ExpandableListView实现组内单选，组间多选功能

  有时候系统提供的组件并不能提供某些特定的功能,需要我们自己去实现,就比如最近项目中遇到的一个产品属性要实现同一组下的只能单选,而组间的要求可以是多选的,这时系统给我们提供的ExpandableListView就无法满足我们的需求了,需要我们自己去写一些业务逻辑去提供这个功能,下面是功能的效果图

这是未选择时的效果图，下面是选中时的效果图：

这样就实现了我们要的功能...

主要代码如下：

1.Adapter主要代码

        public class PropertySiftExpandListAdapter extends BaseExpandableListAdapter
{
    private Context context;
    private ArrayList dataList;
    private ViewHolder childHolder;
    private ViewHolder groupHolder;
    private Options child;
    private SearchProperty group;
    private GetPropertyListener propertyListener;
    public HashMap recordOptions; //哈希表来维护被选中的属性

    public PropertySiftExpandListAdapter(Context context, ArrayList dataList,
            GetPropertyListener propertyListener)
    {
        this.context = context;
        this.dataList = dataList;
        this.propertyListener = propertyListener;
        this.recordOptions = new HashMap();
    }

    @Override
    public Object getChild(int groupPosition, int childPosition)
    {
        return dataList.get(groupPosition).options.get(childPosition);
    }

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

    @Override
    public int getChildrenCount(int groupPosition)
    {
        return dataList.get(groupPosition).options.size();
    }


    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView,
            ViewGroup parent)
    {
        if (convertView == null)
        {
            convertView = LayoutInflater.from(context).inflate(R.layout.property_child_item, null);
            childHolder = new ViewHolder();
            childHolder.groupName = (TextView) convertView.findViewById(R.id.property_name);
            childHolder.checkBox = (CheckBox) convertView.findViewById(R.id.property_box);
            childHolder.propertyLayout = (RelativeLayout) convertView.findViewById(R.id.search_sift_property);
            convertView.setTag(childHolder);
        }
        else
        {
            childHolder = (ViewHolder) convertView.getTag();
        }
        childHolder.checkBox.setChecked(false);
        child = (Options) getChild(groupPosition, childPosition);
        childHolder.groupName.setText(child.name);
        childHolder.propertyLayout.setId(getID(groupPosition, childPosition).realId);
        childHolder.propertyLayout.setTag(R.id.property_one, child);
        childHolder.propertyLayout.setTag(R.id.property_two, getID(groupPosition, childPosition));
        //如果哈希表不为空
        if (recordOptions.size() != 0)
        {
            RecordGroup temp = recordOptions.get(groupPosition);
            if (temp != null)
            {
               //将表中存在的属性节点置为选中状态 
               if (temp.childId == childPosition)
                {
                    childHolder.checkBox.setChecked(true);
                }
            }
        }
        return convertView;
    }

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

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

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

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
    {
        group = (SearchProperty) getGroup(groupPosition);
        if (convertView == null)
        {
            convertView = LayoutInflater.from(context).inflate(R.layout.property_group_item, null);
            groupHolder = new ViewHolder();
            groupHolder.groupName = (TextView) convertView.findViewById(R.id.property_name);
            groupHolder.checkBox = (CheckBox) convertView.findViewById(R.id.property_box);
            convertView.setTag(groupHolder);
        }
        else
        {
            groupHolder = (ViewHolder) convertView.getTag();
        }

        if (group.choosen.equals("true"))
        {
            groupHolder.checkBox.setVisibility(View.VISIBLE);
        }
        else
        {
            groupHolder.checkBox.setVisibility(View.INVISIBLE);
        }
        groupHolder.groupName.setText(group.name);
        return convertView;
    }

    class ViewHolder
    {
        TextView groupName;
        CheckBox checkBox;
        RelativeLayout propertyLayout;
    }

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

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

    public RecordGroup getID(int groupPosition, int childPosition)
    {
        String id = String.valueOf(groupPosition) + String.valueOf(childPosition);
        return new RecordGroup(id, groupPosition, childPosition);
    }

    public interface GetPropertyListener
    {
        public void getPropertyData(int groupId, Options property);
    }

/**

*   此处根据点击的不同，利用HashMap将选中的数据保存起来，以便跟新为选中状态

*

    public void changeStyle(RecordGroup record, Options options)
    {
        // 判断是否已经存在此组ID
        if (recordOptions.containsKey(record.groupId))
        {
            // 取出此组ID
            RecordGroup tempRecord = recordOptions.get(record.groupId);
            if (tempRecord.childId != record.childId)
            {
                recordOptions.put(tempRecord.groupId, record);
                propertyListener.getPropertyData(tempRecord.groupId, options);
            }
            else
            {
                recordOptions.remove(record.groupId);
                propertyListener.getPropertyData(tempRecord.groupId, null);
            }
        }
        else
        {
            recordOptions.put(record.groupId, record);
            propertyListener.getPropertyData(record.groupId, options);
        }
        notifyDataSetChanged();
    }
}

自定义一个实体类，用来区分不同的选项。
public class RecordGroup
{
    public int realId;
    public int groupId;
    public int childId;

    public RecordGroup(String realId, int groupId, int childId)
    {
        this.realId = Integer.parseInt(realId);
        this.groupId = groupId;
        this.childId = childId;
    }
}
 
  
 
  
  Activity中的主要代码：private OnChildClickListener onChildListener = new OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) { changeDoneButton(); Options option = (Options) propertyExpandListAdapter.getChild(groupPosition, childPosition); //通知Adapter更新自己. 
  
 propertyExpandListAdapter .changeStyle(propertyExpandListAdapter.getID(groupPosition, childPosition), option); return true; } }; 
  
 
  
 
  
 
  
以上就是我们实现此功能的主要代码。
 
  
思路：
 
  
       将点击的不同选项用HashMap保存起来，存入Map时，先判断是否有相同的组ID，没有则直接添加，有则跟新为最新的组ID。存子项时，思路与存组时的思路是一致的。
 
  

 
  
第一次写博客，如有写的不好的地方请指出，代码有不懂的可以向我要源码，谢谢大家。