listview默认选择第一项，点击换子项背景图

(不是大神，没有几百子项目，去你丫的)

private int last_item_position ;

    @Override
    public void onItemClick(AdapterView<?> arg0, View view, int position,
            long arg3) {

        // 取消合成
        mTts.stopSpeaking();
        isSpeaking = 0;

        PoiList poiList = poiListList.get(position);
        List<String> lStrings = poiList.poiContent;
        search_word_title.setText(poiList.poiName);
        tv_place.setText(poiList.poiSpotName);
        String contentUri = lStrings.get(0);
        downLoadContent(contentUri);

        ImageView imageView = (ImageView) view
                .findViewById(R.id.search_listview_item_img);

        last_item_position = position;
        adapter.notifyDataSetChanged();
    }

    public class SearchAdapter extends
            ArrayAdapter<GetResultFromPOIName.PoiList> {
        private int resourceId;
        private ImageView imageView;

        public SearchAdapter(Context context, int textViewResourceId,
                List<GetResultFromPOIName.PoiList> objects) {
            super(context, textViewResourceId, objects);
            resourceId = textViewResourceId;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            PoiList poiList = getItem(position);

            TextView newsTitleText = (TextView) convertView
                    .findViewById(R.id.news_title);
            imageView = (ImageView) convertView
                    .findViewById(R.id.search_listview_item_img);
            imageView.setBackgroundResource(R.drawable.image_floor_gary);
     if (last_item_position == position) {
imageView.setBackgroundResource(R.drawable.image_floor_color);
            } else {

                imageView.setBackgroundResource(R.drawable.image_floor_gary);
            }

            return convertView;
        }