本文介绍了在 onCreateViewHolder 中获取 View 的位置的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在使用带有 ImageView 和 TextView 的单行布局的 RecyclerView.

I am using a RecyclerView with a single row layout with an ImageView and a TextView.

我想为视图而不是为单独的 ViewHolder 对象实现一个 OnClickListener.如何在 Adapter 中获取视图的位置?

I want to implement a OnClickListener for the View and not for seperate ViewHolder objects. How can i get the position of the view in the Adapter?

现在我正在删除点击评论,但我无法选择点击的视图.我在适当的行中添加了一个 TODO.

Right now i'm deleting comments on click, but i cannot select the clicked View. I added a TODO in the appropriate line.

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

    /** List of Comment objects */
    private List<Comment> mCommentList;

    /** Database with Comment objects */
    private CommentsDataSource mDataSource;

    /**
     * Construcutor for CommentAdapter
     *
     * @param commentList   List of Comment objects
     * @param dataSource    Database with Comment objects
     */
    public CommentAdapter(List<Comment> commentList, CommentsDataSource dataSource) {
        this.mCommentList = commentList;
        this.mDataSource = dataSource;
    }

    /**
     * Add Comment objects to RecyclerView
     *
     * @param position  The position where the Comment object is added
     * @param comment   Comment Object
     */
    public void add(int position, Comment comment) {
        mCommentList.add(position, comment);
        notifyItemInserted(position);
    }

    /**
     * Remove Comment objects from RecyclerView
     *
     * @param comment Comment Object
     */
    public void remove(Comment comment) {
        int position = mCommentList.indexOf(comment);
        // Avoid double tap remove
        if (position != -1) {
            mCommentList.remove(position);
            mDataSource.deleteComment(comment);
            notifyItemRemoved(position);
        }
    }

    @Override
    public ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
        final View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.single_line_row, parent, false);
        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO get position
                remove(mCommentList.get(getItemCount() - 1));
            }
        });
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        final Comment comment = mCommentList.get(position);
        holder.comment.setText(comment.getComment());
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder {

        /** ImageView icon */
        public ImageView icon;

        /** TextView comment */
        public TextView comment;

        /**
         * Constructor for ViewHolder
         *
         * @param itemView Layout for each row of RecyclerView
         */
        public ViewHolder(final View itemView) {
            super(itemView);
            icon = (ImageView) itemView.findViewById(R.id.icon);
            comment = (TextView) itemView.findViewById(R.id.comment);
        }
    }
}

推荐答案

不能在回调中使用 onBindViewHolderposition 参数.如果上面添加了新项目,RecyclerView 不会重新绑定您的项目,因此该位置过时.相反,RecyclerView 在 ViewHolder 上提供了一个 getAdapterPosition 方法.

You cannot use the position parameter of onBindViewHolder in a callback.If a new item is added above, RecyclerView will not rebind your item so the position is obsolete.Instead, RecyclerView provides a getAdapterPosition method on the ViewHolder.

@Override
public ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
    final View view = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.single_line_row, parent, false);
    final ViewHolder holder = new ViewHolder(view);
    view.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final int position = holder.getAdapterPosition();
            if (position != RecyclerView.NO_POSITION) {
                remove(mCommentList.get(position));
            }
        }
    });
    return holder;
}

我添加了 position != RecyclerView.NO_POSITION 检查,因为当项目被移除时,RecyclerView 将淡出视图,因此它仍可能被用户点击,但其适配器位置将返回 NO_POSITION.

I've added position != RecyclerView.NO_POSITION check because when item is removed, RecyclerView will fade out the View so it may still be clicked by the user but its adapter position will return NO_POSITION.

这篇关于在 onCreateViewHolder 中获取 View 的位置的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-21 09:53