LinearLayoutManager

Artifact: androidx.recyclerview:recyclerview

Added in 1.0.0

Kotlin |Java

public class LinearLayoutManager extends RecyclerView.LayoutManager implements ItemTouchHelper.ViewDropHandler, RecyclerView.SmoothScroller.ScrollVectorProvider

java.lang.Object
↳	androidx.recyclerview.widget.RecyclerView.LayoutManager
	↳	androidx.recyclerview.widget.LinearLayoutManager

Known direct subclasses

GridLayoutManager, WearableLinearLayoutManager

`GridLayoutManager`	A `RecyclerView.LayoutManager` implementations that lays out items in a grid.
`WearableLinearLayoutManager`	This wear-specific implementation of `LinearLayoutManager` provides basic offsetting logic for updating child layout.

A RecyclerView.LayoutManager implementation which provides similar functionality to android.widget.ListView.

Summary

Nested types
`protected class LinearLayoutManager.LayoutChunkResult`

Constants
`static final int`	`HORIZONTAL = 0`
`static final int`	`INVALID_OFFSET = -2147483648`
`static final int`	`VERTICAL = 1`

Public constructors
`LinearLayoutManager(Context context)` Creates a vertical LinearLayoutManager
`LinearLayoutManager( Context context, int orientation, boolean reverseLayout )`
`LinearLayoutManager( Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes )` Constructor used when layout manager is set in XML by RecyclerView attribute "layoutManager".

