eeprevost · July 10, 2017 20:24 · Jun 25, 2015 · Jun 17, 2015
diff --git a/MainActivity.java b/MainActivity.java
@@ -1,6 +1,5 @@
 package com.example.android.justjava;
 
-
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.view.View;

diff --git a/MainActivity.java b/MainActivity.java
@@ -0,0 +1,103 @@
+package com.example.android.justjava;
+
+
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.view.View;
+import android.widget.CheckBox;
+import android.widget.TextView;
+
+/**
+ * This app displays an order form to order coffee.
+ */
+public class MainActivity extends AppCompatActivity {
+
+    int quantity = 2;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+    }
+
+    /**
+     * This method is called when the plus button is clicked.
+     */
+    public void increment(View view) {
+        quantity = quantity + 1;
+        displayQuantity(quantity);
+    }
+
+    /**
+     * This method is called when the minus button is clicked.
+     */
+    public void decrement(View view) {
+        quantity = quantity - 1;
+        displayQuantity(quantity);
+    }
+
+    /**
+     * This method is called when the order button is clicked.
+     */
+    public void submitOrder(View view) {
+        // Figure out if the user wants whipped cream topping
+        CheckBox whippedCreamCheckBox = (CheckBox) findViewById(R.id.whipped_cream_checkbox);
+        boolean hasWhippedCream = whippedCreamCheckBox.isChecked();
+
+        // Figure out if the user wants whipped cream topping
+        CheckBox chocolateCheckBox = (CheckBox) findViewById(R.id.chocolate_checkbox);
+        boolean hasChocolate = chocolateCheckBox.isChecked();
+
+        // Calculate the price
+        int price = calculatePrice();
+
+        // Display the order summary on the screen
+        String message = createOrderSummary(price, hasWhippedCream, hasChocolate);
+        displayMessage(message);
+    }
+
+    /**
+     * Calculates the price of the order.
+     *
+     * @return total price
+     */
+    private int calculatePrice() {
+        return quantity * 5;
+    }
+
+    /**
+     * Create summary of the order.
+     *
+     * @param price           of the order
+     * @param addWhippedCream is whether or not to add whipped cream to the coffee
+     * @param addChocolate    is whether or not to add chocolate to the coffee
+     * @return text summary
+     */
+    private String createOrderSummary(int price, boolean addWhippedCream, boolean addChocolate) {
+        String priceMessage = "Name: Lyla the Labyrinth";
+        priceMessage += "\nAdd whipped cream? " + addWhippedCream;
+        priceMessage += "\nAdd chocolate? " + addChocolate;
+        priceMessage += "\nQuantity: " + quantity;
+        priceMessage += "\nTotal: $" + price;
+        priceMessage += "\nThank you!";
+        return priceMessage;
+    }
+
+    /**
+     * This method displays the given quantity value on the screen.
+     */
+    private void displayQuantity(int numberOfCoffees) {
+        TextView quantityTextView = (TextView) findViewById(
+                R.id.quantity_text_view);
+        quantityTextView.setText("" + numberOfCoffees);
+    }
+
+    /**
+     * This method displays the given text on the screen.
+     */
+    private void displayMessage(String message) {
+        TextView orderSummaryTextView = (TextView) findViewById(R.id.order_summary_text_view);
+        orderSummaryTextView.setText(message);
+    }
+
+}
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