如何在RecyclerView的末尾添加页脚？

// 自定义FooterView布局
public class FooterViewHolder extends RecyclerView.ViewHolder {
    public FooterViewHolder(View itemView) {
        super(itemView);
    }
}

// 在Adapter中添加标识位
private static final int TYPE_ITEM = 0;
private static final int TYPE_FOOTER = 1;
private boolean hasFooter = false;

// 重写getItemViewType方法
@Override
public int getItemViewType(int position) {
    if (position == getItemCount() - 1 && hasFooter) {
        return TYPE_FOOTER;
    }
    return TYPE_ITEM;
}

// 创建ViewHolder
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    if (viewType == TYPE_FOOTER) {
        View footerView = LayoutInflater.from(parent.getContext()).inflate(R.layout.footer_view, parent, false);
        return new FooterViewHolder(footerView);
    } else {
        // 创建普通项的ViewHolder
    }
}

// 绑定数据
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    if (holder instanceof FooterViewHolder) {
        // 绑定页脚数据
    } else {
        // 绑定普通项数据
    }
}

// 设置RecyclerView的LayoutManager和Adapter
RecyclerView recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);

// 添加ItemDecoration
recyclerView.addItemDecoration(new RecyclerView.ItemDecoration() {
    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        super.onDraw(c, parent, state);
        // 绘制页脚
    }
});

// 在需要显示页脚的时候，设置hasFooter为true，并调用Adapter的notifyDataSetChanged方法刷新数据
adapter.hasFooter = true;
adapter.notifyDataSetChanged();