看一下Adapter的完整程式碼。

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{
    // 展示資料
    private ArrayList<String> mData;
    // 事件回撥監聽
    private MyAdapter.OnItemClickListener onItemClickListener;
    public MyAdapter(ArrayList<String> data) {
        this.mData = data;
    }
    public void updateData(ArrayList<String> data) {
        this.mData = data;
        notifyDataSetChanged();
    }
    // 新增新的Item
    public void addNewItem() {
        if(mData == null) {
            mData = new ArrayList<>();
        }
        mData.add(0, "new Item");
        notifyItemInserted(0);
    }
    // 刪除Item
    public void deleteItem() {
        if(mData == null || mData.isEmpty()) {
            return;
        }
        mData.remove(0);
        notifyItemRemoved(0);
    }

    // ① 定義點選回撥介面
    public interface OnItemClickListener {
        void onItemClick(View view, int position);
        void onItemLongClick(View view, int position);
    }
    
    // ② 定義一個設定點選監聽器的方法
    public void setOnItemClickListener(MyAdapter.OnItemClickListener listener) {
        this.onItemClickListener = listener;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // 例項化展示的view
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.view_rv_item, parent, false);
        // 例項化viewholder
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, int position) {
        // 繫結資料
        holder.mTv.setText(mData.get(position));
        //③ 對RecyclerView的每一個itemView設定點選事件
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(final View v) {
                if(onItemClickListener != null) {
                    int pos = holder.getLayoutPosition();
                    onItemClickListener.onItemClick(holder.itemView, pos);
                }
            }
        });

        holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                if(onItemClickListener != null) {
                    int pos = holder.getLayoutPosition();
                    onItemClickListener.onItemLongClick(holder.itemView, pos);
                }
                //表示此事件已經消費，不會觸發單擊事件
                return true;
            }
        });
    }

    @Override
    public int getItemCount() {
        return mData == null ? 0 : mData.size();
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        TextView mTv;
        public ViewHolder(View itemView) {
            super(itemView);
            mTv = (TextView) itemView.findViewById(R.id.item_tv);
        }
    }
}
 

設定Adapter的事件監聽。

mAdapter.setOnItemClickListener(new MyAdapter.OnItemClickListener() {
    @Override
    public void onItemClick(View view, int position) {
        Toast.makeText(MDRvActivity.this,"click " + position + " item", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onItemLongClick(View view, int position) {
        Toast.makeText(MDRvActivity.this,"long click " + position + " item", Toast.LENGTH_SHORT).show();
    }
});