java - RecyclerView onItemClickListener

Question

我正在寻求构建一个程序，让用户从文本列表中点击，这会将他们带到另一个 Activity 。

我知道 RecyclerView 没有点击监听器，就像 ListView 一样，但是经过几次尝试，我无法让它工作。

下面是我尝试实现的代码:

MyChatRecyclerViewAdapter.java

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

    private final List<Chat> mValues;
    private final OnItemClickListener listener;
    //private final OnListFragmentInteractionListener mListener;

    public MyChatRecyclerViewAdapter(List<Chat> items, OnItemClickListener listener) {
        this.mValues = items;
        //mListener = listener;
        this.listener = listener;
    }

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

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.mItem = mValues.get(position);
        holder.mIdView.setText(mValues.get(position).id);
        holder.bind(mValues.get(position), listener);
        holder.mContentView.setText(mValues.get(position).content);

        holder.mView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (null != listener) {
                    // Notify the active callbacks interface (the activity, if the
                    // fragment is attached to one) that an item has been selected.
                    listener.onListFragmentInteraction(holder.mItem);
                }
            }
        });
    }

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


    public interface OnItemClickListener {
        //public void onItemClick(View view , int position);
        void onItemClick(Chat item);
    }


    public class ViewHolder extends RecyclerView.ViewHolder{
        public final View mView;
        public final TextView mIdView;
        public final TextView mContentView;
        public Chat mItem;
        OnItemClickListener mItemClickListener;

        /*@Override
        public void onClick(View v) {
            if (mItemClickListener != null) {
                mItemClickListener.onItemClick(v, getPosition());
            }
        }*/

        public ViewHolder(View itemView) {
            super(itemView);
            mView = itemView;
            mIdView = (TextView) itemView.findViewById(R.id.id);
            mContentView = (TextView) itemView.findViewById(R.id.content);
        }

        public void bind(final Chat item, final OnItemClickListener listener){

            itemView.setOnClickListener(new View.OnClickListener(){
                @override
                public void onClick(View v){
                    listener.onItemClick(item);
                }
            });
        }

        @Override
        public String toString() {
            return super.toString() + " '" + mContentView.getText() + "'";
        }
    }
}

这是我尝试遵循的教程:https://antonioleiva.com/recyclerview-listener/

Answer 1

在 RecyclerView 中， View 被回收以提高性能。您不应将 OnClickListener 放在 onBindViewHolder 中，因为位置并不总是正确的。尝试在 ViewHolder 的构造函数中移动 OnClickListener 并通过调用 getAdapterPosition() 获取当前位置:

public ViewHolder(View itemView) {
        super(itemView);
        mView = itemView;
        mIdView = (TextView) itemView.findViewById(R.id.id);
        mContentView = (TextView) itemView.findViewById(R.id.content);

        mView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final int position = getAdapterPosition();
                if (null != listener) {     
                    listener.onListFragmentInteraction(mValues.get(position));
                }
           }
    });
}