Android ViewHolder

public void setTag (Object tag)

Since: API Level 1

Sets the tag associated with this view. A tag can be used to mark a view in its hierarchy and does not have to be unique within the hierarchy. Tags can also be used to store data within a view without resorting to another data structure.

Parameters

an Object to tag the view with

also see

• getTag()
• setTag(int, Object)

• public View getView(int position, View convertView, ViewGroup parent) {
              final int cc = position;
              ViewHolder holder = null;
              if (convertView == null) {
                  holder = new ViewHolder();
                  convertView = mInflater.inflate(R.layout.itemrow, null);
                  holder.tagcolor = (ImageView) convertView.findViewById(R.id.itemrowiamge);
                  holder.itemname = (TextView) convertView.findViewById(R.id.itemrowtext);
                  holder.cb = (CheckBox) convertView.findViewById(R.id.itemrowcb);
                  convertView.setTag(holder);
              } else {
                  holder = (ViewHolder) convertView.getTag();
              }
   
              //获取ViewHolder中所填入的数据
              holder.tagcolor.setBackgroundResource((Integer) itemList.get(position).get("IMG"));
              holder.itemname.setText((String) itemList.get(position).get("ITEMNAME"));
              holder.ckd = (String) itemList.get(position).get("CHECKED");
   
              //单个项目中的CheckBox的按键监听函数
              holder.cb.setOnClickListener(new View.OnClickListener() {
                  public void onClick(View v) {
                      setC(cc);//当被按下后调用函数改变状态
                  }
              });
              if (holder.ckd.equals("t"))
                  holder.cb.setChecked(true);
              else
                  holder.cb.setChecked(false);
              return convertView;
          }

  
  ViewHolder class is static ,

• import android.widget.CheckBox;
  import android.widget.ImageView;
  import android.widget.TextView;
   
  //ViewHolder类用以储存每一条项目所需的数据
  public class ViewHolder {
      public ImageView tagcolor;//单条项目中的图片
      public TextView itemname;//单条项目中的文本
      public CheckBox cb;//单条项目中的CheckBox
      public String ckd;//单条项目中用以标识CheckBox状态的字符串变量
  }