackInvokedDispatcher()`
`T!`	`<T : View?> findViewById(id: Int)`
`T!`	`<T : View?> findViewWithTag(tag: Any!)`
`Boolean`	`fitSystemWindows(insets: Rect!)` This function is deprecated.
`Unit`	`forceHasOverlappingRendering(hasOverlappingRendering: Boolean)`
`Unit`	`forceLayout()`
`Unit`	`generateDisplayHash( hashAlgorithm: String!, bounds: Rect!, executor: Executor!, callback: DisplayHashResultCallback! )`
`java-static Int`	`generateViewId()`
`View.AccessibilityDelegate!`	`getAccessibilityDelegate()`
`Int`	`getAccessibilityLiveRegion()`
`AccessibilityNodeProvider!`	`getAccessibilityNodeProvider()`
`CharSequence!`	`getAccessibilityPaneTitle()`
`Int`	`getAccessibilityTraversalAfter()`
`Int`	`getAccessibilityTraversalBefore()`
`String!`	`getAllowedHandwritingDelegatePackageName()`
`String!`	`getAllowedHandwritingDelegatorPackageName()`
`Float`	`getAlpha()`
`Animation!`	`getAnimation()`
`Matrix!`	`getAnimationMatrix()`
`IBinder!`	`getApplicationWindowToken()`
`IntArray<Int>!`	`getAttributeResolutionStack(attribute: Int)`
`(Mutable)Map<Int!, Int!>!`	`getAttributeSourceResourceMap()`
`Array<String!>!`	`getAutofillHints()`
`AutofillId!`	`getAutofillId()`
`Int`	`getAutofillType()`
`AutofillValue!`	`getAutofillValue()`
`Drawable!`	`getBackground()`
`BlendMode!`	`getBackgroundTintBlendMode()`
`ColorStateList!`	`getBackgroundTintList()`
`PorterDuff.Mode!`	`getBackgroundTintMode()`
`Int`	`getBottom()`
`Float`	`getBottomFadingEdgeStrength()`
`Int`	`getBottomPaddingOffset()`
`Float`	`getCameraDistance()`
`Rect!`	`getClipBounds()`
`Boolean`	`getClipBounds(outRect: Rect!)`
`Boolean`	`getClipToOutline()`
`ContentCaptureSession!`	`getContentCaptureSession()`
`CharSequence!`	`getContentDescription()`
`Context!`	`getContext()`
`ContextMenu.ContextMenuInfo!`	`getContextMenuInfo()`
`Boolean`	`getDefaultFocusHighlightEnabled()`
`java-static Int`	`getDefaultSize(size: Int, measureSpec: Int)`
`Display!`	`getDisplay()`
`IntArray<Int>!`	`getDrawableState()`
`Bitmap!`	`getDrawingCache()` This function is deprecated.
`Int`	`getDrawingCacheBackgroundColor()` This function is deprecated.
`Int`	`getDrawingCacheQuality()` This function is deprecated.
`Unit`	`getDrawingRect(outRect: Rect!)`
`Long`	`getDrawingTime()`
`Float`	`getElevation()`
`Int`	`getExplicitStyle()`
`Boolean`	`getFilterTouchesWhenObscured()`
`Boolean`	`getFitsSystemWindows()`
`Int`	`getFocusable()`
`ArrayList<View!>!`	`getFocusables(direction: Int)`
`Unit`	`getFocusedRect(r: Rect!)`
`Drawable!`	`getForeground()`
`Int`	`getForegroundGravity()`
`BlendMode!`	`getForegroundTintBlendMode()`
`ColorStateList!`	`getForegroundTintList()`
`PorterDuff.Mode!`	`getForegroundTintMode()`
`Boolean`	`getGlobalVisibleRect(r: Rect!, globalOffset: Point!)`
`Handler!`	`getHandler()`
`Float`	`getHandwritingBoundsOffsetBottom()`
`Float`	`getHandwritingBoundsOffsetLeft()`
`Float`	`getHandwritingBoundsOffsetRight()`
`Float`	`getHandwritingBoundsOffsetTop()`
`Runnable!`	`getHandwritingDelegatorCallback()`
`Boolean`	`getHasOverlappingRendering()`
`Int`	`getHeight()`
`Unit`	`getHitRect(outRect: Rect!)`
`Int`	`getHorizontalFadingEdgeLength()`
`Int`	`getHorizontalScrollbarHeight()`
`Drawable!`	`getHorizontalScrollbarThumbDrawable()`
`Drawable!`	`getHorizontalScrollbarTrackDrawable()`
`Int`	`getId()`
`Int`	`getImportantForAccessibility()`
`Int`	`getImportantForAutofill()`
`Int`	`getImportantForContentCapture()`
`Boolean`	`getKeepScreenOn()`
`KeyEvent.DispatcherState!`	`getKeyDispatcherState()`
`Int`	`getLabelFor()`
`Int`	`getLayerType()`
`Int`	`getLayoutDirection()`
`ViewGroup.LayoutParams!`	`getLayoutParams()`
`Int`	`getLeft()`
`Float`	`getLeftFadingEdgeStrength()`
`Int`	`getLeftPaddingOffset()`
`Boolean`	`getLocalVisibleRect(r: Rect!)`
`Unit`	`getLocationInSurface(location: IntArray!)`
`Unit`	`getLocationInWindow(outLocation: IntArray!)`
`Unit`	`getLocationOnScreen(outLocation: IntArray!)`
`Matrix!`	`getMatrix()`
`Int`	`getMeasuredHeight()`
`Int`	`getMeasuredHeightAndState()`
`Int`	`getMeasuredState()`
`Int`	`getMeasuredWidth()`
`Int`	`getMeasuredWidthAndState()`
`Int`	`getMinimumHeight()`
`Int`	`getMinimumWidth()`
`Int`	`getNextClusterForwardId()`
`Int`	`getNextFocusDownId()`
`Int`	`getNextFocusForwardId()`
`Int`	`getNextFocusLeftId()`
`Int`	`getNextFocusRightId()`
`Int`	`getNextFocusUpId()`
`View.OnFocusChangeListener!`	`getOnFocusChangeListener()`
`Int`	`getOutlineAmbientShadowColor()`
`ViewOutlineProvider!`	`getOutlineProvider()`
`Int`	`getOutlineSpotShadowColor()`
`Int`	`getOverScrollMode()`
`ViewOverlay!`	`getOverlay()`
`Int`	`getPaddingBottom()`
`Int`	`getPaddingEnd()`
`Int`	`getPaddingLeft()`
`Int`	`getPaddingRight()`
`Int`	`getPaddingStart()`
`Int`	`getPaddingTop()`
`ViewParent!`	`getParent()`
`ViewParent!`	`getParentForAccessibility()`
`Float`	`getPivotX()`
`Float`	`getPivotY()`
`PointerIcon!`	`getPointerIcon()`
`(Mutable)List<Rect!>!`	`getPreferKeepClearRects()`
`Array<String!>!`	`getReceiveContentMimeTypes()`
`Resources!`	`getResources()`
`Boolean`	`getRevealOnFocusHint()`
`Int`	`getRight()`
`Float`	`getRightFadingEdgeStrength()`
`Int`	`getRightPaddingOffset()`
`AttachedSurfaceControl!`	`getRootSurfaceControl()`
`View!`	`getRootView()`
`WindowInsets!`	`getRootWindowInsets()`
`Float`	`getRotation()`
`Float`	`getRotationX()`
`Float`	`getRotationY()`
`Float`	`getScaleX()`
`Float`	`getScaleY()`
`Int`	`getScrollBarDefaultDelayBeforeFade()`
`Int`	`getScrollBarFadeDuration()`
`Int`	`getScrollBarSize()`
`Int`	`getScrollBarStyle()`
`Int`	`getScrollCaptureHint()`
`Int`	`getScrollIndicators()`
`Int`	`getScrollX()`
`Int`	`getScrollY()`
`Int`	`getSolidColor()`
`Int`	`getSourceLayoutResId()`
`CharSequence!`	`getStateDescription()`
`StateListAnimator!`	`getStateListAnimator()`
`Int`	`getSuggestedMinimumHeight()`
`Int`	`getSuggestedMinimumWidth()`
`(Mutable)List<Rect!>!`	`getSystemGestureExclusionRects()`
`Int`	`getSystemUiVisibility()` This function is deprecated.
`Any!`	`getTag()`
`Int`	`getTextAlignment()`
`Int`	`getTextDirection()`
`CharSequence!`	`getTooltipText()`
`Int`	`getTop()`
`Float`	`getTopFadingEdgeStrength()`
`Int`	`getTopPaddingOffset()`
`TouchDelegate!`	`getTouchDelegate()`
`ArrayList<View!>!`	`getTouchables()`
`Float`	`getTransitionAlpha()`
`String!`	`getTransitionName()`
`Float`	`getTranslationX()`
`Float`	`getTranslationY()`
`Float`	`getTranslationZ()`
`Long`	`getUniqueDrawingId()`
`Int`	`getVerticalFadingEdgeLength()`
`Int`	`getVerticalScrollbarPosition()`
`Drawable!`	`getVerticalScrollbarThumbDrawable()`
`Drawable!`	`getVerticalScrollbarTrackDrawable()`
`Int`	`getVerticalScrollbarWidth()`
`ViewTranslationResponse!`	`getViewTranslationResponse()`
`ViewTreeObserver!`	`getViewTreeObserver()`
`Int`	`getVisibility()`
`Int`	`getWidth()`
`Int`	`getWindowAttachCount()`
`WindowId!`	`getWindowId()`
`WindowInsetsController!`	`getWindowInsetsController()`
`Int`	`getWindowSystemUiVisibility()` This function is deprecated.
`IBinder!`	`getWindowToken()`
`Int`	`getWindowVisibility()`
`Unit`	`getWindowVisibleDisplayFrame(outRect: Rect!)`
`Float`	`getX()`
`Float`	`getY()`
`Float`	`getZ()`
`Boolean`	`hasExplicitFocusable()`
`Boolean`	`hasFocusable()`
`Boolean`	`hasOnClickListeners()`
`Boolean`	`hasOnLongClickListeners()`
`Boolean`	`hasOverlappingRendering()`
`Boolean`	`hasPointerCapture()`
`Boolean`	`hasWindowFocus()`
`java-static View!`	`inflate(context: Context!, resource: Int, root: ViewGroup!)`
`Unit`	`invalidate(dirty: Rect!)` This function is deprecated.
`Unit`	`invalidateDrawable(drawable: Drawable!)`
`Unit`	`invalidateOutline()`
`Boolean`	`isAccessibilityDataSensitive()`
`Boolean`	`isAccessibilityFocused()`
`Boolean`	`isAccessibilityHeading()`
`Boolean`	`isActivated()`
`Boolean`	`isAutoHandwritingEnabled()`
`Boolean`	`isClickable()`
`Boolean`	`isContextClickable()`
`Boolean`	`isCredential()`
`Boolean`	`isDirty()`
`Boolean`	`isDrawingCacheEnabled()` This function is deprecated.
`Boolean`	`isDuplicateParentStateEnabled()`
`Boolean`	`isEnabled()`
`Boolean`	`isFocusable()`
`Boolean`	`isFocusableInTouchMode()`
`Boolean`	`isFocused()`
`Boolean`	`isFocusedByDefault()`
`Boolean`	`isForceDarkAllowed()`
`Boolean`	`isHandwritingDelegate()`
`Boolean`	`isHapticFeedbackEnabled()`
`Boolean`	`isHardwareAccelerated()`
`Boolean`	`isHorizontalFadingEdgeEnabled()`
`Boolean`	`isHorizontalScrollBarEnabled()`
