在Android中将notifyItemRemoved或notifyDataSetChanged与RecyclerView一起使用 [英] using notifyItemRemoved or notifyDataSetChanged with RecyclerView in Android

问题描述

我正在创建一个卡片列表以使用RecyclerView显示，其中每个卡片都有一个按钮，用于从列表中删除该卡片.

I am creating a list of cards to display using the RecyclerView, where each card has a button to remove that card from the list.

当我使用 notifyItemRemoved()在RecyclerView中删除卡片时，它将删除该项目并设置动画效果，但是列表中的数据未正确更新.

When i use notifyItemRemoved() to remove the card in the RecyclerView, it removes the item and animates fine but the data in the list is not updated correctly.

如果不是那样，我切换到 notifyDataSetChanged()，则列表中的项目将被删除并正确更新，但随后这些卡将不进行动画处理.

If instead of that, i switch to the notifyDataSetChanged() then the items in list are removed and updated correctly, but then the cards dont animate.

有人在使用notifyItemRemoved()方面有任何经验，并且知道为什么其行为与notifyDataSetChanged不同吗?

Does someone has any experience in using the notifyItemRemoved() and know why it behaves differently than notifyDataSetChanged?

这是我使用的一些代码:

Here is some peiece of code that i am using:

private List<DetectedIssue> issues = new ArrayList<DetectedIssue>();

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    // - get element from your dataset at this position
    // - replace the contents of the view with that element
    if(position >0){
        RiskViewHolder riskHolder = (RiskViewHolder)holder;
        final int index = position - 1;
        final DetectedIssue anIssue = issues.get(index);

        riskHolder.button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    int index = issues.indexOf(anIssue);
                    issues.remove(anIssue);
                    notifyItemRemoved(index);

                    //notifyDataSetChanged();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

@Override
public int getItemCount() {
    return (issues.size()+1);
}

推荐答案

正如@pskink所说，在我的情况下，使用notifyItemRemoved(index+1)应该是(index + 1)，可能是因为我保留了最高索引，即以获取标题.

As @pskink suggested it was supposed to be (index+1) in my case with notifyItemRemoved(index+1), probably because i am reserving the top index i.e. position=0 for a header.

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