Question

I have a database manager class where i build a table that has two columns. the first column being an integer, and i am trying to write a method that will return all values in that column as a list:

public List<Integer> getAllStyleIDs(){
        List<Integer> results = null;
        SQLiteDatabase db = this.getReadableDatabase();
        // Select All Query
        String selectQuery = "select * from " + DBConstants.allStyles;

        Cursor cursor = db.rawQuery(selectQuery, null);

        // looping through all rows and adding to list
        if (cursor.moveToFirst()) {
            do {

                results.add(cursor.getInt(0));


            } while (cursor.moveToNext());
        }
        cursor.close();
        db.close();

        return results;
    }

but i am getting a null point exception

any ideas?

Answer 1

Your list results is null, then you attempt to add to it. Try this:

List<Integer> results = new ArrayList<Integer>();