JustJava MainActivity.java

package com.example.android.justjava;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.text.NumberFormat;

/**
 * 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) {
        if (quantity >= 100) {
            //show error message as a toast
            Toast.makeText(this, getText(R.string.too_many_coffees), Toast.LENGTH_SHORT).show();
            //exit method early as there is nothing to do
            return;
        }
        quantity += 1;
        displayQuantity(quantity);

    }

    /**
     * This method is called when the minus button is clicked.
     */
    public void decrement(View view) {
        if (quantity == 1) {
            //show error message as a toast
            Toast.makeText(this, getText(R.string.too_few_coffees), Toast.LENGTH_SHORT).show();
            //exit method early as there is nothing to do
            return;
        }
        quantity -= 1;
        displayQuantity(quantity);
    }

    /**
     * This method is called when the order button is clicked.
     */
    public void submitOrder(View view) {
        //find and store the name of the user
        EditText nameField = findViewById(R.id.name_field);
        String name = nameField.getText().toString();

        //add whipped cream to the coffee order
        CheckBox whippedCreamCheckBox = findViewById(R.id.whipped_cream);
        boolean hasWhippedCream = whippedCreamCheckBox.isChecked();

        //add chocolate topping to the coffee order
        CheckBox chocolateCheckBox = findViewById(R.id.chocolate);
        boolean hasChocolate = chocolateCheckBox.isChecked();

        int price = calculatePrice(hasWhippedCream, hasChocolate);
        String priceMessage = createOrderSummary(name, price, hasWhippedCream, hasChocolate);

        Intent intent = new Intent(Intent.ACTION_SENDTO);
        intent.setData(Uri.parse("mailto:")); // only email apps should handle this
        intent.putExtra(Intent.EXTRA_SUBJECT, "Just Java order for : " + name);
        intent.putExtra(Intent.EXTRA_TEXT, priceMessage);

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

//        displayMessage(priceMessage);
    }

    /**
     * Calculates the price of the order.
     *
     * @param addWhippedCream is whether the user wants to add whipped cream to coffee
     * @param addChocolate    is whether the user wants to add chocolate topping to coffee
     * @return the total price.
     */
    private int calculatePrice(boolean addWhippedCream, boolean addChocolate) {
        //price of one cup of coffee
        int basePrice = 5;
        //adds $1 if user wants whipped cream
        if (addWhippedCream) {
            basePrice += 1;
        }
        //adds $2 if user wants chocolate topping
        if (addChocolate) {
            basePrice += 2;
        }
        //Calculate the total order price by multiplying basePrice by quantity
        return quantity * basePrice;
    }

    /**
     * Create summary of the order.
     *
     * @param name            of the user
     * @param price           of the order
     * @param addWhippedCream is whether or not the user wants whipped cream topping
     * @param addChocolate    is whether or not the user wants chocolate topping
     * @return text summary
     */

    private String createOrderSummary(String name, int price, boolean addWhippedCream, boolean addChocolate) {
        String priceMessage = getString(R.string.order_summary_name, name);
        priceMessage += "\n" + getString(R.string.order_summary_whipped_cream, addWhippedCream);
        priceMessage += "\n" + getString(R.string.order_summary_chocolate, addChocolate);
        priceMessage += "\n" + getString(R.string.order_summary_quantity, quantity);
        priceMessage += "\n" + getString(R.string.order_summary_price, NumberFormat.getCurrencyInstance().format(price));
        priceMessage += "\n" + getString(R.string.thank_you);
        return priceMessage;
    }

    /**
     * This method displays the given quantity value on the screen.
     */
    private void displayQuantity(int number) {
        TextView quantityTextView = findViewById(R.id.quantity_text_view);
        quantityTextView.setText("" + number);
    }

//    /**
//     * 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);
//    }
}