1、 通常优化listview的adapter
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
final ReadInfo readinfo = mList.get(position);
if (convertView == null) {
convertView = inflater.inflate(R.layout.english_item, null);
holder = new ViewHolder();
holder.tv = (TextView) convertView.findViewById(R.id.tv);
holder.bt_stop = (Button) convertView.findViewById(R.id.stop);
holder.bt_play = (Button) convertView.findViewById(R.id.play);
holder.bt_record = (Button) convertView.findViewById(R.id.record);