在使用Room从ChildActivity中单击按钮后，如何从数据库中的MainActivity中加载的RecyclerView中删除对象列表

Question

I have a RecyclerView in MainActivity that loads saved data from database using Android Architecture Components ( Room ), this data is then passed to ChildActivity via intent as a parcellable bundle. I wish to be able to delete this data upon button click from ChildActivity: the issue I have now is to get the RecyclerView holder position in order to delete this particular part of the RecyclerView data. I am aware this is easier by swipe to delete from MainActivity, but I don't want to do that since I will be deleting from ChildActivity upon button click from the context. I have come up with the below method, but it's not just working;

public void deleteMovie( RecyclerView.ViewHolder viewHolder){ 
    int position = viewHolder.getAdapterPosition();
    List<DataObject> movie = mAdapter.getMovieList();
    mDb.dataDao().deleteData(movie.get(position);
}

I don't know where to go from here. This method works well for overriden onSwipe method of itemTouchHelper class, but this is not my intention. Kindly help bail me out.

Answer 1

After deleting the data refresh your adapter

 public void deleteMovie( RecyclerView.ViewHolder viewHolder){
        int position = viewHolder.getAdapterPosition();
        List<DataObject> movie = mAdapter.getMovieList();
        mDb.dataDao().deleteData(movie.get(position);
        mAdapter.notifydatasetchanged()
    }

Answer 2

I guess this data which is passed to ChildActivity contains the ID of the record in the Database's table? So, you can delete this record by ID or what you use for @PrimaryKey

If this suggestion not helps, please provide more code for better understanding