ItemTouchHelper notifyItemMoved从到位置不起作用

Question

目前,我在recyclerview中执行拖放项时遇到问题.我正在参考https://github.com/iPaulPro/Android-ItemTouchHelper-Demo 但是当在适配器中执行函数时:

mListBookMark是Object的ArrayList

@Override
public boolean onItemMove(int fromPosition, int toPosition) {
    Collections.swap(mListBookMark, fromPosition, toPosition);
    notifyItemMoved(fromPosition, toPosition);
    return true;
}

当我将项目从位置a拖动到位置b但是当完成拖动回收器视图时没有更改数据.我该怎么办？请给我一些建议!谢谢.

Answer 1

尝试添加notifyItemChanged()到您的代码,如下所示:

@Override
public boolean onItemMove(int fromPosition, int toPosition) {
    Collections.swap(mListBookMark, fromPosition, toPosition);
    notifyItemMoved(fromPosition, toPosition);
    notifyItemChanged(fromPosition);
    notifyItemChanged(toPosition);
    return true;
}

这应该根据新的位置更新视图.