`Boolean`	`isHovered()`
`Boolean`	`isImportantForAccessibility()`
`Boolean`	`isImportantForAutofill()`
`Boolean`	`isImportantForContentCapture()`
`Boolean`	`isInEditMode()`
`Boolean`	`isInLayout()`
`Boolean`	`isInTouchMode()`
`Boolean`	`isKeyboardNavigationCluster()`
`Boolean`	`isLaidOut()`
`Boolean`	`isLayoutDirectionResolved()`
`Boolean`	`isLayoutRequested()`
`Boolean`	`isLongClickable()`
`Boolean`	`isOpaque()`
`Boolean`	`isPaddingOffsetRequired()`
`Boolean`	`isPaddingRelative()`
`Boolean`	`isPivotSet()`
`Boolean`	`isPreferKeepClear()`
`Boolean`	`isPressed()`
`Boolean`	`isSaveEnabled()`
`Boolean`	`isSaveFromParentEnabled()`
`Boolean`	`isScreenReaderFocusable()`
`Boolean`	`isScrollContainer()`
`Boolean`	`isScrollbarFadingEnabled()`
`Boolean`	`isSelected()`
`Boolean`	`isShowingLayoutBounds()`
`Boolean`	`isShown()`
`Boolean`	`isSoundEffectsEnabled()`
`Boolean`	`isTemporarilyDetached()`
`Boolean`	`isTextAlignmentResolved()`
`Boolean`	`isTextDirectionResolved()`
`Boolean`	`isVerticalFadingEdgeEnabled()`
`Boolean`	`isVerticalScrollBarEnabled()`
`Boolean`	`isVisibleToUserForAutofill(virtualId: Int)`
`View!`	`keyboardNavigationClusterSearch(currentCluster: View!, direction: Int)`
`Unit`	`measure(widthMeasureSpec: Int, heightMeasureSpec: Int)`
`java-static IntArray<Int>!`	`mergeDrawableStates(baseState: IntArray!, additionalState: IntArray!)`
`Unit`	`offsetLeftAndRight(offset: Int)`
`Unit`	`offsetTopAndBottom(offset: Int)`
`Unit`	`onAnimationEnd()`
`Unit`	`onAnimationStart()`
`WindowInsets!`	`onApplyWindowInsets(insets: WindowInsets!)`
`Unit`	`onCancelPendingInputEvents()`
`Boolean`	`onCapturedPointerEvent(event: MotionEvent!)`
`Boolean`	`onCheckIsTextEditor()`
`Unit`	`onConfigurationChanged(newConfig: Configuration!)`
`Unit`	`onCreateContextMenu(menu: ContextMenu!)`
`InputConnection!`	`onCreateInputConnection(outAttrs: EditorInfo!)`
`Unit`	`onCreateViewTranslationRequest( supportedFormats: IntArray!, requestsCollector: Consumer<ViewTranslationRequest!>! )`
`Unit`	`onCreateVirtualViewTranslationRequests( virtualIds: LongArray!, supportedFormats: IntArray!, requestsCollector: Consumer<ViewTranslationRequest!>! )`
`Unit`	`onDisplayHint(hint: Int)`
`Boolean`	`onDragEvent(event: DragEvent!)`
`Unit`	`onDrawForeground(canvas: Canvas!)`
`Unit`	`onDrawScrollBars(canvas: Canvas!)`
`Boolean`	`onFilterTouchEventForSecurity(event: MotionEvent!)`
`Unit`	`onFinishInflate()`
`Unit`	`onFinishTemporaryDetach()`
`Unit`	`onFocusChanged( gainFocus: Boolean, direction: Int, previouslyFocusedRect: Rect! )`
`Unit`	`onHoverChanged(hovered: Boolean)`
`Boolean`	`onHoverEvent(event: MotionEvent!)`
`Unit`	`onInitializeAccessibilityEvent(event: AccessibilityEvent!)`
`Unit`	`onInitializeAccessibilityNodeInfo(info: AccessibilityNodeInfo!)`
`Boolean`	`onKeyDown(keyCode: Int, event: KeyEvent!)`
`Boolean`	`onKeyLongPress(keyCode: Int, event: KeyEvent!)`
`Boolean`	`onKeyMultiple(keyCode: Int, repeatCount: Int, event: KeyEvent!)`
`Boolean`	`onKeyPreIme(keyCode: Int, event: KeyEvent!)`
`Boolean`	`onKeyShortcut(keyCode: Int, event: KeyEvent!)`
`Boolean`	`onKeyUp(keyCode: Int, event: KeyEvent!)`
`Unit`	`onOverScrolled( scrollX: Int, scrollY: Int, clampedX: Boolean, clampedY: Boolean )`
`Unit`	`onPointerCaptureChange(hasCapture: Boolean)`
`Unit`	`onPopulateAccessibilityEvent(event: AccessibilityEvent!)`
`Unit`	`onProvideAutofillStructure(structure: ViewStructure!, flags: Int)`
`Unit`	`onProvideAutofillVirtualStructure(structure: ViewStructure!, flags: Int)`
`Unit`	`onProvideContentCaptureStructure(structure: ViewStructure!, flags: Int)`
`Unit`	`onProvideStructure(structure: ViewStructure!)`
`Unit`	`onProvideVirtualStructure(structure: ViewStructure!)`
`ContentInfo!`	`onReceiveContent(payload: ContentInfo!)`
`Unit`	`onRtlPropertiesChanged(layoutDirection: Int)`
`Unit`	`onScreenStateChanged(screenState: Int)`
`Unit`	`onScrollCaptureSearch( localVisibleRect: Rect!, windowOffset: Point!, targets: Consumer<ScrollCaptureTarget!>! )`
`Unit`	`onScrollChanged(l: Int, t: Int, oldl: Int, oldt: Int)`
`Boolean`	`onSetAlpha(alpha: Int)`
`Unit`	`onStartTemporaryDetach()`
`Boolean`	`onTrackballEvent(event: MotionEvent!)`
`Unit`	`onViewTranslationResponse(response: ViewTranslationResponse!)`
`Unit`	`onVirtualViewTranslationResponses( response: LongSparseArray<ViewTranslationResponse!>! )`
`Unit`	`onVisibilityAggregated(isVisible: Boolean)`
`Unit`	`onVisibilityChanged(changedView: View!, visibility: Int)`
`Unit`	`onWindowFocusChanged(hasWindowFocus: Boolean)`
`Unit`	`onWindowSystemUiVisibilityChanged(visible: Int)` This function is deprecated.
`Unit`	`onWindowVisibilityChanged(visibility: Int)`
`Boolean`	`overScrollBy( deltaX: Int, deltaY: Int, scrollX: Int, scrollY: Int, scrollRangeX: Int, scrollRangeY: Int, maxOverScrollX: Int, maxOverScrollY: Int, isTouchEvent: Boolean )`
`Boolean`	`performAccessibilityAction(action: Int, arguments: Bundle!)`
`Boolean`	`performClick()`
`Boolean`	`performContextClick(x: Float, y: Float)`
`Boolean`	`performHapticFeedback(feedbackConstant: Int)`
`Boolean`	`performLongClick()`
`ContentInfo!`	`performReceiveContent(payload: ContentInfo!)`
`Unit`	`playSoundEffect(soundConstant: Int)`
`Boolean`	`post(action: Runnable!)`
`Boolean`	`postDelayed(action: Runnable!, delayMillis: Long)`
`Unit`	`postInvalidate()`
`Unit`	`postInvalidateDelayed(delayMilliseconds: Long)`
`Unit`	`postInvalidateOnAnimation()`
`Unit`	`postOnAnimation(action: Runnable!)`
`Unit`	`postOnAnimationDelayed(action: Runnable!, delayMillis: Long)`
`Unit`	`refreshDrawableState()`
`Unit`	`releasePointerCapture()`
`Boolean`	`removeCallbacks(action: Runnable!)`
`Unit`	`removeOnAttachStateChangeListener( listener: View.OnAttachStateChangeListener! )`
`Unit`	`removeOnLayoutChangeListener(listener: View.OnLayoutChangeListener!)`
`Unit`	`removeOnUnhandledKeyEventListener( listener: View.OnUnhandledKeyEventListener! )`
`Unit`	`requestApplyInsets()`
`Unit`	`requestFitSystemWindows()` This function is deprecated.
`Boolean`	`requestFocusFromTouch()`
`Unit`	`requestPointerCapture()`
`Boolean`	`requestRectangleOnScreen(rectangle: Rect!)`
`Unit`	`requestUnbufferedDispatch(event: MotionEvent!)`
`T!`	`<T : View?> requireViewById(id: Int)`
`Unit`	`resetPivot()`
`java-static Int`	`resolveSize(size: Int, measureSpec: Int)`
`java-static Int`	`resolveSizeAndState(size: Int, measureSpec: Int, childMeasuredState: Int)`
`Unit`	`restoreHierarchyState(container: SparseArray<Parcelable!>!)`
`Unit`	`saveAttributeDataForStyleable( context: Context!, styleable: IntArray!, attrs: AttributeSet!, t: TypedArray!, defStyleAttr: Int, defStyleRes: Int )`
`Unit`	`saveHierarchyState(container: SparseArray<Parcelable!>!)`
`Unit`	`scheduleDrawable(who: Drawable!, what: Runnable!, when: Long)`
`Unit`	`sendAccessibilityEvent(eventType: Int)`
`Unit`	`setAccessibilityDataSensitive(accessibilityDataSensitive: Int)`
`Unit`	`setAccessibilityDelegate(delegate: View.AccessibilityDelegate!)`
`Unit`	`setAccessibilityHeading(isHeading: Boolean)`
`Unit`	`setAccessibilityLiveRegion(mode: Int)`
`Unit`	`setAccessibilityPaneTitle(accessibilityPaneTitle: CharSequence!)`
`Unit`	`setAccessibilityTraversalAfter(afterId: Int)`
`Unit`	`setAccessibilityTraversalBefore(beforeId: Int)`
`Unit`	`setActivated(activated: Boolean)`
`Unit`	`setAllowClickWhenDisabled(clickableWhenDisabled: Boolean)`
`Unit`	`setAllowedHandwritingDelegatePackage(allowedPackageName: String!)`
`Unit`	`setAllowedHandwritingDelegatorPackage(allowedPackageName: String!)`
`Unit`	`setAlpha(alpha: Float)`
`Unit`	`setAnimation(animation: Animation!)`
`Unit`	`setAnimationMatrix(matrix: Matrix!)`
`Unit`	`setAutoHandwritingEnabled(enabled: Boolean)`
`Unit`	`setAutofillHints(autofillHints: Array<String!>!)`
`Unit`	`setAutofillId(id: AutofillId!)`
`Unit`	`setBackground(background: Drawable!)`
`Unit`	`setBackgroundColor(color: Int)`
`Unit`	`setBackgroundDrawable(background: Drawable!)` This function is deprecated.
`Unit`	`setBackgroundResource(resid: Int)`
`Unit`	`setBackgroundTintBlendMode(blendMode: BlendMode!)`
`Unit`	`setBackgroundTintList(tint: ColorStateList!)`
`Unit`	`setBackgroundTintMode(tintMode: PorterDuff.Mode!)`
`Unit`	`setBottom(bottom: Int)`
`Unit`	`setCameraDistance(distance: Float)`
`Unit`	`setClickable(clickable: Boolean)`
`Unit`	`setClipBounds(clipBounds: Rect!)`
