从活动中删除RecyclerView适配器项

Question

I have Quote List class QuoteListFragment. where I am loading data in adapter from server like this

private ArrayList<Quote> quotes;
quotes = response.body();
NewQuoteAdapter adapter = new NewQuoteAdapter(getContext(), response.body());
mQuoteList.setAdapter(adapter);

and RecyclerView Adapter called NewQuoteAdapter

I am displaying Item in details with QuoteViewFragment . I have implemented a button called "delete" in this fragment and I want to give the user a chance to delete that quote from fragment so When the user goes back to the list, it disappears from the list. I have no idea how to achieve this. Let me know if someone can give me a solution for this. Thanks

Answer 1

well you have a list, and adapter, and a recyclerview

ArrayList<String> myQuoteList = new ArrayList<String>();
MyCustomAdapter adapter = new MyCustomAdapter(myQuoteList);
rcvQuotes.setAdapter(adapter);

Then in your delete you can just do

private void deleteAtIndex(int index){
      myQuoteList.remove(index);
      adapter.notifyDataSetChanged();
}

//make a interface.

public interface fragmentCallback{
     boolean onQuoteDeleted(Quote deleteQuote);
}

have your activity implement the interface:

myActivity implements fragmentCallback{
     public boolean onQuoteDeleted(Quote deletedQuote){
         if(myQuotelist.contains(deleteQuote){
              myQuoteList.remove(deleteQuote);
              adapter.notifyDataSetChanged();
         }
     }
}

then in fragment simpley

myFragment.setQuote(selectedQuote);

inside of fragment just do:

       @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        try{
            mFragmentCallback = (IFragmentCallback) context;

        }catch (Exception ex){
            A35Log.e(TAG, "Parent Context does not implement fragmentCallback");

        }
    }

public void setQuote(Quote showQuote){
     mSelectedQuote = showQuote;
}

btnDelete_onClick(){
    if(mFragmentCallback != null){
         mFragmentCallback.onDeleteQuote(mSelectedQuote);
    }
}

you can handle it by selected index of the row, or by last index, or first index, or you can add a long touch listener or trash can to the row item. how you get the index is up to you.

That's it, that is all there is to it.

Answer 2

Arraylist.remove(index)

recycleradapter.notifydatasetchanged()

Answer 3

Get the index of clicked item eg index = 4 list of quote eg quotesList.

quotesList.remove(index);
adapter.notifyDataSetChanged();