android_ExpandableListViewドロップダウンリストの使用

ExpandableListViewの使用をまとめます
ExpandableListViewとListViewの使い方の差は少なく、独自のアダプタもあり、自分のニーズに合わせてBaseExpandableListAdapterを継承し、自分でアダプタを書くことができます
先に効果図を載せる
ListViewとの用法差が少なく、項目から外したコード

   <span style="white-space:pre">		</span>inEditText = (EditText) findViewById(R.id.infusion_et_in);

		e_lv = (ExpandableListView) findViewById(R.id.infusion_elv);

		e_lv.setAdapter(new InfusionParentAdapter(getApplication()));

public class InfusionParentAdapter extends BaseExpandableListAdapter {

	private Context context;
	private String[] generalsTypes = new String[] { "  ", "  " };
	private String[][] generals = new String[][] { { "1", "2", "3" },
			{ "4", "5", "6" } };

	public InfusionParentAdapter() {
	}

	public InfusionParentAdapter(Context context) {
		this.context = context;
	}

	@Override
	public Object getChild(int groupPosition, int childPosition) {
		// TODO Auto-generated method stub
		return generals[groupPosition][childPosition];
	}

	@Override
	public long getChildId(int groupPosition, int childPosition) {
		// TODO Auto-generated method stub
		return childPosition;
	}

	@Override
	public View getChildView(int groupPosition, int childPosition,
			boolean isLastChild, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		convertView = LayoutInflater.from(context).inflate(
				R.layout.list_item_child, null);
		return convertView;
	}

	@Override
	public int getChildrenCount(int groupPosition) {
		// TODO Auto-generated method stub
		return generals[0].length;
	}

	@Override
	public Object getGroup(int groupPosition) {
		// TODO Auto-generated method stub
		return generalsTypes[groupPosition];
	}

	@Override
	public int getGroupCount() {
		// TODO Auto-generated method stub
		return generalsTypes.length;
	}

	@Override
	public long getGroupId(int groupPosition) {
		// TODO Auto-generated method stub
		return groupPosition;
	}

	@Override
	public View getGroupView(int groupPosition, boolean isExpanded,
			View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		convertView=LayoutInflater.from(context).inflate(R.layout.list_item_infusion_elistview, null);
		return convertView;
	}

	@Override
	public boolean hasStableIds() {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public boolean isChildSelectable(int groupPosition, int childPosition) {
		// TODO Auto-generated method stub
		return false;
	}

}

parentは拡張されたListViewを表し、Childはドロップダウンリストの内容を表し、残りはListViewの使い方と同じです