Android：在 RecyclerView 上设置固定项目

Question

我有一个 RecyclerView，当我在第一个视图中单击时，它会添加另一个视图，就像图像中一样，我想要将 ID 为“1”的“添加”视图设置为固定在回收站，而不是第一个。

我的适配器：

public class AddEventsAdapter extends RecyclerView.Adapter<AddEventsAdapter.ViewHolder> {

   private List<String> items = new ArrayList<>();

    public void addItem(String name) {
        items.add(name);
        notifyItemInserted(items.size() - 1);
    }

    public void removeItem(int position) {
        items.remove(position);
        notifyItemRemoved(position);
        notifyItemRangeChanged(position, items.size());
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View view = inflater.inflate(R.layout.add_event_item, parent, false);

        return new ViewHolder(view);
    }


    @Override
    public int getItemCount() {
        return items.size();
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.setEventNameName(i + "");
        if(position == 0) 
        {
            holder.theLayout.setBackgroundColor(Color.parseColor("#7F9099"));
            holder.eventName.setText("Add");
        }

    }
    static int i;
    class ViewHolder extends RecyclerView.ViewHolder{

        public TextView eventName;
        public RelativeLayout theLayout;




        public ViewHolder(final View itemView) {
            super(itemView);
            eventName = (TextView)itemView.findViewById(R.id.eventName);
            theLayout = (RelativeLayout)itemView.findViewById(R.id.backgroundevent);

            theLayout.setId(++i);

            theLayout.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (getAdapterPosition()>0){
                        removeItem(getAdapterPosition());
                    }else {
                        addItem("");
                    }
                }
            });

        }

        public void setEventNameName(String TheEventName){
            eventName.setText(TheEventName);
        }
    }
}

在活动中：

final AddEventsAdapter AddContainer = new AddEventsAdapter();
    AddEventsRecycler.setLayoutManager(new LinearLayoutManager(this));
    AddEventsRecycler.setAdapter(AddContainer);
    AddEventsRecycler.setItemViewCacheSize(666);

    RecyclerView.ItemAnimator itemAnimator = new DefaultItemAnimator();
    itemAnimator.setAddDuration(1000);
    itemAnimator.setRemoveDuration(1000);
    AddEventsRecycler.setItemAnimator(itemAnimator);

    AddContainer.addItem("");

Answer 1

我通过创建一个允许页脚和页眉的自定义适配器解决了这个问题，这是 GitHub 中的项目：https://github.com/u3breeze/android-RecyclerView-WithHeaderAndFooter

Answer 2

您是否尝试过类似的方法：

 public void addItem(String name) {
        if (items.size() != 0) {
            removeItem(items.size() - 1);
            items.add(name);
            items.add("Add");
        } else
            items.add("Add");

        notifyItemInserted(items.size() - 1);
    }

那么添加项的id是items.size() -1

编辑： 使用以下代码更改您的 Holder 类中的 if：

     if(position == items.size() - 1) 
   {      
         holder.theLayout.setBackgroundColor(Color.parseColor("#7F9099"));
                    holder.eventName.setText("Add");
                }