在 RecyclerView 上获取对 ViewHolder 的引用单击 [英] Getting a Reference to ViewHolder on RecyclerView Click

问题描述

这是我第一次尝试实现 RecyclerView.我在 Adapter 和 ViewHolder 类之间实现了一个 Callback 接口来处理 UI 元素(按钮)上的点击事件.我在获取对发生单击的 ViewHolder 的引用时遇到问题.我可以单击列表中第一项的 Button，但是我要执行的操作在我的回收器视图中的最后一个 viewholder 上执行了定义.我终于想出了通过我的界面传递位置的方法，但我很难理解如何从中获取对该 viewholder` 的引用.

This is my first attempt at implementing the RecyclerView. I have implemented a Callback interface between the Adapter and the ViewHolder Class to handle Click Events on the UI elements (buttons). I am having problems getting a reference to the ViewHolder that the click occurred in. I can click the Button for the first item in the list, however the action that i'd defined is performed on the last viewholder in my recycler view. I finally figured out to pass the position through my interface, but I'm struggling to understand how to get a reference to that viewholder` from it.

    public class RoomAdapter extends RecyclerView.Adapter<RoomAdapter.RoomViewHolder>
{
    List<Room> mRooms;
    public RoomAdapter(List<Room> rooms) {
        mRooms = rooms;
    }

    @Override
    public RoomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        final View viewItem = LayoutInflater
                .from(viewGroup.getContext())
                .inflate(R.layout.room_rv_item,viewGroup,false);
        return vh = new RoomViewHolder(viewItem,new IRoomViewClick() {
            @Override
            public void editname(int pos) {

            }
        });
    }

    @Override
    public void onBindViewHolder(RoomViewHolder roomViewHolder, int i) {
        Room r = getItem(i);
        roomViewHolder.label.setText(r.name);


    }
    public Room getItem(int position)
    {
        return mRooms.get(position);
    }
    @Override
    public long getItemId(int position) {
        return mRooms.get(position).getId();
    }

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

    public static class RoomViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener
    {
        TextView label;
        Button editBtn;
        LinearLayout labelView;
        Button saveBtn;
        Button deleteBtn;
        EditText editNameET;
        IRoomViewClick mListener;
        public RoomViewHolder(View itemView, IRoomViewClick listener) {
            super(itemView);
            labelView = (LinearLayout) itemView.findViewById(R.id.labelview);
            mListener = listener;
            editBtn =(Button) itemView.findViewById(R.id.editbtn);
            editBtn.setOnClickListener(this);
            label = (TextView) itemView.findViewById(R.id.room_listitem_label);

        }

        @Override
        public void onClick(View view) {
            int pos = getPosition();
            mListener.editname(pos);



        }
    }
    public static interface IRoomViewClick
    {
        public void editname(int pos);
    }

}

推荐答案

你可以为onBindViewHolder中的editBtn设置标签:

you can set a tag for the editBtn in onBindViewHolder:

    public RoomViewHolder(View itemView, IRoomViewClick listener) {
        ....
        editBtn =(Button) itemView.findViewById(R.id.editbtn);
        //add tag for this view
        editBtn.setTag(this);
        ....
   }

并在 onClick

    @Override
    public void onClick(View view) {
        //getTag
        RoomViewHolder holder = (RoomViewHolder )(view.getTag());
        int pos = getPosition();
        mListener.editname(pos);
    ...
    }

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