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>();}@Overridepublic Object getChild(int groupPosition, int childPosition){return dataList.get(groupPosition).options.get(childPosition);}@Overridepublic long getChildId(int groupPosition, int childPosition){return childPosition;}@Overridepublic int getChildrenCount(int groupPosition){return dataList.get(groupPosition).options.size();}@Overridepublic 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;}@Overridepublic Object getGroup(int groupPosition){return dataList.get(groupPosition);}@Overridepublic int getGroupCount(){return dataList.size();}@Overridepublic long getGroupId(int groupPosition){return groupPosition;}@Overridepublic 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;}@Overridepublic boolean hasStableIds(){return true;}@Overridepublic 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IDif (recordOptions.containsKey(record.groupId)){// 取出此组IDRecordGroup 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。
