Android ExpandableListView

ExpandableListView 结合SimpleExpandableListAdapter用法

最终实现效果:

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.zy.expandablelistview.MainActivity">

    <ExpandableListView
        android:id="@+id/expand_list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </ExpandableListView>
</RelativeLayout>

父级布局文件group_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:gravity="center_vertical"

    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_group"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

子级布局文件child_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="30dp"
    android:paddingLeft="30dp"
    android:gravity="center_vertical"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_child"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

MainActivity.java

package com.zy.expandablelistview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

    List<Map<String,?>> groupList = new ArrayList<>();
    List<List<Map<String,String>>> itemList = new ArrayList<>();
    String[] groupStringArr = {"腾讯","百度","阿里巴巴"};
    String[][] itemStringArr = {
            {"QQ","腾讯云服务","QQ浏览器"},
            {"百度地图","百度搜索","百度外卖"},
            {"淘宝","天猫","阿里云"}
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ExpandableListView expandableListView = (ExpandableListView) findViewById(R.id.expand_list_view);

        //父级数组
        for (int i = 0; i < groupStringArr.length; i++) {
            Map<String,String> gMap = new HashMap<>();
            gMap.put("groupName",groupStringArr[i]);
            groupList.add(gMap);
            //子级数组
            List<Map<String,String>> itemFor = new ArrayList<>();
            for (int j = 0; j < itemStringArr[i].length; j++) {
                Map<String,String> iMap = new HashMap<>();
                iMap.put("itemName",itemStringArr[i][j]);
                itemFor.add(iMap);
            }
            itemList.add(itemFor);
        }

        SimpleExpandableListAdapter simpleExpandableListAdapter = new SimpleExpandableListAdapter(this,
                groupList,R.layout.group_item,new String[]{"groupName"},new int[]{R.id.tv_group},
                itemList,R.layout.child_item,new String[]{"itemName"},new int[]{R.id.tv_child});

        expandableListView.setAdapter(simpleExpandableListAdapter);
    }
}