Make sure that items are visible

/*

 * Copyright (C) 2010 The Android Open Source Project

 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.

 *

 * Not a Contribution. Apache license notifications and license are retained

 * for attribution purposes only.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

        if (isShowing()) {

            if (mItemClickListener != null) {

                final DropDownListView list = mDropDownList;

                // Sometimes the perform item is not visible in ListView then

                // 'list.getChildAt' method will return null. So we should call

                // 'list.setSelectionInt' method to make sure the item is

                // visible.

                if (list.getLastVisiblePosition() < position) {

                    list.setSelectionInt(position);

                }

                final View child = list.getChildAt(position - list.getFirstVisiblePosition());

                final ListAdapter adapter = list.getAdapter();

                mItemClickListener.onItemClick(list, child, position, adapter.getItemId(position));