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    <p>Try this,</p> <p><strong>main.xml</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="ExpandableListViewSample" /&gt; &lt;ExpandableListView android:id="@+id/ExpandableListView" android:layout_width="fill_parent" android:layout_height="0dip" android:layout_weight="1" &gt; &lt;/ExpandableListView&gt; &lt;/LinearLayout&gt; </code></pre> <p><strong>ExpList.java</strong></p> <pre><code>package com.example.android.photoalbum; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.ExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.ExpandableListView.OnChildClickListener; import android.widget.ExpandableListView.OnGroupClickListener; import android.widget.SimpleExpandableListAdapter; public class ExpList extends Activity { private static final String KEY1 = "GROUP"; private static final String KEY2 = "CHILD"; private String[] GROUPS = { "Group1", "Group2", "Group3" }; private String[][][] CHILDREN = { { { "Child11", "Text11" } }, { { "Child21", "Text21" }, { "Child22", "Text22" } }, { { "Child31", "Text31" }, { "Child32", "Text32" }, { "Child33", "Text33" } }, }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); List&lt;Map&lt;String, String&gt;&gt; groupData = new ArrayList&lt;Map&lt;String, String&gt;&gt;(); List&lt;List&lt;Map&lt;String, String&gt;&gt;&gt; childData = new ArrayList&lt;List&lt;Map&lt;String, String&gt;&gt;&gt;(); for (int i = 0; i &lt; GROUPS.length; i++) { Map&lt;String, String&gt; curGroupMap = new HashMap&lt;String, String&gt;(); groupData.add(curGroupMap); curGroupMap.put(KEY1, GROUPS[i]); curGroupMap.put(KEY2, ""); List&lt;Map&lt;String, String&gt;&gt; children = new ArrayList&lt;Map&lt;String, String&gt;&gt;(); if (CHILDREN.length &gt; i) { for (int j = 0; j &lt; CHILDREN[i].length; j++) { Map&lt;String, String&gt; curChildMap = new HashMap&lt;String, String&gt;(); children.add(curChildMap); curChildMap.put(KEY1, CHILDREN[i][j][0]); curChildMap.put(KEY2, CHILDREN[i][j][1]); } } childData.add(children); } ExpandableListAdapter adapter = new SimpleExpandableListAdapter(this, groupData, android.R.layout.simple_expandable_list_item_1, new String[] { KEY1, KEY2 }, new int[] { android.R.id.text1, android.R.id.text2 }, childData, android.R.layout.simple_expandable_list_item_2, new String[] { KEY1, KEY2 }, new int[] { android.R.id.text1, android.R.id.text2 }); ExpandableListView listView = (ExpandableListView) findViewById(R.id.ExpandableListView); listView.setAdapter(adapter); listView.setOnGroupClickListener(new OnGroupClickListener() { @Override public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) { return false; } }); listView.setOnChildClickListener(new OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) { return false; } }); } } </code></pre>
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    1. COThanks for the answer, I wanted to avoid using Hasmaps and only arrays, however I solved it by deleting the line " listlevel1 = (ExpandableListView) findViewById(R.id.listlevel1);" at the top of the ExpListActivity.java file
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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