GridView 末尾固定两个Item

今天做到一个添加讨论组成员，需要在最后面显示两个按钮，一个增加人，一个减少人，这样的话就需要在GridView最后面固定一个增加与删除按钮，说一个思路，思路就是在Adapter里面布局的时候，item后面放两个按钮，根据 position 来决定是不是要显示这个按钮，贴一下Adapter里面的代码

public class MeGroupDetailAdapter extends BaseAdapter {
    private Context context;
    private List<GroupDetailModel.Members> mList = new ArrayList<>();

    public MeGroupDetailAdapter(Context context, List<GroupDetailModel.Members> mList) {
        this.context = context;
        this.mList = mList;
    }

    @Override
    public int getCount() {
        return mList.size() + 2;
    }

    @Override
    public Object getItem(int i) {
        return mList.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        ViewHolder vh;
        if (view == null) {
            vh = new ViewHolder();
            view = View.inflate(context, R.layout.item_detail_avator, null);
            vh.mAddPic = (ImageView) view.findViewById(R.id.iv_detail_add);
            vh.mDelPic = (ImageView) view.findViewById(R.id.iv_detail_detele);
            vh.mPic = (ImageView) view.findViewById(R.id.iv_detail_photo);
            vh.mName = (TextView) view.findViewById(R.id.tv_detail_name);
            vh.mLLPerson = (LinearLayout) view.findViewById(R.id.ll_person);
            view.setTag(vh);
        } else {
            vh = (ViewHolder) view.getTag();
        }
        if (i < mList.size()) {
            vh.mAddPic.setVisibility(View.GONE);
            Glide.with(context).load(Constant.URL_PIC + mList.get(i).getAvator()).into(vh.mPic);
            vh.mName.setText(mList.get(i).getNickname());
        } else {
            if (i == mList.size()) {
                //添加按钮
                vh.mAddPic.setVisibility(View.VISIBLE);
                vh.mLLPerson.setVisibility(View.GONE);
                vh.mPic.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {

                    }
                });
            } else {
                //减少按钮
                vh.mDelPic.setVisibility(View.VISIBLE);
                vh.mLLPerson.setVisibility(View.GONE);
                vh.mPic.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {

                    }
                });
            }
        }
        return view;
    }

    private class ViewHolder {
        private TextView mName;
        private ImageView mPic, mAddPic, mDelPic;
        private LinearLayout mLLPerson;
    }
}