`Unit`	`setClipToOutline(clipToOutline: Boolean)`
`Unit`	`setContentCaptureSession(contentCaptureSession: ContentCaptureSession!)`
`Unit`	`setContentDescription(contentDescription: CharSequence!)`
`Unit`	`setContextClickable(contextClickable: Boolean)`
`Unit`	`setDefaultFocusHighlightEnabled(defaultFocusHighlightEnabled: Boolean)`
`Unit`	`setDrawingCacheBackgroundColor(color: Int)` This function is deprecated.
`Unit`	`setDrawingCacheEnabled(enabled: Boolean)` This function is deprecated.
`Unit`	`setDrawingCacheQuality(quality: Int)` This function is deprecated.
`Unit`	`setDuplicateParentStateEnabled(enabled: Boolean)`
`Unit`	`setElevation(elevation: Float)`
`Unit`	`setEnabled(enabled: Boolean)`
`Unit`	`setFadingEdgeLength(length: Int)`
`Unit`	`setFilterTouchesWhenObscured(enabled: Boolean)`
`Unit`	`setFitsSystemWindows(fitSystemWindows: Boolean)`
`Unit`	`setFocusable(focusable: Boolean)`
`Unit`	`setFocusableInTouchMode(focusableInTouchMode: Boolean)`
`Unit`	`setFocusedByDefault(isFocusedByDefault: Boolean)`
`Unit`	`setForceDarkAllowed(allow: Boolean)`
`Unit`	`setForeground(foreground: Drawable!)`
`Unit`	`setForegroundGravity(gravity: Int)`
`Unit`	`setForegroundTintBlendMode(blendMode: BlendMode!)`
`Unit`	`setForegroundTintList(tint: ColorStateList!)`
`Unit`	`setForegroundTintMode(tintMode: PorterDuff.Mode!)`
`Unit`	`setHandwritingBoundsOffsets( offsetLeft: Float, offsetTop: Float, offsetRight: Float, offsetBottom: Float )`
`Unit`	`setHandwritingDelegatorCallback(callback: Runnable!)`
`Unit`	`setHapticFeedbackEnabled(hapticFeedbackEnabled: Boolean)`
`Unit`	`setHasTransientState(hasTransientState: Boolean)`
`Unit`	`setHorizontalFadingEdgeEnabled(horizontalFadingEdgeEnabled: Boolean)`
`Unit`	`setHorizontalScrollBarEnabled(horizontalScrollBarEnabled: Boolean)`
`Unit`	`setHorizontalScrollbarThumbDrawable(drawable: Drawable!)`
`Unit`	`setHorizontalScrollbarTrackDrawable(drawable: Drawable!)`
`Unit`	`setHovered(hovered: Boolean)`
`Unit`	`setId(id: Int)`
`Unit`	`setImportantForAccessibility(mode: Int)`
`Unit`	`setImportantForAutofill(mode: Int)`
`Unit`	`setImportantForContentCapture(mode: Int)`
`Unit`	`setIsCredential(isCredential: Boolean)`
`Unit`	`setIsHandwritingDelegate(isHandwritingDelegate: Boolean)`
`Unit`	`setKeepScreenOn(keepScreenOn: Boolean)`
`Unit`	`setKeyboardNavigationCluster(isCluster: Boolean)`
`Unit`	`setLabelFor(id: Int)`
`Unit`	`setLayerPaint(paint: Paint!)`
`Unit`	`setLayerType(layerType: Int, paint: Paint!)`
`Unit`	`setLayoutDirection(layoutDirection: Int)`
`Unit`	`setLayoutParams(params: ViewGroup.LayoutParams!)`
`Unit`	`setLeft(left: Int)`
`Unit`	`setLeftTopRightBottom(left: Int, top: Int, right: Int, bottom: Int)`
`Unit`	`setLongClickable(longClickable: Boolean)`
`Unit`	`setMeasuredDimension(measuredWidth: Int, measuredHeight: Int)`
`Unit`	`setMinimumHeight(minHeight: Int)`
`Unit`	`setMinimumWidth(minWidth: Int)`
`Unit`	`setNextClusterForwardId(nextClusterForwardId: Int)`
`Unit`	`setNextFocusDownId(nextFocusDownId: Int)`
`Unit`	`setNextFocusForwardId(nextFocusForwardId: Int)`
`Unit`	`setNextFocusLeftId(nextFocusLeftId: Int)`
`Unit`	`setNextFocusRightId(nextFocusRightId: Int)`
`Unit`	`setNextFocusUpId(nextFocusUpId: Int)`
`Unit`	`setOnApplyWindowInsetsListener( listener: View.OnApplyWindowInsetsListener! )`
`Unit`	`setOnCapturedPointerListener(l: View.OnCapturedPointerListener!)`
`Unit`	`setOnClickListener(l: View.OnClickListener!)`
`Unit`	`setOnContextClickListener(l: View.OnContextClickListener!)`
`Unit`	`setOnCreateContextMenuListener(l: View.OnCreateContextMenuListener!)`
`Unit`	`setOnDragListener(l: View.OnDragListener!)`
`Unit`	`setOnFocusChangeListener(l: View.OnFocusChangeListener!)`
`Unit`	`setOnGenericMotionListener(l: View.OnGenericMotionListener!)`
`Unit`	`setOnHoverListener(l: View.OnHoverListener!)`
`Unit`	`setOnKeyListener(l: View.OnKeyListener!)`
`Unit`	`setOnLongClickListener(l: View.OnLongClickListener!)`
`Unit`	`setOnReceiveContentListener( mimeTypes: Array<String!>!, listener: OnReceiveContentListener! )`
`Unit`	`setOnScrollChangeListener(l: View.OnScrollChangeListener!)`
`Unit`	`setOnSystemUiVisibilityChangeListener( l: View.OnSystemUiVisibilityChangeListener! )` This function is deprecated.
`Unit`	`setOnTouchListener(l: View.OnTouchListener!)`
`Unit`	`setOutlineAmbientShadowColor(color: Int)`
`Unit`	`setOutlineProvider(provider: ViewOutlineProvider!)`
`Unit`	`setOutlineSpotShadowColor(color: Int)`
`Unit`	`setOverScrollMode(overScrollMode: Int)`
`Unit`	`setPadding(left: Int, top: Int, right: Int, bottom: Int)`
`Unit`	`setPaddingRelative(start: Int, top: Int, end: Int, bottom: Int)`
`Unit`	`setPivotX(pivotX: Float)`
`Unit`	`setPivotY(pivotY: Float)`
`Unit`	`setPointerIcon(pointerIcon: PointerIcon!)`
`Unit`	`setPreferKeepClear(preferKeepClear: Boolean)`
`Unit`	`setPreferKeepClearRects(rects: (Mutable)List<Rect!>!)`
`Unit`	`setPressed(pressed: Boolean)`
`Unit`	`setRenderEffect(renderEffect: RenderEffect!)`
`Unit`	`setRevealOnFocusHint(revealOnFocus: Boolean)`
`Unit`	`setRight(right: Int)`
`Unit`	`setRotation(rotation: Float)`
`Unit`	`setRotationX(rotationX: Float)`
`Unit`	`setRotationY(rotationY: Float)`
`Unit`	`setSaveEnabled(enabled: Boolean)`
`Unit`	`setSaveFromParentEnabled(enabled: Boolean)`
`Unit`	`setScaleX(scaleX: Float)`
`Unit`	`setScaleY(scaleY: Float)`
`Unit`	`setScreenReaderFocusable(screenReaderFocusable: Boolean)`
`Unit`	`setScrollBarDefaultDelayBeforeFade( scrollBarDefaultDelayBeforeFade: Int )`
`Unit`	`setScrollBarFadeDuration(scrollBarFadeDuration: Int)`
`Unit`	`setScrollBarSize(scrollBarSize: Int)`
`Unit`	`setScrollBarStyle(style: Int)`
`Unit`	`setScrollCaptureCallback(callback: ScrollCaptureCallback!)`
`Unit`	`setScrollCaptureHint(hint: Int)`
`Unit`	`setScrollContainer(isScrollContainer: Boolean)`
`Unit`	`setScrollIndicators(indicators: Int)`
`Unit`	`setScrollX(value: Int)`
`Unit`	`setScrollY(value: Int)`
`Unit`	`setScrollbarFadingEnabled(fadeScrollbars: Boolean)`
`Unit`	`setSelected(selected: Boolean)`
`Unit`	`setSoundEffectsEnabled(soundEffectsEnabled: Boolean)`
`Unit`	`setStateDescription(stateDescription: CharSequence!)`
`Unit`	`setStateListAnimator(stateListAnimator: StateListAnimator!)`
`Unit`	`setSystemGestureExclusionRects(rects: (Mutable)List<Rect!>!)`
`Unit`	`setSystemUiVisibility(visibility: Int)` This function is deprecated.
`Unit`	`setTag(tag: Any!)`
`Unit`	`setTextAlignment(textAlignment: Int)`
`Unit`	`setTextDirection(textDirection: Int)`
`Unit`	`setTooltipText(tooltipText: CharSequence!)`
`Unit`	`setTop(top: Int)`
`Unit`	`setTouchDelegate(delegate: TouchDelegate!)`
`Unit`	`setTransitionAlpha(alpha: Float)`
`Unit`	`setTransitionName(transitionName: String!)`
`Unit`	`setTransitionVisibility(visibility: Int)`
`Unit`	`setTranslationX(translationX: Float)`
`Unit`	`setTranslationY(translationY: Float)`
`Unit`	`setTranslationZ(translationZ: Float)`
`Unit`	`setVerticalFadingEdgeEnabled(verticalFadingEdgeEnabled: Boolean)`
`Unit`	`setVerticalScrollBarEnabled(verticalScrollBarEnabled: Boolean)`
`Unit`	`setVerticalScrollbarPosition(position: Int)`
`Unit`	`setVerticalScrollbarThumbDrawable(drawable: Drawable!)`
`Unit`	`setVerticalScrollbarTrackDrawable(drawable: Drawable!)`
`Unit`	`setViewTranslationCallback(callback: ViewTranslationCallback!)`
`Unit`	`setVisibility(visibility: Int)`
`Unit`	`setWillNotCacheDrawing(willNotCacheDrawing: Boolean)` This function is deprecated.
`Unit`	`setWillNotDraw(willNotDraw: Boolean)`
`Unit`	`setX(x: Float)`
`Unit`	`setY(y: Float)`
`Unit`	`setZ(z: Float)`
`Boolean`	`showContextMenu()`
`ActionMode!`	`startActionMode(callback: ActionMode.Callback!)`
`Unit`	`startAnimation(animation: Animation!)`
`Boolean`	`startDrag( data: ClipData!, shadowBuilder: View.DragShadowBuilder!, myLocalState: Any!, flags: Int )` This function is deprecated.
`Boolean`	`startDragAndDrop( data: ClipData!, shadowBuilder: View.DragShadowBuilder!, myLocalState: Any!, flags: Int )`
`String!`	`toString()`
`Unit`	`transformMatrixToGlobal(matrix: Matrix!)`
`Unit`	`transformMatrixToLocal(matrix: Matrix!)`
`Unit`	`unscheduleDrawable(who: Drawable!, what: Runnable!)`
`Unit`	`updateDragShadow(shadowBuilder: View.DragShadowBuilder!)`
`Boolean`	`verifyDrawable(who: Drawable!)`
`Boolean`	`willNotCacheDrawing()` This function is deprecated.
`Boolean`	`willNotDraw()`

