listview每个item上的每个button的点击事件都触发了，适配器每次都找了最后一个textview

SimpleAdapter wadapter=new SimpleAdapter(getActivity(), (List<? extends Map>) mapList,R.layout. simplist, new String[]{"name","status","scene"},new int[]{R.id. name,R.id. statustext,R.id. cenery}){
@Override
public View getView(int position, View convertView, ViewGroup parent) {

if(convertView==null{  
        convertView=super.getView(position,convertView,parent);                          holder.button = (Button) convertView.findViewById(R.id. button)            
        convertView.setTag(holder);
    }
    else {
 holder= (Viewholder) convertView.getTag();
    }
    buttonevent();//按钮点击事件
    return convertView;
}

};
我是在创建simpleadapter时在里面复写了getview方法
然后，无论点击哪一条item上的控件按钮，每次只有最后一个item会被监听