VerticalGridView focus control problem (VerticalGridView remote control direction key cannot jump to the last row when pointing down)

VerticalGridView AndroidTv focus control
problem:When there is no item below the penultimate line, the focus does not switch when pressing KEYCODE_DPAD_DOWN.

Solve the problem:When there is no item below the penultimate line, when KEYCODE_DPAD_DOWN is pressed, the last item gets focus.

public class CustomVerticalGridView extends VerticalGridView {
    
    

    private int columns;
    private int itemCount;
    private View lastItem;

    /**
     * 倒数第二行下方没有item的时候，按KEYCODE_DPAD_DOWN时，最后一个item获取焦点
     */
    private OnChildViewHolderSelectedListener mListener = new OnChildViewHolderSelectedListener() {
    
    
        @Override
        public void onChildViewHolderSelected(RecyclerView parent, ViewHolder child, int position, int subposition) {
    
    
            super.onChildViewHolderSelected(parent, child, position, subposition);
            itemCount = getAdapter().getItemCount();
//            Log.d("CustomVerticalGridView", "position=" + position);
//            Log.d("CustomVerticalGridView", "itemCount=" + itemCount);
            if (position + columns >= itemCount && (position % columns) + 1 > itemCount % columns) {
    
    
                child.itemView.setOnKeyListener(new View.OnKeyListener() {
    
    
                    @Override
                    public boolean onKey(View v, int keyCode, KeyEvent event) {
    
    
                        if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN && event.getAction() == KeyEvent.ACTION_DOWN) {
    
    
                            lastItem = getLayoutManager().findViewByPosition(itemCount - 1);
//                            Log.d("CustomVerticalGridView", "lastItem=" + lastItem);
                            if (lastItem != null) {
    
    
                                lastItem.requestFocus();
                            }
                        }
                        return false;
                    }
                });
            }
        }
    };

    public CustomVerticalGridView(Context context) {
    
    
        super(context);
        setOnChildViewHolderSelectedListener(mListener);
    }

    public CustomVerticalGridView(Context context, AttributeSet attrs) {
    
    
        super(context, attrs);
        setOnChildViewHolderSelectedListener(mListener);
    }

    public CustomVerticalGridView(Context context, AttributeSet attrs, int defStyle) {
    
    
        super(context, attrs, defStyle);
        setOnChildViewHolderSelectedListener(mListener);
    }

    @Override
    public void setNumColumns(int numColumns) {
    
    
        super.setNumColumns(numColumns);
        columns = numColumns;
    }

}