SharedPreference

//Adapter saved data

String key = "Key";
                List<CartProductListPojo> cartProductListPojos = new ArrayList();
                cartProductListPojos.add(new CartProductListPojo( getItemId.getProductImage(),
                        getItemId.getProductName(),
                        getItemId.getProductBrandName(), getItemId.getProductCategory(), 1,
                        getItemId.getProductPrice()));

                SharedPreferences shref;
                SharedPreferences.Editor editor;
                shref = context.getSharedPreferences("Name", Context.MODE_PRIVATE);

                Gson gson = new Gson();
                String json = gson.toJson(cartProductListPojos);

                editor = shref.edit();
                /*editor.remove(key).commit();*/
                editor.putString(key, json);
                editor.commit();

//CartActivity retrieve data

 SharedPreferences sharedPreferences = getSharedPreferences("Name", MODE_PRIVATE);
        String key = "Key";
        Gson gson = new Gson();
        String response = sharedPreferences.getString(key, "");
        List<CartProductListPojo> cartProductListPojo = gson.fromJson(response,
                new TypeToken<List<CartProductListPojo>>() {}.getType());

for (int i = 0; i < cartProductListPojo.size(); i++){
            productsName = cartProductListPojo.get(i).getProductName();
            Toast.makeText(this, productsName, Toast.LENGTH_SHORT).show();

            cartProductListPojos.add(new CartProductListPojo(productsImage, productsName,
                    productsBrandName, productsCategory, 1, productsPrice));

            cartProductListAdapter = new CartProductListAdapter(this, cartProductListPojos);
            recyclerView.setLayoutManager(new LinearLayoutManager(this));
            recyclerView.setAdapter(cartProductListAdapter);
        }