android中的动态嵌套列表视图

Question

我的应用程序要求我显示动态嵌套列表视图.我的外部列表视图是一系列作业,并且每个作业都包含它所需的lineitems列表视图.我正在使用自定义适配器来实现动态嵌套列表视图.如下所示:

LineItemCustomListViewAdaptor - 加载单个作业的数据项

JobCustomListViewAdaptor - 通过在每个作业上调用LineItemCustomListViewAdaptor来加载各个作业.

我的JobCustomListViewAdaptor的getView函数是这样的 -

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

    LayoutInflater mInflater = (LayoutInflater) context
            .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.list_job, parent, false);
        holder = new ViewHolder();
        holder.jobnum = (TextView)convertView.findViewById(R.id.JobNum); // jobID
        holder.lineitems = (ListView)convertView.findViewById(R.id.list); // lineitems

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

    holder.jobnum.setText(job.getJobID());
    listviewadapter = new LineItemCustomListViewAdapter(context,R.layout.list_row, job.getLineItem());
    holder.lineitems.setAdapter(listviewadapter);   

    return convertView;
}

这样做工作正常,直到显示外部作业列表和内部列表.但是内部的每个作业仅显示第一个产品项,即外部列表的每一行仅显示内部列表的第一行.

任何人都可以指出我是否遗漏了什么或者我哪里出错了.任何帮助将不胜感激!

编辑:根据Barend的评论,使用ExpandableListAdapter使其工作.

由于ExpandableListView根据需要将每个元素添加为父/子组中的新行,因此列表的动态特性无关紧要.我将父及其关联的子数据存储在扩展适配器类中处理的ArrayList对象中.

public class ExpandableAdapter extends BaseExpandableListAdapter {

    private Context context;
    private ArrayList<String> parent;
    private ArrayList<ArrayList<LineItem>> children;

    public ExpandableAdapter(Context context, ArrayList<String> parent,
        ArrayList<ArrayList<LineItem>> children) {
         this.context = context;
         this.parent = parent;
         this.children = children;
    }

    @Override
    public View getChildView(final int groupPosition, final int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {

        final LineItem lineitem = (LineItem)getChild(groupPosition, childPosition);

        if (convertView == null) {
            LayoutInflater mInflater = (LayoutInflater) context
                .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
               convertView = mInflater.inflate(R.layout.list_row, null);
        }

        TextView item; // item
        TextView desc; // desc

        item = (TextView)convertView.findViewById(R.id.Item); // item
        desc = (TextView)convertView.findViewById(R.id.Desc); // desc

        item.setText(lineitem.getItem());
        desc.setText(lineitem.getDesc());
        return convertView;
    }


    public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {
    Integer parentnum = Integer.valueOf(groupPosition);

        String parentcond = (String) getGroup(groupPosition);
        TextView jobnum; // jobID
        TextView cond; 

        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_job,
                null);
        }    
        jobnum = (TextView)convertView.findViewById(R.id.JobNum); // jobID
        cond = (TextView)convertView.findViewById(R.id.Condition); // cond

        jobnum.setText(parentnum.toString())
        cond.setText(parentcond);
        return convertView;
   }

   /// other methods
} 

Answer 1

你不应该尝试嵌套两个列表视图 - 两者都是滚动视图,UX变得可怕.您应该使用的是use ExpandableListAdapter,它允许您创建父(组)和子视图的列表.每组可能有多个孩子,所以在实践中,你有嵌套列表,但实际上,它是单一的ListView.