android - 如何检索在 RecyclerView 适配器中单击的最后位置的 View ？

Question

我有一个用于歌曲列表的 RecyclerViewAdapter 类，当我触摸一首歌曲时，该歌曲的背景变为蓝色。问题是，如果我尝试触摸另一首歌曲，那首歌也会变成蓝色，但我找不到解决方案来更改列表中以前触摸的歌曲以更改 CardView 回来，这样只有每次触摸一个项目都会变成蓝色。

在 :

public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {


            final ViewHolder viewHolder = (ViewHolder) holder;

            viewHolder.setImageResourceType(mList, position);
            viewHolder.getTxtViewTitle().setText(mList.get(position).getTitle());
            viewHolder.getTxtViewArtist().setText(mList.get(position).getArtist());
            viewHolder.getTxtViewDuration().setText(MusicUtil.GetDurationHMS(mList.get(position).getDuration()));
            viewHolder.getCardView().setCardBackgroundColor(Color.argb(0, 0, 0, 0));


            viewHolder.getCardView().setOnClickListener(new View.OnClickListener()
            {
                @Override
                public void onClick(View view)
                {
                    mListener.onRecyclerViewItemClicked(viewHolder, position, view.getId());

                    viewHolder.getCardView().setCardBackgroundColor(Color.BLUE);

                    mLastPosition = position; // To be used to store last position clicked
                }
            });
}

Answer 1

在您的适配器类中管理一个 lastHolder 全局变量。

viewHolder.getCardView().setOnClickListener(new View.OnClickListener()
            {
                @Override
                public void onClick(View view)
                {
                    mListener.onRecyclerViewItemClicked(viewHolder, position, view.getId());

                    viewHolder.getCardView().setCardBackgroundColor(Color.BLUE);

                    mLastPosition = position; // To be used to store last position clicked
                    if(lastHolder!=null)
                     {
                        // do your task here which you want to do for previous selection


         lastHolder.getCardView().setCardBackgroundColor(Color.WHITE);
                     }
                     lastHolder=viewHolder;
                }
            });