MainActivity

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <ScrollView
        android:id="@+id/svMain"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        //Content
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <ImageView
                android:src="@drawable/bgcoffee"
                android:scaleType="centerCrop"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />

            //Main Content
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                android:paddingLeft="@dimen/activity_horizontal_margin"
                android:paddingRight="@dimen/activity_horizontal_margin"
                android:paddingTop="@dimen/activity_vertical_margin"
                android:paddingBottom="@dimen/activity_vertical_margin">
                //Customer Name
                <EditText
                    android:id="@+id/txtCustomerName"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="Customer Name"
                    android:inputType="textMultiLine"
                    android:textSize="24sp"/>

                //Type of Order
                <RadioGroup
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:layout_margin="16dp"
                    >

                    <RadioButton
                        android:id="@+id/rbCoffeeBlack"
                        android:layout_width="0dp"
                        android:layout_weight="1"
                        android:layout_height="wrap_content"
                        android:text="Black - P10"
                        android:textSize="24sp"
                        android:textAppearance="?android:textAppearanceMedium"
                        android:onClick="OrderCoffee"/>

                    <RadioButton
                        android:id="@+id/rbCoffeeCreamy"
                        android:layout_width="0dp"
                        android:layout_weight="1"
                        android:layout_height="wrap_content"
                        android:text="Creamy-P15"
                        android:textSize="24sp"
                        android:textAppearance="?android:textAppearanceMedium"
                        android:onClick="OrderCoffee"/>
                </RadioGroup>

                //Label Addons
                <TextView
                    android:text="Add-on's P5:"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:textSize="24sp"
                    android:layout_marginBottom="16dp"/>

                //Addons
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:layout_marginBottom="16dp">
                    <CheckBox
                        android:id="@+id/cbAddonChoco"
                        android:layout_width="0dp"
                        android:layout_weight="1"
                        android:layout_height="wrap_content"
                        android:text="Chocolate"
                        android:textSize="24sp"
                        android:onClick="PlusAddon"
                        />
                    <CheckBox
                        android:id="@+id/cbAddonCream"
                        android:layout_width="0dp"
                        android:layout_weight="1"
                        android:layout_height="wrap_content"
                        android:text="Cream"
                        android:textSize="24sp"
                        android:onClick="PlusAddon"
                        />
                </LinearLayout>

                //Number of Orders
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:layout_marginBottom="16dp">

                    <Button
                        android:id="@+id/btnDecOrder"
                        android:layout_width="0dp"
                        android:layout_weight="1"
                        android:layout_height="wrap_content"
                        android:text="-"
                        android:textSize="26sp"
                        android:onClick="DecOrder"
                        android:background="@color/colorPrimary"/>

                    <TextView
                        android:id="@+id/txtNumberOfOrders"
                        android:text="1"
                        android:layout_width="0dp"
                        android:layout_weight="1"
                        android:layout_height="wrap_content"
                        android:textSize="27sp"
                        android:layout_marginBottom="16dp"
                        android:textAlignment="center"
                        android:textStyle="bold"
                        />

                    <Button
                        android:id="@+id/btnIncOrder"
                        android:layout_width="0dp"
                        android:layout_weight="1"
                        android:layout_height="wrap_content"
                        android:text="+"
                        android:textSize="26sp"
                        android:onClick="IncOrder"
                        android:background="@color/colorPrimary"/>
                </LinearLayout>

                //Total Price
                <TextView
                    android:id="@+id/txtVPrice"
                    android:text="Total Price:"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:textSize="26sp"
                    android:layout_marginBottom="16dp"
                    android:textStyle="bold"
                    />

                //Order Slip
                <LinearLayout
                    android:id="@+id/llOrderSlip"
                    android:layout_width="match_parent"
                    android:layout_height="0dp"
                    android:orientation="vertical"
                    >

                    <View
                        android:layout_width="match_parent"
                        android:layout_height="1dp"
                        android:background="#000"/>

