now we need to create the order button that shows the popup for the final order. here you can select the size of the drink.

test.java

//BUTTON TO INITIATE POPUP
    public void ShowPopup(View v) {
        TextView txtclose;
        Button btnOrder;
        myDialog.setContentView(R.layout.custompopup);
        txtclose = (TextView) myDialog.findViewById(R.id.txtclose);
        btnOrder = (Button) myDialog.findViewById(R.id.btnorder);
        txtclose.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myDialog.dismiss();
            }
        });


        myDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        myDialog.show();


        TextView DrinkNameText;
        DrinkNameText = (TextView) myDialog.findViewById(R.id.DrinkNameText);
        DrinkNameText.setText(DrinkName);

        TextView DrinkTypeText;
        DrinkTypeText = (TextView) myDialog.findViewById(R.id.DrinkNameTypeText);
        DrinkTypeText.setText(DrinkType);

        /**
            TextView SetDrinkNameText = (TextView) findViewById(R.id.DrinkNameText);
            SetDrinkNameText.setText(DrinkName);
            TextView SetDrinkTypeText = (TextView) findViewById(R.id.DrinkNameTypeText);
            SetDrinkTypeText.setText(DrinkType);
        **/
        LinearLayout SetDrinkSizeSmall;
        SetDrinkSizeSmall = (LinearLayout) myDialog.findViewById(R.id.SetDrinkSize_Small);
        SetDrinkSizeSmall.setOnClickListener(new View.OnClickListener() {
//SETTING THE SIZE OF THE DRINK USING THE 3 BUTTONS IN THE POP UP! THIS IS ONE VALUE OF THE DRINK ORDER
            @Override
            public void onClick(View v) {
                DrinkSize = 1;
                DrinkSizeText = "Small";
                Toast Small = Toast.makeText(getApplicationContext(),
                        "Drink Size Set To Small",
                        Toast.LENGTH_SHORT);

                Small.show();
            }

        });


        LinearLayout SetDrinkSizeMedium;
        SetDrinkSizeMedium = (LinearLayout) myDialog.findViewById(R.id.SetDrinkSize_Medium);
        SetDrinkSizeMedium.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                DrinkSize = 2;
                DrinkSizeText = "Medium";
                Toast Medium = Toast.makeText(getApplicationContext(),
                        "Drink Size Set To Medium",
                        Toast.LENGTH_SHORT);

                Medium.show();
            }

        });



        LinearLayout SetDrinkSizeLarge;
        SetDrinkSizeLarge = (LinearLayout) myDialog.findViewById(R.id.SetDrinkSize_Large);
        SetDrinkSizeLarge.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                DrinkSize = 3;
                DrinkSizeText = "Large";
                Toast Large = Toast.makeText(getApplicationContext(),
                        "Drink Size Set To Large",
                        Toast.LENGTH_SHORT);

                Large.show();
            }

        });

    }