如何从对话框类中删除ListView中的项？

Question

我创建了自己的对话框类。该类有一个按钮，用于从列表视图中删除项目（这是主要的acctivity_main.xml）。当我按下删除按钮时，项目不会被删除。

我已经看过这个话题Android: how to remove an item from a listView and arrayAdapter。只是看起来用户不知道如何正确获取项目索引，我相信我已经正确完成了。

Remove ListView items in Android这个非常接近。但是在我的代码中我创建了自己的对话框，这个对话框正在使用正面和负面按钮。我在对话框类和mainActivity之间传递变量。

OnCreate中的onClickListener与MainActivity

 mFoodDataAdapter = new FoodDataAdapter();
        final ListView listFoodData = (ListView) findViewById(R.id.listView);
        listFoodData.setAdapter(mFoodDataAdapter);

        //Handle clicks on the ListView
        listFoodData.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapter, View view, int whichItem, long id) {

                FoodData tempFoodData = mFoodDataAdapter.getItem(whichItem);
                //create a new dialog window
                DialogShowFood dialog = new DialogShowFood();
                // send in a reference to the note to be shown
                dialog.sendFoodDataSelected(tempFoodData);

                FoodDataAdapter adapter1 = new FoodDataAdapter();

                /*this is where i send the data to the DialogShowFood.java*/
                dialog.sendFoodDataAdapter(adapter1, whichItem);

                // show the dialog window with the note in it
                dialog.show(getFragmentManager(),"");
            }
        });

这是我的对话框“DialogShowFood.java”

public class DialogShowFood extends DialogFragment {

    FoodData mFood;
    MainActivity.FoodDataAdapter mAdapter;
    int  mitemToDelete;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState){
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

        LayoutInflater inflater = getActivity().getLayoutInflater();
        View dialogView = inflater.inflate(R.layout.dialog_show_food, null);

        Button btnDelete = (Button) dialogView.findViewById(R.id.btnDelete);

        builder.setView(dialogView).setMessage("Your food");

        /*this sends the item to delete to the adapter*/
        btnDelete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mAdapter.deleteFoodData(mitemToDelete);
                dismiss();
            }
        });
        return builder.create();
    }

    /*this gets the data to delete from the MainActivity*/
    public void sendFoodDataAdapter(MainActivity.FoodDataAdapter adapter1, int whichItem) {
        mAdapter = adapter1;
        mitemToDelete = whichItem;
    }
}

适配器内的功能

  /*this is the function in the base adapter to delete the item*/
   public void deleteFoodData(int n){
            Toast.makeText(MainActivity.this,Integer.toString(n), Toast.LENGTH_SHORT).show();
            foodDataList.remove(n);
            notifyDataSetChanged();
        }

Toast输出要删除的项目的正确索引，它不会因某种原因删除该项目。