ExpandableListView二级列表

XMl

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

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

</RelativeLayout>

MainActivity

package com.bawei.d2;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private String[][] secondNames;
    private String[] names;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    ExpandableListView  elv=(ExpandableListView) findViewById(R.id.elv);
    
    names = new String[]{"     第一组","     第二组","     第三组","     第四组"};
    secondNames = new  String[][]{
            {"a","b","c"},
            {"d","e","f"},
            {"q","w","e","r"},
            {"s","d"}
    };
    
    elv.setAdapter(new BaseExpandableListAdapter() {
        
        @Override
        //控制二级列表条目是否可以点击
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return true;
        }
        
        @Override
        
        public boolean hasStableIds() {
            // TODO Auto-generated method stub
            return false;
        }
        
        @Override
         //返回一级列表的条目布局
        public View getGroupView(int groupPosition, boolean isExpanded,
                View convertView, ViewGroup parent) {
            View view=View.inflate(MainActivity.this,android.R.layout.simple_list_item_1,null);
            TextView textView= (TextView) view.findViewById(android.R.id.text1);
            textView.setText(names[groupPosition]);
            return view;
        }
        
        @Override
        //获取一级列表给定的Id
        public long getGroupId(int groupPosition) {
            // TODO Auto-generated method stub
            return groupPosition;
        }
        
        @Override
        //第一列表的个数
        public int getGroupCount() {
            // TODO Auto-generated method stub
            return names.length;
        }
        
        @Override
         //获取给定的一级列表的数据
        public Object getGroup(int groupPosition) {
            // TODO Auto-generated method stub
            return groupPosition;
        }
        
        @Override
        //第二级列表的个数
        public int getChildrenCount(int groupPosition) {
            // TODO Auto-generated method stub
            return secondNames[groupPosition].length;
        }
        
        @Override
         //返回二级列表的条目布局

        public View getChildView(int groupPosition, int childPosition,
                boolean isLastChild, View convertView, ViewGroup parent) {
            View view= View.inflate(MainActivity.this,android.R.layout.simple_list_item_1, null);
            TextView textView=(TextView) view.findViewById(android.R.id.text1);
            textView.setText(secondNames[groupPosition][childPosition]);
            return view;
        }
        
        @Override
         //获取二级列表给定的ID
        public long getChildId(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return childPosition;
        }
        
        @Override
        //获取给定的二级列表的数据
        public Object getChild(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return childPosition;
        }
    });
        //二级列表监听
    elv.setOnChildClickListener(new OnChildClickListener() {
        
        @Override
        public boolean onChildClick(ExpandableListView parent, View v,
                int groupPosition, int childPosition, long id) {
            Toast.makeText(MainActivity.this, "你点击了第"+(groupPosition+1)+"组的第"+(childPosition+1)+"项", 0).show();
            return false;
        }
    });
    
    
        

    }

    
}