如何使用自定义适配器的setTag和getTag

Question

我被困了,我需要帮助.我正在尝试使用set并获取Tag但我无法了解它对此操作的工作原理:

• 我正在使用列表视图来显示加载到扩展适配器的图像
• 自定义适配器使用imageview_1,textview_1和button_1为布局充气
• 在我的主要活动中,我有一个用于button_1的"Public Void OnClickHandler",并且在布局上配置了"android:onClick",所以当点击按钮时它会做一些事情
• 单击button_1时,我想从该特定视图中获取textview_1中的文本,然后加载不同的图像.我想使用get和set TAGS来做到这一点,所以我需要使用button_1和imageview_1进行引用.这里是我的剪辑代码.先感谢您

自定义适配器

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder = null;

    LayoutInflater mInflater = (LayoutInflater) 
        context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);

    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.itemstartsession, null);
        holder = new ViewHolder();

        holder.image = (WebView)convertView.findViewById(R.id.img_session);
        //holder.image.setTag(position);

        holder.code = (TextView)convertView.findViewById(R.id.code_item_session_text);
        //holder.code.setTag(position);


        holder.share=(ImageButton)convertView.findViewById(R.id.share_item_session_button);
        holder.share.setTag(position);

        convertView.setTag(holder);
    // Check if my setTag is ok for button and get the reference to get 
        //text from textview and the referece to webview, then I gonna load a url
    } else {

        holder=(ViewHolder)convertView.getTag();
    }

    StoreDataForBA storeItem= (StoreDataForBA) getItem(position);
    holder.image.loadUrl(storeItem.getImage());

        holder.code.setText(storeItem.getCode());

return convertView;
}

这是我的数据的getter和setter,非常简单

public StoreDataForBA( String image, String code) {

    this.setImage(image);
    this.setCode(code);

}

public String getImage() {
    return image;
}

public void setImage(String image) {
    this.image = image;
}


public String getCode() {
    return code;
}

public void setCode(String code) {
    this.code = code;
}

我的主要活动剪断了

public void shareOnClickHandler(View v) {
// plz here i need the code to get the text from textview and also get the 
// reference of the webview, so i can do something like
// StoreDataForBA data = (StoreDataForBA)v.getTag();
// image2.loadUrl("http://image2")..... I'm not sure, thank you
}

Answer 1

你的代码有点混乱,所以我给你一个样本

示例Tag类

public class MyTag
{
   String  code;
   String  image;
   String  web_ref;

  public MyTag()
    {
     code=null;
     image=null;
     web_ref=null;
    }

    public MyTag(String cod,String img,String wref)
    {
      code=cod;
      image=img;
      web_ref=wref;
    }

}

你想在点击按钮时获得这个值吗？因此,将此标记类对象作为标记放在自定义适配器的getView中的按钮上

MyTag myTag=new MyTag("code","image","web_ref");
holder.button.setTag(myTag);

因为您将视图单击作为函数的参数

public void shareOnClickHandler(View v) 
{

   myTag=(MyTag)v.getTag();
   text=myTag.code;
   image2.loadUrl("http://"+myTag.image);//..... I'm not sure, thank you
   webview.loadUrl(mytag.web_ref);
}

我想你明白了,试着用这个想法来实现你的代码

Answer 2

您非常接近您的答案。只需跟随更改并完成答案

@Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder holder;

        if ((convertView == null) || (convertView.getTag() == null)) {
            LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = mInflater.inflate(R.layout.list_item, null);
            holder = new ViewHolder();
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        convertView.setTag(holder);

        return convertView;
    }