http://blog.csdn.net/judy50/article/details/53334907 这篇文章的方法可以解决，但是是先展开点击的分组，再收之前的，打开新的分组后显示位置有问题，在这个基础上做了调整

        //设置分组项的点击监听事件
        expandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
            @Override
            public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
                for (int i = 0; i < expandableListviewAdapter.getGroupCount(); i++) {
                    if (groupPosition != i && expandableListView.isGroupExpanded(i)) {
                        //关闭已打开的分组
                        expandableListView.collapseGroup(i);
                    }
                }
                //切换点击的分组状态 打开/关闭
                if (expandableListView.isGroupExpanded(groupPosition)){
                    expandableListView.collapseGroup(groupPosition);
                }else {
                    expandableListView.expandGroup(groupPosition);
                }
                // true 拦截
                return true;
            }
        });