Android development -- The magical use of setTag and The key must be an application-specific resource id exception

A tag is a property of a view, or it can be said that a map used by view to store parameters. It is useful for improving performance and parameter passing, such as improving the performance of a listview:

View for cache items

Copy the codeThe code is as follows:

public View getView(final int position, View convertView, ViewGroup parent) {
ItemViewHolder holder;

    if (convertView == null) {
        holder = new ItemViewHolder();
        convertView = (context).inflate(.view_item, null);
        = (TextView) (.text_item_content_time);
        = (TextView) (.text_item_content_remark);
        (holder);
    } else {
        holder = (ItemViewHolder)();
    }
           if(((position).getGroupId()).isShown()){
                (.child_show, true);
           }else{
               (.child_show, false);
           }

    return convertView;
}

Tags are used in the above code. If it is one, just setTag directly. What if there are multiple ones?

setTag also has an overload with int type, but setting a constant of final type or writing dead numbers will appear:

The key must be an application-specific resource id exception：

You need to define an ID in the file and then set it here! !

The above is the full content of the wonderful use of Android development setTag. I hope it can give you a reference and I hope you can support me more.