java - 删除笔记数组后如何重新加载笔记数组？

Question

所以我正在做一个笔记应用程序。这真的很简单，我正在尝试添加一个功能，以便当我长按注释时，我可以将其删除。它可以工作，但是 notes ArrayList 删除后不会刷新。重要的是要说这些功能是在适配器中应用的。我有一个名为 refresh 的函数，顾名思义，它会在创建新笔记之类的内容时刷新 Activity 。因此，删除笔记后，如果我创建一个新笔记，则会调用刷新函数，并且之前删除的笔记会消失，但前提是调用重新加载函数。但是，由于某种原因，我无法使用 onLongClickListener 中的重新加载函数有人可以帮帮我吗。这是我的代码的副本:

public class NotesAdapter extends RecyclerView.Adapter<NotesAdapter.NoteViewHolder> {
public static class NoteViewHolder extends RecyclerView.ViewHolder {
    public LinearLayout containerView;
    public TextView nameTextView;

    public NoteViewHolder(View view) {
        super(view);
        this.containerView = view.findViewById(R.id.note_row);
        this.nameTextView = view.findViewById(R.id.note_row_name);

        this.containerView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(final View view) {
                final Note note = (Note) containerView.getTag();

                PopupMenu popupMenu = new PopupMenu(view.getContext(), view);
                popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem menuItem) {
                        if (menuItem.getItemId() == R.id.delete) {
                            Toast.makeText(view.getContext(), "Note deleted", Toast.LENGTH_SHORT).show();
                            MainActivity.database.noteDao().delete(note.id);
                            return true;
                        } else {
                            return false;
                        }
                    }
                });
                popupMenu.inflate(R.menu.delete_menu);
                popupMenu.show();

                return true;
            }
        });

        this.containerView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Context context = v.getContext();
                Note note = (Note) containerView.getTag();
                Intent intent = new Intent(v.getContext(), NoteActivity.class);
                intent.putExtra("id", note.id);
                intent.putExtra("content", note.content);

                context.startActivity(intent);
            }
        });
    }
}

private List<Note> notes = new ArrayList<>();

@Override
public NoteViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.note_row, parent, false);

    return new NoteViewHolder(view);
}

@Override
public void onBindViewHolder(NoteViewHolder holder, int position) {
    Note current = notes.get(position);
    holder.containerView.setTag(current);
    holder.nameTextView.setText(current.content);
}

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

public void reload() {
    notes = MainActivity.database.noteDao().getAll();
    notifyDataSetChanged();
}

}

Answer 1

不用担心，这很简单。

做一个小改变

recyclerViewAdapter.notifyDataSetChanged(position);

它会工作得很好。