public class Adapter extends BaseAdapter {private Context context;private List<String> list;public Adapter(Context context,List<String> list){    this.context=context;    this.list=list;}@Overridepublic int getCount() {// TODO Auto-generated method stub    return list.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn list.get(position);}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stub    return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stub    viewholder holder=null;    if(convertView==null){        holder=new viewholder();        convertView=LayoutInflater.from(context).inflate(R.layout.activity_ main, null);        holder.textView=(TextView)   
        convertView.findViewById(R.id.text);        convertView.setTag(holder);    }else{        holder=(viewholder) convertView.getTag();    }    holder.textView.setText(getItem(position).toString());    return convertView;
}private class viewholder{　　　　private TextView textView; 　 }
}