Public methods
`void`	`assertNotInLayoutOrScroll(String message)` Checks if RecyclerView is in the middle of a layout or scroll and throws an `IllegalStateException` if it is.
`boolean`	`canScrollHorizontally()`
`boolean`	`canScrollVertically()`
`void`	`collectAdjacentPrefetchPositions( int dx, int dy, RecyclerView.State state, RecyclerView.LayoutManager.LayoutPrefetchRegistry layoutPrefetchRegistry )` Gather all positions from the LayoutManager to be prefetched, given specified momentum.
`void`	`collectInitialPrefetchPositions( int adapterItemCount, RecyclerView.LayoutManager.LayoutPrefetchRegistry layoutPrefetchRegistry )` Gather all positions from the LayoutManager to be prefetched in preperation for its RecyclerView to come on screen, due to the movement of another, containing RecyclerView.
`int`	`computeHorizontalScrollExtent(RecyclerView.State state)` Override this method if you want to support scroll bars.
`int`	`computeHorizontalScrollOffset(RecyclerView.State state)` Override this method if you want to support scroll bars.
`int`	`computeHorizontalScrollRange(RecyclerView.State state)` Override this method if you want to support scroll bars.
`PointF`	`computeScrollVectorForPosition(int targetPosition)` Should calculate the vector that points to the direction where the target position can be found.
`int`	`computeVerticalScrollExtent(RecyclerView.State state)` Override this method if you want to support scroll bars.
`int`	`computeVerticalScrollOffset(RecyclerView.State state)` Override this method if you want to support scroll bars.
`int`	`computeVerticalScrollRange(RecyclerView.State state)` Override this method if you want to support scroll bars.
`int`	`findFirstCompletelyVisibleItemPosition()` Returns the adapter position of the first fully visible view.
`int`	`findFirstVisibleItemPosition()` Returns the adapter position of the first visible view.
`int`	`findLastCompletelyVisibleItemPosition()` Returns the adapter position of the last fully visible view.
`int`	`findLastVisibleItemPosition()` Returns the adapter position of the last visible view.
`View`	`findViewByPosition(int position)` Finds the view which represents the given adapter position.
`RecyclerView.LayoutParams`	`generateDefaultLayoutParams()` Create a default `LayoutParams` object for a child of the RecyclerView.
`int`	`getInitialPrefetchItemCount()` Gets the number of items to prefetch in `collectInitialPrefetchPositions`, which defines how many inner items should be prefetched when this LayoutManager's RecyclerView is nested inside another RecyclerView.
`int`	`getOrientation()` Returns the current orientation of the layout.
`boolean`	`getRecycleChildrenOnDetach()` Returns whether LayoutManager will recycle its children when it is detached from RecyclerView.
`boolean`	`getReverseLayout()` Returns if views are laid out from the opposite direction of the layout.
`boolean`	`getStackFromEnd()`
`boolean`	`isAutoMeasureEnabled()` Returns whether the measuring pass of layout should use the AutoMeasure mechanism of `RecyclerView` or if it should be done by the LayoutManager's implementation of `onMeasure`.
`boolean`	`isLayoutReversed()` Query if the layout is in reverse order.
`boolean`	`isSmoothScrollbarEnabled()` Returns the current state of the smooth scrollbar feature.
`void`	`onDetachedFromWindow(RecyclerView view, RecyclerView.Recycler recycler)` Called when this LayoutManager is detached from its parent RecyclerView or when its parent RecyclerView is detached from its window.
`View`	`onFocusSearchFailed( View focused, int direction, RecyclerView.Recycler recycler, RecyclerView.State state )` Called when searching for a focusable view in the given direction has failed for the current content of the RecyclerView.
`void`	`onInitializeAccessibilityEvent(AccessibilityEvent event)`
`void`	`onInitializeAccessibilityNodeInfo( @NonNull RecyclerView.Recycler recycler, @NonNull RecyclerView.State state, @NonNull AccessibilityNodeInfoCompat info )` Called by the AccessibilityDelegate when the information about the current layout should be populated.
`void`	`onLayoutChildren( RecyclerView.Recycler recycler, RecyclerView.State state )` Lay out all relevant child views from the given adapter.
`void`	`onLayoutCompleted(RecyclerView.State state)` Called after a full layout calculation is finished.
`void`	`onRestoreInstanceState(Parcelable state)` Called when the RecyclerView is ready to restore the state based on a previous RecyclerView.
`Parcelable`	`onSaveInstanceState()` Called when the LayoutManager should save its state.
`void`	`prepareForDrop(@NonNull View view, @NonNull View target, int x, int y)` Called by the after a View is dropped over another View.
`int`	`scrollHorizontallyBy( int dx, RecyclerView.Recycler recycler, RecyclerView.State state )` Scroll horizontally by dx pixels in screen coordinates and return the distance traveled.
`void`	`scrollToPosition(int position)` Scroll the RecyclerView to make the position visible.
`void`	`scrollToPositionWithOffset(int position, int offset)` Scroll to the specified adapter position with the given offset from resolved layout start.
`int`	`scrollVerticallyBy( int dy, RecyclerView.Recycler recycler, RecyclerView.State state )` Scroll vertically by dy pixels in screen coordinates and return the distance traveled.
`void`	`setInitialPrefetchItemCount(int itemCount)` Sets the number of items to prefetch in `collectInitialPrefetchPositions`, which defines how many inner items should be prefetched when this LayoutManager's RecyclerView is nested inside another RecyclerView.
`void`	`setOrientation(int orientation)` Sets the orientation of the layout.
`void`	`setRecycleChildrenOnDetach(boolean recycleChildrenOnDetach)` Set whether LayoutManager will recycle its children when it is detached from RecyclerView.
`void`	`setReverseLayout(boolean reverseLayout)` Used to reverse item traversal and layout order.
`void`	`setSmoothScrollbarEnabled(boolean enabled)` When smooth scrollbar is enabled, the position and size of the scrollbar thumb is computed based on the number of visible pixels in the visible items.
`void`	`setStackFromEnd(boolean stackFromEnd)` Compatibility support for `setStackFromBottom`
`void`	`smoothScrollToPosition( RecyclerView recyclerView, RecyclerView.State state, int position )` Smooth scroll to the specified adapter position.
`boolean`	`supportsPredictiveItemAnimations()` Returns whether this LayoutManager supports "predictive item animations".

Protected methods
`void`	`calculateExtraLayoutSpace( @NonNull RecyclerView.State state, @NonNull int[] extraLayoutSpace )` Calculates the amount of extra space (in pixels) that should be laid out by and stores the result in `extraLayoutSpace`.
`int`	`getExtraLayoutSpace(RecyclerView.State state)` This method is deprecated. Use `calculateExtraLayoutSpace` instead.
`boolean`	`isLayoutRTL()`

Protected methods

void

calculateExtraLayoutSpace(
    @NonNull RecyclerView.State state,
    @NonNull int[] extraLayoutSpace
)

Calculates the amount of extra space (in pixels) that should be laid out by and stores the result in extraLayoutSpace.

int

getExtraLayoutSpace(RecyclerView.State state)

This method is deprecated.

