ExpandableListView控件实现二级列表

效果图如下:

二级列表附有点击事件。

 

1、布局文件:

此处加了一个自定义的导航RelativeLayout,记得注activity的时候添加 android:theme="@style/Theme.AppCompat.Light.NoActionBar" 去掉自带的导航。

 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="安卓二级列表"
28             android:textColor="@color/white"
29             android:textSize="@dimen/dimen_18"/>
30     </RelativeLayout>
31 
32     <!--二级菜单-->
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、一级列表布局:

ImageView是用来自定义打开闭合图标的(不自定义也可以,箭头会默认在最左边),建议自己用一个ImageView控件来控制上下箭头。图标可以去阿里巴巴矢量图上下载。
<?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">
<!--一级列表 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、二级列表布局:

<?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">
<!--二级列表 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代码:

 1     private ExpandableListView expandableListView;
 2 
 3     //一级列表数据源
 4     private String[] groups = {"软件设计", "数据库技术", "操作系统"};
 5     //二级列表数据源
 6     private String[][] childs={{"架构设计","面向对象","设计模式","领域驱动设计"},{"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 去掉自带箭头,在一级列表中动态添加
19         expandableListView.setGroupIndicator(null);
20         expandableListView.setAdapter(new MyExpandableListView());
21             
22     }
23     public void goBack(View view) {
24         finish();
25     }

5、ExpandableListView适配器:

继承自BaseExpandableListAdapter,重写ExpandableListAdapter中的10个方法
 1 class MyExpandableListView extends BaseExpandableListAdapter {
 2 
 3         /*一级列表个数*/
 4         @Override
 5         public int getGroupCount() {
 6             return groups.length;
 7         }
 8 
 9         /*每个二级列表的个数*/
10         @Override
11         public int getChildrenCount(int groupPosition) {
12             return childs[groupPosition].length;
13         }
14 
15         /*一级列表中单个item*/
16         @Override
17         public Object getGroup(int groupPosition) {
18             return groups[groupPosition];
19         }
20 
21         /*二级列表中单个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         /*每个item的id是否固定,一般为true*/
38         @Override
39         public boolean hasStableIds() {
40             return true;
41         }
42 
43         /*#TODO 填充一级列表
44         * isExpanded 是否已经展开
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             //控制是否展开图标
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 填充二级列表*/
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         /*二级列表中每个能否被选中,如果有点击事件一定要设为true*/
76         @Override
77         public boolean isChildSelectable(int groupPosition, int childPosition) {
78             return true;
79         }
80 
81 
82     }

到这里基本就完成了,最后再配置一下每个二级列表的点击事件即可:

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);//获得点击列表中TextView的值,需要强转一下,否则找不到getChildAt方法
5 Toast.makeText(ExpandableListViewActivity.this, "点击了 "+childAt.getText()+" 列表", Toast.LENGTH_SHORT).show();

6 return true;
7              } 
8 });

 

posted @ 2018-04-18 16:42  vetter  阅读(5777)  评论(0编辑  收藏  举报