belongs to Maven artifact androidx.leanback:leanback:1.0.0-alpha1

OnChildViewHolderSelectedListener

public abstract class OnChildViewHolderSelectedListener
extends Object

java.lang.Object
   ↳ androidx.leanback.widget.OnChildViewHolderSelectedListener


Interface for receiving notification when a child of this ViewGroup has been selected. There are two methods:

  • {link onChildViewHolderSelected(RecyclerView, RecyclerView.ViewHolder, int, int)} is called when the view holder is about to be selected. The listener could change size of the view holder in this callback.
  • {link onChildViewHolderSelectedAndPositioned(RecyclerView, RecyclerView.ViewHolder, int, int) is called when view holder has been selected and laid out in RecyclerView.
  • Summary

    Public constructors

    OnChildViewHolderSelectedListener()

    Public methods

    void onChildViewHolderSelected(RecyclerView parent, RecyclerView.ViewHolder child, int position, int subposition)

    Callback method to be invoked when a child of this ViewGroup has been selected.

    void onChildViewHolderSelectedAndPositioned(RecyclerView parent, RecyclerView.ViewHolder child, int position, int subposition)

    Callback method to be invoked when a child of this ViewGroup has been selected and positioned.

    Inherited methods

    Public constructors

    OnChildViewHolderSelectedListener

    OnChildViewHolderSelectedListener ()

    Public methods

    onChildViewHolderSelected

    void onChildViewHolderSelected (RecyclerView parent, 
                    RecyclerView.ViewHolder child, 
                    int position, 
                    int subposition)

    Callback method to be invoked when a child of this ViewGroup has been selected. Listener might change the size of the child and the position of the child is not finalized. To get the final layout position of child, overide onChildViewHolderSelectedAndPositioned(RecyclerView, RecyclerView.ViewHolder, int, int).

    Parameters
    parent RecyclerView: The RecyclerView where the selection happened.

    child RecyclerView.ViewHolder: The ViewHolder within the RecyclerView that is selected, or null if no view is selected.

    position int: The position of the view in the adapter, or NO_POSITION if no view is selected.

    subposition int: The index of which ItemAlignmentFacet.ItemAlignmentDef being used, 0 if there is no ItemAlignmentDef defined for the item.

    onChildViewHolderSelectedAndPositioned

    void onChildViewHolderSelectedAndPositioned (RecyclerView parent, 
                    RecyclerView.ViewHolder child, 
                    int position, 
                    int subposition)

    Callback method to be invoked when a child of this ViewGroup has been selected and positioned.

    Parameters
    parent RecyclerView: The RecyclerView where the selection happened.

    child RecyclerView.ViewHolder: The ViewHolder within the RecyclerView that is selected, or null if no view is selected.

    position int: The position of the view in the adapter, or NO_POSITION if no view is selected.

    subposition int: The index of which ItemAlignmentFacet.ItemAlignmentDef being used, 0 if there is no ItemAlignmentDef defined for the item.