ExpandableListView实现列表收缩与展开

实现效果图：

    

（1）在xml文件里加入

<ExpandableListView
    android:childDivider="#E8E8E8"
    android:groupIndicator="@null"
    android:divider="#E8E8E8"
    android:dividerHeight="1dp"
    android:id="@+id/elv"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

（2）在activity_main里加

expandableListView = (ExpandableListView) findViewById(R.id.elv);
/* 1.1 创建一个adapter实例*/
MyExpandableListViewAdapter adapter = new MyExpandableListViewAdapter(getActivity());
/* 1. 设置适配器*/
expandableListView.setAdapter(adapter);

（3）新建MyExpandableListViewAdapter适配器

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;
/**
 * Created by lenovo on 2018/5/11.
 */
public class MyExpandableListViewAdapter extends BaseExpandableListAdapter {
    private Context context;
    /* 布局填充器*/
    private LayoutInflater inflater;
    private String[] group = new String[]{"最新代金券", "最新投票", "最新回答"};
    /* 构造,因为布局填充器填充布局需要使用到Context,通过构造来传递 */
    public MyExpandableListViewAdapter (Context context){
        this.context = context;
        inflater = LayoutInflater.from(context);
    }
    /*组数*/
    @Override
    public int getGroupCount() {
        return group.length;
    }
    /* 指定组的子Item数*/
    @Override
    public int getChildrenCount(int groupPosition) {
        if (groupPosition==0){
            return 0;
        }else if(groupPosition==1){
            return 1;
        }else {
            return 2;
        }
    }
    /*组数据*/
    @Override
    public Object getGroup(int groupPosition) {
        return group[groupPosition];
    }
    /*返回子选项的数据*/
    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return 0;

    }
    /*组ID*/
    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }
    /*子ID*/
    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }
    /*ID是否唯一*/
    @Override
    public boolean hasStableIds() {
        return true;
    }
    /* 组选项的视图处理 */
    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        /* 填充布局*/
        View view = inflater.inflate(R.layout.item_elv_group,null);
        ImageView iv_group_icon = (ImageView) view.findViewById(R.id.iv_group_icon);
        TextView tv_group_name = (TextView) view.findViewById(R.id.tv_group_name);
        tv_group_name.setText(group[groupPosition]);
        /*isExpanded 子列表是否展开*/
        if(isExpanded){
            iv_group_icon.setImageResource(R.mipmap.expan1);
        }else {
            iv_group_icon.setImageResource(R.mipmap.expan2);
        }
        return view;

    }
    /* 子选项的视图处理 */
    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        if(groupPosition==0){
            View viewc = inflater.inflate(R.layout.item_daijinquan,null);
            return  viewc;
        }else if(groupPosition==1){
            View viewa = inflater.inflate(R.layout.item_zuixinpiao,null);
            return viewa;
        }
        View viewb = inflater.inflate(R.layout.item_shequ,null);
        return viewb;
    }
    /*子选项是否可选 */
    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }
}

（4）新建item_elv_group.xml文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#ffffff">
    <View
        android:layout_width="match_parent"
        android:layout_height="8dp"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center_vertical">
        <ImageView
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:layout_marginLeft="10dp"
            android:src="@mipmap/address_default_bg" />
    <TextView
        android:text="我的好友"
        android:gravity="center"
        android:id="@+id/tv_group_name"
        android:layout_width="wrap_content"
        android:textColor="#1E90FF"
        android:layout_marginLeft="10dp"
        android:layout_height="wrap_content"
        />
<View
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="3"/>
    <ImageView
        android:padding="5dp"
        android:src="@mipmap/expan2"
        android:id="@+id/iv_group_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="10dp"
        />
    LinearLayout>
    <View
        android:layout_width="match_parent"
        android:layout_height="8dp"/>
LinearLayout>

（5）新建item_daijinquan.xml文件，里面可根据需求添加内容。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

LinearLayout>

（6）新建item_zuixinpiao.xml文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:id="@+id/ll_toupiao"
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:orientation="horizontal">
        <LinearLayout
            android:layout_width="0dp"
            android:layout_weight="1.1"
            android:layout_height="match_parent"
            android:orientation="horizontal">
            <ImageView
                android:layout_width="60dp"
                android:layout_height="60dp"
                android:src="@mipmap/course_process_start"
                android:layout_marginTop="5dp"
                android:layout_marginLeft="10dp"/>
        LinearLayout>
        <TextView
            android:layout_width="0dp"
            android:layout_weight="2"
            android:layout_height="wrap_content"
            android:textColor="#000"
            android:textSize="15sp"
            android:text="你喜欢什么活动"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="5dp"/>
        <View
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"/>
        <LinearLayout
            android:layout_width="0dp"
            android:layout_weight="1.5"
            android:layout_height="match_parent"
            android:orientation="horizontal">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:textSize="15sp"
                android:text="06-12 13:11"/>
        LinearLayout>
    LinearLayout>

LinearLayout>

（7）新建item_shequ,xml文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <View
        android:layout_width="match_parent"
        android:layout_height="10dp"/>
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    >
    <ImageView
        android:layout_width="0dp"
        android:layout_weight="0.8"
        android:layout_height="50dp"
        android:layout_marginLeft="10dp"
        android:src="@mipmap/uc_defheaderimg"/>
    <LinearLayout
        android:layout_width="0dp"
        android:layout_weight="3"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_marginLeft="10dp">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="184****3283"
            android:textColor="#000"
            android:textSize="15sp"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:text="2018-04-25   09:30"
            android:textSize="15sp"/>
    LinearLayout>
    <ImageView
        android:layout_width="0dp"
        android:layout_weight="0.3"
        android:layout_height="15dp"
        android:src="@mipmap/revert"
        android:layout_gravity="center"
        android:layout_marginBottom="5dp"
        />
    <TextView
        android:layout_width="0dp"
        android:layout_weight="0.5"
        android:layout_height="wrap_content"
        android:text="0"
        android:layout_gravity="center"
        android:layout_marginBottom="5dp"/>
LinearLayout>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:text="老师您好！我儿子今年上幼大班，可以开始为入学做些准备了吗？"
        android:textSize="15sp"
        android:textColor="#000"/>
    <View
        android:layout_width="match_parent"
        android:layout_height="10dp"/>
LinearLayout>