RecyclerView

Artifact: androidx.recyclerview:recyclerview

Added in 1.0.0

Kotlin |Java

public class RecyclerView extends ViewGroup implements ScrollingView, NestedScrollingChild2, NestedScrollingChild3

java.lang.Object
↳	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
`public abstract class RecyclerView.Adapter<VH extends RecyclerView.ViewHolder>` Base class for an Adapter
`public enum RecyclerView.Adapter.StateRestorationPolicy` Defines how this Adapter wants to restore its state after a view reconstruction (e.g. configuration change).
`public abstract class RecyclerView.AdapterDataObserver` Observer base class for watching changes to an `Adapter`.
`public interface RecyclerView.ChildDrawingOrderCallback` A callback interface that can be used to alter the drawing order of RecyclerView children.
`public class RecyclerView.EdgeEffectFactory` EdgeEffectFactory lets you customize the over-scroll edge effect for RecyclerViews.
`@Retention(value = RetentionPolicy.SOURCE) @IntDef(value = ) public annotation RecyclerView.EdgeEffectFactory.EdgeDirection`
`public 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) public annotation RecyclerView.ItemAnimator.AdapterChanges` The set of flags that might be passed to `recordPreLayoutInformation`.
`public interface RecyclerView.ItemAnimator.ItemAnimatorFinishedListener` This interface is used to inform listeners when all pending or running animations in an ItemAnimator are finished.
`public class RecyclerView.ItemAnimator.ItemHolderInfo` A simple data structure that holds information about an item's bounds.
`public 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.
`public 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.
`public interface RecyclerView.LayoutManager.LayoutPrefetchRegistry` Interface for LayoutManagers to request items to be prefetched, based on position, with specified distance from viewport, which indicates priority.
`public class RecyclerView.LayoutManager.Properties` Some general properties that a LayoutManager may want to use.
`public class RecyclerView.LayoutParams extends ViewGroup.MarginLayoutParams` `LayoutParams` subclass for children of `RecyclerView`.
`public 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.
`public abstract class RecyclerView.OnFlingListener` This class defines the behavior of fling if the developer wishes to handle it.
`public 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.
`public abstract class RecyclerView.OnScrollListener` An OnScrollListener can be added to a RecyclerView to receive messages when a scrolling event has occurred on that RecyclerView.
`public class RecyclerView.RecycledViewPool` RecycledViewPool lets you share Views between multiple RecyclerViews.
`public final inner class RecyclerView.Recycler` A Recycler is responsible for managing scrapped or detached item views for reuse.
`public interface RecyclerView.RecyclerListener` A RecyclerListener can be set on a RecyclerView to receive messages whenever a view is recycled.
`public class RecyclerView.SimpleOnItemTouchListener implements RecyclerView.OnItemTouchListener` An implementation of `RecyclerView.OnItemTouchListener` that has empty method bodies and default return values.
`public abstract class RecyclerView.SmoothScroller` Base class for smooth scrolling.
`public class RecyclerView.SmoothScroller.Action` Holds information about a smooth scroll request by a `SmoothScroller`.
`public 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.
`public class RecyclerView.State` Contains useful information about the current RecyclerView state like target scroll position or view focus.
`public abstract class RecyclerView.ViewCacheExtension` ViewCacheExtension is a helper class to provide an additional layer of view caching that can be controlled by the developer.
`public abstract class RecyclerView.ViewHolder` A ViewHolder describes an item view and metadata about its place within the RecyclerView.

