RecyclerView.LayoutParams

public static class RecyclerView.LayoutParams
extends ViewGroup.MarginLayoutParams

java.lang.Object
   ↳ android.view.ViewGroup.LayoutParams
     ↳ android.view.ViewGroup.MarginLayoutParams
       ↳ androidx.recyclerview.widget.RecyclerView.LayoutParams


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

Inherited constants

Inherited fields

Public constructors

RecyclerView.LayoutParams(Context c, AttributeSet attrs)
RecyclerView.LayoutParams(int width, int height)
RecyclerView.LayoutParams(ViewGroup.MarginLayoutParams source)
RecyclerView.LayoutParams(ViewGroup.LayoutParams source)
RecyclerView.LayoutParams(RecyclerView.LayoutParams source)

Public methods

int getViewAdapterPosition()

Returns the up-to-date adapter position that the view this LayoutParams is attached to corresponds to.

int getViewLayoutPosition()

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

int getViewPosition()

This method is deprecated. use getViewLayoutPosition() or getViewAdapterPosition()

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.

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.

boolean isViewInvalid()

Returns true if the view this LayoutParams is attached to is now representing potentially invalid data.

boolean viewNeedsUpdate()

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

Inherited methods

Public constructors

RecyclerView.LayoutParams

public RecyclerView.LayoutParams (Context c, 
                AttributeSet attrs)

Parameters
c Context

attrs AttributeSet

RecyclerView.LayoutParams

public RecyclerView.LayoutParams (int width, 
                int height)

Parameters
width int

height int

RecyclerView.LayoutParams

public RecyclerView.LayoutParams (ViewGroup.MarginLayoutParams source)

Parameters
source ViewGroup.MarginLayoutParams

RecyclerView.LayoutParams

public RecyclerView.LayoutParams (ViewGroup.LayoutParams source)

Parameters
source ViewGroup.LayoutParams

RecyclerView.LayoutParams

public RecyclerView.LayoutParams (RecyclerView.LayoutParams source)

Parameters
source RecyclerView.LayoutParams

Public methods

getViewAdapterPosition

public int getViewAdapterPosition ()

Returns the up-to-date adapter position that the view this LayoutParams is attached to corresponds to.

Returns
int the up-to-date adapter position 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.

getViewLayoutPosition

public int getViewLayoutPosition ()

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

Returns
int the adapter position this view as of latest layout pass

getViewPosition

public int getViewPosition ()

This method is deprecated.
use getViewLayoutPosition() or getViewAdapterPosition()

Returns
int

isItemChanged

public 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. A LayoutManager may choose to treat it differently in order to animate its changing state.

Returns
boolean true if the item the view corresponds to was changed in the data set

isItemRemoved

public 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. A LayoutManager may choose to treat it differently in order to animate its outgoing or disappearing state.

Returns
boolean true if the item the view corresponds to was removed from the data set

isViewInvalid

public boolean isViewInvalid ()

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

Returns
boolean true if the view is invalid

viewNeedsUpdate

public boolean viewNeedsUpdate ()

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

Returns
boolean true if the view should have its content updated