ExpandableListView vList = (ExpandableListView) this.findViewById(R.id.list);
EListAdapter adapter = new EListAdapter(getApplicationContext(), list); //list 是数据源
vList.setAdapter(adapter);

//适配器就不写了, 都懂的
class EListAdapter extends BaseExpandableListAdapter {}

class EListAdapter extends BaseExpandableListAdapter {
  public EListAdapter(Context context, List<T> list) {
    this.list = list;
    this.context = context;
    handler = new Handler(){

      @Override
      public void handleMessage(Message msg) {
       notifyDataSetChanged();
       super.handleMessage(msg);
      }
    };
  }
  
  public void refresh() {
    handler.sendMessage(new Message());
  }
}

vList.collapseGroup(groupPosition);
vList.expandGroup(groupPosition);