method cannot be resolved: adapter.swapCursor(loader);

Question

I am developping an Android app which loads reddits and put it in a db, I use an asynchron cursor loader in my fragment SubredditsFragment.class. This fragment contains an adapter, which has a cursor loader. When I stop or reset the loader, the loader needs to be swapped on my adapter.

    public class SubRedditsFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> {


        private List<SubRedditData> subRedditDataList;

        private IntentFilter filter;

        public static final String TAG = SubRedditsFragment.class.getName();

        private SubredditAdapter adapter;
        @Override
        public Loader<Cursor> onCreateLoader(int id, Bundle args) {
            String[] projection = null;
            String where = null;
            String[] whereArgs = null;
            String sortOrder = null;

            Uri queryUri = RedditContentProvider.CONTENT_URI;

            return new CursorLoader(getActivity(), queryUri, projection, where, whereArgs, sortOrder);
        }

@Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        Log.i(TAG,"Added broadcastreceiver");
        getActivity().registerReceiver(receiver,filter);
        adapter = new SubredditAdapter(getActivity().getApplicationContext(),subRedditDataList);    

        @Override
        public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        adapter.swapCursor(data);

            getLoaderManager().destroyLoader(loader.getId());
        }

        @Override
        public void onLoaderReset(Loader<Cursor> loader) {
            adapter.swapCursor(null);
        }

The problem is that I can't use the method adapter.swapCursor(), it's unknown for Android. I get the error message Cannot resolve method 'swapCursor(loader)'

here https://stackoverflow.com/questions/16134541/swapcursorcursor-is-undefined-for-the-type-simplecursoradapter — Kundan, Jul 13 '17 at 09:33

score 0 · Answer 1 · answered Jul 13 '17 at 17:23

0

add this code in your Adapter, mCursor is the global cursor variable

public void swapCursor(Cursor newCursor) {
        // Always close the previous mCursor first
        if (mCursor != null) mCursor.close();
        mCursor = newCursor;
        if (newCursor != null) {
            // Force the RecyclerView to refresh
            this.notifyDataSetChanged();
        }
    }

answered Jul 13 '17 at 17:23

Kundan

590
9
21

The important thing here is that recyclerview is used which does very little by itself. You have to add to the adapter. – Theo Nov 09 '17 at 14:45

method cannot be resolved: adapter.swapCursor(loader);

1 Answers1