From android.view.ViewGroup

`Unit`	`addChildrenForAccessibility(outChildren: ArrayList<View!>!)`
`Unit`	`addExtraDataToAccessibilityNodeInfo( info: AccessibilityNodeInfo!, extraDataKey: String!, arguments: Bundle! )`
`Unit`	`addKeyboardNavigationClusters( views: (Mutable)Collection<View!>!, direction: Int )`
`Boolean`	`addStatesFromChildren()`
`Unit`	`addTouchables(views: ArrayList<View!>!)`
`Unit`	`addView(child: View!)`
`Boolean`	`addViewInLayout(child: View!, index: Int, params: ViewGroup.LayoutParams!)`
`Unit`	`attachLayoutAnimationParameters( child: View!, params: ViewGroup.LayoutParams!, index: Int, count: Int )`
`Unit`	`attachViewToParent(child: View!, index: Int, params: ViewGroup.LayoutParams!)`
`Unit`	`bringChildToFront(child: View!)`
`Boolean`	`canAnimate()`
`Unit`	`childDrawableStateChanged(child: View!)`
`Unit`	`childHasTransientStateChanged( child: View!, childHasTransientState: Boolean )`
`Unit`	`cleanupLayoutState(child: View!)`
`Unit`	`clearChildFocus(child: View!)`
`Unit`	`clearDisappearingChildren()`
`Unit`	`clearFocus()`
`Unit`	`debug(depth: Int)`
`Unit`	`detachAllViewsFromParent()`
`Unit`	`detachViewFromParent(child: View!)`
`Unit`	`detachViewsFromParent(start: Int, count: Int)`
`WindowInsets!`	`dispatchApplyWindowInsets(insets: WindowInsets!)`
`Boolean`	`dispatchCapturedPointerEvent(event: MotionEvent!)`
`Unit`	`dispatchConfigurationChanged(newConfig: Configuration!)`
`Unit`	`dispatchCreateViewTranslationRequest( viewIds: (Mutable)Map<AutofillId!, LongArray!>!, supportedFormats: IntArray!, capability: TranslationCapability!, requests: (Mutable)List<ViewTranslationRequest!>! )`
`Unit`	`dispatchDisplayHint(hint: Int)`
`Boolean`	`dispatchDragEvent(event: DragEvent!)`
`Unit`	`dispatchDraw(canvas: Canvas!)`
`Unit`	`dispatchDrawableHotspotChanged(x: Float, y: Float)`
`Unit`	`dispatchFinishTemporaryDetach()`
`Unit`	`dispatchFreezeSelfOnly(container: SparseArray<Parcelable!>!)`
`Boolean`	`dispatchGenericFocusedEvent(event: MotionEvent!)`
`Boolean`	`dispatchGenericPointerEvent(event: MotionEvent!)`
`Boolean`	`dispatchHoverEvent(event: MotionEvent!)`
`Boolean`	`dispatchKeyEventPreIme(event: KeyEvent!)`
`Boolean`	`dispatchKeyShortcutEvent(event: KeyEvent!)`
`Unit`	`dispatchPointerCaptureChanged(hasCapture: Boolean)`
`Unit`	`dispatchProvideAutofillStructure(structure: ViewStructure!, flags: Int)`
`Unit`	`dispatchProvideStructure(structure: ViewStructure!)`
`Unit`	`dispatchScrollCaptureSearch( localVisibleRect: Rect!, windowOffset: Point!, targets: Consumer<ScrollCaptureTarget!>! )`
`Unit`	`dispatchSetActivated(activated: Boolean)`
`Unit`	`dispatchSetPressed(pressed: Boolean)`
`Unit`	`dispatchSetSelected(selected: Boolean)`
`Unit`	`dispatchStartTemporaryDetach()`
`Unit`	`dispatchSystemUiVisibilityChanged(visible: Int)` This function is deprecated.
`Unit`	`dispatchThawSelfOnly(container: SparseArray<Parcelable!>!)`
`Boolean`	`dispatchTouchEvent(ev: MotionEvent!)`
`Boolean`	`dispatchTrackballEvent(event: MotionEvent!)`
`Boolean`	`dispatchUnhandledMove(focused: View!, direction: Int)`
`Unit`	`dispatchVisibilityChanged(changedView: View!, visibility: Int)`
`Unit`	`dispatchWindowFocusChanged(hasFocus: Boolean)`
`Unit`	`dispatchWindowInsetsAnimationEnd(animation: WindowInsetsAnimation!)`
`Unit`	`dispatchWindowInsetsAnimationPrepare(animation: WindowInsetsAnimation!)`
`WindowInsets!`	`dispatchWindowInsetsAnimationProgress( insets: WindowInsets!, runningAnimations: (Mutable)List<WindowInsetsAnimation!>! )`
`WindowInsetsAnimation.Bounds!`	`dispatchWindowInsetsAnimationStart( animation: WindowInsetsAnimation!, bounds: WindowInsetsAnimation.Bounds! )`
`Unit`	`dispatchWindowSystemUiVisiblityChanged(visible: Int)` This function is deprecated.
`Unit`	`dispatchWindowVisibilityChanged(visibility: Int)`
`Unit`	`drawableStateChanged()`
`Unit`	`endViewTransition(view: View!)`
`View!`	`findFocus()`
`OnBackInvokedDispatcher!`	`findOnBackInvokedDispatcherForChild(child: View!, requester: View!)`
`Unit`	`findViewsWithText( outViews: ArrayList<View!>!, text: CharSequence!, flags: Int )`
`Unit`	`focusableViewAvailable(v: View!)`
`Boolean`	`gatherTransparentRegion(region: Region!)`
`View!`	`getChildAt(index: Int)`
`Int`	`getChildCount()`
`java-static Int`	`getChildMeasureSpec(spec: Int, padding: Int, childDimension: Int)`
`Boolean`	`getChildStaticTransformation(child: View!, t: Transformation!)`
`Boolean`	`getChildVisibleRect(child: View!, r: Rect!, offset: Point!)`
`Boolean`	`getClipChildren()`
`Int`	`getDescendantFocusability()`
`View!`	`getFocusedChild()`
`LayoutAnimationController!`	`getLayoutAnimation()`
`Animation.AnimationListener!`	`getLayoutAnimationListener()`
`Int`	`getLayoutMode()`
`LayoutTransition!`	`getLayoutTransition()`
`Int`	`getNestedScrollAxes()`
`ViewGroupOverlay!`	`getOverlay()`
`Int`	`getPersistentDrawingCache()` This function is deprecated.
`Boolean`	`getTouchscreenBlocksFocus()`
`Boolean`	`hasFocus()`
`Boolean`	`hasTransientState()`
`Int`	`indexOfChild(child: View!)`
`Unit`	`invalidateChild(child: View!, dirty: Rect!)` This function is deprecated.
`ViewParent!`	`invalidateChildInParent(location: IntArray!, dirty: Rect!)` This function is deprecated.
`Boolean`	`isAlwaysDrawnWithCacheEnabled()` This function is deprecated.
`Boolean`	`isAnimationCacheEnabled()` This function is deprecated.
`Boolean`	`isChildrenDrawingOrderEnabled()`
`Boolean`	`isChildrenDrawnWithCacheEnabled()` This function is deprecated.
`Boolean`	`isMotionEventSplittingEnabled()`
`Boolean`	`isTransitionGroup()`
`Unit`	`jumpDrawablesToCurrentState()`
`Unit`	`layout(l: Int, t: Int, r: Int, b: Int)`
`Unit`	`measureChild( child: View!, parentWidthMeasureSpec: Int, parentHeightMeasureSpec: Int )`
`Unit`	`measureChildWithMargins( child: View!, parentWidthMeasureSpec: Int, widthUsed: Int, parentHeightMeasureSpec: Int, heightUsed: Int )`
`Unit`	`measureChildren(widthMeasureSpec: Int, heightMeasureSpec: Int)`
`Unit`	`notifySubtreeAccessibilityStateChanged( child: View!, source: View!, changeType: Int )`
`Unit`	`offsetDescendantRectToMyCoords(descendant: View!, rect: Rect!)`
`Unit`	`offsetRectIntoDescendantCoords(descendant: View!, rect: Rect!)`
`IntArray<Int>!`	`onCreateDrawableState(extraSpace: Int)`
`Unit`	`onDescendantInvalidated(child: View!, target: View!)`
`Boolean`	`onInterceptHoverEvent(event: MotionEvent!)`
`Boolean`	`onNestedFling( target: View!, velocityX: Float, velocityY: Float, consumed: Boolean )`
`Boolean`	`onNestedPreFling(target: View!, velocityX: Float, velocityY: Float)`
`Boolean`	`onNestedPrePerformAccessibilityAction( target: View!, action: Int, args: Bundle! )`
`Unit`	`onNestedPreScroll(target: View!, dx: Int, dy: Int, consumed: IntArray!)`
`Unit`	`onNestedScroll( target: View!, dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int, dyUnconsumed: Int )`
`Unit`	`onNestedScrollAccepted(child: View!, target: View!, axes: Int)`
`Boolean`	`onRequestSendAccessibilityEvent(child: View!, event: AccessibilityEvent!)`
`PointerIcon!`	`onResolvePointerIcon(event: MotionEvent!, pointerIndex: Int)`
`Boolean`	`onStartNestedScroll(child: View!, target: View!, nestedScrollAxes: Int)`
`Unit`	`onStopNestedScroll(child: View!)`
`Unit`	`onViewAdded(child: View!)`
`Unit`	`onViewRemoved(child: View!)`
`Unit`	`recomputeViewAttributes(child: View!)`
`Unit`	`removeAllViews()`
`Unit`	`removeAllViewsInLayout()`
`Unit`	`removeView(view: View!)`
`Unit`	`removeViewAt(index: Int)`
`Unit`	`removeViewInLayout(view: View!)`
`Unit`	`removeViews(start: Int, count: Int)`
`Unit`	`removeViewsInLayout(start: Int, count: Int)`
`Boolean`	`requestFocus(direction: Int, previouslyFocusedRect: Rect!)`
`Boolean`	`requestSendAccessibilityEvent(child: View!, event: AccessibilityEvent!)`
`Unit`	`requestTransparentRegion(child: View!)`
`Boolean`	`restoreDefaultFocus()`
`Unit`	`scheduleLayoutAnimation()`
`Unit`	`setAddStatesFromChildren(addsStates: Boolean)`
`Unit`	`setAlwaysDrawnWithCacheEnabled(always: Boolean)` This function is deprecated.
`Unit`	`setAnimationCacheEnabled(enabled: Boolean)` This function is deprecated.
`Unit`	`setChildrenDrawingCacheEnabled(enabled: Boolean)` This function is deprecated.
`Unit`	`setChildrenDrawingOrderEnabled(enabled: Boolean)`
`Unit`	`setChildrenDrawnWithCacheEnabled(enabled: Boolean)` This function is deprecated.
`Unit`	`setClipChildren(clipChildren: Boolean)`
`Unit`	`setDescendantFocusability(focusability: Int)`
`Unit`	`setLayoutAnimation(controller: LayoutAnimationController!)`
`Unit`	`setLayoutAnimationListener( animationListener: Animation.AnimationListener! )`
`Unit`	`setLayoutMode(layoutMode: Int)`
`Unit`	`setMotionEventSplittingEnabled(split: Boolean)`
`Unit`	`setOnHierarchyChangeListener( listener: ViewGroup.OnHierarchyChangeListener! )`
`Unit`	`setPersistentDrawingCache(drawingCacheToKeep: Int)` This function is deprecated.
`Unit`	`setStaticTransformationsEnabled(enabled: Boolean)`
`Unit`	`setTouchscreenBlocksFocus(touchscreenBlocksFocus: Boolean)`
`Unit`	`setTransitionGroup(isTransitionGroup: Boolean)`
`Unit`	`setWindowInsetsAnimationCallback( callback: WindowInsetsAnimation.Callback! )`
`Boolean`	`shouldDelayChildPressedState()`
`Boolean`	`showContextMenuForChild(originalView: View!)`
`ActionMode!`	`startActionModeForChild( originalView: View!, callback: ActionMode.Callback! )`
`Unit`	`startLayoutAnimation()`
`Unit`	`startViewTransition(view: View!)`
`Unit`	`updateViewLayout(view: View!, params: ViewGroup.LayoutParams!)`

Constants

HORIZONTAL

Added in 1.0.0

const val HORIZONTAL = 0: Int

INVALID_TYPE

Added in 1.0.0

const val INVALID_TYPE = -1: Int

NO_ID

Added in 1.0.0

const val NO_ID = -1: Long

NO_POSITION

Added in 1.0.0

const val NO_POSITION = -1: Int

SCROLL_STATE_DRAGGING

Added in 1.0.0

const val SCROLL_STATE_DRAGGING = 1: Int

The RecyclerView is currently being dragged by outside input such as user touch input.

See also
`getScrollState`

SCROLL_STATE_IDLE

Added in 1.0.0

const val SCROLL_STATE_IDLE = 0: Int

The RecyclerView is not currently scrolling.

See also
`getScrollState`

SCROLL_STATE_SETTLING

Added in 1.0.0

const val SCROLL_STATE_SETTLING = 2: Int

The RecyclerView is currently animating to a final position while not under outside control.

See also
`getScrollState`

TOUCH_SLOP_DEFAULT

Added in 1.0.0

const val TOUCH_SLOP_DEFAULT = 0: Int

Constant for use with setScrollingTouchSlop. Indicates that the RecyclerView should use the standard touch slop for smooth, continuous scrolling.

TOUCH_SLOP_PAGING

Added in 1.0.0

const val TOUCH_SLOP_PAGING = 1: Int

Constant for use with setScrollingTouchSlop. Indicates that the RecyclerView should use the standard touch slop for scrolling widgets that snap to a page or other coarse-grained barrier.

UNDEFINED_DURATION

Added in 1.1.0

const val UNDEFINED_DURATION = -2147483648: Int

Constant that represents that a duration has not been defined.

VERTICAL

Added in 1.0.0

const val VERTICAL = 1: Int

Public constructors

RecyclerView

Added in 1.0.0

RecyclerView(context: Context)

RecyclerView

Added in 1.0.0

RecyclerView(context: Context, attrs: AttributeSet?)

RecyclerView

Added in 1.0.0

RecyclerView(context: Context, attrs: AttributeSet?, defStyleAttr: Int)

Public functions

addFocusables

fun addFocusables(views: ArrayList<View!>!, direction: Int, focusableMode: Int): Unit

Added in 1.0.0

fun addItemDecoration(decor: RecyclerView.ItemDecoration): Unit

Add an ItemDecoration to this RecyclerView. Item decorations can affect both measurement and drawing of individual item views.

Item decorations are ordered. Decorations placed earlier in the list will be run/queried/drawn first for their effects on item views. Padding added to views will be nested; a padding added by an earlier decoration will mean further item decorations in the list will be asked to draw/pad within the previous decoration's given area.

Parameters
`decor: RecyclerView.ItemDecoration`	Decoration to add

Added in 1.0.0

fun addItemDecoration(decor: RecyclerView.ItemDecoration, index: Int): Unit

Add an ItemDecoration to this RecyclerView. Item decorations can affect both measurement and drawing of individual item views.

Parameters
`decor: RecyclerView.ItemDecoration`	Decoration to add
`index: Int`	Position in the decoration chain to insert this decoration at. If this value is negative the decoration will be added at the end.

Added in 1.0.0

fun addOnChildAttachStateChangeListener(
    listener: RecyclerView.OnChildAttachStateChangeListener
): Unit

This listener will be called when a LayoutManager or the RecyclerView decides that a child view is no longer needed. If an application associates expensive or heavyweight data with item views, this may be a good place to release or free those resources.