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

Public constructors
`RecyclerView(@NonNull Context context)`
`RecyclerView(@NonNull Context context, @Nullable AttributeSet attrs)`
`RecyclerView( @NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr )`

Public methods
`void`	`addFocusables(ArrayList<View> views, int direction, int focusableMode)`
`void`	`addItemDecoration(@NonNull RecyclerView.ItemDecoration decor)` Add an `ItemDecoration` to this RecyclerView.
`void`	`addItemDecoration(@NonNull RecyclerView.ItemDecoration decor, int index)` Add an `ItemDecoration` to this RecyclerView.
`void`	`addOnChildAttachStateChangeListener( @NonNull RecyclerView.OnChildAttachStateChangeListener listener )` Register a listener that will be notified whenever a child view is attached to or detached from RecyclerView.
`void`	`addOnItemTouchListener( @NonNull RecyclerView.OnItemTouchListener listener )` Add an `OnItemTouchListener` to intercept touch events before they are dispatched to child views or this view's standard scrolling behavior.
`void`	`addOnScrollListener(@NonNull RecyclerView.OnScrollListener listener)` Add a listener that will be notified of any changes in scroll state or position.
`void`	`addRecyclerListener(@NonNull RecyclerView.RecyclerListener listener)` Register a listener that will be notified whenever a child view is recycled.
`void`	`clearOnChildAttachStateChangeListeners()` Removes all listeners that were added via `addOnChildAttachStateChangeListener`.
`void`	`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(@Nullable KeyEvent event)`
`boolean`	`dispatchNestedFling(float velocityX, float velocityY, boolean consumed)`
`boolean`	`dispatchNestedPreFling(float velocityX, float velocityY)`
`boolean`	`dispatchNestedPreScroll( int dx, int dy, int[] consumed, int[] offsetInWindow )`
`boolean`	`dispatchNestedPreScroll( int dx, int dy, int[] consumed, int[] offsetInWindow, int type )` Dispatch one step of a nested scroll in progress before this view consumes any portion of it.
`boolean`	`dispatchNestedScroll( int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int[] offsetInWindow )`
`boolean`	`dispatchNestedScroll( int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int[] offsetInWindow, int type )` Dispatch one step of a nested scroll in progress.
`final void`	`dispatchNestedScroll( int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int[] offsetInWindow, int type, @NonNull int[] consumed )` Dispatch one step of a nested scroll in progress.
`boolean`	`dispatchPopulateAccessibilityEvent(AccessibilityEvent event)`
`void`	`draw(@NonNull Canvas c)`
`boolean`	`drawChild(@NonNull Canvas canvas, View child, long drawingTime)`
`@Nullable View`	`findChildViewUnder(float x, float y)` Find the topmost view under the given point.
`@Nullable View`	`findContainingItemView(@NonNull View view)` Traverses the ancestors of the given view and returns the item view that contains it and also a direct child of the RecyclerView.
`@Nullable RecyclerView.ViewHolder`	`findContainingViewHolder(@NonNull View view)` Returns the ViewHolder that contains the given view.
`@Nullable RecyclerView.ViewHolder`	`findViewHolderForAdapterPosition(int position)` Return the ViewHolder for the item in the given position of the data set.
`RecyclerView.ViewHolder`	`findViewHolderForItemId(long id)` Return the ViewHolder for the item with the given id.
`@Nullable RecyclerView.ViewHolder`	`findViewHolderForLayoutPosition(int position)` Return the ViewHolder for the item in the given position of the data set as of the latest layout pass.
`@Nullable RecyclerView.ViewHolder`	`findViewHolderForPosition(int position)` This method is deprecated. use `findViewHolderForLayoutPosition` or `findViewHolderForAdapterPosition`
`boolean`	`fling(int velocityX, int velocityY)` Begin a standard fling with an initial velocity along each axis in pixels per second.
`View`	`focusSearch(View focused, int direction)` 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(AttributeSet attrs)`
`CharSequence`	`getAccessibilityClassName()`
`@Nullable 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(@NonNull View child)` Return the adapter position that the given child view corresponds to.
