How to save changes in ArrayList when switching ListFragment using Drawer ListView

Question

I have a Drawer Listview with items Fruits, Veggies, Meat. Each has a class that extends ListFragment. I also created a Product class for my ArrayList and ArrayAdapter. But everytime i switch between ListFragment and switch back, the changes I did also reset and not saved.

Here is my Current codes:

product_adapter.java

//imports ....

public class product_adapter extends ArrayAdapter<product> {

    public product_adapter(Context context, ArrayList<product> prod) {
        super(context, 0, prod);
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        final product products = getItem(position);

        // Some Codes for Instantiation and LayoutInflater


        itemAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                products.itemQuantity ++;
                viewHolder.itemQuantity.setText(String.valueOf(products.getItemQuantity()));
                notifyDataSetChanged();
            }
        });
        return convertView;
    }
}

Fruit.java

public class Fruit extends ListFragment {

    public ArrayList<product> products;
    public product_adapter productAdapter;

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        products = new ArrayList<product>();

        products.add(new product("Apple", 18.00 /*Price*/, 0 /*Quantity*/));
        products.add(new product("Orange", 16.00 /*Price*/, 0 /*Quantity*/));

        productAdapter = new product_adapter(getActivity(),products);

        setListAdapter(productAdapter);
    }
}

Veggies and Meat Class is constructed the same way as the Fruit class

MainActivity with the ListView

//Some codes here for the creating ListView
        listView = (ListView) findViewById(R.id.categoryView);
        listView.setAdapter(new category_adapter(this, categories));
        drawerLayout = (DrawerLayout) findViewById(R.id.drawerView);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
                ListFragment listFragment = null;
                switch (position){
                    case 0:
                        listFragment = new Fruit();
                        break;
                    case 1:
                        listFragment = new Veggies();
                        break;
                    case 2:
                        listFragment = new Meat();
                        break;
                }

                FragmentManager fragmentManager = getSupportFragmentManager();
                fragmentManager.beginTransaction().replace(R.id.itemLayout,listFragment).commit();
                drawerLayout.closeDrawers();
            }
        });

sry about that i forgot to mention that it is a drawer listview — mark.jon, Aug 07 '16 at 11:04
you need expandable list on drawer to categorise your products?? — Moulesh, Aug 07 '16 at 11:06
i ddnt use expandable listview on drawer, i just used listview for the drawer and used onitemclicklistener to open the listfragments. ill try your suggestion and use expandable listview rather than using listview and listfragment. — mark.jon, Aug 07 '16 at 11:24

score 0 · Answer 1 · edited May 23 '17 at 12:08

0

@mark.jon Here is the code implemented by me for producing categorised list on drawer using expandable list.. Hope this fulfills your needs.. Default Navigation Drawer View to ExpandableListView

edited May 23 '17 at 12:08

Community

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answered Aug 07 '16 at 11:38

Moulesh

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How to save changes in ArrayList when switching ListFragment using Drawer ListView

1 Answers1