/*I have cart and confirm option in my onCreateOptionsMenu of activity, confirm option is not visible

now when I click on cart I am replacing activity or current fragment on activity with cartfragment.below is  onOptionsItemSelected from activity */


 override fun onOptionsItemSelected(item: MenuItem): Boolean {
        return when (item.itemId) {
            R.id.action_cart -> {


                val myFragment =supportFragmentManager.findFragmentById(R.id.placeholder)

                if (myFragment != null && myFragment is CartFragment) {

                    Toast.makeText(applicationContext,"Already in Cart",Toast.LENGTH_SHORT).show()

                    return true
                }


                var frag=CartFragment()
                supportFragmentManager.beginTransaction().replace(R.id.placeholder, frag,"CART").addToBackStack(null).commit()

                true
            }

            else -> super.onOptionsItemSelected(item)
        }
    }

/*
now in cartfragment  i am making confirm option visible,on click of this confirm option I am replacing cartfragment with finalCartFragment. */

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        val id = item.itemId
        when (id) {
            R.id.order -> {
                //update the cart

                dbh = DataBaseHandler(activity?.applicationContext!!)
                dbh!!.updateCartToFinalView(cartList)
                var fragment: FinalCartFragment = FinalCartFragment()
                activity?.supportFragmentManager?.beginTransaction()
                    ?.replace(R.id.placeholder, fragment)?.addToBackStack(null)?.commit()
                return true
            }


        }

        return false
    }

/*now inside the finalCartFragment , the cart option is still there, and when I click on that it will take me to cartfragment again ,all good (it is getting call from activities onOptionsItemSelected).
now when I do backpress, I go back to finalCartFragment, I don't want this to happen.

I tried following in my finalCartFragment , but it is not working */

 setHasOptionsMenu(true) in onCrete..and following


    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
        menu.clear()
        inflater.inflate(R.menu.menu_item, menu);

        val order = menu.findItem(R.id.order)
        order?.setVisible(true)

    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        val id = item.itemId
        when (id) {
            R.id.order ->{
                //show dialog
                showdialog()
            }
            R.id.action_cart->{
                var fragment=CartFragment()
                activity?.supportFragmentManager?.beginTransaction()
                    ?.replace(R.id.placeholder, fragment)?.commit()

                return true
            }


        }

        return false
    }