Parameters
`listener: RecyclerView.OnChildAttachStateChangeListener`	Listener to register

Added in 1.0.0

fun addOnItemTouchListener(listener: RecyclerView.OnItemTouchListener): Unit

Add an OnItemTouchListener to intercept touch events before they are dispatched to child views or this view's standard scrolling behavior.

Client code may use listeners to implement item manipulation behavior. Once a listener returns true from onInterceptTouchEvent its onTouchEvent method will be called for each incoming MotionEvent until the end of the gesture.

Parameters
`listener: RecyclerView.OnItemTouchListener`	Listener to add

See also
`RecyclerView.SimpleOnItemTouchListener`

Added in 1.0.0

fun addOnScrollListener(listener: RecyclerView.OnScrollListener): Unit

Add a listener that will be notified of any changes in scroll state or position.

Components that add a listener should take care to remove it when finished. Other components that take ownership of a view may call clearOnScrollListeners to remove all attached listeners.

Parameters
`listener: RecyclerView.OnScrollListener`	listener to set

Added in 1.2.0

fun addRecyclerListener(listener: RecyclerView.RecyclerListener): Unit

The listeners will be called when a LayoutManager or the RecyclerView decides that a child view is no longer needed. If an application associates data with the item views being recycled, this may be a good place to release or free those resources.

Parameters
`listener: RecyclerView.RecyclerListener`	Listener to register.

clearOnChildAttachStateChangeListeners

Added in 1.0.0

fun clearOnChildAttachStateChangeListeners(): Unit

Removes all listeners that were added via addOnChildAttachStateChangeListener.

clearOnScrollListeners

Added in 1.0.0

fun clearOnScrollListeners(): Unit

Remove all secondary listener that were notified of any changes in scroll state or position.

computeHorizontalScrollExtent

Added in 1.0.0

fun computeHorizontalScrollExtent(): Int

Compute the horizontal extent of the horizontal scrollbar's thumb within the horizontal range. This value is used to compute the length of the thumb within the scrollbar's track.

The range is expressed in arbitrary units that must be the same as the units used by computeHorizontalScrollRange and computeHorizontalScrollOffset.

Default implementation returns 0.

If you want to support scroll bars, override computeHorizontalScrollExtent in your LayoutManager.

Returns
`Int`	The horizontal extent of the scrollbar's thumb

See also
`computeHorizontalScrollExtent`

computeHorizontalScrollOffset

Added in 1.0.0

fun computeHorizontalScrollOffset(): Int

Compute the horizontal offset of the horizontal scrollbar's thumb within the horizontal range. This value is used to compute the position of the thumb within the scrollbar's track.

The range is expressed in arbitrary units that must be the same as the units used by computeHorizontalScrollRange and computeHorizontalScrollExtent.

Default implementation returns 0.

If you want to support scroll bars, override computeHorizontalScrollOffset in your LayoutManager.

Returns
`Int`	The horizontal offset of the scrollbar's thumb

See also
`computeHorizontalScrollOffset`	(RecyclerView.State)

computeHorizontalScrollRange

Added in 1.0.0

fun computeHorizontalScrollRange(): Int

Compute the horizontal range that the horizontal scrollbar represents.

The range is expressed in arbitrary units that must be the same as the units used by computeHorizontalScrollExtent and computeHorizontalScrollOffset.

Default implementation returns 0.

If you want to support scroll bars, override computeHorizontalScrollRange in your LayoutManager.

Returns
`Int`	The total horizontal range represented by the horizontal scrollbar

See also
`computeHorizontalScrollRange`

computeVerticalScrollExtent

Added in 1.0.0

fun computeVerticalScrollExtent(): Int

Compute the vertical extent of the vertical scrollbar's thumb within the vertical range. This value is used to compute the length of the thumb within the scrollbar's track.

The range is expressed in arbitrary units that must be the same as the units used by computeVerticalScrollRange and computeVerticalScrollOffset.

Default implementation returns 0.

If you want to support scroll bars, override computeVerticalScrollExtent in your LayoutManager.

Returns
`Int`	The vertical extent of the scrollbar's thumb

See also
`computeVerticalScrollExtent`

computeVerticalScrollOffset

Added in 1.0.0

fun computeVerticalScrollOffset(): Int

Compute the vertical offset of the vertical scrollbar's thumb within the vertical range. This value is used to compute the position of the thumb within the scrollbar's track.

The range is expressed in arbitrary units that must be the same as the units used by computeVerticalScrollRange and computeVerticalScrollExtent.

Default implementation returns 0.

If you want to support scroll bars, override computeVerticalScrollOffset in your LayoutManager.

Returns
`Int`	The vertical offset of the scrollbar's thumb

See also
`computeVerticalScrollOffset`	(RecyclerView.State)

computeVerticalScrollRange

Added in 1.0.0

fun computeVerticalScrollRange(): Int

Compute the vertical range that the vertical scrollbar represents.

The range is expressed in arbitrary units that must be the same as the units used by computeVerticalScrollExtent and computeVerticalScrollOffset.

Default implementation returns 0.

If you want to support scroll bars, override computeVerticalScrollRange in your LayoutManager.

Returns
`Int`	The total vertical range represented by the vertical scrollbar

See also
`computeVerticalScrollRange`

dispatchKeyEvent

fun dispatchKeyEvent(event: KeyEvent?): Boolean

dispatchNestedFling

fun dispatchNestedFling(velocityX: Float, velocityY: Float, consumed: Boolean): Boolean

dispatchNestedPreFling

fun dispatchNestedPreFling(velocityX: Float, velocityY: Float): Boolean

dispatchNestedPreScroll

fun dispatchNestedPreScroll(
    dx: Int,
    dy: Int,
    consumed: IntArray!,
    offsetInWindow: IntArray!
): Boolean

dispatchNestedPreScroll

Added in 1.0.0

fun dispatchNestedPreScroll(
    dx: Int,
    dy: Int,
    consumed: IntArray!,
    offsetInWindow: IntArray!,
    type: Int
): Boolean

Dispatch one step of a nested scroll in progress before this view consumes any portion of it.

Nested pre-scroll events are to nested scroll events what touch intercept is to touch. dispatchNestedPreScroll offers an opportunity for the parent view in a nested scrolling operation to consume some or all of the scroll operation before the child view consumes it.

Parameters
`dx: Int`	Horizontal scroll distance in pixels
`dy: Int`	Vertical scroll distance in pixels
`consumed: IntArray!`	Output. If not null, consumed[0] will contain the consumed component of dx and consumed[1] the consumed dy.
`offsetInWindow: IntArray!`	Optional. If not null, on return this will contain the offset in local view coordinates of this view from before this operation to after it completes. View implementations may use this to adjust expected input coordinate tracking.
`type: Int`	the type of input which cause this scroll event

Returns
`Boolean`	true if the parent consumed some or all of the scroll delta

See also
`dispatchNestedScroll`

dispatchNestedScroll

fun dispatchNestedScroll(
    dxConsumed: Int,
    dyConsumed: Int,
    dxUnconsumed: Int,
    dyUnconsumed: Int,
    offsetInWindow: IntArray!
): Boolean

dispatchNestedScroll

Added in 1.0.0

fun dispatchNestedScroll(
    dxConsumed: Int,
    dyConsumed: Int,
    dxUnconsumed: Int,
    dyUnconsumed: Int,
    offsetInWindow: IntArray!,
    type: Int
): Boolean

Dispatch one step of a nested scroll in progress.

Implementations of views that support nested scrolling should call this to report info about a scroll in progress to the current nested scrolling parent. If a nested scroll is not currently in progress or nested scrolling is not enabled for this view this method does nothing.

Compatible View implementations should also call dispatchNestedPreScroll before consuming a component of the scroll event themselves.

Parameters
`dxConsumed: Int`	Horizontal distance in pixels consumed by this view during this scroll step
`dyConsumed: Int`	Vertical distance in pixels consumed by this view during this scroll step
`dxUnconsumed: Int`	Horizontal scroll distance in pixels not consumed by this view
`dyUnconsumed: Int`	Horizontal scroll distance in pixels not consumed by this view
`offsetInWindow: IntArray!`	Optional. If not null, on return this will contain the offset in local view coordinates of this view from before this operation to after it completes. View implementations may use this to adjust expected input coordinate tracking.
`type: Int`	the type of input which cause this scroll event

Returns
`Boolean`	true if the event was dispatched, false if it could not be dispatched.

See also
`dispatchNestedPreScroll`

dispatchNestedScroll

Added in 1.1.0

fun dispatchNestedScroll(
    dxConsumed: Int,
    dyConsumed: Int,
    dxUnconsumed: Int,
    dyUnconsumed: Int,
    offsetInWindow: IntArray!,
    type: Int,
    consumed: IntArray
): Unit

Dispatch one step of a nested scroll in progress.

Compatible View implementations should also call dispatchNestedPreScroll before consuming a component of the scroll event themselves.

The original nested scrolling child (where the input events were received to start the scroll) must provide a non-null consumed parameter with values {0, 0}.

Parameters
`dxConsumed: Int`	Horizontal distance in pixels consumed by this view during this scroll step
`dyConsumed: Int`	Vertical distance in pixels consumed by this view during this scroll step
`dxUnconsumed: Int`	Horizontal scroll distance in pixels not consumed by this view
`dyUnconsumed: Int`	Horizontal scroll distance in pixels not consumed by this view
`offsetInWindow: IntArray!`	Optional. If not null, on return this will contain the offset in local view coordinates of this view from before this operation to after it completes. View implementations may use this to adjust expected input coordinate tracking.
`type: Int`	the type of input which cause this scroll event
`consumed: IntArray`	Output. Upon this method returning, will contain the original values plus any scroll distances consumed by all of this view's nested scrolling parents up the view hierarchy. Index 0 for the x dimension, and index 1 for the y dimension

See also
`onNestedScroll`

dispatchPopulateAccessibilityEvent

fun dispatchPopulateAccessibilityEvent(event: AccessibilityEvent!): Boolean

draw

fun draw(c: Canvas): Unit

drawChild

Added in 1.0.0

fun drawChild(canvas: Canvas, child: View!, drawingTime: Long): Boolean

findChildViewUnder

Added in 1.0.0

fun findChildViewUnder(x: Float, y: Float): View?

Find the topmost view under the given point.

Parameters
`x: Float`	Horizontal position in pixels to search
`y: Float`	Vertical position in pixels to search

Returns
`View?`	The child view under (x, y) or null if no matching child is found

findContainingItemView

Added in 1.0.0

fun findContainingItemView(view: View): View?

Traverses the ancestors of the given view and returns the item view that contains it and also a direct child of the RecyclerView. This returned view can be used to get the ViewHolder by calling getChildViewHolder.

Parameters
`view: View`	The view that is a descendant of the RecyclerView.

Returns
`View?`	The direct child of the RecyclerView which contains the given view or null if the provided view is not a descendant of this RecyclerView.

See also
`getChildViewHolder`
`findContainingViewHolder`

findContainingViewHolder

Added in 1.0.0

fun findContainingViewHolder(view: View): RecyclerView.ViewHolder?

Returns the ViewHolder that contains the given view.

Parameters
`view: View`	The view that is a descendant of the RecyclerView.

Returns
`RecyclerView.ViewHolder?`	The ViewHolder that contains the given view or null if the provided view is not a descendant of this RecyclerView.

findViewHolderForAdapterPosition

Added in 1.0.0

fun findViewHolderForAdapterPosition(position: Int): RecyclerView.ViewHolder?

Return the ViewHolder for the item in the given position of the data set. Unlike findViewHolderForLayoutPosition this method takes into account any pending adapter changes that may not be reflected to the layout yet. On the other hand, if notifyDataSetChanged has been called but the new layout has not been calculated yet, this method will return null since the new positions of views are unknown until the layout is calculated.

This method checks only the children of RecyclerView. If the item at the given position is not laid out, it will not create a new one.

When the ItemAnimator is running a change animation, there might be 2 ViewHolders representing the same Item. In this case, the updated ViewHolder will be returned.

Parameters
`position: Int`	The position of the item in the data set of the adapter

Returns
`RecyclerView.ViewHolder?`	The ViewHolder at `position` or null if there is no such item

findViewHolderForItemId

Added in 1.0.0

fun findViewHolderForItemId(id: Long): RecyclerView.ViewHolder!

Return the ViewHolder for the item with the given id. The RecyclerView must use an Adapter with stableIds to return a non-null value.

This method checks only the children of RecyclerView. If the item with the given id is not laid out, it will not create a new one. When the ItemAnimator is running a change animation, there might be 2 ViewHolders with the same id. In this case, the updated ViewHolder will be returned.

Parameters
`id: Long`	The id for the requested item

Returns
`RecyclerView.ViewHolder!`	The ViewHolder with the given `id` or null if there is no such item

findViewHolderForLayoutPosition

Added in 1.0.0

fun findViewHolderForLayoutPosition(position: Int): RecyclerView.ViewHolder?

Return the ViewHolder for the item in the given position of the data set as of the latest layout pass.

This method checks only the children of RecyclerView. If the item at the given position is not laid out, it will not create a new one.

Note that when Adapter contents change, ViewHolder positions are not updated until the next layout calculation. If there are pending adapter updates, the return value of this method may not match your adapter contents. You can use #getBindingAdapterPosition to get the current adapter position of a ViewHolder. If the Adapter that is assigned to the RecyclerView is an adapter that combines other adapters (e.g. ConcatAdapter), you can use the getBindingAdapter) to find the position relative to the Adapter that bound the ViewHolder.

When the ItemAnimator is running a change animation, there might be 2 ViewHolders with the same layout position representing the same Item. In this case, the updated ViewHolder will be returned.

Parameters
`position: Int`	The position of the item in the data set of the adapter

Returns
`RecyclerView.ViewHolder?`	The ViewHolder at `position` or null if there is no such item

findViewHolderForPosition

Added in 1.0.0

Deprecated in 1.0.0

fun findViewHolderForPosition(position: Int): RecyclerView.ViewHolder?

fling

Added in 1.0.0

fun fling(velocityX: Int, velocityY: Int): Boolean

Begin a standard fling with an initial velocity along each axis in pixels per second. If the velocity given is below the system-defined minimum this method will return false and no fling will occur.

Parameters
`velocityX: Int`	Initial horizontal velocity in pixels per second
`velocityY: Int`	Initial vertical velocity in pixels per second

Returns
`Boolean`	true if the fling was started, false if the velocity was too low to fling or LayoutManager does not support scrolling in the axis fling is issued.

See also
`canScrollVertically`
`canScrollHorizontally`

focusSearch

fun focusSearch(focused: View!, direction: Int): View!

Since RecyclerView is a collection ViewGroup that includes virtual children (items that are in the Adapter but not visible in the UI), it employs a more involved focus search strategy that differs from other ViewGroups.

It first does a focus search within the RecyclerView. If this search finds a View that is in the focus direction with respect to the currently focused View, RecyclerView returns that child as the next focus target. When it cannot find such child, it calls onFocusSearchFailed to layout more Views in the focus search direction. If LayoutManager adds a View that matches the focus search criteria, it will be returned as the focus search result. Otherwise, RecyclerView will call parent to handle the focus search like a regular ViewGroup.

When the direction is FOCUS_FORWARD or FOCUS_BACKWARD, a View that is not in the focus direction is still valid focus target which may not be the desired behavior if the Adapter has more children in the focus direction. To handle this case, RecyclerView converts the focus direction to an absolute direction and makes a preliminary focus search in that direction. If there are no Views to gain focus, it will call onFocusSearchFailed before running a focus search with the original (relative) direction. This allows RecyclerView to provide better candidates to the focus search while still allowing the view system to take focus from the RecyclerView and give it to a more suitable child if such child exists.

Parameters
`focused: View!`	The view that currently has focus
`direction: Int`	One of `FOCUS_UP`, `FOCUS_DOWN`, `FOCUS_LEFT`, `FOCUS_RIGHT`, `FOCUS_FORWARD`, `FOCUS_BACKWARD` or 0 for not applicable.

Returns
`View!`	A new View that can be the next focus after the focused View

generateLayoutParams

fun generateLayoutParams(attrs: AttributeSet!): ViewGroup.LayoutParams!

getAccessibilityClassName

fun getAccessibilityClassName(): CharSequence!

getAdapter

Added in 1.0.0

fun getAdapter(): RecyclerView.Adapter?

Retrieves the previously set adapter or null if no adapter is set.

Returns
`RecyclerView.Adapter?`	The previously set adapter

See also
`setAdapter`

getBaseline

fun getBaseline(): Int

Return the offset of the RecyclerView's text baseline from the its top boundary. If the LayoutManager of this RecyclerView does not support baseline alignment, this method returns -1.

Returns
`Int`	the offset of the baseline within the RecyclerView's bounds or -1 if baseline alignment is not supported

getChildAdapterPosition

Added in 1.0.0

fun getChildAdapterPosition(child: View): Int

Return the adapter position that the given child view corresponds to.

Parameters
`child: View`	Child View to query

Returns
`Int`	Adapter position corresponding to the given view or `NO_POSITION`

getChildItemId

Added in 1.0.0

fun getChildItemId(child: View): Long

Return the stable item id that the given child view corresponds to.

Parameters
`child: View`	Child View to query

Returns
`Long`	Item id corresponding to the given view or `NO_ID`

getChildLayoutPosition

Added in 1.0.0

fun getChildLayoutPosition(child: View): Int

Return the adapter position of the given child view as of the latest completed layout pass.

This position may not be equal to Item's adapter position if there are pending changes in the adapter which have not been reflected to the layout yet.

Parameters
`child: View`	Child View to query

Returns
`Int`	Adapter position of the given View as of last layout pass or `NO_POSITION` if the View is representing a removed item.

getChildPosition

Added in 1.0.0

Deprecated in 1.0.0

fun getChildPosition(child: View): Int

getChildViewHolder

Added in 1.0.0

fun getChildViewHolder(child: View): RecyclerView.ViewHolder!

Retrieve the ViewHolder for the given child view.

Parameters
`child: View`	Child of this RecyclerView to query for its ViewHolder

Returns
`RecyclerView.ViewHolder!`	The child view's ViewHolder

getClipToPadding

fun getClipToPadding(): Boolean

Returns whether this RecyclerView will clip its children to its padding, and resize (but not clip) any EdgeEffect to the padded region, if padding is present.

By default, children are clipped to the padding of their parent RecyclerView. This clipping behavior is only enabled if padding is non-zero.

name android:clipToPadding

Returns
`Boolean`	true if this RecyclerView clips children to its padding and resizes (but doesn't clip) any EdgeEffect to the padded region, false otherwise.

getCompatAccessibilityDelegate

Added in 1.0.0

fun getCompatAccessibilityDelegate(): RecyclerViewAccessibilityDelegate?

Returns the accessibility delegate compatibility implementation used by the RecyclerView.

Returns
`RecyclerViewAccessibilityDelegate?`	An instance of AccessibilityDelegateCompat used by RecyclerView

getDecoratedBoundsWithMargins

Added in 1.0.0

fun getDecoratedBoundsWithMargins(view: View, outBounds: Rect): Unit

Returns the bounds of the view including its decoration and margins.

Parameters
`view: View`	The view element to check
`outBounds: Rect`	A rect that will receive the bounds of the element including its decoration and margins.

getEdgeEffectFactory

Added in 1.0.0

fun getEdgeEffectFactory(): RecyclerView.EdgeEffectFactory

Retrieves the previously set EdgeEffectFactory or the default factory if nothing was set.

Returns
`RecyclerView.EdgeEffectFactory`	The previously set `EdgeEffectFactory`

See also
`setEdgeEffectFactory`

getItemAnimator

Added in 1.0.0

fun getItemAnimator(): RecyclerView.ItemAnimator?

Gets the current ItemAnimator for this RecyclerView. A null return value indicates that there is no animator and that item changes will happen without any animations. By default, RecyclerView instantiates and uses an instance of DefaultItemAnimator.

Returns
`RecyclerView.ItemAnimator?`	ItemAnimator The current ItemAnimator. If null, no animations will occur when changes occur to the items in this RecyclerView.

getItemDecorationAt

Added in 1.0.0

fun getItemDecorationAt(index: Int): RecyclerView.ItemDecoration

Returns an ItemDecoration previously added to this RecyclerView.

Parameters
`index: Int`	The index position of the desired ItemDecoration.

Returns
`RecyclerView.ItemDecoration`	the ItemDecoration at index position

Throws
`java.lang.IndexOutOfBoundsException`	on invalid index

getItemDecorationCount

Added in 1.0.0

fun getItemDecorationCount(): Int

Returns the number of ItemDecoration currently added to this RecyclerView.

Returns
`Int`	number of ItemDecorations currently added added to this RecyclerView.

getLayoutManager

Added in 1.0.0

fun getLayoutManager(): RecyclerView.LayoutManager?

Return the LayoutManager currently responsible for layout policy for this RecyclerView.

Returns
`RecyclerView.LayoutManager?`	The currently bound LayoutManager

getMaxFlingVelocity

Added in 1.0.0

fun getMaxFlingVelocity(): Int

Returns the maximum fling velocity used by this RecyclerView.

Returns
`Int`	The maximum fling velocity used by this RecyclerView.

getMinFlingVelocity

Added in 1.0.0

fun getMinFlingVelocity(): Int

Returns the minimum velocity to start a fling.

Returns
`Int`	The minimum velocity to start a fling

getOnFlingListener

Added in 1.0.0

fun getOnFlingListener(): RecyclerView.OnFlingListener?

Get the current OnFlingListener from this RecyclerView.

Returns
`RecyclerView.OnFlingListener?`	The `OnFlingListener` instance currently set (can be null).

getPreserveFocusAfterLayout

Added in 1.0.0

fun getPreserveFocusAfterLayout(): Boolean

Returns true if the RecyclerView should attempt to preserve currently focused Adapter Item's focus even if the View representing the Item is replaced during a layout calculation.

By default, this value is true.

Returns
`Boolean`	True if the RecyclerView will try to preserve focused Item after a layout if it loses focus.

See also
`setPreserveFocusAfterLayout`

getRecycledViewPool

Added in 1.0.0

fun getRecycledViewPool(): RecyclerView.RecycledViewPool

Retrieve this RecyclerView's RecycledViewPool. This method will never return null; if no pool is set for this view a new one will be created. See setRecycledViewPool for more information.

Returns
`RecyclerView.RecycledViewPool`	The pool used to store recycled item views for reuse.

See also
`setRecycledViewPool`

getScrollState

Added in 1.0.0

fun getScrollState(): Int

Return the current scrolling state of the RecyclerView.

Returns
`Int`	`SCROLL_STATE_IDLE`, `SCROLL_STATE_DRAGGING` or `SCROLL_STATE_SETTLING`

hasFixedSize

Added in 1.0.0

fun hasFixedSize(): Boolean

Returns
`Boolean`	true if the app has specified that changes in adapter content cannot change the size of the RecyclerView itself.

hasNestedScrollingParent

fun hasNestedScrollingParent(): Boolean

hasNestedScrollingParent

Added in 1.0.0

fun hasNestedScrollingParent(type: Int): Boolean

Returns true if this view has a nested scrolling parent for the given input type.

The presence of a nested scrolling parent indicates that this view has initiated a nested scroll and it was accepted by an ancestor view further up the view hierarchy.

Parameters
`type: Int`	the type of input which cause this scroll event

Returns
`Boolean`	whether this view has a nested scrolling parent

hasPendingAdapterUpdates

Added in 1.0.0

fun hasPendingAdapterUpdates(): Boolean

Returns whether there are pending adapter updates which are not yet applied to the layout.

If this method returns true, it means that what user is currently seeing may not reflect them adapter contents (depending on what has changed). You may use this information to defer or cancel some operations.

This method returns true if RecyclerView has not yet calculated the first layout after it is attached to the Window or the Adapter has been replaced.

Returns
`Boolean`	True if there are some adapter updates which are not yet reflected to layout or false if layout is up to date.

invalidateItemDecorations

Added in 1.0.0

fun invalidateItemDecorations(): Unit

Invalidates all ItemDecorations. If RecyclerView has item decorations, calling this method will trigger a requestLayout call.

isAnimating

Added in 1.0.0

fun isAnimating(): Boolean

Returns true if RecyclerView is currently running some animations.

If you want to be notified when animations are finished, use isRunning.

Returns
`Boolean`	True if there are some item animations currently running or waiting to be started.

isAttachedToWindow

fun isAttachedToWindow(): Boolean

Returns true if RecyclerView is attached to window.

isComputingLayout

Added in 1.0.0

fun isComputingLayout(): Boolean

Returns whether RecyclerView is currently computing a layout.

If this method returns true, it means that RecyclerView is in a lockdown state and any attempt to update adapter contents will result in an exception because adapter contents cannot be changed while RecyclerView is trying to compute the layout.

It is very unlikely that your code will be running during this state as it is called by the framework when a layout traversal happens or RecyclerView starts to scroll in response to system events (touch, accessibility etc).

