LayoutParams

Kotlin |Java

open class LayoutParams : MarginLayoutParams

kotlin.Any
↳	android.view.ViewGroup.LayoutParams
	↳	android.view.ViewGroup.MarginLayoutParams
		↳	androidx.recyclerview.widget.RecyclerView.LayoutParams

Known Direct Subclasses

GridLayoutManager.LayoutParams, StaggeredGridLayoutManager.LayoutParams

GridLayoutManager.LayoutParams	LayoutParams used by GridLayoutManager.
StaggeredGridLayoutManager.LayoutParams	LayoutParams used by StaggeredGridLayoutManager.

LayoutParams subclass for children of RecyclerView. Custom layout managers are encouraged to create their own subclass of this LayoutParams class to store any additional required per-child view metadata about the layout.

Summary

Public constructors
`<init>(c: Context!, attrs: AttributeSet!)`
`<init>(width: Int, height: Int)`
`<init>(source: MarginLayoutParams!)`
`<init>(source: LayoutParams!)`
`<init>(source: RecyclerView.LayoutParams!)`

Public methods
open Int	`getAbsoluteAdapterPosition()` Returns the up-to-date adapter position that the view this LayoutParams is attached to corresponds to in the `RecyclerView`.
open Int	`getBindingAdapterPosition()` Returns the up-to-date adapter position that the view this LayoutParams is attached to corresponds to with respect to the `Adapter` that bound this View.
open Int	`getViewAdapterPosition()`
open Int	`getViewLayoutPosition()` Returns the adapter position that the view this LayoutParams is attached to corresponds to as of latest layout calculation.
open Int	`getViewPosition()`
open Boolean	`isItemChanged()` Returns true if the adapter data item corresponding to the view this LayoutParams is attached to has been changed in the data set.
open Boolean	`isItemRemoved()` Returns true if the adapter data item corresponding to the view this LayoutParams is attached to has been removed from the data set.
open Boolean	`isViewInvalid()` Returns true if the view this LayoutParams is attached to is now representing potentially invalid data.
open Boolean	`viewNeedsUpdate()` Returns true if the view this LayoutParams is attached to needs to have its content updated from the corresponding adapter.

Public constructors

<init>

LayoutParams(
    c: Context!, 
    attrs: AttributeSet!)

<init>

LayoutParams(
    width: Int, 
    height: Int)

<init>

LayoutParams(source: MarginLayoutParams!)

<init>

LayoutParams(source: LayoutParams!)

<init>

LayoutParams(source: RecyclerView.LayoutParams!)

Public methods

getAbsoluteAdapterPosition

open fun getAbsoluteAdapterPosition(): Int

Returns the up-to-date adapter position that the view this LayoutParams is attached to corresponds to in the RecyclerView. If the RecyclerView has an Adapter that merges other adapters, this position will be with respect to the adapter that is assigned to the RecyclerView.

Return
`Int`	the up-to-date adapter position this view with respect to the RecyclerView. It may return `RecyclerView#NO_POSITION` if item represented by this View has been removed or its up-to-date position cannot be calculated.

getBindingAdapterPosition

open fun getBindingAdapterPosition(): Int

Returns the up-to-date adapter position that the view this LayoutParams is attached to corresponds to with respect to the Adapter that bound this View.

Return
`Int`	the up-to-date adapter position this view relative to the `Adapter` that bound this View. It may return `RecyclerView#NO_POSITION` if item represented by this View has been removed or its up-to-date position cannot be calculated.

getViewAdapterPosition

open fun getViewAdapterPosition(): Int

Deprecated: This method is confusing when nested adapters are used. If you are calling from the context of an Adapter, use getBindingAdapterPosition(). If you need the position that RecyclerView sees, use getAbsoluteAdapterPosition().

getViewLayoutPosition

open fun getViewLayoutPosition(): Int

Returns the adapter position that the view this LayoutParams is attached to corresponds to as of latest layout calculation.

Return
`Int`	the adapter position this view as of latest layout pass

getViewPosition

open fun getViewPosition(): Int

Deprecated: use getViewLayoutPosition() or getViewAdapterPosition()

isItemChanged

open fun isItemChanged(): Boolean

Returns true if the adapter data item corresponding to the view this LayoutParams is attached to has been changed in the data set. A LayoutManager may choose to treat it differently in order to animate its changing state.

Return
`Boolean`	true if the item the view corresponds to was changed in the data set

isItemRemoved

open fun isItemRemoved(): Boolean

Returns true if the adapter data item corresponding to the view this LayoutParams is attached to has been removed from the data set. A LayoutManager may choose to treat it differently in order to animate its outgoing or disappearing state.

Return
`Boolean`	true if the item the view corresponds to was removed from the data set

isViewInvalid

open fun isViewInvalid(): Boolean

Returns true if the view this LayoutParams is attached to is now representing potentially invalid data. A LayoutManager should scrap/recycle it.

Return
`Boolean`	true if the view is invalid

viewNeedsUpdate

open fun viewNeedsUpdate(): Boolean

Returns true if the view this LayoutParams is attached to needs to have its content updated from the corresponding adapter.

Return
`Boolean`	true if the view should have its content updated