Use calculateExtraLayoutSpace instead.

boolean

isLayoutRTL()

Inherited methods

From androidx.recyclerview.widget.RecyclerView.LayoutManager

`void`	`addDisappearingView(View child)` To be called only during `onLayoutChildren` to add a view to the layout that is known to be going away, either because it has been `removed` or because it is actually not in the visible portion of the container but is being laid out in order to inform RecyclerView in how to animate the item out of view.
`void`	`addDisappearingView(View child, int index)` To be called only during `onLayoutChildren` to add a view to the layout that is known to be going away, either because it has been `removed` or because it is actually not in the visible portion of the container but is being laid out in order to inform RecyclerView in how to animate the item out of view.
`void`	`addView(View child)` Add a view to the currently attached RecyclerView if needed.
`void`	`addView(View child, int index)` Add a view to the currently attached RecyclerView if needed.
`void`	`assertInLayoutOrScroll(String message)` Checks if RecyclerView is in the middle of a layout or scroll and throws an `IllegalStateException` if it is not.
`void`	`attachView(@NonNull View child)` Reattach a previously `detached` view.
`void`	`attachView(@NonNull View child, int index)` Reattach a previously `detached` view.
`void`	`attachView(@NonNull View child, int index, RecyclerView.LayoutParams lp)` Reattach a previously `detached` view.
`void`	`calculateItemDecorationsForChild( @NonNull View child, @NonNull Rect outRect )` Calculates the item decor insets applied to the given child and updates the provided Rect instance with the inset values.
`boolean`	`checkLayoutParams(RecyclerView.LayoutParams lp)` Determines the validity of the supplied LayoutParams object.
`static int`	`chooseSize(int spec, int desired, int min)` Chooses a size from the given specs and parameters that is closest to the desired size and also complies with the spec.
`void`	`detachAndScrapAttachedViews(@NonNull RecyclerView.Recycler recycler)` Temporarily detach and scrap all currently attached child views.
`void`	`detachAndScrapView( @NonNull View child, @NonNull RecyclerView.Recycler recycler )` Detach a child view and add it to a `Recycler's` scrap heap.
`void`	`detachAndScrapViewAt(int index, @NonNull RecyclerView.Recycler recycler)` Detach a child view and add it to a `Recycler's` scrap heap.
`void`	`detachView(@NonNull View child)` Temporarily detach a child view.
`void`	`detachViewAt(int index)` Temporarily detach a child view.
`void`	`endAnimation(View view)` Ends all animations on the view created by the `ItemAnimator`.
`@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 LayoutManager.
`RecyclerView.LayoutParams`	`generateLayoutParams(ViewGroup.LayoutParams lp)` Create a LayoutParams object suitable for this LayoutManager, copying relevant values from the supplied LayoutParams object if possible.
`RecyclerView.LayoutParams`	`generateLayoutParams(Context c, AttributeSet attrs)` Create a LayoutParams object suitable for this LayoutManager from an inflated layout resource.
`int`	`getBaseline()` Returns offset of the RecyclerView's text baseline from the its top boundary.
`int`	`getBottomDecorationHeight(@NonNull View child)` Returns the total height of item decorations applied to child's bottom.
`@Nullable View`	`getChildAt(int index)` Return the child view at the given index
`int`	`getChildCount()` Return the current number of child views attached to the parent RecyclerView.
`static int`	`getChildMeasureSpec( int parentSize, int padding, int childDimension, boolean canScroll )` This method is deprecated. use `getChildMeasureSpec`
`static int`	`getChildMeasureSpec( int parentSize, int parentMode, int padding, int childDimension, boolean canScroll )` Calculate a MeasureSpec value for measuring a child view in one dimension.
`boolean`	`getClipToPadding()` Check if the RecyclerView is configured to clip child views to its padding.
`int`	`getColumnCountForAccessibility( @NonNull RecyclerView.Recycler recycler, @NonNull RecyclerView.State state )` Returns the number of columns for accessibility.
