滚动可扩展列表视图时 textview 值发生变化

Question

我有一个包含两个选项卡的活动，其中一个选项卡有一个带有可展开列表视图的片段。

选择选项卡时，正在调用后台操作并收集所有数据并将其设置为适当的数组。

我可以看到可展开的列表视图和相关的子视图，但是当我上下滚动时，我可以看到子文本视图的值发生了变化。

在 base_expandable_adapter 上，我正在与组和孩子的视图持有者合作。我无法弄清楚为什么价值观会发生变化。你有什么可以解决的吗？

public class S_GRP_EXP_LST_ADAPTER extends BaseExpandableListAdapter{

    private String TAG="EXP_LST_ADAPTER";
    private Context CNTX;
    private List<S_GRP_get_set>S_GRP_PARENT=new ArrayList<S_GRP_get_set>() ;
    private HashMap<String, List<S_GRP_get_set_child>> listDataChildResult = new HashMap<String, List<S_GRP_get_set_child>>();
    private ViewHolder holder=new ViewHolder();





    public S_GRP_EXP_LST_ADAPTER(List<S_GRP_get_set> _S_GRP_PARENT,HashMap<String, List<S_GRP_get_set_child>>  _listDataChildResult,Context _CNTX)
    {
        this.S_GRP_PARENT=_S_GRP_PARENT;
        this.listDataChildResult=_listDataChildResult;
        this.CNTX=_CNTX;

        Log.i(TAG, ""+S_GRP_PARENT.size() + ""+ listDataChildResult.size());
    }

    @Override
    public int getGroupCount() {
        Log.i(TAG, "getGroupCount() invoked");
        return S_GRP_PARENT.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        Log.i(TAG, "getChildrenCount() invoked");
        return listDataChildResult.get(S_GRP_PARENT.get(groupPosition).Get_Group_Name()).size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        Log.i(TAG, "getGroup() invoked");
        return S_GRP_PARENT.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        Log.i(TAG, "getChild() invoked");
        return listDataChildResult.get(S_GRP_PARENT.get(groupPosition).Get_Group_Name()).get(childPosition);
    }

    @Override
    public long getGroupId(int groupPosition) {
        Log.i(TAG, "getGroupId() invoked");
        return groupPosition;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        Log.i(TAG, "getChildId() invoked");
        return childPosition;
    }

    @Override
    public boolean hasStableIds() {
        Log.i(TAG, "hasStableIds() invoked");
        return false;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        Log.i(TAG, "getGroupView() invoked");

        View parentView =convertView;

        LayoutInflater inflater = (LayoutInflater)this.CNTX.getSystemService
                  (Context.LAYOUT_INFLATER_SERVICE);

        if(parentView==null)
        {

            parentView = inflater.inflate(R.layout.group_index_list_layout, parent, false);

            holder.grp_name=(TextView)parentView.findViewById(R.id.tv_Grp_Name);
            holder.grp_mtrc=(TextView)parentView.findViewById(R.id.tv_Grp_Mtrc);
            holder.grp_health=(TextView)parentView.findViewById(R.id.tv_Grp_Health_Title);
            parentView.setTag(holder);
        }

        else{
            holder = (ViewHolder) parentView.getTag();
        }

        holder.grp_name.setText(S_GRP_PARENT.get(groupPosition).Get_Group_Name());
        holder.grp_mtrc.setText(S_GRP_PARENT.get(groupPosition).Get_Group_mtrc());
        holder.grp_name.setText(S_GRP_PARENT.get(groupPosition).Get_Group_Name());

        return parentView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        Log.i(TAG, "getChildView() invoked");

        View childView=convertView;
        LayoutInflater inflaterchild = (LayoutInflater)this.CNTX.getSystemService
                  (Context.LAYOUT_INFLATER_SERVICE);

        if(childView==null)
        {

            childView = inflaterchild.inflate(R.layout.group_exp_list_child_layout, parent, false);

            child_holder.grp_r_index=(TextView)childView.findViewById(R.id.tv_r_S_name_in_GRP);
            child_holder.grp_r_state=(TextView)childView.findViewById(R.id.tv_R_SRV_state);
            childView.setTag(holder);
        }
        else
        {
            holder=(ViewHolder) childView.getTag();
        }

        child_holder.grp_r_index.setText(listDataChildResult.get(S_GRP_PARENT.get(groupPosition).Get_Grp_Name()).get(childPosition).get_srv_index());
        child_holder.grp_r_state.setText(listDataChildResult.get(S_GRP_PARENT.get(groupPosition).Get_Grp_Name()).get(childPosition).get_srv_state());

        return childView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

//class for the view holder
public class ViewHolder 

{
TextView grp_name;
TextView grp_mtrc;
TextView grp_health;
TextView grp_r_index;
TextView grp_r_state;
}


}

Answer 1

你好，我使用这个适配器来扩展列表视图 使用这个：

public class ExpandableListAdapter extends BaseExpandableListAdapter {

    private Context _context;
    private List<String> _listDataHeader; // header titles
    // child data in format of header title, child title
    private HashMap<String, List<String>> _listDataChild;
    private List<Home_property> data;
    int[] images_tag;

    public ExpandableListAdapter(Context context, List<Home_property> category,
            int[] image) {
        this._context = context;
        images_tag = image;
        data = category;

    }

    @Override
    public Object getChild(int groupPosition, int childPosititon) {
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .get(childPosititon);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

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

        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_item, null);
        }
        TextView txtListChild = (TextView) convertView
                .findViewById(R.id.lblListItem);
        txtListChild.setTypeface(Fontfamily.getFont(_context));
        txtListChild
                .setText(data.get(groupPosition).subcats.get(childPosition).subcatnam);
        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return data.get(groupPosition).subcats.size();

    }

    @Override
    public Object getGroup(int groupPosition) {
        return this._listDataHeader.get(groupPosition);
    }

    @Override
    public int getGroupCount() {
        return data.size();
    }

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_group, null);
        }
        TextView lblListHeader = (TextView) convertView
                .findViewById(R.id.lblListHeader);
        ImageView header = (ImageView) convertView.findViewById(R.id.header);
        lblListHeader.setTypeface(Fontfamily.getFont(_context));
        try {
            lblListHeader.setText(data.get(groupPosition).catnam);
        } catch (IndexOutOfBoundsException e) {

        }   

        header.setBackgroundResource(images_tag[groupPosition]);
        return convertView;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }
}