Question

所以有一个recyclerViewAdapter填充来自RoomDB的数据并显示它。当用户长按每一行并选择删除时，我想执行删除查询。我应该如何检索所选行的数据（例如名称或id）并在OnContextItemSelected的MainActivity中接收它，以便我可以从我的Db中删除它？ -Thanks

 private StudentViewHolder(View itemView) {
        super(itemView);
        nameItemView = itemView.findViewById(R.id.nameTextView);
        numberItemView = itemView.findViewById(R.id.numberTextView);
        imageItemView = itemView.findViewById(R.id.profile_image);
        idItemView = itemView.findViewById(R.id.idView);
        itemView.setOnCreateContextMenuListener(this);        }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo contextMenuInfo) {

        menu.setHeaderTitle("Select Action");
        menu.add(Menu.NONE,0,getAdapterPosition(),"Delete");
        menu.add(Menu.NONE,1,getAdapterPosition(),"Update");
    }

MainActivity.java 我尝试了很多东西，却找不到线索。

@Override
public boolean onContextItemSelected(MenuItem item) {
    AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo)item.getMenuInfo();????
    Log.e(,"info ="+ info);
    Student student = mStudentViewModel.getAllStudents().getValue().get(item.getGroupId());?????
    Student student1 = adapter.getClass().geti?????
    switch (item.getGroupId()){?????
        case 0 :
            break;

        case 1:
              break;
    }
    return true;
}

Answer 1

当用户通过覆盖onSwiped滑动recyclerView时，我设法执行了删除查询！

            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder,
                                 int direction) {
                int position = viewHolder.getAdapterPosition();
                S s;
                s= adapterAll.getSAtPosition(position);

                // Delete
                mStudentViewModel.delete(s);

            }
        });

将所选行的数据传递给OnContextItemSelected以执行数据库删除

1 个答案: