1.以下为ExpandableListview的适配器，在我从网上找了很多之后，发现还是这个好用，并且最终在项目中用了这个（这个是放在Activity中的，没有单独的Adapter）。

    /**
 * ExpandableListview的适配器
 */
class MyAdapter extends BaseExpandableListAdapter {
    Context mcontext;

    public MyAdapter(Context context) {
        mcontext = context;
    }

    //得到子item需要关联的数据
    @Override
    public Object getChild(int groupPosition, int childPosition) {
        String key = parents.get(groupPosition);
        return (map.get(key).get(childPosition));
    }

    //得到子item的ID
    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    //设置子item的组件
    @Override
    public View getChildView(int groupPosition, int childPosition,
                             boolean isLastChild, View convertView, ViewGroup parent) {
        String key = ChoosePeiJianForExpireActivity.this.parents.get(groupPosition);
        String info = map.get(key).get(childPosition);

        ChildViewHolder holder = null;
        if (convertView == null) {
            convertView = LayoutInflater.from(mcontext)
                    .inflate(R.layout.item_tree_child, null);
            holder = new ChildViewHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (ChildViewHolder) convertView.getTag();
        }
        holder.tv_child.setText(info);
        return convertView;

    }

    //获取当前父item下的子item的个数
    @Override
    public int getChildrenCount(int groupPosition) {
        String key = parents.get(groupPosition);
        int size=map.get(key).size();
        return size;
    }
    //获取当前父item的数据
    @Override
    public Object getGroup(int groupPosition) {
        return parents.get(groupPosition);
    }

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

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }
    //设置父item组件
    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
                             View convertView, ViewGroup parent) {
        GroupViewHolder holder = null;
        if (convertView == null) {
            convertView = LayoutInflater.from(mcontext)
                    .inflate(R.layout.item_tree_group, null);
            holder = new GroupViewHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (GroupViewHolder) convertView.getTag();
        }
        holder.tv_group.setText(ChoosePeiJianForExpireActivity.this.parents.get(groupPosition));

        return convertView;
    }

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

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }


    /*绑定视图中的控件*/
    class GroupViewHolder {
        TextView  tv_group;
        ImageView iv_group_on,iv_group_down;

        GroupViewHolder(View view) {
            tv_group = (TextView) view.findViewById(R.id.tv_group);
            iv_group_on = (ImageView) view.findViewById(R.id.iv_group_on);
            iv_group_down = (ImageView) view.findViewById(R.id.iv_group_down);
        }
    }
    class ChildViewHolder {
        TextView tv_child;
        ImageView iv_child_choosenull,iv_child_chooseyes;

        ChildViewHolder(View view) {
            tv_child = (TextView) view.findViewById(R.id.tv_child);
            iv_child_choosenull = (ImageView) view.findViewById(R.id.iv_child_choosenull);
            iv_child_chooseyes = (ImageView) view.findViewById(R.id.iv_child_chooseyes);
        }
    }

}

2.在getChildView和getGroupView方法中找到自己自定义的布局，子布局和父布局必须进行视图绑定，并且在ViewHolder中得到自己需要的控件进行相应的处理。
如果没有以下步骤，就不会得到自己自定义的布局，而且父布局和子布局不能放在一起，要分开放。（惭愧啊，踩过这个坑）。

    class GroupViewHolder {
        TextView  tv_group;
        ImageView iv_group_on,iv_group_down;

        GroupViewHolder(View view) {
            tv_group = (TextView) view.findViewById(R.id.tv_group);
            iv_group_on = (ImageView) view.findViewById(R.id.iv_group_on);
            iv_group_down = (ImageView) view.findViewById(R.id.iv_group_down);
        }
    }
    class ChildViewHolder {
        TextView tv_child;
        ImageView iv_child_choosenull,iv_child_chooseyes;

        ChildViewHolder(View view) {
            tv_child = (TextView) view.findViewById(R.id.tv_child);
            iv_child_choosenull = (ImageView) view.findViewById(R.id.iv_child_choosenull);
            iv_child_chooseyes = (ImageView) view.findViewById(R.id.iv_child_chooseyes);
        }
    }