如何读取ExpandaListView的getChild [英] How to read the getChild in the ExpandaListView

问题描述

我在

的expandableListAdapter

 公共类ExpandableListAdapter扩展BaseExpandableListAdapter{
    私人上下文的背景下;
    私人列表＆LT;串GT; listdataheader;
    私人的HashMap＆LT;弦乐，产品＆GT; listdatachild;
    公共ExpandableListAdapter（上下文的背景下，ArrayList的＆LT;产品＆GT; FLIST）
    {
        HashMap的＆LT;弦乐，产品＆GT; listDataChild =新的HashMap＆LT;弦乐，产品＆GT;（）;
        对于（产品数据：FLIST）{
            listdatachild.put（data.Name，数据）;
        }        清单＆LT;串GT; listdataheader =新的ArrayList＆LT;串GT;（）;
        对于（产品数据：FLIST）{
            listdataheader.add（data.Name）;
        }        this.context =背景;
        this.listdataheader = listdataheader;
        this.listdatachild = listDataChild;
    }
 

我有在重写getChild，getChildrenCount方法的难度。
我有以下方法错误

  

无法解析方法来获取（'廉政'）
  无法解析的方法（'大小'）

  @覆盖
    公共对象getChild（INT groupPosition，诠释childPosition）{
        返回this.listdatachild.get（this.listdataheader.get（groupPosition））获得（childPosition）。
    }
 

和

  @覆盖
公众诠释getChildrenCount（INT groupPosition）{
    // TODO自动生成方法存根
    返回this.listdatachild.get（this.listdataheader.get（groupPosition））的大小（）。
}
 

解决方案

我觉得你搞砸了你的嵌套 GET 和尺寸，保持它的简单！

我会做这样的事情：

 公共类ExpandableListAdapter扩展BaseExpandableListAdapter {
    私人上下文的背景下;
    私人列表＆LT;串GT; listdataheader =新的ArrayList＆LT;串GT;（）;
    私人的HashMap＆LT;弦乐，产品＆GT; listdatachild =新的HashMap＆LT;弦乐，产品＆GT;（）;
    公共ExpandableListAdapter（上下文的背景下，ArrayList的＆LT;产品＆GT; FLIST）
    {
        对于（产品数据：FLIST）{
            listdatachild.put（data.Name，数据）;
        }        对于（产品数据：FLIST）{
            listdataheader.add（data.Name）;
        }        this.context =背景;
    }    @覆盖
    公共对象getChild（INT groupPosition，诠释childPosition）{
        返回listdatachild.get（this.listdataheader.get（groupPosition）;
    }    @覆盖
    公众诠释getChildrenCount（INT groupPosition）{
    返回listdatachild.size（）;
    }
}
 

I have an expandableListAdapter in

    public class ExpandableListAdapter extends BaseExpandableListAdapter

{
    private Context context;
    private List<String> listdataheader;
    private HashMap<String, Products> listdatachild;
    public ExpandableListAdapter(Context context,ArrayList<Products> fList)
    {
        HashMap<String, Products> listDataChild = new HashMap<String, Products>();
        for (Products data : fList) {
            listdatachild.put(data.Name, data);
        }

        List<String> listdataheader = new ArrayList<String>();
        for (Products data: fList) {
            listdataheader.add(data.Name);
        }

        this.context=context;
        this.listdataheader=listdataheader;
        this.listdatachild=listDataChild;
    }

I am having difficulty in rewriting the getChild, getChildrenCount methods. I am having the errors for the following methods

Cannot resolve method get('int') Cannot resolve method ('size')

 @Override
    public Object getChild(int groupPosition, int childPosition) {
        return this.listdatachild.get(this.listdataheader.get(groupPosition)).get(childPosition);
    }

and

@Override
public int getChildrenCount(int groupPosition) {
    // TODO Auto-generated method stub
    return this.listdatachild.get(this.listdataheader.get(groupPosition)).size();
}

解决方案

I think you messed up with your nested get and size, keep it simple!

I would have done something like this:

 public class ExpandableListAdapter extends BaseExpandableListAdapter{
    private Context context;
    private List<String> listdataheader = new ArrayList<String>();
    private HashMap<String, Products> listdatachild = new HashMap<String, Products>();
    public ExpandableListAdapter(Context context,ArrayList<Products> fList)
    {
        for (Products data : fList) {
            listdatachild.put(data.Name, data);
        }

        for (Products data: fList) {
            listdataheader.add(data.Name);
        }

        this.context=context;
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return listdatachild.get(this.listdataheader.get(groupPosition);
    }

    @Override
    public int getChildrenCount(int groupPosition) {
    return listdatachild.size();
    }
}

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