This case may happen if you have some custom logic to change adapter contents in response to a View callback (e.g. focus change callback) which might be triggered during a layout calculation. In these cases, you should just postpone the change using a Handler or a similar mechanism.

Returns
`Boolean`	`true` if RecyclerView is currently computing a layout, `false` otherwise

isLayoutFrozen

Added in 1.0.0

Deprecated in 1.1.0

fun isLayoutFrozen(): Boolean

Returns
`Boolean`	true if layout and scroll are frozen

isLayoutSuppressed

Added in 1.1.0

fun isLayoutSuppressed(): Boolean

Returns whether layout and scroll calls on this container are currently being suppressed, due to an earlier call to suppressLayout.

Returns
`Boolean`	true if layout and scroll are currently suppressed, false otherwise.

isNestedScrollingEnabled

fun isNestedScrollingEnabled(): Boolean

nestedScrollBy

Added in 1.2.0

fun nestedScrollBy(x: Int, y: Int): Unit

Same as scrollBy, but also participates in nested scrolling.

Parameters
`x: Int`	The amount of horizontal scroll requested
`y: Int`	The amount of vertical scroll requested

See also
`NestedScrollingChild`

offsetChildrenHorizontal

Added in 1.0.0

fun offsetChildrenHorizontal(dx: @Px Int): Unit

Offset the bounds of all child views by dx pixels. Useful for implementing simple scrolling in LayoutManagers.

Parameters
`dx: @Px Int`	Horizontal pixel offset to apply to the bounds of all child views

offsetChildrenVertical

Added in 1.0.0

fun offsetChildrenVertical(dy: @Px Int): Unit

Offset the bounds of all child views by dy pixels. Useful for implementing simple scrolling in LayoutManagers.

Parameters
`dy: @Px Int`	Vertical pixel offset to apply to the bounds of all child views

onChildAttachedToWindow

Added in 1.0.0

fun onChildAttachedToWindow(child: View): Unit

Called when an item view is attached to this RecyclerView.

Subclasses of RecyclerView may want to perform extra bookkeeping or modifications of child views as they become attached. This will be called before a LayoutManager measures or lays out the view and is a good time to perform these changes.

Parameters
`child: View`	Child view that is now attached to this RecyclerView and its associated window

onChildDetachedFromWindow

Added in 1.0.0

fun onChildDetachedFromWindow(child: View): Unit

Called when an item view is detached from this RecyclerView.

Subclasses of RecyclerView may want to perform extra bookkeeping or modifications of child views as they become detached. This will be called as a LayoutManager fully detaches the child view from the parent and its window.

Parameters
`child: View`	Child view that is now detached from this RecyclerView and its associated window

onDraw

Added in 1.0.0

fun onDraw(c: Canvas): Unit

onGenericMotionEvent

fun onGenericMotionEvent(event: MotionEvent!): Boolean

onInterceptTouchEvent

fun onInterceptTouchEvent(e: MotionEvent!): Boolean

onScrollStateChanged

Added in 1.0.0

fun onScrollStateChanged(state: Int): Unit

Called when the scroll state of this RecyclerView changes. Subclasses should use this method to respond to state changes instead of an explicit listener.

This method will always be invoked before listeners, but after the LayoutManager responds to the scroll state change.

Parameters
`state: Int`	the new scroll state, one of `SCROLL_STATE_IDLE`, `SCROLL_STATE_DRAGGING` or `SCROLL_STATE_SETTLING`

onScrolled

Added in 1.0.0

fun onScrolled(dx: @Px Int, dy: @Px Int): Unit

Called when the scroll position of this RecyclerView changes. Subclasses should use this method to respond to scrolling within the adapter's data set instead of an explicit listener.

This method will always be invoked before listeners. If a subclass needs to perform any additional upkeep or bookkeeping after scrolling but before listeners run, this is a good place to do so.

This differs from onScrollChanged in that it receives the distance scrolled in either direction within the adapter's data set instead of absolute scroll coordinates. Since RecyclerView cannot compute the absolute scroll position from any arbitrary point in the data set, onScrollChanged will always receive the current getScrollX and getScrollY values which do not correspond to the data set scroll position. However, some subclasses may choose to use these fields as special offsets.

Parameters
`dx: @Px Int`	horizontal distance scrolled in pixels
`dy: @Px Int`	vertical distance scrolled in pixels

onTouchEvent

fun onTouchEvent(e: MotionEvent!): Boolean

Added in 1.0.0

fun removeItemDecoration(decor: RecyclerView.ItemDecoration): Unit

Remove an ItemDecoration from this RecyclerView.

The given decoration will no longer impact the measurement and drawing of item views.

Parameters
`decor: RecyclerView.ItemDecoration`	Decoration to remove

See also
`addItemDecoration`

removeItemDecorationAt

Added in 1.0.0

fun removeItemDecorationAt(index: Int): Unit

Removes the ItemDecoration associated with the supplied index position.

Parameters
`index: Int`	The index position of the ItemDecoration to be removed.

Added in 1.0.0

fun removeOnChildAttachStateChangeListener(
    listener: RecyclerView.OnChildAttachStateChangeListener
): Unit

Removes the provided listener from child attached state listeners list.

Parameters
`listener: RecyclerView.OnChildAttachStateChangeListener`	Listener to unregister

Added in 1.0.0

fun removeOnItemTouchListener(listener: RecyclerView.OnItemTouchListener): Unit

Remove an OnItemTouchListener. It will no longer be able to intercept touch events.

Parameters
`listener: RecyclerView.OnItemTouchListener`	Listener to remove

Added in 1.0.0

fun removeOnScrollListener(listener: RecyclerView.OnScrollListener): Unit

Remove a listener that was notified of any changes in scroll state or position.

Parameters
`listener: RecyclerView.OnScrollListener`	listener to set or null to clear

Added in 1.2.0

fun removeRecyclerListener(listener: RecyclerView.RecyclerListener): Unit

Removes the provided listener from RecyclerListener list.

Parameters
`listener: RecyclerView.RecyclerListener`	Listener to unregister.

requestChildFocus

fun requestChildFocus(child: View!, focused: View!): Unit

requestChildRectangleOnScreen

fun requestChildRectangleOnScreen(child: View!, rect: Rect!, immediate: Boolean): Boolean

requestDisallowInterceptTouchEvent

fun requestDisallowInterceptTouchEvent(disallowIntercept: Boolean): Unit

requestLayout

fun requestLayout(): Unit

scrollBy

fun scrollBy(x: Int, y: Int): Unit

scrollTo

fun scrollTo(x: Int, y: Int): Unit

scrollToPosition

Added in 1.0.0

fun scrollToPosition(position: Int): Unit

Convenience method to scroll to a certain position. RecyclerView does not implement scrolling logic, rather forwards the call to scrollToPosition

Parameters
`position: Int`	Scroll to this adapter position

See also
`scrollToPosition`

sendAccessibilityEventUnchecked

fun sendAccessibilityEventUnchecked(event: AccessibilityEvent!): Unit

Added in 1.0.0

fun setAccessibilityDelegateCompat(
    accessibilityDelegate: RecyclerViewAccessibilityDelegate?
): Unit

Sets the accessibility delegate compatibility implementation used by RecyclerView.

Parameters
`accessibilityDelegate: RecyclerViewAccessibilityDelegate?`	The accessibility delegate to be used by RecyclerView.

Added in 1.0.0

fun setAdapter(adapter: RecyclerView.Adapter?): Unit

Set a new adapter to provide child views on demand.

When adapter is changed, all existing views are recycled back to the pool. If the pool has only one adapter, it will be cleared.

Parameters
`adapter: RecyclerView.Adapter?`	The new adapter to set, or null to set no adapter.

See also
`swapAdapter`

Added in 1.0.0

fun setChildDrawingOrderCallback(
    childDrawingOrderCallback: RecyclerView.ChildDrawingOrderCallback?
): Unit

Sets the ChildDrawingOrderCallback to be used for drawing children.

See getChildDrawingOrder for details. Calling this method will always call setChildrenDrawingOrderEnabled. The parameter will be true if childDrawingOrderCallback is not null, false otherwise.

Note that child drawing order may be overridden by View's elevation.

Parameters
`childDrawingOrderCallback: RecyclerView.ChildDrawingOrderCallback?`	The ChildDrawingOrderCallback to be used by the drawing system.

setClipToPadding

fun setClipToPadding(clipToPadding: Boolean): Unit

setDebugAssertionsEnabled

Added in 1.4.0-rc01

java-static fun setDebugAssertionsEnabled(debugAssertionsEnabled: Boolean): Unit

Enable internal assertions about RecyclerView's state and throw exceptions if the assertions are violated.

This is primarily intended to diagnose problems with RecyclerView, and should not be enabled in production unless you have a specific reason to do so.

Enabling this may negatively affect performance and/or stability.

Parameters
`debugAssertionsEnabled: Boolean`	true to enable assertions; false to disable them

Added in 1.0.0

fun setEdgeEffectFactory(edgeEffectFactory: RecyclerView.EdgeEffectFactory): Unit

Set a EdgeEffectFactory for this RecyclerView.

When a new EdgeEffectFactory is set, any existing over-scroll effects are cleared and new effects are created as needed using createEdgeEffect

Parameters
`edgeEffectFactory: RecyclerView.EdgeEffectFactory`	The `EdgeEffectFactory` instance.

setHasFixedSize

Added in 1.0.0

fun setHasFixedSize(hasFixedSize: Boolean): Unit

RecyclerView can perform several optimizations if it can know in advance that RecyclerView's size is not affected by the adapter contents. RecyclerView can still change its size based on other factors (e.g. its parent's size) but this size calculation cannot depend on the size of its children or contents of its adapter (except the number of items in the adapter).

If your use of RecyclerView falls into this category, set this to true. It will allow RecyclerView to avoid invalidating the whole layout when its adapter contents change.

Parameters
`hasFixedSize: Boolean`	true if adapter changes cannot affect the size of the RecyclerView.

Added in 1.0.0

fun setItemAnimator(animator: RecyclerView.ItemAnimator?): Unit

Sets the ItemAnimator that will handle animations involving changes to the items in this RecyclerView. By default, RecyclerView instantiates and uses an instance of DefaultItemAnimator. Whether item animations are enabled for the RecyclerView depends on the ItemAnimator and whether the LayoutManager supports item animations.

Parameters
`animator: RecyclerView.ItemAnimator?`	The ItemAnimator being set. If null, no animations will occur when changes occur to the items in this RecyclerView.

setItemViewCacheSize

Added in 1.0.0

fun setItemViewCacheSize(size: Int): Unit

Set the number of offscreen views to retain before adding them to the potentially shared recycled view pool.

The offscreen view cache stays aware of changes in the attached adapter, allowing a LayoutManager to reuse those views unmodified without needing to return to the adapter to rebind them.

Parameters
`size: Int`	Number of views to cache offscreen before returning them to the general recycled view pool

setLayoutFrozen

Added in 1.0.0

Deprecated in 1.1.0

fun setLayoutFrozen(frozen: Boolean): Unit

Enable or disable layout and scroll. After setLayoutFrozen(true) is called, Layout requests will be postponed until setLayoutFrozen(false) is called; child views are not updated when RecyclerView is frozen, smoothScrollBy, scrollBy, scrollToPosition and smoothScrollToPosition are dropped; TouchEvents and GenericMotionEvents are dropped; onFocusSearchFailed will not be called.

setLayoutFrozen(true) does not prevent app from directly calling scrollToPosition, smoothScrollToPosition.

setAdapter and swapAdapter will automatically stop frozen.

Note: Running ItemAnimator is not stopped automatically, it's caller's responsibility to call ItemAnimator.end().

Parameters
`frozen: Boolean`	true to freeze layout and scroll, false to re-enable.

Added in 1.0.0

fun setLayoutManager(layout: RecyclerView.LayoutManager?): Unit

Set the LayoutManager that this RecyclerView will use.

In contrast to other adapter-backed views such as android.widget.ListView or android.widget.GridView, RecyclerView allows client code to provide custom layout arrangements for child views. These arrangements are controlled by the LayoutManager. A LayoutManager must be provided for RecyclerView to function.

Several default strategies are provided for common uses such as lists and grids.

Parameters
`layout: RecyclerView.LayoutManager?`	LayoutManager to use

setLayoutTransition

Added in 1.1.0

Deprecated in 1.1.0

fun setLayoutTransition(transition: LayoutTransition!): Unit

setNestedScrollingEnabled

fun setNestedScrollingEnabled(enabled: Boolean): Unit

Added in 1.0.0

fun setOnFlingListener(onFlingListener: RecyclerView.OnFlingListener?): Unit

Set a OnFlingListener for this RecyclerView.