`int`	`getDecoratedBottom(@NonNull View child)` Returns the bottom edge of the given child view within its parent, offset by any applied `ItemDecorations`.
`void`	`getDecoratedBoundsWithMargins(@NonNull View view, @NonNull Rect outBounds)` Returns the bounds of the view including its decoration and margins.
`int`	`getDecoratedLeft(@NonNull View child)` Returns the left edge of the given child view within its parent, offset by any applied `ItemDecorations`.
`int`	`getDecoratedMeasuredHeight(@NonNull View child)` Returns the measured height of the given child, plus the additional size of any insets applied by `ItemDecorations`.
`int`	`getDecoratedMeasuredWidth(@NonNull View child)` Returns the measured width of the given child, plus the additional size of any insets applied by `ItemDecorations`.
`int`	`getDecoratedRight(@NonNull View child)` Returns the right edge of the given child view within its parent, offset by any applied `ItemDecorations`.
`int`	`getDecoratedTop(@NonNull View child)` Returns the top edge of the given child view within its parent, offset by any applied `ItemDecorations`.
`@Nullable View`	`getFocusedChild()` Returns the item View which has or contains focus.
`@Px int`	`getHeight()` Returns the height that is currently relevant to the LayoutManager.
`int`	`getHeightMode()` Return the height measurement spec mode that is currently relevant to the LayoutManager.
`int`	`getItemCount()` Returns the number of items in the adapter bound to the parent RecyclerView.
`int`	`getItemViewType(@NonNull View view)` Returns the View type defined by the adapter.
`int`	`getLayoutDirection()` Returns the resolved layout direction for this RecyclerView.
`int`	`getLeftDecorationWidth(@NonNull View child)` Returns the total width of item decorations applied to child's left.
`@Px int`	`getMinimumHeight()`
`@Px int`	`getMinimumWidth()`
`@Px int`	`getPaddingBottom()` Return the bottom padding of the parent RecyclerView
`@Px int`	`getPaddingEnd()` Return the end padding of the parent RecyclerView
`@Px int`	`getPaddingLeft()` Return the left padding of the parent RecyclerView
`@Px int`	`getPaddingRight()` Return the right padding of the parent RecyclerView
`@Px int`	`getPaddingStart()` Return the start padding of the parent RecyclerView
`@Px int`	`getPaddingTop()` Return the top padding of the parent RecyclerView
`int`	`getPosition(@NonNull View view)` Returns the adapter position of the item represented by the given View.
`static RecyclerView.LayoutManager.Properties`	`getProperties( @NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes )` Parse the xml attributes to get the most common properties used by layout managers.
`int`	`getRightDecorationWidth(@NonNull View child)` Returns the total width of item decorations applied to child's right.
`int`	`getRowCountForAccessibility( @NonNull RecyclerView.Recycler recycler, @NonNull RecyclerView.State state )` Returns the number of rows for accessibility.
`int`	`getSelectionModeForAccessibility( @NonNull RecyclerView.Recycler recycler, @NonNull RecyclerView.State state )` Returns the selection mode for accessibility.
`int`	`getTopDecorationHeight(@NonNull View child)` Returns the total height of item decorations applied to child's top.
`void`	`getTransformedBoundingBox( @NonNull View child, boolean includeDecorInsets, @NonNull Rect out )` Calculates the bounding box of the View while taking into account its matrix changes (translation, scale etc) with respect to the RecyclerView.
`@Px int`	`getWidth()` Returns the width that is currently relevant to the LayoutManager.
`int`	`getWidthMode()` Return the width measurement spec mode that is currently relevant to the LayoutManager.
`boolean`	`hasFocus()` Returns true if the RecyclerView this LayoutManager is bound to has or contains focus.
`void`	`ignoreView(@NonNull View view)` Flags a view so that it will not be scrapped or recycled.
`boolean`	`isAttachedToWindow()` Returns whether LayoutManager is currently attached to a RecyclerView which is attached to a window.
`boolean`	`isFocused()` Returns true if the RecyclerView this LayoutManager is bound to has focus.
`final boolean`	`isItemPrefetchEnabled()` Sets whether the LayoutManager should be queried for views outside of its viewport while the UI thread is idle between frames.
`boolean`	`isLayoutHierarchical( @NonNull RecyclerView.Recycler recycler, @NonNull RecyclerView.State state )` Returns whether layout is hierarchical or not to be used for accessibility.
`boolean`	`isMeasurementCacheEnabled()` In addition to the View Framework's measurement cache, RecyclerView uses its own additional measurement cache for its children to avoid re-measuring them when not necessary.
`boolean`	`isSmoothScrolling()`
`boolean`	`isViewPartiallyVisible( @NonNull View child, boolean completelyVisible, boolean acceptEndPointInclusion )` Returns whether the given child view is partially or fully visible within the padded bounded area of RecyclerView, depending on the input parameters.
`void`	`layoutDecorated( @NonNull View child, int left, int top, int right, int bottom )` Lay out the given child view within the RecyclerView using coordinates that include any current `ItemDecorations`.
`void`	`layoutDecoratedWithMargins( @NonNull View child, int left, int top, int right, int bottom )` Lay out the given child view within the RecyclerView using coordinates that include any current `ItemDecorations` and margins.
`void`	`measureChild(@NonNull View child, int widthUsed, int heightUsed)` Measure a child view using standard measurement policy, taking the padding of the parent RecyclerView and any added item decorations into account.
`void`	`measureChildWithMargins( @NonNull View child, int widthUsed, int heightUsed )` Measure a child view using standard measurement policy, taking the padding of the parent RecyclerView, any added item decorations and the child margins into account.
`void`	`moveView(int fromIndex, int toIndex)` Moves a View from one position to another.
`void`	`offsetChildrenHorizontal(@Px int dx)` Offset all child views attached to the parent RecyclerView by dx pixels along the horizontal axis.
`void`	`offsetChildrenVertical(@Px int dy)` Offset all child views attached to the parent RecyclerView by dy pixels along the vertical axis.
`void`	`onAdapterChanged( @Nullable RecyclerView.Adapter oldAdapter, @Nullable RecyclerView.Adapter newAdapter )` Called if the RecyclerView this LayoutManager is bound to has a different adapter set via `setAdapter` or `swapAdapter`.
`boolean`	`onAddFocusables( @NonNull RecyclerView recyclerView, @NonNull ArrayList<View> views, int direction, int focusableMode )` Called to populate focusable views within the RecyclerView.
`void`	`@CallSuper onAttachedToWindow(RecyclerView view)` Called when this LayoutManager is both attached to a RecyclerView and that RecyclerView is attached to a window.
`void`	`onDetachedFromWindow(RecyclerView view)` This method is deprecated. override `onDetachedFromWindow`
`void`	`onInitializeAccessibilityEvent( @NonNull RecyclerView.Recycler recycler, @NonNull RecyclerView.State state, @NonNull AccessibilityEvent event )` Called by the accessibility delegate to initialize an accessibility event.
`void`	`onInitializeAccessibilityNodeInfoForItem( @NonNull RecyclerView.Recycler recycler, @NonNull RecyclerView.State state, @NonNull View host, @NonNull AccessibilityNodeInfoCompat info )` Called by the AccessibilityDelegate when the accessibility information for a specific item should be populated.
`@Nullable View`	`onInterceptFocusSearch(@NonNull View focused, int direction)` This method gives a LayoutManager an opportunity to intercept the initial focus search before the default behavior of `FocusFinder` is used.
`void`	`onItemsAdded( @NonNull RecyclerView recyclerView, int positionStart, int itemCount )` Called when items have been added to the adapter.
`void`	`onItemsChanged(@NonNull RecyclerView recyclerView)` Called in response to a call to `notifyDataSetChanged` or `swapAdapter` ()} and signals that the the entire data set has changed.
`void`	`onItemsMoved( @NonNull RecyclerView recyclerView, int from, int to, int itemCount )` Called when an item is moved withing the adapter.
`void`	`onItemsRemoved( @NonNull RecyclerView recyclerView, int positionStart, int itemCount )` Called when items have been removed from the adapter.
`void`	`onItemsUpdated( @NonNull RecyclerView recyclerView, int positionStart, int itemCount )` Called when items have been changed in the adapter.
