Listview中第一个按钮无效，其他都正常

Question

public View getView(final int position, View convertView, ViewGroup parent) {

        final ViewHolder holder;
        ListViewListener LvListener = null;
        if (convertView == null) {

            holder=new ViewHolder();
            LvListener = new ListViewListener(position);

            convertView = mInflater.inflate(R.layout.location_list, null);
            convertView.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    Toast.makeText(LocationActivity.this, "您点击了：" + position,
                            Toast.LENGTH_SHORT).show();
                }
            });
            holder.userId = (TextView) convertView.findViewById(R.id.userId);
            holder.img = (ImageView)convertView.findViewById(R.id.img);
            holder.info = (TextView)convertView.findViewById(R.id.info);
            holder.distance = (TextView)convertView.findViewById(R.id.distance);
            holder.btnAdd = (Button)convertView.findViewById(R.id.btnAdd);
            convertView.setTag(holder);

        }else {
            holder = (ViewHolder)convertView.getTag();
        }

        try {
            holder.userId.setText(mData.get(position).get("userId").toString());
            holder.info.setText(mData.get(position).get("nickName").toString() + "  " 
                    + mData.get(position).get("sex").toString());
            holder.distance.setText((String)mData.get(position).get("distance") + "米");
            holder.btnAdd.setOnClickListener(LvListener);
            holder.img.setImageResource(R.drawable.a1);

        } catch (Exception e) {
            e.printStackTrace();
        }
        return convertView;
    }

Answer 1

 convertView.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    Toast.makeText(LocationActivity.this, "您点击了：" + position,  //position这个position和你的点击不对应。如果listview往下滚动，第一个item点击的时弹出的position是滚动屏幕内的position
                            Toast.LENGTH_SHORT).show();
                }
            });