Android ArrayAdapter 详解

public class UserListAdapter extends ArrayAdapter<User> {       private int resourceId;       public UserListAdapter(Context context, int textViewResourceId, List<User> objects) {           super(context, textViewResourceId, objects);           this.resourceId = textViewResourceId;       }              @Override       public View getView(int position, View convertView, ViewGroup parent){           User user = getItem(position);           LinearLayout userListItem = new LinearLayout(getContext());           String inflater = Context.LAYOUT_INFLATER_SERVICE;            LayoutInflater vi = (LayoutInflater)getContext().getSystemService(inflater);            vi.inflate(resourceId, userListItem, true);           TextView tvUsername = (TextView)userListItem.findViewById(R.id.tv_user_list_username);           TextView tvAskedNum = (TextView)userListItem.findViewById(R.id.tv_user_list_askednum);           TextView tvLastMsg = (TextView)userListItem.findViewById(R.id.tv_user_list_lastmsg);           tvUsername.setText(user.getUsername());           tvAskedNum.setText(String.valueOf(user.getAskedNum()));           tvLastMsg.setText(user.getLastMsg());           return userListItem;       }   }