How do I delete a list of objects from RecyclerView loaded in MainActivity from database upon button click from ChildActivity using Room

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.

refer this may be use full https://stackoverflow.com/questions/46494987/remove-recyclerview-adapter-item-from-activity — sasikumar, Sep 05 '18 at 05:26

score 0 · Answer 1 · edited Sep 05 '18 at 06:12

0

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()
    }

edited Sep 05 '18 at 06:12

Rohan Pawar

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answered Sep 05 '18 at 05:24

sasikumar

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Kindly put more illumination on this as per how to use this method from ChildActivity since getting the viewHolder position is not so straight forward. – Show Young Soyinka Sep 05 '18 at 05:28
best you can follow this approach https://stackoverflow.com/questions/46494987/remove-recyclerview-adapter-item-from-activity – sasikumar Sep 05 '18 at 05:30
Thanks, but the link does not address my issue – Show Young Soyinka Sep 05 '18 at 05:36

score 0 · Accepted Answer · answered Sep 05 '18 at 07:51

0

I guess this data which is passed to ChildActivity contains the IDof 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

answered Sep 05 '18 at 07:51

MrVasilev

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Your suggestion orientates me, I am working on a way to see if the data bundle contains the id as the entity object is defined with auto incremental primary key. I will get back to give you an update – Show Young Soyinka Sep 05 '18 at 11:39
Good to hear that and yes if you face with another problems just ask ;) – MrVasilev Sep 05 '18 at 12:18
I loaded the list of object with its id and delete. I got the id via getId() I defined in the entity class. I never knew the id was in the parcellable bundle until you told me. Thanks alot – Show Young Soyinka Sep 05 '18 at 15:21
I am glad I helped. Could you vote up my answer. Thanks in advance ;) – MrVasilev Sep 05 '18 at 16:06
I already did. The system only records votes from newbie like me but does not show it until I reach a certain reputation level. It's in there but not visible. Thanks. – Show Young Soyinka Sep 05 '18 at 16:53
Thank you very much – MrVasilev Sep 05 '18 at 16:55

How do I delete a list of objects from RecyclerView loaded in MainActivity from database upon button click from ChildActivity using Room

2 Answers2