ListView只能显示一级列表，如果我们需要像QQ好友列表的那样的效果，就需要用到ExpandableListView，入门新手可能对该控件不是很熟悉，下面就详解一下基本用法，其实跟ListView差不多，下面来说一下具体的使用方法把！
效果图：
首先，布局中加入
<ExpandableListViewandroid:id ="@+id/expandableListView"android:layout_width ="fill_parent"android:layout_height ="wrap_content"android:groupIndicator="@null" />
然后，在activity中设置adapter，这里需要注意的是adapter的使用，我们这里的adapter继承的是BaseExpandableListAdapter
先初始一下数据，
public String[] groups = { "魏", "蜀", "吴" };public String[][] children = {{ "曹操", "荀彧", "郭嘉", "夏侯惇", "许褚"},{ "刘备", "诸葛亮", "关羽", "赵云", "庞统", "魏延", "马超" },{ "孙权", "周瑜", "鲁肃", "黄盖", "吕蒙"},};
然后设置adapter和点击监听
ExpandableListView expandableListView = (ExpandableListView)findViewById(R.id.expandableListView);expandableListView.setAdapter(new ExpandableAdapter(groups,children));//设置子条目的点击监听expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {@Overridepublic boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {Toast.makeText(MainActivity.this, "当前点击的是：："+groups[groupPosition]+"国的"+children[groupPosition][childPosition], Toast.LENGTH_SHORT).show();//这里return true的话子列表不会展开 return false才展开return false;}});
写一个自定义adapter继承BaseExpandableListAdapter
public class ExpandableAdapter extends BaseExpandableListAdapter{public String[] groups;public String[][] children;public ExpandableAdapter(String[] groups, String[][] children) {this.groups = groups;this.children = children;}//获取与给定的组相关的数据，得到数组groups中元素的数据public Object getGroup(int groupPosition) {return groups[groupPosition];}//获取与孩子在给定的组相关的数据,得到数组children中元素的数据public Object getChild(int groupPosition, int childPosition) {return children[groupPosition][childPosition];}//获取的群体数量，得到groups里元素的个数public int getGroupCount() {return groups.length;}//取得指定组中的children个数，就是groups中每一个条目中的个数public int getChildrenCount(int groupPosition) {return children[groupPosition].length;}//获取组在给定的位置编号，即groups中元素的IDpublic long getGroupId(int groupPosition) {return groupPosition;}//获取在给定的组的children的ID，也就是children中元素的IDpublic long getChildId(int groupPosition, int childPosition) {return childPosition;}//获取一个视图显示给定组，存放groupspublic View getGroupView(int groupPosition, boolean isExpanded, View convertView,ViewGroup parent) {TextView textView = getGenericView(24);textView.setText(getGroup(groupPosition).toString());return textView;}//获取一个视图显示在给定的组 的儿童的数据，就是存放childrenpublic View getChildView(int groupPosition, int childPosition, boolean isLastChild,View convertView, ViewGroup parent) {TextView textView = getGenericView(18);textView.setText(getChild(groupPosition, childPosition).toString());return textView;}//孩子在指定的位置是可选的，即：children中的元素是可点击的public boolean isChildSelectable(int groupPosition, int childPosition) {return true;}//表示孩子是否和组ID是跨基础数据的更改稳定public boolean hasStableIds() {return true;}//自定义的创建TextViewpublic TextView getGenericView(int mTextSize) {// Layout parameters for the ExpandableListViewAbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);TextView textView = new TextView(MainActivity.this);textView.setLayoutParams(lp);textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);textView.setPadding(42, 12, 12, 12);textView.setTextSize(mTextSize);textView.setTextColor(Color.BLACK);return textView;}}
OK！完成，运行一下看效果吧！想要美观一些需要在adapter的getChildView和getGroupView中加载自定义的布局文件，类似于BaseAdapter中的getView里的一样，如果条目过多的话注意别忘了在getChildView和getGroupView中使用ViewHolder！
好了，本次教程就这些，有什么错误的地方欢迎指点
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