Android TV Leanback RowsSupportFragment удалить строку

Question

Реализую расширение фрагмента.

Постановка проблемы: у меня есть список удаленных источников sourceкоторый содержит список списков, которые выбираются асинхронно при привязке строки списка. После возвращения списков некоторые из них пусты и их нужно удалить из пользовательского интерфейса: их нужно удалить из ListRowPresenter / ObjectAdapter, но я не могу определить, как полностью удалить строку списка без сбоя приложения. Исключение составляет следующее:

              at androidx.leanback.widget.ListRowPresenter.onBindRowViewHolder(ListRowPresenter.java:661)
        at androidx.leanback.widget.RowPresenter.onBindViewHolder(RowPresenter.java:601)
        at androidx.leanback.widget.Presenter.onBindViewHolder(Presenter.java:140)
        at androidx.leanback.widget.ItemBridgeAdapter.onBindViewHolder(ItemBridgeAdapter.java:422)
        at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7308)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6175)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6441)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6281)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6277)
        at androidx.leanback.widget.GridLayoutManager.getViewForPosition(GridLayoutManager.java:1102)
        at androidx.leanback.widget.GridLayoutManager$2.createItem(GridLayoutManager.java:1628)
        at androidx.leanback.widget.SingleRow.appendVisibleItems(SingleRow.java:113)
        at androidx.leanback.widget.Grid.appendOneColumnVisibleItems(Grid.java:389)
        at androidx.leanback.widget.GridLayoutManager.appendOneColumnVisibleItems(GridLayoutManager.java:1852)
        at androidx.leanback.widget.GridLayoutManager.onLayoutChildren(GridLayoutManager.java:2282)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4277)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3980)
        at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4546)
        at android.view.View.layout(View.java:20672)
        at android.view.ViewGroup.layout(ViewGroup.java:6194)
        at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1083)
        at android.view.View.layout(View.java:20672)
        at android.view.ViewGroup.layout(ViewGroup.java:6194)
        at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1855)
        at android.view.View.layout(View.java:20672)
        at android.view.ViewGroup.layout(ViewGroup.java:6194)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:20672)
        at android.view.ViewGroup.layout(ViewGroup.java:6194)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:20672)
        at android.view.ViewGroup.layout(ViewGroup.java:6194)
        at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1855)
        at android.view.View.layout(View.java:20672)
        at android.view.ViewGroup.layout(ViewGroup.java:6194)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.widget.ScrollView.onLayout(ScrollView.java:1552)
        at android.view.View.layout(View.java:20672)
        at android.view.ViewGroup.layout(ViewGroup.java:6194)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:20672)
        at android.view.ViewGroup.layout(ViewGroup.java:6194)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1565)
        at android.view.View.layout(View.java:20672)
        at android.view.ViewGroup.layout(ViewGroup.java:6194)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)

Вот что я пробовал:

вызов topLevelRowsAdapter.clear(indexOfRowToRemove) вылетает приложение.

вызов topLevelRowsAdapter[indexOfRowToRemove] = ListRow(ArrayObjectAdapter()) удаляет видимую строку, но оставляет ту, на которую может попасть курсор при прокрутке вверх и вниз.

Вот упрощенная версия того, что я пытаюсь сделать:

      class MyFragment : RowsSupportFragment() {
    private val listRowPresenter = ListRowPresenter(FocusHighlight.ZOOM_FACTOR_NONE)
    private val topLevelRowsAdapter = SparseArrayObjectAdapter(listRowPresenter)

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        topLevelRowsAdapter.setHasStableIds(true)
        source.forEachIndexed { index, listToGet ->
            val adapterForRow =
                ArrayObjectAdapter()
            // the list to get is bound to the UI, and the index corresponds to the ListRow that the list lives in -- this is passed so we can update
            adapterForRow.add(Pair(index, listToGet))
            topLevelRowsAdapter[newIndex] =
                ListRow(HeaderItem(listToGet.headerText), adapterForRow)
        }
    }

    this.adapter = topLevelRowsAdapter
}

    // After a row is bound and the network request comes back this is called. 
    override fun asyncCallback(listToGet: Pair<Int, CustomListObject>) {
        onTransitionPrepare()
        onTransitionStart()
        if (CustomListObject.listsForRow.isNotEmpty()) {
            // List from network is not empty, update the UI with the items that came back. This works!
            val updatingRow = (topLevelRowsAdapter[listToGet.first] as? ListRow)
            (updatingRow?.adapter as ArrayObjectAdapter).setItems(
                CustomListObject.listsForRow,
                diffUtil
            )
        } else {
            // The list came back empty and it needs to be removed from the UI 

            // This causes a crash
            topLevelRowsAdapter.clear(listToGet.first)
            // This works but there is a "blank" row that the cursor can land on
            topLevelRowsAdapter[listToGet.first] = ListRow(ArrayObjectAdapter())
        }

        onTransitionEnd()
    }
}

Я также попытался заменить строку пустым подклассом строки ListRow как показано ниже, но при прокрутке он все еще фокусируется:

      class EmptyRow : ListRow(HeaderItem(null), ArrayObjectAdapter()) {
    override fun isRenderedAsRowView(): Boolean {
        return false
    }
}

Я что-то упускаю или столкнулся с ограничением функции Leanback? RowsSupportFragment реализация?