                    <TextView
                        android:id="@+id/txtVCustomerName"
                        android:text="Name:"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:textSize="24sp"
                        android:layout_marginBottom="16dp"
                        android:textStyle="bold"
                        />
                    <TextView
                        android:id="@+id/txtVCustomerOrder"
                        android:text="Order:"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:textSize="24sp"
                        android:layout_marginBottom="16dp"
                        android:textStyle="bold"
                        />
                    <TextView
                        android:id="@+id/txtVCustomerAddons"
                        android:text="Addon's:"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:textSize="24sp"
                        android:layout_marginBottom="16dp"
                        android:textStyle="bold"
                        />

                    <TextView
                        android:id="@+id/txtGrandPrice"
                        android:text="Total Price: "
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:textSize="24sp"
                        android:layout_marginBottom="16dp"
                        android:textStyle="bold"
                        />

                    <View
                        android:layout_width="match_parent"
                        android:layout_height="1dp"
                        android:background="#000"/>
                </LinearLayout>

                <Button
                    android:id="@+id/btnOrderNow"
                    android:text="Order"
                    android:layout_width="match_parent"
                    android:layout_height="80dp"
                    android:onClick="OrderNow"
                    android:textSize="26sp"
                    android:background="@color/colorPrimaryDark"/>

            </LinearLayout>

        </RelativeLayout>


    </ScrollView>

</LinearLayout>

MainActivity.java

package io.github.devinceble.ordertaker;

import android.app.ActionBar;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.ScrollView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    boolean orderStat = true;
    int PriceBlack = 10;
    int PriceCreamy = 15;
    int PriceAddons = 5;

    int NumberOfAddons = 0;
    int NumberOfOrders = 1;
    int TotalOrderPrice = 0;
    int GrandTotal = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void PlusAddon(View view){
        int LocalTotalPrice = 0;
        TextView txtVPrice = (TextView) findViewById(R.id.txtVPrice);
        CheckBox thisCheck = (CheckBox) view;
        CheckBox cbChocolate = (CheckBox) findViewById(R.id.cbAddonChoco);
        CheckBox cbCream = (CheckBox) findViewById(R.id.cbAddonCream);

        if(thisCheck.getId() == R.id.cbAddonChoco) {
            if (cbChocolate.isChecked()) {
                NumberOfAddons += 1;

            } else {
                NumberOfAddons -= 1;
            }
        }else {

            if (cbCream.isChecked()) {
                NumberOfAddons += 1;
            } else {
                NumberOfAddons -= 1;
            }
        }

        LocalTotalPrice = (TotalOrderPrice + (NumberOfAddons) * PriceAddons) * NumberOfOrders;
        GrandTotal = LocalTotalPrice;
        txtVPrice.setText("Total Price: P " + LocalTotalPrice);
    }

    public void OrderCoffee(View view){
        int LocalTotalPrice;
        RadioButton thisRadio = (RadioButton) view;
        TextView txtVPrice = (TextView) findViewById(R.id.txtVPrice);
        TextView txtOrder = (TextView) findViewById(R.id.txtVCustomerOrder);

        if(thisRadio.getId() == R.id.rbCoffeeBlack){
            TotalOrderPrice = PriceBlack;
            txtOrder.setText("Order: Black");
        }else{
            TotalOrderPrice = PriceCreamy;
            txtOrder.setText("Order: Creamy");
        }

        LocalTotalPrice = (TotalOrderPrice + (NumberOfAddons) * PriceAddons) * NumberOfOrders;
        GrandTotal = LocalTotalPrice;
        txtVPrice.setText("Total Price: P " + LocalTotalPrice);

    }

    public void DecOrder(View view){
        ChangeNumberOrders(false);
    }

    public void IncOrder(View view){
        ChangeNumberOrders(true);
    }

    private void ChangeNumberOrders(boolean stat) {
        int LocalTotalPrice, LocalPriceAddon;

        TextView txtNumberOfOrders = (TextView) findViewById(R.id.txtNumberOfOrders);
        TextView txtVPrice = (TextView) findViewById(R.id.txtVPrice);
        if(stat){
            NumberOfOrders += 1;
        }else{
            if(NumberOfOrders > 1) {
                NumberOfOrders -= 1;
            }
        }