`void`	`onItemsUpdated( @NonNull RecyclerView recyclerView, int positionStart, int itemCount, @Nullable Object payload )` Called when items have been changed in the adapter and with optional payload.
`void`	`onMeasure( @NonNull RecyclerView.Recycler recycler, @NonNull RecyclerView.State state, int widthSpec, int heightSpec )` Measure the attached RecyclerView.
`boolean`	`onRequestChildFocus( @NonNull RecyclerView parent, @NonNull View child, @Nullable View focused )` This method is deprecated. Use `onRequestChildFocus`
`boolean`	`onRequestChildFocus( @NonNull RecyclerView parent, @NonNull RecyclerView.State state, @NonNull View child, @Nullable View focused )` Called when a descendant view of the RecyclerView requests focus.
`void`	`onScrollStateChanged(int state)` RecyclerView calls this method to notify LayoutManager that scroll state has changed.
`boolean`	`performAccessibilityAction( @NonNull RecyclerView.Recycler recycler, @NonNull RecyclerView.State state, int action, @Nullable Bundle args )` Called by AccessibilityDelegate when an action is requested from the RecyclerView.
`boolean`	`performAccessibilityActionForItem( @NonNull RecyclerView.Recycler recycler, @NonNull RecyclerView.State state, @NonNull View view, int action, @Nullable Bundle args )` Called by AccessibilityDelegate when an accessibility action is requested on one of the children of LayoutManager.
`void`	`postOnAnimation(Runnable action)` Causes the Runnable to execute on the next animation time step.
`void`	`removeAllViews()` Remove all views from the currently attached RecyclerView.
`void`	`removeAndRecycleAllViews(@NonNull RecyclerView.Recycler recycler)` Removes all views and recycles them using the given recycler.
`void`	`removeAndRecycleView( @NonNull View child, @NonNull RecyclerView.Recycler recycler )` Remove a child view and recycle it using the given Recycler.
`void`	`removeAndRecycleViewAt( int index, @NonNull RecyclerView.Recycler recycler )` Remove a child view and recycle it using the given Recycler.
`boolean`	`removeCallbacks(Runnable action)` Removes the specified Runnable from the message queue.
`void`	`removeDetachedView(@NonNull View child)` Finish removing a view that was previously temporarily `detached`.
`void`	`removeView(View child)` Remove a view from the currently attached RecyclerView if needed.
`void`	`removeViewAt(int index)` Remove a view from the currently attached RecyclerView if needed.
`boolean`	`requestChildRectangleOnScreen( @NonNull RecyclerView parent, @NonNull View child, @NonNull Rect rect, boolean immediate )` Called when a child of the RecyclerView wants a particular rectangle to be positioned onto the screen.
`boolean`	`requestChildRectangleOnScreen( @NonNull RecyclerView parent, @NonNull View child, @NonNull Rect rect, boolean immediate, boolean focusedChildVisible )` Requests that the given child of the RecyclerView be positioned onto the screen.
`void`	`requestLayout()` Calls `RecyclerView#requestLayout` on the underlying RecyclerView
`void`	`requestSimpleAnimationsInNextLayout()` A LayoutManager can call this method to force RecyclerView to run simple animations in the next layout pass, even if there is not any trigger to do so.
`void`	`setAutoMeasureEnabled(boolean enabled)` This method is deprecated. Implementors of LayoutManager should define whether or not it uses AutoMeasure by overriding `isAutoMeasureEnabled`.
`final void`	`setItemPrefetchEnabled(boolean enabled)` Sets whether the LayoutManager should be queried for views outside of its viewport while the UI thread is idle between frames.
`void`	`setMeasuredDimension(int widthSize, int heightSize)` `Set the measured dimensions` of the host RecyclerView.
`void`	`setMeasuredDimension(Rect childrenBounds, int wSpec, int hSpec)` Sets the measured dimensions from the given bounding box of the children and the measurement specs that were passed into `onMeasure`.
`void`	`setMeasurementCacheEnabled(boolean measurementCacheEnabled)` Sets whether RecyclerView should use its own measurement cache for the children.
`void`	`startSmoothScroll(RecyclerView.SmoothScroller smoothScroller)` Starts a smooth scroll using the provided `SmoothScroller`.
`void`	`stopIgnoringView(@NonNull View view)` View can be scrapped and recycled again.

