给自己的备忘录——关于适配器

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;
}

@Override
public int getCount() {
// TODO Auto-generated method stub
    return list.size();
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
    return position;
}

@Override
public 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;
 　 }
}