If the OnFlingListener is set then it will receive calls to fling and will be able to intercept them.

Parameters
`onFlingListener: RecyclerView.OnFlingListener?`	The `OnFlingListener` instance.

Added in 1.0.0

Deprecated in 1.0.0

fun setOnScrollListener(listener: RecyclerView.OnScrollListener?): Unit

Set a listener that will be notified of any changes in scroll state or position.

Parameters
`listener: RecyclerView.OnScrollListener?`	Listener to set or null to clear

setPreserveFocusAfterLayout

Added in 1.0.0

fun setPreserveFocusAfterLayout(preserveFocusAfterLayout: Boolean): Unit

Set whether the RecyclerView should try to keep the same Item focused after a layout calculation or not.

Usually, LayoutManagers keep focused views visible before and after layout but sometimes, views may lose focus during a layout calculation as their state changes or they are replaced with another view due to type change or animation. In these cases, RecyclerView can request focus on the new view automatically.

Parameters
`preserveFocusAfterLayout: Boolean`	Whether RecyclerView should preserve focused Item during a layout calculations. Defaults to true.

See also
`getPreserveFocusAfterLayout`

Added in 1.0.0

fun setRecycledViewPool(pool: RecyclerView.RecycledViewPool?): Unit

Recycled view pools allow multiple RecyclerViews to share a common pool of scrap views. This can be useful if you have multiple RecyclerViews with adapters that use the same view types, for example if you have several data sets with the same kinds of item views displayed by a androidx.viewpager.widget.ViewPager.

Parameters
`pool: RecyclerView.RecycledViewPool?`	Pool to set. If this parameter is null a new pool will be created and used.

Added in 1.0.0

Deprecated in 1.2.0

fun setRecyclerListener(listener: RecyclerView.RecyclerListener?): Unit

Parameters
`listener: RecyclerView.RecyclerListener?`	Listener to register, or null to clear

setScrollingTouchSlop

Added in 1.0.0

fun setScrollingTouchSlop(slopConstant: Int): Unit

Configure the scrolling touch slop for a specific use case. Set up the RecyclerView's scrolling motion threshold based on common usages. Valid arguments are TOUCH_SLOP_DEFAULT and TOUCH_SLOP_PAGING.

Parameters
`slopConstant: Int`	One of the `TOUCH_SLOP_` constants representing the intended usage of this RecyclerView

setVerboseLoggingEnabled

Added in 1.4.0-rc01

java-static fun setVerboseLoggingEnabled(verboseLoggingEnabled: Boolean): Unit

Enable verbose logging within RecyclerView itself.

Enabling this may negatively affect performance and reduce the utility of logcat due to high-volume logging. This generally should not be enabled in production unless you have a specific reason for doing so.

Parameters
`verboseLoggingEnabled: Boolean`	true to enable logging; false to disable it

Added in 1.0.0

fun setViewCacheExtension(extension: RecyclerView.ViewCacheExtension?): Unit

Sets a new ViewCacheExtension to be used by the Recycler.

Parameters
`extension: RecyclerView.ViewCacheExtension?`	ViewCacheExtension to be used or null if you want to clear the existing one.

See also
`getViewForPositionAndType`

smoothScrollBy

Added in 1.0.0

fun smoothScrollBy(dx: @Px Int, dy: @Px Int): Unit

Animate a scroll by the given amount of pixels along either axis.

Parameters
`dx: @Px Int`	Pixels to scroll horizontally
`dy: @Px Int`	Pixels to scroll vertically

smoothScrollBy

Added in 1.0.0

fun smoothScrollBy(dx: @Px Int, dy: @Px Int, interpolator: Interpolator?): Unit

Animate a scroll by the given amount of pixels along either axis.

Parameters
`dx: @Px Int`	Pixels to scroll horizontally
`dy: @Px Int`	Pixels to scroll vertically
`interpolator: Interpolator?`	`Interpolator` to be used for scrolling. If it is `null`, RecyclerView will use an internal default interpolator.

smoothScrollBy

Added in 1.1.0

fun smoothScrollBy(
    dx: @Px Int,
    dy: @Px Int,
    interpolator: Interpolator?,
    duration: Int
): Unit

Smooth scrolls the RecyclerView by a given distance.

Parameters
`dx: @Px Int`	x distance in pixels.
`dy: @Px Int`	y distance in pixels.
`interpolator: Interpolator?`	`Interpolator` to be used for scrolling. If it is `null`, RecyclerView will use an internal default interpolator.
`duration: Int`	Duration of the animation in milliseconds. Set to `UNDEFINED_DURATION` to have the duration be automatically calculated based on an internally defined standard initial velocity. A duration less than 1 (that does not equal UNDEFINED_DURATION), will result in a call to `scrollBy`.

smoothScrollToPosition

Added in 1.0.0

fun smoothScrollToPosition(position: Int): Unit

Starts a smooth scroll to an adapter position.

To support smooth scrolling, you must override smoothScrollToPosition and create a SmoothScroller.

LayoutManager is responsible for creating the actual scroll action. If you want to provide a custom smooth scroll logic, override smoothScrollToPosition in your LayoutManager.

Parameters
`position: Int`	The adapter position to scroll to

See also
`smoothScrollToPosition`

startNestedScroll

fun startNestedScroll(axes: Int): Boolean

startNestedScroll

Added in 1.0.0

fun startNestedScroll(axes: Int, type: Int): Boolean

Begin a nestable scroll operation along the given axes, for the given input type.

A view starting a nested scroll promises to abide by the following contract:

The view will call startNestedScroll upon initiating a scroll operation. In the case of a touch scroll type this corresponds to the initial ACTION_DOWN. In the case of touch scrolling the nested scroll will be terminated automatically in the same manner as requestDisallowInterceptTouchEvent. In the event of programmatic scrolling the caller must explicitly call stopNestedScroll to indicate the end of the nested scroll.

If startNestedScroll returns true, a cooperative parent was found. If it returns false the caller may ignore the rest of this contract until the next scroll. Calling startNestedScroll while a nested scroll is already in progress will return true.

At each incremental step of the scroll the caller should invoke dispatchNestedPreScroll once it has calculated the requested scrolling delta. If it returns true the nested scrolling parent at least partially consumed the scroll and the caller should adjust the amount it scrolls by.

After applying the remainder of the scroll delta the caller should invoke dispatchNestedScroll, passing both the delta consumed and the delta unconsumed. A nested scrolling parent may treat these values differently. See onNestedScroll.

Parameters
`axes: Int`	Flags consisting of a combination of `SCROLL_AXIS_HORIZONTAL` and/or `SCROLL_AXIS_VERTICAL`.
`type: Int`	the type of input which cause this scroll event

Returns
`Boolean`	true if a cooperative parent was found and nested scrolling has been enabled for the current gesture.

See also
`stopNestedScroll`
`dispatchNestedPreScroll`
`dispatchNestedScroll`

stopNestedScroll

fun stopNestedScroll(): Unit

stopNestedScroll

Added in 1.0.0

fun stopNestedScroll(type: Int): Unit

Stop a nested scroll in progress for the given input type.

Calling this method when a nested scroll is not currently in progress is harmless.

Parameters
`type: Int`	the type of input which cause this scroll event

See also
`startNestedScroll`

stopScroll

Added in 1.0.0

fun stopScroll(): Unit

Stop any current scroll in progress, such as one started by smoothScrollBy, fling or a touch-initiated fling.

suppressLayout

Added in 1.1.0

fun suppressLayout(suppress: Boolean): Unit

Tells this RecyclerView to suppress all layout and scroll calls until layout suppression is disabled with a later call to suppressLayout(false). When layout suppression is disabled, a requestLayout() call is sent if requestLayout() was attempted while layout was being suppressed.

In addition to the layout suppression smoothScrollBy, scrollBy, scrollToPosition and smoothScrollToPosition are dropped; TouchEvents and GenericMotionEvents are dropped; onFocusSearchFailed will not be called.

suppressLayout(true) does not prevent app from directly calling scrollToPosition, smoothScrollToPosition.

setAdapter and swapAdapter will automatically stop suppressing.

Note: Running ItemAnimator is not stopped automatically, it's caller's responsibility to call ItemAnimator.end().

Parameters
`suppress: Boolean`	true to suppress layout and scroll, false to re-enable.

Added in 1.0.0

fun swapAdapter(
    adapter: RecyclerView.Adapter?,
    removeAndRecycleExistingViews: Boolean
): Unit

Swaps the current adapter with the provided one. It is similar to setAdapter but assumes existing adapter and the new adapter uses the same ViewHolder and does not clear the RecycledViewPool.

Note that it still calls onAdapterChanged callbacks.

Parameters
`adapter: RecyclerView.Adapter?`	The new adapter to set, or null to set no adapter.
`removeAndRecycleExistingViews: Boolean`	If set to true, RecyclerView will recycle all existing Views. If adapters have stable ids and/or you want to animate the disappearing views, you may prefer to set this to false.

See also
`setAdapter`

Protected functions

checkLayoutParams

protected fun checkLayoutParams(p: ViewGroup.LayoutParams!): Boolean

dispatchRestoreInstanceState

protected fun dispatchRestoreInstanceState(container: SparseArray<Parcelable!>!): Unit

Override to prevent thawing of any views created by the adapter.

dispatchSaveInstanceState

protected fun dispatchSaveInstanceState(container: SparseArray<Parcelable!>!): Unit

Override to prevent freezing of any views created by the adapter.

generateDefaultLayoutParams

protected fun generateDefaultLayoutParams(): ViewGroup.LayoutParams!

generateLayoutParams

protected fun generateLayoutParams(p: ViewGroup.LayoutParams!): ViewGroup.LayoutParams!

getChildDrawingOrder

protected fun getChildDrawingOrder(childCount: Int, i: Int): Int

onAttachedToWindow

protected fun onAttachedToWindow(): Unit

onDetachedFromWindow

protected fun onDetachedFromWindow(): Unit

onLayout

protected fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int): Unit

onMeasure

protected fun onMeasure(widthSpec: Int, heightSpec: Int): Unit

onRequestFocusInDescendants

protected fun onRequestFocusInDescendants(direction: Int, previouslyFocusedRect: Rect!): Boolean

onRestoreInstanceState

protected fun onRestoreInstanceState(state: Parcelable!): Unit

onSaveInstanceState

protected fun onSaveInstanceState(): Parcelable!

onSizeChanged

protected fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int): Unit

removeDetachedView

protected fun removeDetachedView(child: View!, animate: Boolean): Unit

RecyclerView

Glossary of terms:

Positions in RecyclerView:

Presenting Dynamic Data

Summary

Nested types

Constants

Public constructors

Public functions

Protected functions

Inherited Constants

Inherited functions

Constants

HORIZONTAL

INVALID_TYPE

NO_ID

NO_POSITION

SCROLL_STATE_DRAGGING

SCROLL_STATE_IDLE

SCROLL_STATE_SETTLING

TOUCH_SLOP_DEFAULT

TOUCH_SLOP_PAGING

UNDEFINED_DURATION

VERTICAL

Public constructors

RecyclerView

RecyclerView

RecyclerView

Public functions

addFocusables

addItemDecoration

addItemDecoration

addOnChildAttachStateChangeListener

addOnItemTouchListener

addOnScrollListener

addRecyclerListener

clearOnChildAttachStateChangeListeners

clearOnScrollListeners

computeHorizontalScrollExtent

computeHorizontalScrollOffset

computeHorizontalScrollRange

computeVerticalScrollExtent

computeVerticalScrollOffset

computeVerticalScrollRange

dispatchKeyEvent

dispatchNestedFling

dispatchNestedPreFling

dispatchNestedPreScroll

dispatchNestedPreScroll

dispatchNestedScroll

dispatchNestedScroll

dispatchNestedScroll

dispatchPopulateAccessibilityEvent

draw

drawChild

findChildViewUnder

findContainingItemView

findContainingViewHolder

findViewHolderForAdapterPosition

findViewHolderForItemId

findViewHolderForLayoutPosition

findViewHolderForPosition

fling

focusSearch

generateLayoutParams

getAccessibilityClassName

getAdapter

getBaseline

getChildAdapterPosition

getChildItemId

getChildLayoutPosition

getChildPosition

getChildViewHolder

getClipToPadding

getCompatAccessibilityDelegate

getDecoratedBoundsWithMargins

getEdgeEffectFactory

getItemAnimator

getItemDecorationAt

getItemDecorationCount