`long`	`getChildItemId(@NonNull View child)` Return the stable item id that the given child view corresponds to.
`int`	`getChildLayoutPosition(@NonNull View child)` Return the adapter position of the given child view as of the latest completed layout pass.
`int`	`getChildPosition(@NonNull View child)` This method is deprecated. use `getChildAdapterPosition` or `getChildLayoutPosition`.
`RecyclerView.ViewHolder`	`getChildViewHolder(@NonNull View child)` 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.
`@Nullable RecyclerViewAccessibilityDelegate`	`getCompatAccessibilityDelegate()` Returns the accessibility delegate compatibility implementation used by the RecyclerView.
`void`	`getDecoratedBoundsWithMargins(@NonNull View view, @NonNull Rect outBounds)` Returns the bounds of the view including its decoration and margins.
`@NonNull RecyclerView.EdgeEffectFactory`	`getEdgeEffectFactory()` Retrieves the previously set `EdgeEffectFactory` or the default factory if nothing was set.
`@Nullable RecyclerView.ItemAnimator`	`getItemAnimator()` Gets the current ItemAnimator for this RecyclerView.
`@NonNull RecyclerView.ItemDecoration`	`getItemDecorationAt(int index)` Returns an `ItemDecoration` previously added to this RecyclerView.
`int`	`getItemDecorationCount()` Returns the number of `ItemDecoration` currently added to this RecyclerView.
`@Nullable 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.
`@Nullable 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.
`@NonNull RecyclerView.RecycledViewPool`	`getRecycledViewPool()` Retrieve this RecyclerView's `RecycledViewPool`.
`int`	`getScrollState()` Return the current scrolling state of the RecyclerView.
`boolean`	`hasFixedSize()`
`boolean`	`hasNestedScrollingParent()`
`boolean`	`hasNestedScrollingParent(int type)` 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.
`void`	`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 method is deprecated. Use `isLayoutSuppressed`.
`final boolean`	`isLayoutSuppressed()` Returns whether layout and scroll calls on this container are currently being suppressed, due to an earlier call to `suppressLayout`.
`boolean`	`isNestedScrollingEnabled()`
`void`	`nestedScrollBy(int x, int y)` Same as `scrollBy`, but also participates in nested scrolling.
`void`	`offsetChildrenHorizontal(@Px int dx)` Offset the bounds of all child views by `dx` pixels.
`void`	`offsetChildrenVertical(@Px int dy)` Offset the bounds of all child views by `dy` pixels.
`void`	`onChildAttachedToWindow(@NonNull View child)` Called when an item view is attached to this RecyclerView.
`void`	`onChildDetachedFromWindow(@NonNull View child)` Called when an item view is detached from this RecyclerView.
`void`	`onDraw(@NonNull Canvas c)`
`boolean`	`onGenericMotionEvent(MotionEvent event)`
`boolean`	`onInterceptTouchEvent(MotionEvent e)`
`void`	`onScrollStateChanged(int state)` Called when the scroll state of this RecyclerView changes.
`void`	`onScrolled(@Px int dx, @Px int dy)` Called when the scroll position of this RecyclerView changes.
`boolean`	`onTouchEvent(MotionEvent e)`
`void`	`removeItemDecoration(@NonNull RecyclerView.ItemDecoration decor)` Remove an `ItemDecoration` from this RecyclerView.
`void`	`removeItemDecorationAt(int index)` Removes the `ItemDecoration` associated with the supplied index position.
`void`	`removeOnChildAttachStateChangeListener( @NonNull RecyclerView.OnChildAttachStateChangeListener listener )` Removes the provided listener from child attached state listeners list.
`void`	`removeOnItemTouchListener( @NonNull RecyclerView.OnItemTouchListener listener )` Remove an `OnItemTouchListener`.
`void`	`removeOnScrollListener(@NonNull RecyclerView.OnScrollListener listener)` Remove a listener that was notified of any changes in scroll state or position.
`void`	`removeRecyclerListener(@NonNull RecyclerView.RecyclerListener listener)` Removes the provided listener from RecyclerListener list.
`void`	`requestChildFocus(View child, View focused)`
`boolean`	`requestChildRectangleOnScreen(View child, Rect rect, boolean immediate)`
`void`	`requestDisallowInterceptTouchEvent(boolean disallowIntercept)`
`void`	`requestLayout()`
`void`	`scrollBy(int x, int y)`
`void`	`scrollTo(int x, int y)`
`void`	`scrollToPosition(int position)` Convenience method to scroll to a certain position.
