Simple Expandable List Example

This example shows how to create Expandable list using simple default adapter.


1.) Create a new project by File-> New -> Android Project name it SimpleExpandableListExample.

2.) Run for output.


1.) Create a project named SimpleExpandableListExample and set the information as stated in the image.

Build Target: Android 2.3.3
Application Name: SimpleExpandableListExample
Package Name: com.example
Activity Name: SimpleExpandableListExampleActivity
Min SDK Version: 10

2.) Open file and write following code there:

package com.example;

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

import android.os.Bundle;
import android.widget.ExpandableListAdapter;
import android.widget.SimpleExpandableListAdapter;

public class SimpleExpandableListExampleActivity extends ExpandableListActivity {
    private static final String NAME = "NAME";
    private static final String IS_EVEN = "IS_EVEN";

    private ExpandableListAdapter mAdapter;

    public void onCreate(Bundle savedInstanceState) {

        List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();
        List<List<Map<String, String>>> childData = new ArrayList<List<Map<String, String>>>();
        for (int i = 0; i < 20; i++) {
            Map<String, String> curGroupMap = new HashMap<String, String>();
            curGroupMap.put(NAME, "Item " + i);
            curGroupMap.put(IS_EVEN, (i % 2 == 0) ? "This group is even" : "This group is odd");

            List<Map<String, String>> children = new ArrayList<Map<String, String>>();
            for (int j = 0; j < 5; j++) {
                Map<String, String> curChildMap = new HashMap<String, String>();
               // curChildMap.put(NAME, "Child " + j);
                curChildMap.put(IS_EVEN, (j % 2 == 0) ? "Hello " + j: "Good Morning "+ j);

        // Set up our adapter
        mAdapter = new SimpleExpandableListAdapter(
                new String[] { NAME, IS_EVEN },
                new int[] {, },
                new String[] { NAME, IS_EVEN },
                new int[] {, }


3.) Compile and build the project.

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Leave a Reply 7 comments

Jose - May 27, 2012 Reply


I need that my class extends also from Activity, in my View appears more data, no only an ExpandableListActivity. How could I do this?


ariel - September 22, 2012 Reply

Muchas gracias… de gran utilidad :)

Michael - October 25, 2012 Reply

I’ve read hundreds (if not thousands) of tutorials and examples while developing Android applications, but I never wrote any comment if anything helped me – yes I will change that about myself.

After realizing that this saved my damned day I just wanted to say: Thank you!

Sagar - November 7, 2012 Reply

Is it possible to open expandableList on a button click in a activity ? I did succeed but list is hidden and not shown completely. For example like drop down list.

-coffee- - May 26, 2013 Reply

Thanks a lot! One question: where will the strings “This group is even” and “This group is odd” go?

Gonzalo - August 7, 2013 Reply

At last, a simple example of an expandable list, it is difficult to find them.
Just a couple of things:
* You are using a simple_expandable_list_item_1 for the main list, which have just one TextView, but you use two text for each item of the main list; so, the second one(key=IS_EVEN), it is not used (This group is even/odd).
* Secondly, you use a simple_expandable_list_item_2 for the children, these are the lists that are inside the main list; but you just put of them inside the children the list, the other is simply commented (// curChildMap.put(NAME, “Child ” + j)). I suppose you just want to use one of them, and this is because it appear a blank line inside each child item.
Anyway, thank you for your example.

Shashi Kumar - September 24, 2013 Reply

Best tutorial I’ve ever come across.

Hats off to you. Thank you.

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