Implementation of an Adapter to an ExpandableListView. Specific for 1-line group/child title.

SimpleExpandableListAdapter.java

import java.util.ArrayList;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class NaiveExpandableListAdapter extends BaseExpandableListAdapter {

	/*
	 * Implementation of an Adapter to an ExpandableListView. Specific for
	 * 1-line group/child title.
	 * 
	 */

	private Context context;
	private ArrayList<ArrayList<String>> children;
	private ArrayList<String> groups;

	private ChildHolder cHolder;
	private GroupHolder gHolder;

	public NaiveExpandableListAdapter(Context context,
			ArrayList<String> groups, ArrayList<ArrayList<String>> children) {
		this.context = context;
		this.children = children;
		this.groups = groups;
	}

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

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

	@Override
	public View getChildView(int groupPosition, int childPosition,
			boolean isLastChild, View convertView, ViewGroup parent) {
		View row = convertView;
		cHolder = null;
		if (row == null) {
			LayoutInflater inflater = (LayoutInflater) context
					.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
			row = inflater.inflate(CHILD_RESOURCE, null);
			cHolder = new ChildHolder();
			cHolder.title = (TextView) row.findViewById(CHILD_TEXTVIEW);
			row.setTag(cHolder);
		} else {
			cHolder = (ChildHolder) row.getTag();
		}
		cHolder.title.setText((String) getChild(groupPosition, childPosition));

		return row;
	}

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

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

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

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

	@Override
	public View getGroupView(int groupPosition, boolean isExpanded,
			View convertView, ViewGroup parent) {
		View row = convertView;
		gHolder = null;
		if (row == null) {
			LayoutInflater inflater = (LayoutInflater) context
					.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
			row = inflater.inflate(PARENT_RESOURCE, null);
			gHolder = new GroupHolder();
			gHolder.title = (TextView) row.findViewById(PARENT_TEXTVIEW);
			row.setTag(gHolder);
		} else {
			gHolder = (GroupHolder) row.getTag();
		}
		gHolder.title.setText((String) getGroup(groupPosition));
		return row;
	}

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

	@Override
	public boolean isChildSelectable(int arg0, int arg1) {
		return true;
	}

}

class ChildHolder {
	TextView title;
}

class GroupHolder {
	TextView title;
}