android三级列表显示不完整的问题

expandablelistview的子列表项也用expandablelistview组成三级列表，但是三级列表显示不完整，高度不能自动调整，将layout_height设置为固定的一值（足够大）的时候可以全部显示出来，不管是设置为wrap_content还是fill_parent都不能正常显示像是发高度已经固定死了一样的，下面是getChildView()的代码:
public View getChildView(int groupPosition, int childPosition,
                        boolean isLastChild, View convertView, ViewGroup parent)
        {  
                if(childPosition < notSubsection[groupPosition]){
                        View view = View.inflate(context, R.layout.childview, null);
                        TextView textView = (TextView)view.findViewById(R.id.childTextView);
                        textView.setText(getChild(groupPosition, childPosition).toString());
                        view.findViewById(R.id.childImageView2).setOnClickListener(new MyPictureOnClickListener(Intent.ACTION_CALL,Uri.parse("tel:"+telephone[groupPosition][childPosition])));
                        view.findViewById(R.id.childImageView3).setOnClickListener(new MyPictureOnClickListener(Intent.ACTION_SENDTO,Uri.parse("smsto:"+telephone[groupPosition][childPosition])));
                        view.findViewById(R.id.childImageView4).setOnClickListener(new MyPictureOnClickListener(Intent.ACTION_SENDTO,Uri.parse("mailto:"+email[groupPosition][childPosition])));
                        return view;
                }
                else{
                        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                                        ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);//设置宽度和高度
                        ExpandableListView expandableListView = new ExpandableListView(context);
                        SubsectionAdapter subsectionAdapter = new SubsectionAdapter(groupPosition,depSubsectionName[groupPosition].length, context);
                        expandableListView.setAdapter(subsectionAdapter);
                        expandableListView.setLayoutParams(lp);
                        return expandableListView;
}
求解？？？