        LocalPriceAddon = (NumberOfAddons * PriceAddons) * NumberOfOrders;
        LocalTotalPrice = TotalOrderPrice * NumberOfOrders + LocalPriceAddon;
        GrandTotal = LocalTotalPrice;
        txtNumberOfOrders.setText("" + NumberOfOrders);
        txtVPrice.setText("Total Price: P " + LocalTotalPrice);

    }

    public void OrderNow(View view){
        String AddonList;
        String ExtraMessage;
        Button thisButton = (Button) view;
        TextView txtVAddon = (TextView) findViewById(R.id.txtVCustomerAddons);
        TextView txtVOrder = (TextView) findViewById(R.id.txtVCustomerOrder);
        TextView txtVCustomerName = (TextView) findViewById(R.id.txtVCustomerName);
        TextView txtGrandPrice = (TextView) findViewById(R.id.txtGrandPrice);
        EditText txtCustomerName = (EditText) findViewById(R.id.txtCustomerName);
        CheckBox cbChocolate = (CheckBox) findViewById(R.id.cbAddonChoco);
        CheckBox cbCream= (CheckBox) findViewById(R.id.cbAddonCream);
        TextView txtVPrice = (TextView) findViewById(R.id.txtVPrice);
        TextView txtNumberOfOrders = (TextView) findViewById(R.id.txtNumberOfOrders);
        RadioButton rbBlack = (RadioButton) findViewById(R.id.rbCoffeeBlack);
        RadioButton rbCreamy = (RadioButton) findViewById(R.id.rbCoffeeCreamy);
        ScrollView svMain = (ScrollView) findViewById(R.id.svMain);

        if(thisButton.getText() == "Reset"){
            int LocalTotalPrice;
            NumberOfAddons = 0;
            NumberOfOrders = 1;
            TotalOrderPrice = 0;
            GrandTotal = 0;

            txtCustomerName.setText("");
            cbChocolate.setChecked(false);
            cbCream.setChecked(false);
            rbBlack.setChecked(false);
            rbCreamy.setChecked(false);
            LocalTotalPrice = (TotalOrderPrice + (NumberOfAddons) * PriceAddons) * NumberOfOrders;
            GrandTotal = LocalTotalPrice;
            txtVPrice.setText("Total Price: P " + LocalTotalPrice);
            txtNumberOfOrders.setText("" + NumberOfOrders);
            svMain.fullScroll(ScrollView.FOCUS_UP);
        }else{
            AddonList = "Addons: \n";
            if(cbChocolate.isChecked()){
                AddonList += "Chocolate \n";
            }
            if(cbCream.isChecked()){
                AddonList += "Creamy \n";
            }

            txtVAddon.setText(AddonList);
            txtGrandPrice.setText("Total Price: P" + GrandTotal);
            txtVCustomerName.setText(txtCustomerName.getText());

            ExtraMessage = "Order Taker\n";
            ExtraMessage += txtVCustomerName.getText() + "\n";
            ExtraMessage += txtVOrder.getText() + "\n";
            ExtraMessage += txtVAddon.getText() + "\n";
            ExtraMessage += txtGrandPrice.getText() + "\n";

            //Send Email
            Intent intent = new Intent(Intent.ACTION_SENDTO);
            intent.setData(Uri.parse("mailto:")); // only email apps should handle this
            intent.putExtra(Intent.EXTRA_SUBJECT, "My Coffee Order");
            intent.putExtra(Intent.EXTRA_TEXT, ExtraMessage);

            if (intent.resolveActivity(getPackageManager()) != null) {
                startActivity(intent);
            }
        }




        LinearLayout OrderSlipContent = (LinearLayout) findViewById(R.id.llOrderSlip);
        if (orderStat){
            thisButton.setText("Reset");
            OrderSlipContent.setLayoutParams(
                    new LinearLayout.LayoutParams(
                            LinearLayout.LayoutParams.MATCH_PARENT, //Width
                            LinearLayout.LayoutParams.WRAP_CONTENT //Height
                    )
            );

            orderStat = false;
        }else{
            thisButton.setText("Order");
            OrderSlipContent.setLayoutParams(
                    new LinearLayout.LayoutParams(
                            LinearLayout.LayoutParams.MATCH_PARENT,//Width
                            0 //Height
                    )
            );
            orderStat = true;
        }
    }
}