BaseOnItemViewSelectedListener

interface BaseOnItemViewSelectedListener<T : Any!>
androidx.leanback.widget.BaseOnItemViewSelectedListener

Interface for receiving notification when a row or item becomes selected. The concept of current selection is different than focus. A row or item can be selected without having focus; for example, when a row header view gains focus then the corresponding row view becomes selected.

Summary

Public methods
abstract Unit
onItemSelected(itemViewHolder: Presenter.ViewHolder!, item: Any!, rowViewHolder: RowPresenter.ViewHolder!, row: T)

Called when a row or a new item becomes selected.

Public methods

onItemSelected

abstract fun onItemSelected(
    itemViewHolder: Presenter.ViewHolder!, 
    item: Any!, 
    rowViewHolder: RowPresenter.ViewHolder!, 
    row: T
): Unit

Called when a row or a new item becomes selected.

For a non ListRow case, parameter item may be null. Event is fired when selection changes between rows, regardless if row view has focus or not.

For a ListRow case, parameter item is null if the list row is empty.

In the case of a grid, the row parameter is always null.

  • Row has focus: event is fired when focus changes between children of the row.
  • No row has focus: the event is fired with the currently selected row and last focused item in the row.
    • Parameters
    itemViewHolder Presenter.ViewHolder!: The view holder of the item that is currently selected.
    item Any!: The item that is currently selected.
    rowViewHolder RowPresenter.ViewHolder!: The view holder of the row that is currently selected.
    row T: The row that is currently selected.