CODEWITHSUNDEEP
javaandroidsqlitenullpointerexceptionandroid-cursorloader
Saran Sankaran
Saran Sankaran

Reputation: 2606

onLoadFinish() gives null on cursor

I am trying to populate my UI with data from DB with Cursor loader.

Below is on my onCreateLoader()

@Override
public Loader < Cursor > onCreateLoader(int id, Bundle args) {

   String sortingOrder = MovieContract.Movie.COLUMN_RATING + " ASC";
   Uri uri = MovieContract.Movie.buildMovieDbUri();

   Log.v(LOG_TAG, "URI: " + uri.toString() + " sorting: " + sortingOrder);

   Cursor c = getActivity().getContentResolver().query(uri, MOVIE_PROJECTION, null, null, sortingOrder);

   if (c.moveToFirst())
       Log.v(LOG_TAG, "Movie ID: " + c.getInt(PROJ_MOVIE_ID - 1));
   else
       Log.v(LOG_TAG, "Fail");

   CursorLoader cc = new CursorLoader(getActivity(),
       uri,
       MOVIE_PROJECTION,
       null,
       null,
       sortingOrder);
   return cc;
}

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

Exception

java.lang.NullPointerException: Attempt to invoke virtual method 'android.database.Cursor itsme.com.moviecatalogue.GridViewAdapter.swapCursor(android.database.Cursor)' on a null object reference

In the above code cursor c gets me all the data correctly. But I get a NullPointerException on swapCursor() in onLoadFinished(). I dont understand what am I doing wrong.

Upvotes: 0

Views: 498

Answers (2)

RASHID MOHAMMAD
RASHID MOHAMMAD

Reputation: 21

To set mAdapter Properly add following code before using mAdapter

mAdapter = new <nameOfCursorAdapter>(this,null);

for Example if your Cursor adapter name is myCustomCursorAdapter then code will like this
mAdapter = new myCustomCursorAdapter(this,null);

Upvotes: 1

TimoStaudinger
TimoStaudinger

Reputation: 42460

You are trying to call method swapCursor() on mAdapter, which equals null at this point. This results in the NullPointerException you are seeing.

To resolve this, make sure that mAdapter is set properly before the method call.

Upvotes: 2

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