Example of ExpendableList

package com.sajmon.ExpendableSample;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;
import android.widget.Toast;

public class ExpendableSampleActivity extends ExpandableListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        SimpleExpandableListAdapter expandAdapter = new SimpleExpandableListAdapter(this,
                groupData(), R.layout.group_view, new String[] {"Group Item"}, new int[] {R.id.group_label},
                childData(), R.layout.child_view, new String[] {"Sub Item"}, new int[] {R.id.child_label});
        setListAdapter(expandAdapter);
    }


    private List<HashMap<String, String>> groupData() {

        ArrayList<HashMap<String, String>> listData = new ArrayList<HashMap<String, String>>();
        for (int i = 0; i < 10; i++) {
            HashMap<String, String> hashData = new HashMap<String, String>();
            hashData.put("Group Item", "Group Item " + i);
            listData.add( hashData );
        }
        return listData;
    }

    private List<ArrayList<HashMap<String, String>>> childData() {

        ArrayList<ArrayList<HashMap<String, String>>> listData = new ArrayList<ArrayList<HashMap<String, String>>>();
        for (int i = 0; i < 10; i++) {
            ArrayList<HashMap<String, String>> childData = new ArrayList<HashMap<String, String>>();
            for (int n = 0; n < 3; n++) {
                HashMap<String, String> hashData = new HashMap<String, String>();
                hashData.put("Sub Item", "Sub Item " + n);
                childData.add( hashData );
            }
            listData.add( childData );
        }
        return listData;
    }

    @Override
    public void onGroupExpand(int groupPosition) {
        Toast.makeText(ExpendableSampleActivity.this, "Detected expand of Group " + groupPosition, Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onChildClick(ExpandableListView parent, View view, int groupPosition, int childPosition, long id) {

        Toast.makeText(getApplicationContext(),
                "You clicked on child item " + childPosition + " in Group " + groupPosition, Toast.LENGTH_SHORT).show();
        return super.onChildClick(parent, view, groupPosition, childPosition, id);
    }

}