`void`	`sendAccessibilityEventUnchecked(AccessibilityEvent event)`
`void`	`setAccessibilityDelegateCompat( @Nullable RecyclerViewAccessibilityDelegate accessibilityDelegate )` Sets the accessibility delegate compatibility implementation used by RecyclerView.
`void`	`setAdapter(@Nullable RecyclerView.Adapter adapter)` Set a new adapter to provide child views on demand.
`void`	`setChildDrawingOrderCallback( @Nullable RecyclerView.ChildDrawingOrderCallback childDrawingOrderCallback )` Sets the `ChildDrawingOrderCallback` to be used for drawing children.
`void`	`setClipToPadding(boolean clipToPadding)`
`static void`	`setDebugAssertionsEnabled(boolean debugAssertionsEnabled)` Enable internal assertions about RecyclerView's state and throw exceptions if the assertions are violated.
`void`	`setEdgeEffectFactory( @NonNull RecyclerView.EdgeEffectFactory edgeEffectFactory )` Set a `EdgeEffectFactory` for this `RecyclerView`.
`void`	`setHasFixedSize(boolean hasFixedSize)` RecyclerView can perform several optimizations if it can know in advance that RecyclerView's size is not affected by the adapter contents.
`void`	`setItemAnimator(@Nullable RecyclerView.ItemAnimator animator)` Sets the `ItemAnimator` that will handle animations involving changes to the items in this RecyclerView.
`void`	`setItemViewCacheSize(int size)` Set the number of offscreen views to retain before adding them to the potentially shared `recycled view pool`.
`void`	`setLayoutFrozen(boolean frozen)` This method is deprecated. Use `suppressLayout`.
`void`	`setLayoutManager(@Nullable RecyclerView.LayoutManager layout)` Set the `LayoutManager` that this RecyclerView will use.
`void`	`setLayoutTransition(LayoutTransition transition)` This method is deprecated. Use `setItemAnimator` ()}.
`void`	`setNestedScrollingEnabled(boolean enabled)`
`void`	`setOnFlingListener( @Nullable RecyclerView.OnFlingListener onFlingListener )` Set a `OnFlingListener` for this `RecyclerView`.
`void`	`setOnScrollListener(@Nullable RecyclerView.OnScrollListener listener)` This method is deprecated. Use `addOnScrollListener` and `removeOnScrollListener`
`void`	`setPreserveFocusAfterLayout(boolean preserveFocusAfterLayout)` Set whether the RecyclerView should try to keep the same Item focused after a layout calculation or not.
`void`	`setRecycledViewPool(@Nullable RecyclerView.RecycledViewPool pool)` Recycled view pools allow multiple RecyclerViews to share a common pool of scrap views.
`void`	`setRecyclerListener(@Nullable RecyclerView.RecyclerListener listener)` This method is deprecated. Use `addRecyclerListener` and `removeRecyclerListener`
`void`	`setScrollingTouchSlop(int slopConstant)` Configure the scrolling touch slop for a specific use case.
`static void`	`setVerboseLoggingEnabled(boolean verboseLoggingEnabled)` Enable verbose logging within RecyclerView itself.
`void`	`setViewCacheExtension( @Nullable RecyclerView.ViewCacheExtension extension )` Sets a new `ViewCacheExtension` to be used by the Recycler.
`void`	`smoothScrollBy(@Px int dx, @Px int dy)` Animate a scroll by the given amount of pixels along either axis.
`void`	`smoothScrollBy(@Px int dx, @Px int dy, @Nullable Interpolator interpolator)` Animate a scroll by the given amount of pixels along either axis.
`void`	`smoothScrollBy( @Px int dx, @Px int dy, @Nullable Interpolator interpolator, int duration )` Smooth scrolls the RecyclerView by a given distance.
`void`	`smoothScrollToPosition(int position)` Starts a smooth scroll to an adapter position.
`boolean`	`startNestedScroll(int axes)`
`boolean`	`startNestedScroll(int axes, int type)` Begin a nestable scroll operation along the given axes, for the given input type.
`void`	`stopNestedScroll()`
`void`	`stopNestedScroll(int type)` Stop a nested scroll in progress for the given input type.
`void`	`stopScroll()` Stop any current scroll in progress, such as one started by `smoothScrollBy`, `fling` or a touch-initiated fling.
`final void`	`suppressLayout(boolean suppress)` Tells this RecyclerView to suppress all layout and scroll calls until layout suppression is disabled with a later call to suppressLayout(false).
`void`	`swapAdapter( @Nullable RecyclerView.Adapter adapter, boolean removeAndRecycleExistingViews )` Swaps the current adapter with the provided one.

