效果圖如下：

二級列表附有點擊事件。

1、布局文件：

此處加了一個自定義的導航RelativeLayout，記得註activity的時候添加 android:theme="@style/Theme.AppCompat.Light.NoActionBar" 去掉自帶的導航。

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4
 
     android:layout_width="match_parent"
 5     android:layout_height="match_parent">
 6 
 7     <RelativeLayout
 8         android:layout_width="match_parent"
 9         android:layout_height="@dimen/dimen_55"
10         android:background="@color/main_title"
11         >
12         <TextView
 
13             android:layout_centerVertical="true"
14             android:layout_width="wrap_content"
15             android:layout_height="wrap_content"
16             android:text="取消"
17             android:textColor="@color/white"
18             android:textSize="@dimen/dimen_18"
19             android:layout_marginLeft="
 
@dimen/dimen_13"
20             android:onClick="goBack"
21             />
22         <TextView
23             android:layout_centerVertical="true"
24             android:layout_centerHorizontal="true"
25             android:layout_width="wrap_content"
26             android:layout_height="wrap_content"
27             android:text="安卓二級列表"
28             android:textColor="@color/white"
29             android:textSize="@dimen/dimen_18"/>
30     </RelativeLayout>
31 
32     <!--二級菜單-->
33     <ExpandableListView
34         android:id="@+id/expandableListView"
35         android:layout_width="match_parent"
36         android:layout_height="wrap_content">
37     </ExpandableListView>
38 
39 </LinearLayout>

2、一級列表布局：

ImageView是用來自定義打開閉合圖標的（不自定義也可以，箭頭會默認在最左邊），建議自己用一個ImageView控件來控制上下箭頭。圖標可以去阿裏巴巴矢量圖上下載。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="wrap_content">
<!--一級列表 item布局-->

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:id="@+id/tv_group"
            android:layout_width="wrap_content"
            android:layout_height="30dp"
            android:gravity="center"
            android:text="group text"
            />
        <ImageView
            android:id="@+id/iv_group"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:layout_marginRight="@dimen/dimen_20"
            android:layout_width="20dp"
            android:layout_height="20dp" />
    </RelativeLayout>
    
</LinearLayout>

3、二級列表布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center">
<!--二級列表 item布局-->

    <ImageView
        android:id="@+id/iv_child"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:src="@mipmap/ic_launcher" />
    <TextView
        android:id="@+id/tv_child"
        android:layout_marginLeft="@dimen/dimen_20"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="item text" />
    
</LinearLayout>

4、activity代碼：

 1     private ExpandableListView expandableListView;
 2 
 3     //一級列表數據源
 4     private String[] groups = {"軟件設計", "數據庫技術", "操作系統"};
 5     //二級列表數據源
 6     private String[][] childs={{"架構設計","面向對象","設計模式","領域驅動設計"},{"SQL Server","Oracle","MySql", "Dameng "},{"Linux","Windows","嵌入式"}};
 7 
 8 
 9     @Override
10     protected void onCreate(Bundle savedInstanceState) {
11         super.onCreate(savedInstanceState);
12         setContentView(R.layout.activity_expandable_listview);
13 
14         initView();
15     }
16     private void initView() {
17         expandableListView = (ExpandableListView)findViewById(R.id.expandableListView);
18         //#TODO 去掉自帶箭頭，在一級列表中動態添加
19         expandableListView.setGroupIndicator(null);
20         expandableListView.setAdapter(new MyExpandableListView());
21             
22     }
23     public void goBack(View view) {
24         finish();
25     }

5、ExpandableListView適配器：

繼承自BaseExpandableListAdapter，重寫ExpandableListAdapter中的10個方法

 1 class MyExpandableListView extends BaseExpandableListAdapter {
 2 
 3         /*一級列表個數*/
 4         @Override
 5         public int getGroupCount() {
 6             return groups.length;
 7         }
 8 
 9         /*每個二級列表的個數*/
10         @Override
11         public int getChildrenCount(int groupPosition) {
12             return childs[groupPosition].length;
13         }
14 
15         /*一級列表中單個item*/
16         @Override
17         public Object getGroup(int groupPosition) {
18             return groups[groupPosition];
19         }
20 
21         /*二級列表中單個item*/
22         @Override
23         public Object getChild(int groupPosition, int childPosition) {
24             return childs[groupPosition][childPosition];
25         }
26 
27         @Override
28         public long getGroupId(int groupPosition) {
29             return groupPosition;
30         }
31 
32         @Override
33         public long getChildId(int groupPosition, int childPosition) {
34             return childPosition;
35         }
36 
37         /*每個item的id是否固定，一般為true*/
38         @Override
39         public boolean hasStableIds() {
40             return true;
41         }
42 
43         /*#TODO 填充一級列表
44         * isExpanded 是否已經展開
45         * */
46         @Override
47         public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
48             if (convertView == null) {
49                 convertView = getLayoutInflater().inflate(R.layout.list_item_expandablelistview,null);
50             }
51             TextView tv_group = (TextView) convertView.findViewById(R.id.tv_group);
52             ImageView iv_group = (ImageView) convertView.findViewById(R.id.iv_group);
53             tv_group.setText(groups[groupPosition]);
54             //控制是否展開圖標
55             if (isExpanded) {
56                 iv_group.setImageResource(R.drawable.expand_iv_up);
57             } else {
58                 iv_group.setImageResource(R.drawable.expand_iv_down);
59             }
60             return convertView;
61         }
62 
63         /*#TODO 填充二級列表*/
64         @Override
65         public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
66             if (convertView == null) {
67                 convertView = getLayoutInflater().inflate(R.layout.list_item_expandablelistview_child,null);
68             }
69             ImageView image = (ImageView) convertView.findViewById(R.id.iv_child);
70             TextView tv = (TextView) convertView.findViewById(R.id.tv_child);
71             tv.setText(childs[groupPosition][childPosition]);
72             return convertView;
73         }
74 
75         /*二級列表中每個能否被選中，如果有點擊事件一定要設為true*/
76         @Override
77         public boolean isChildSelectable(int groupPosition, int childPosition) {
78             return true;
79         }
80 
81 
82     }

到這裏基本就完成了，最後再配置一下每個二級列表的點擊事件即可：

1 expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
2             @Override
3             public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
4                 TextView childAt = (TextView)((LinearLayout) v).getChildAt(1);//獲得點擊列表中TextView的值，需要強轉一下，否則找不到getChildAt方法
5                 Toast.makeText(ExpandableListViewActivity.this, "點擊了 "+childAt.getText()+" 列表", Toast.LENGTH_SHORT).show(); 

6                 return true; 

7              } 
8  });

ExpandableListView控件實現二級列表