楼主有个地方错了,findViewById签名少了东西。
holder.apptitle = (TextView)convertView.findViewById(R.id.tv_item1);
holder.apptico = (TextView)convertView.findViewById(R.id.tv_item);
holder.apptitle = (TextView)convertView.findViewById(R.id.tv_item1);
holder.apptico = (TextView)convertView.findViewById(R.id.tv_item);
ViewHolder holder=null;
if(convertView==null){
holder=new ViewHolder();
convertView=inflater.inflate(R.layout.list,null);
holder.apptitle = (TextView)convertView.findViewById(R.id.tv_item1);
holder.apptico = (TextView)convertView.findViewById(R.id.tv_item);
convertView.setTag(holder);
}