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

Inherited Constants

From android.view.View

`static final int`	`ACCESSIBILITY_DATA_SENSITIVE_AUTO = 0`
`static final int`	`ACCESSIBILITY_DATA_SENSITIVE_NO = 2`
`static final int`	`ACCESSIBILITY_DATA_SENSITIVE_YES = 1`
`static final int`	`ACCESSIBILITY_LIVE_REGION_ASSERTIVE = 2`
`static final int`	`ACCESSIBILITY_LIVE_REGION_NONE = 0`
`static final int`	`ACCESSIBILITY_LIVE_REGION_POLITE = 1`
`static final Property<View, Float>`	`ALPHA`
`static final int`	`AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS = 1`
`static final String`	`AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DATE = "creditCardExpirationDate"`
`static final String`	`AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DAY = "creditCardExpirationDay"`
`static final String`	`AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_MONTH = "creditCardExpirationMonth"`
`static final String`	`AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_YEAR = "creditCardExpirationYear"`
`static final String`	`AUTOFILL_HINT_CREDIT_CARD_NUMBER = "creditCardNumber"`
`static final String`	`AUTOFILL_HINT_CREDIT_CARD_SECURITY_CODE = "creditCardSecurityCode"`
`static final String`	`AUTOFILL_HINT_EMAIL_ADDRESS = "emailAddress"`
`static final String`	`AUTOFILL_HINT_NAME = "name"`
`static final String`	`AUTOFILL_HINT_PASSWORD = "password"`
`static final String`	`AUTOFILL_HINT_PHONE = "phone"`
`static final String`	`AUTOFILL_HINT_POSTAL_ADDRESS = "postalAddress"`
`static final String`	`AUTOFILL_HINT_POSTAL_CODE = "postalCode"`
`static final String`	`AUTOFILL_HINT_USERNAME = "username"`
`static final int`	`AUTOFILL_TYPE_DATE = 4`
`static final int`	`AUTOFILL_TYPE_LIST = 3`
`static final int`	`AUTOFILL_TYPE_NONE = 0`
`static final int`	`AUTOFILL_TYPE_TEXT = 1`
`static final int`	`AUTOFILL_TYPE_TOGGLE = 2`
`static final int`	`DRAG_FLAG_ACCESSIBILITY_ACTION = 1024`
`static final int`	`DRAG_FLAG_GLOBAL = 256`
`static final int`	`DRAG_FLAG_GLOBAL_PERSISTABLE_URI_PERMISSION = 64`
`static final int`	`DRAG_FLAG_GLOBAL_PREFIX_URI_PERMISSION = 128`
`static final int`	`DRAG_FLAG_GLOBAL_URI_READ = 1`
`static final int`	`DRAG_FLAG_GLOBAL_URI_WRITE = 2`
`static final int`	`DRAG_FLAG_OPAQUE = 512`
`static final int`	`DRAWING_CACHE_QUALITY_AUTO = 0` This field is deprecated.
`static final int`	`DRAWING_CACHE_QUALITY_HIGH = 1048576` This field is deprecated.
`static final int`	`DRAWING_CACHE_QUALITY_LOW = 524288` This field is deprecated.
`static final int[]`	`EMPTY_STATE_SET`
`static final int[]`	`ENABLED_FOCUSED_SELECTED_STATE_SET`
`static final int[]`	`ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET`
`static final int[]`	`ENABLED_FOCUSED_STATE_SET`
`static final int[]`	`ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET`
`static final int[]`	`ENABLED_SELECTED_STATE_SET`
`static final int[]`	`ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET`
`static final int[]`	`ENABLED_STATE_SET`
