expandableListView 含有子列表的列表控件（多级列表）

expandableListView通常用在继承ExpandableListActivity里面，直接调用getExpandableListView()获得expandableListView控件，若没有调用该函数反而会报错，可以参考：http://blog.csdn.net/cjjky/article/details/6903504

不过通常我们为了兼容多个版本而不继承ExpandableListActivity，用findViewById也可以，不过这都不重要，下面介绍个最简单的demo：其中xml文件里就只有一个ExpandableListView控件

一、简单的expandableListView用法

package com.example.user.spinnertest2;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;

import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity  {//ExpandableListActivity

    List<String> group;           //组列表
    List<List<String>> child;     //子列表
//    ContactsInfoAdapter adapter;  //数据适配器
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ExpandableListView expandableListView  = (ExpandableListView) findViewById(R.id.expent_listView1);
        initializeData();
        expandableListView.setAdapter(new MyExpandableAdaptor());


}

    class MyExpandableAdaptor extends BaseExpandableListAdapter{


        @Override
        public int getGroupCount() {
            return group.size();
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            return child.get(groupPosition).size();
        }

        @Override
        public Object getGroup(int groupPosition) {
            return group.get(groupPosition);
        }

        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return child.get(groupPosition).get(childPosition);
        }

        @Override
        public long getGroupId(int groupPosition) {
            return 0;
        }

        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return 0;
        }

        @Override
        public boolean hasStableIds() {
            return false;
        }

        @Override
        public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
            return getGenericView(group.get(groupPosition));
        }

        @Override
        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
            return getGenericView(child.get(groupPosition).get(childPosition));
        }


        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }


        //创建组/子视图
        public TextView getGenericView(String s) {
            // Layout parameters for the ExpandableListView
            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT, 80);

            TextView text = new TextView(MainActivity.this);
            text.setLayoutParams(lp);
            // Center the text vertically
            text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
            // Set the text starting position
            text.setPadding(100,0, 0, 0);
            text.setText(s);
            return text;
        }
    }


/**
 * 初始化组、子列表数据
 */
        private void initializeData(){
            group = new ArrayList<String>();
            child = new ArrayList<List<String>>();

            addInfo("Andy",new String[]{"male","138123***","GuangZhou"});
            addInfo("Fairy",new String[]{"female","138123***","GuangZhou"});
            addInfo("Jerry",new String[]{"male","138123***","ShenZhen"});
            addInfo("Tom",new String[]{"female","138123***","ShangHai"});
            addInfo("Bill",new String[]{"male","138231***","ZhanJiang"});

        }


    /**
     * 模拟给组、子列表添加数据
     * @param g-group
     * @param c-child
     */
    private void addInfo(String g,String[] c){
        group.add(g);
        List<String> childitem = new ArrayList<String>();
        for(int i=0;i<c.length;i++){
            childitem.add(c[i]);
        }
        child.add(childitem);
    }


}

　二、带图片的含自列表的列表用法：

 1、和ListView用法类似，也可以用HolderView记录控件免得重新加载，这里就不详细介绍了，demo中用的是未这样优化的简单方式。

2、利用layout.xml文件来显示group和child的视图。

Activity:

package com.example.user.spinnertest2;

import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;

import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity  {//ExpandableListActivity

    List<String> group;           //组列表
    List<List<String>> child;     //子列表
    HashMap<String ,Integer> hashmap ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ExpandableListView expandableListView  = (ExpandableListView) findViewById(R.id.expent_listView1);
        initializeData();
        hashmap = new HashMap();
        getDrawableIdByString();
        expandableListView.setAdapter(new MyExpandableAdaptor());


}

    class MyExpandableAdaptor extends BaseExpandableListAdapter{

        @Override
        public int getGroupCount() {
            return group.size();
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            return child.get(groupPosition).size();
        }

        @Override
        public Object getGroup(int groupPosition) {
            return group.get(groupPosition);
        }

        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return child.get(groupPosition).get(childPosition);
        }

        @Override
        public long getGroupId(int groupPosition) {
            return 0;
        }

        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return 0;
        }

        @Override
        public boolean hasStableIds() {
            return false;
        }

        @Override
        public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

            View view = getLayoutInflater().inflate(R.layout.group , null);

            ImageView imageView = (ImageView) view.findViewById(R.id.image_1);
            TextView  textView  = (TextView) view.findViewById(R.id.tv_1);
            String text = group.get(groupPosition);
            textView.setText(text);
            imageView.setImageResource(hashmap.get(text));

            return view;
        }

        @Override
        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
            View view = getLayoutInflater().inflate(R.layout.child , null);
            ImageView imageView = (ImageView) view.findViewById(R.id.image_2);
            TextView  textView  = (TextView) view.findViewById(R.id.tv_2);
            String text = child.get(groupPosition).get(childPosition);
            textView.setText(text);
            imageView.setImageResource(hashmap.get(text));
            return view;
        }


        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }



    }


/**
 * 初始化组、子列表数据
 */
        private void initializeData(){
            group = new ArrayList<String>();
            child = new ArrayList<List<String>>();

            addInfo("fruit",new String[]{"apple","banana"});
            addInfo("vegetables",new String[]{"eggplant","tomato"});
            addInfo("meats",new String[]{"pig","cow"});
        }


    /**
     * 模拟给组、子列表添加数据
     * @param g-group
     * @param c-child
     */
    private void addInfo(String g,String[] c){
        group.add(g);
        List<String> childitem = new ArrayList<String>();
        for(int i=0;i<c.length;i++){
            childitem.add(c[i]);
        }
        child.add(childitem);
    }

//将drawable图片的R的引用值存入hashMap中
    private void getDrawableIdByString()
    {
        hashmap.put("fruit" ,  R.drawable.fruite);
        hashmap.put("banana" ,  R.drawable.banana);
        hashmap.put("apple" ,  R.drawable.apple);
        hashmap.put("vegetables" ,  R.drawable.vegetables);
        hashmap.put("eggplant" ,  R.drawable.eggplant);
        hashmap.put("tomato" ,  R.drawable.tomato);
        hashmap.put("meats" ,  R.drawable.meats);
        hashmap.put("pig" ,  R.drawable.pig);
        hashmap.put("cow" ,  R.drawable.cow);
    }

}

　　gourp.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="match_parent"
    android:orientation="horizontal"
    >

   <ImageView
       android:layout_width="50dp"
       android:layout_height="50dp"
       android:id="@+id/image_1"
       android:background="@android:color/darker_gray"
       android:scaleType="centerCrop"
       />
    <TextView
        android:id="@+id/tv_1"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_marginLeft="30dp"
        android:text="水果"
        android:gravity="center_vertical"
        />

</LinearLayout>

　　child.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="match_parent">
    <ImageView
        android:layout_marginLeft="30dp"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:id="@+id/image_2"
        android:background="@android:color/darker_gray"
        android:scaleType="centerCrop"
        />
    <TextView
        android:id="@+id/tv_2"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_marginLeft="30dp"
        android:gravity="center_vertical"
        />

</LinearLayout>

　　效果图如下：