Constants

HORIZONTAL

Added in 1.0.0

public static final int HORIZONTAL = 0

INVALID_OFFSET

Added in 1.0.0

public static final int INVALID_OFFSET = -2147483648

VERTICAL

Added in 1.0.0

public static final int VERTICAL = 1

Public constructors

LinearLayoutManager

Added in 1.0.0

public LinearLayoutManager(Context context)

Creates a vertical LinearLayoutManager

Parameters
`Context context`	Current context, will be used to access resources.

LinearLayoutManager

Added in 1.0.0

public LinearLayoutManager(
    Context context,
    int orientation,
    boolean reverseLayout
)

Parameters
`Context context`	Current context, will be used to access resources.
`int orientation`	Layout orientation. Should be `HORIZONTAL` or `VERTICAL`.
`boolean reverseLayout`	When set to true, layouts from end to start.

LinearLayoutManager

Added in 1.0.0

public LinearLayoutManager(
    Context context,
    AttributeSet attrs,
    int defStyleAttr,
    int defStyleRes
)

Constructor used when layout manager is set in XML by RecyclerView attribute "layoutManager". Defaults to vertical orientation. orientationreverseLayoutstackFromEnd

Public methods

assertNotInLayoutOrScroll

public void assertNotInLayoutOrScroll(String message)

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

Parameters
`String message`	The message for the exception. Can be null.

See also
`assertInLayoutOrScroll`

canScrollHorizontally

public boolean canScrollHorizontally()

Returns
`boolean`	true if `getOrientation` is `HORIZONTAL`

canScrollVertically

public boolean canScrollVertically()

Returns
`boolean`	true if `getOrientation` is `VERTICAL`

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

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

If item prefetch is enabled, this method is called in between traversals to gather which positions the LayoutManager will soon need, given upcoming movement in subsequent traversals.

The LayoutManager should call addPosition for each item to be prepared, and these positions will have their ViewHolders created and bound, if there is sufficient time available, in advance of being needed by a scroll or layout.

Parameters
`int dx`	X movement component.
`int dy`	Y movement component.
`RecyclerView.State state`	State of RecyclerView
`RecyclerView.LayoutManager.LayoutPrefetchRegistry layoutPrefetchRegistry`	PrefetchRegistry to add prefetch entries into.

See also
`isItemPrefetchEnabled`
`collectInitialPrefetchPositions`

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

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

This method is only called when a RecyclerView is nested in another RecyclerView.

If item prefetch is enabled for this LayoutManager, as well in another containing LayoutManager, this method is called in between draw traversals to gather which positions this LayoutManager will first need, once it appears on the screen.

For example, if this LayoutManager represents a horizontally scrolling list within a vertically scrolling LayoutManager, this method would be called when the horizontal list is about to come onscreen.

Parameters
`int adapterItemCount`	number of items in the associated adapter.
`RecyclerView.LayoutManager.LayoutPrefetchRegistry layoutPrefetchRegistry`	PrefetchRegistry to add prefetch entries into.

See also
`isItemPrefetchEnabled`
`collectAdjacentPrefetchPositions`

public int computeHorizontalScrollExtent(RecyclerView.State state)

Override this method if you want to support scroll bars.

Read computeHorizontalScrollExtent for details.

Default implementation returns 0.

Parameters
`RecyclerView.State state`	Current state of RecyclerView

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

See also
`computeHorizontalScrollExtent`

public int computeHorizontalScrollOffset(RecyclerView.State state)

Override this method if you want to support scroll bars.

Read computeHorizontalScrollOffset for details.

Default implementation returns 0.

Parameters
`RecyclerView.State state`	Current State of RecyclerView where you can find total item count

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

See also
`computeHorizontalScrollOffset`

public int computeHorizontalScrollRange(RecyclerView.State state)

Override this method if you want to support scroll bars.

Read computeHorizontalScrollRange for details.

Default implementation returns 0.

Parameters
`RecyclerView.State state`	Current State of RecyclerView where you can find total item count

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

See also
`computeHorizontalScrollRange`

computeScrollVectorForPosition

Added in

LinearLayoutManager

Summary

Nested types

Constants

Public constructors

Public methods

Protected methods

Inherited methods

Constants

HORIZONTAL

INVALID_OFFSET

VERTICAL

Public constructors

LinearLayoutManager

LinearLayoutManager

LinearLayoutManager

Public methods

assertNotInLayoutOrScroll

canScrollHorizontally

canScrollVertically

collectAdjacentPrefetchPositions

collectInitialPrefetchPositions

computeHorizontalScrollExtent

computeHorizontalScrollOffset

computeHorizontalScrollRange

computeScrollVectorForPosition