Question

我有两个listview布局。（一个用于分隔符，另一个用于列表项）我为每个布局都有两个视图持有者类。如何在listview中正确使用这些不同的布局？

以下是我的getView()自定义适配器方法。

@Override
public View getView(int position, View convertView, ViewGroup parent){
    int pos = position;
    final Context context = parent.getContext();
    int viewType = this.getItemViewType(position);
    View view = convertView;

    switch(viewType){

        case TYPE_ITEM:
            HolderItem holder_item;

            if(view == null){
                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                view = inflater.inflate(R.layout.list_item, parent, false);

                holder_item = new HolderItem();
                holder_item.title = (TextView) view.findViewById(R.id.title);
                holder_item.subTitle = (TextView) view.findViewById(R.id.sub_title);
                view.setTag(holder_item);
            }else{
                holder_item = (HolderItem) view.getTag();
            }

            holder_item.title.setText(titleList.get(pos));
            holder_item.subTitle.setText(infoList.get(pos));
            return view;

        case TYPE_SEPARATOR:
            HolderSeparator holder_sep;

            if(view == null){
                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                view = inflater.inflate(R.layout.list_header, parent, false);

                holder_sep = new HolderSeparator();
                holder_sep.separator = (TextView) view.findViewById(R.id.list_header);
                view.setTag(holder_sep);
            }else{
                holder_sep = (HolderSeparator)view.getTag();
            }

            holder_sep.separator.setText(titleList.get(pos));
            return view;


        default:
            return view;
    }

}

public int getItemViewType(int position){
    if(position == 0 || position == 5) return TYPE_SEPARATOR;
    else return TYPE_ITEM;
}

class HolderItem{
    TextView title;
    TextView subTitle;
}
class HolderSeparator{
    TextView separator;
}

有两个分隔符（在listview的顶部和listview的中间）上面的代码工作正常，但是当我开始滚动时，它出现ClassCastException

java.lang.ClassCastException: com.soonoo.listtest.Adapter$Holder cannot be cast to com.soonoo.listtest.Adapter$HolderItem

我认为我的代码使用了两个视图持有者，当滚动时，新的列表项使用分隔符的视图持有者。我该如何解决？

Answer 1

如果您覆盖getItemViewType()，则还需要覆盖getViewTypeCount()，以指明您有多少种不同的行类型。

如何在Android listview中使用不同的行布局

1 个答案: