How to delete item from android listview and SQLite database

I have created a small application to record students university assignments. The user can create an assignment which is then displayed in a listview in another activity. When the user clicks on an individual item in the listview, a dialogue opens which either allows them to delete this assignment or cancel and return. I cant see where I am going wrong, the assignment wont delete from the database. Any suggestions where I am going wrong??

//My delete information method from my dbhelper class

public void deleteInformation(String assID, SQLiteDatabase sqLiteDatabase){
    String selection = ASSIGNMENT_ID+" LIKE ?";
    String [] selectionArguments = {assID};
    sqLiteDatabase.delete(TABLE_NAME_ASSIGNMENT,selection,selectionArguments);
}

//My view assignments class which I use to view the assignments in a listview public class ViewAssignments extends ActionBarActivity implements AdapterView.OnItemSelectedListener { ListView listView; SQLiteDatabase sqLiteDatabase; DbHelper dbHelper; ListDataAdapter listDataAdapter; Spinner spinner; String noteid;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_view_assignments);
    dbHelper = new DbHelper(getApplicationContext());
    sqLiteDatabase = dbHelper.getReadableDatabase();
    spinner=(Spinner)findViewById(R.id.spinnerAssignments);
    loadSpinnerData();

}


private void loadSpinnerData() {
    // database handler
    DbHelper db = new DbHelper(getApplicationContext());

    // Spinner Drop down elements
    List<String> lables = db.getAssignmentSubjects();

    // Creating adapter for spinner
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, lables);

    // Drop down layout style - list view with radio button
    dataAdapter.setDropDownViewResource(android.R.layout.simple_list_item_checked);

    // attaching data adapter to spinner
    spinner.setAdapter(dataAdapter);
    spinner.setOnItemSelectedListener(this);
}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

    listView = (ListView) findViewById(R.id.listView2);
    listDataAdapter = new ListDataAdapter(getApplicationContext(), R.layout.row_layout_listview);
    listView.setAdapter(listDataAdapter);
    // On selecting a spinner item
    String label = parent.getItemAtPosition(position).toString();
    Toast.makeText(getApplicationContext(), label, Toast.LENGTH_LONG).show();
    // Showing selected spinner item
    SQLiteDatabase db = dbHelper.getWritableDatabase();
    Cursor cursor = dbHelper.getSelectedAssignments(label, db);
    /*listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            AlertDialog.Builder builder = new AlertDialog.Builder(viewAssignments.this);
            builder.setCancelable(true);
            builder.setIcon(R.drawable.iconpic);

            builder.setTitle("Options");
            builder.setMessage("Working on it!");

            builder.show();
        }
    });*/
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, final long id) {

            dbHelper = new DbHelper(getApplicationContext());
            sqLiteDatabase = dbHelper.getReadableDatabase();

            AlertDialog.Builder builder = new AlertDialog.Builder(viewAssignments.this);
            builder.setCancelable(true);
            builder.setIcon(R.drawable.iconpic);

            builder.setTitle("Are you sure you want to delete?");
            builder.setNegativeButton("Yes",new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    long passid = id;
                    dbHelper.deleteInformation(String.valueOf(passid),sqLiteDatabase);
                }
            });
            builder.setPositiveButton("Cancel",null);
            builder.show();

            Toast.makeText(viewAssignments.this,"You selected : " + position,Toast.LENGTH_SHORT).show();

            dbHelper.deleteInformation(String.valueOf(id),sqLiteDatabase);

        }
    });


    if (cursor.moveToFirst()) {
        do {
            String  module, assignment, dueDate, weighting, notes;
            module = cursor.getString(1);
            assignment = cursor.getString(3);
            dueDate = cursor.getString(4);
            weighting = cursor.getString(2);
            notes = cursor.getString(5);
            DataProvider dataProvider = new DataProvider(weighting,module,assignment,dueDate,notes);
            listDataAdapter.add(dataProvider);
            registerForContextMenu(listView);
        }while(cursor.moveToNext());
    }
    cursor.close();
    System.out.print(label);
    ;

}

@Override
public void onNothingSelected(AdapterView<?> parent) {

}