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<SearchProperty> dataList;    private ViewHolder childHolder;    private ViewHolder groupHolder;    private Options child;    private SearchProperty group;    private GetPropertyListener propertyListener;    public HashMap<Integer, RecordGroup> recordOptions; //哈希表来维护被选中的属性    public PropertySiftExpandListAdapter(Context context, ArrayList<SearchProperty> dataList,            GetPropertyListener propertyListener)    {        this.context = context;        this.dataList = dataList;        this.propertyListener = propertyListener;        this.recordOptions = new HashMap<Integer, RecordGroup>();    }    @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();    }}<pre name="code" class="java"><pre name="code" class="java">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。