`static final int[]`	`ENABLED_WINDOW_FOCUSED_STATE_SET`
`static final int`	`FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 2`
`static final int`	`FIND_VIEWS_WITH_TEXT = 1`
`static final int`	`FOCUSABLE = 1`
`static final int`	`FOCUSABLES_ALL = 0`
`static final int`	`FOCUSABLES_TOUCH_MODE = 1`
`static final int`	`FOCUSABLE_AUTO = 16`
`static final int[]`	`FOCUSED_SELECTED_STATE_SET`
`static final int[]`	`FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET`
`static final int[]`	`FOCUSED_STATE_SET`
`static final int[]`	`FOCUSED_WINDOW_FOCUSED_STATE_SET`
`static final int`	`FOCUS_BACKWARD = 1`
`static final int`	`FOCUS_DOWN = 130`
`static final int`	`FOCUS_FORWARD = 2`
`static final int`	`FOCUS_LEFT = 17`
`static final int`	`FOCUS_RIGHT = 66`
`static final int`	`FOCUS_UP = 33`
`static final int`	`GONE = 8`
`static final int`	`HAPTIC_FEEDBACK_ENABLED = 268435456`
`static final int`	`IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0`
`static final int`	`IMPORTANT_FOR_ACCESSIBILITY_NO = 2`
`static final int`	`IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS = 4`
`static final int`	`IMPORTANT_FOR_ACCESSIBILITY_YES = 1`
`static final int`	`IMPORTANT_FOR_AUTOFILL_AUTO = 0`
`static final int`	`IMPORTANT_FOR_AUTOFILL_NO = 2`
`static final int`	`IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS = 8`
`static final int`	`IMPORTANT_FOR_AUTOFILL_YES = 1`
`static final int`	`IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS = 4`
`static final int`	`IMPORTANT_FOR_CONTENT_CAPTURE_AUTO = 0`
`static final int`	`IMPORTANT_FOR_CONTENT_CAPTURE_NO = 2`
`static final int`	`IMPORTANT_FOR_CONTENT_CAPTURE_NO_EXCLUDE_DESCENDANTS = 8`
`static final int`	`IMPORTANT_FOR_CONTENT_CAPTURE_YES = 1`
`static final int`	`IMPORTANT_FOR_CONTENT_CAPTURE_YES_EXCLUDE_DESCENDANTS = 4`
`static final int`	`INVISIBLE = 4`
`static final int`	`KEEP_SCREEN_ON = 67108864`
`static final int`	`LAYER_TYPE_HARDWARE = 2`
`static final int`	`LAYER_TYPE_NONE = 0`
`static final int`	`LAYER_TYPE_SOFTWARE = 1`
`static final int`	`LAYOUT_DIRECTION_INHERIT = 2`
`static final int`	`LAYOUT_DIRECTION_LOCALE = 3`
`static final int`	`LAYOUT_DIRECTION_LTR = 0`
`static final int`	`LAYOUT_DIRECTION_RTL = 1`
`static final int`	`MEASURED_HEIGHT_STATE_SHIFT = 16`
`static final int`	`MEASURED_SIZE_MASK = 16777215`
`static final int`	`MEASURED_STATE_MASK = -16777216`
`static final int`	`MEASURED_STATE_TOO_SMALL = 16777216`
`static final int`	`NOT_FOCUSABLE = 0`
`static final int`	`NO_ID = -1`
`static final int`	`OVER_SCROLL_ALWAYS = 0`
`static final int`	`OVER_SCROLL_IF_CONTENT_SCROLLS = 1`
`static final int`	`OVER_SCROLL_NEVER = 2`
`static final int[]`	`PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET`
`static final int[]`	`PRESSED_ENABLED_FOCUSED_`

RecyclerView

Glossary of terms:

Positions in RecyclerView:

Presenting Dynamic Data

Summary

Nested types

Constants

Public constructors

Public methods

Protected methods

Inherited Constants