android：使用BaseExpandableListAdapter实现可折叠的列表-白红宇

使用BaseExpandableListAdapter 可以实现所谓的可折叠的列表，例如QQ里好友的分组的功能。

BaseExpandableListAdapter与BaseAdapter的基本原理是一样的，只不过在传入list的时候，要传入两组，一组是groupArray ，一组时childArray，前者用于组名（类似QQ的好友、同学、朋友），后者的每个元素都是一组子数据（类似QQ同学中的张三，李四的集合），实现adapter

public class ExpandableAdapter extends BaseExpandableListAdapter{         private LinkedList
     
       groupArray;         private List
      
       
        > childArray;         private Context context;         private LayoutInflater inflater;                          public ExpandableAdapter(Context context,LinkedList
        
          courseGroupList,                    List
         
          
           > childArray){ inflater = ((Activity) context).getLayoutInflater(); this.groupArray = courseGroupList; this.childArray = childArray; } public int getGroupCount() { // TODO Auto-generated method stub return groupArray.size(); } public int getChildrenCount(int groupPosition) { // TODO Auto-generated method stub return childArray.get(groupPosition).size(); } public Object getGroup(int groupPosition) { // TODO Auto-generated method stub return groupArray.get(groupPosition); } public Object getChild(int groupPosition, int childPosition) { // TODO Auto-generated method stub return childArray.get(groupPosition).get(childPosition); } public long getGroupId(int groupPosition) { // TODO Auto-generated method stub return groupPosition; } public long getChildId(int groupPosition, int childPosition) { // TODO Auto-generated method stub return childPosition; } public boolean hasStableIds() { // TODO Auto-generated method stub return false; } public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { // TODO Auto-generated method stub TextView title; if(convertView == null){ convertView = inflater.inflate(R.layout.simple_listview_item, parent, false); } title = (TextView) convertView.findViewById(R.id.simple_listview_textview); String t = " "+groupArray.get(groupPosition).getname(); title.setText(t); return convertView; } public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { // TODO Auto-generated method stub TextView title; if(convertView == null){ convertView = inflater.inflate(R.layout.simple_listview_item, parent, false); } title = (TextView) convertView.findViewById(R.id.simple_listview_textview); String account = childArray.get(groupPosition).get(childPosition).getAccount(); String name = childArray.get(groupPosition).get(childPosition).getName(); String t = account +" "+name; Log.e("sumlist", "info is " +t); title.setText(t); return convertView; } public boolean isChildSelectable(int groupPosition, int childPosition) { // TODO Auto-generated method stub return true; } }

代码摘自现在的某个项目。

类似与BaseAdapter的关键getView方法，这里比较重要的是getGroupView和getChildView方法，其实内部实现都是类似的。

本文转自老Zhan博客园博客，原文链接：http://www.cnblogs.com/mybkn/archive/2012/06/18/2553637.html，如需转载请自行联系原作者