JustJava MainActivity.java

MainActivity.java

package com.shunzhang.justjava;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
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 {

    private  int quantity = 2;
    private  int pricePreCupOfCoffee = 5;
    private  int numOfCoffeeMax = 100;
    private  int numOfCoffeeMin = 1;

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

    /**
     * This method is use for init the global var
     */
    public void initVar() {
        quantity = Integer.parseInt(getResources().getString(R.string.quantity_of_coffee));
        pricePreCupOfCoffee = Integer.parseInt(getResources().getString(R.string.quantity_pre_coffee));
    }

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

        // Figure out if the user wants whipped cream topping
        CheckBox whippedCreamCheckBox = (CheckBox) findViewById(R.id.whipped_cream_checkbox);
        boolean hasWhippedCream = whippedCreamCheckBox .isChecked();
        Log.v("MainActivity", "Has whipped cream: " + hasWhippedCream);

         // Figure out if the user wants chocolate topping
        CheckBox chocolateCheckBox = (CheckBox) findViewById(R.id.chocolate_checkbox);
        boolean hasChocolate = chocolateCheckBox.isChecked();
        Log.v("MainActivity", "Has chocolate: " + hasChocolate);

        int price = calculatePrice(quantity, pricePreCupOfCoffee, hasWhippedCream, hasChocolate);
        //displayMessage(createOrderSummary(name, price, 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);
        }
    }

    /**
     * Open map app on Android device
     * @param view
     */
    public void openMap(View view) {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setData(Uri.parse("geo:47.6, -122.3"));
        if (intent.resolveActivity(getPackageManager()) != null) {
            startActivity(intent);
        }
    }

    /**
     * Create summary of the order.
     *
     * @param name of user
     * @param price of the order.
     * @param hasWhippedCream
     * @param hasChocolate
     * @return text summary
     */
    private String createOrderSummary(String name, int price, boolean hasWhippedCream, boolean hasChocolate) {
        String priceMessage = "Name: " + name;
        priceMessage = priceMessage + "\nAdd whipped cream? " + hasWhippedCream;
        priceMessage = priceMessage + "\nAdd chocolate? " + hasChocolate;
        priceMessage = priceMessage + "\nQuantity: " + quantity;
        priceMessage = priceMessage + "\nTotal: $" + price;
        priceMessage = priceMessage + "\nThank You!!";
        return priceMessage;
    }

    /**
     * Calculates the price of the order.
     *
     * @param quantity is the number of cups of coffee ordered
     * @param pricePerCup is the price of one cup of coffee
     * @param hasWhippedCream is whether or not the user wants whipped cream topping
     * @param hasChocolate is whether or not the user wants chocolate topping
     * @return total price
     */
    private int calculatePrice(int quantity, int pricePerCup, boolean hasWhippedCream, boolean hasChocolate) {
        // Price of 1 cup of coffee
        int basePrice = pricePerCup;

        // Add $1 if the user wants whipped cream
        if (hasWhippedCream) {
            basePrice = basePrice + 1;
        }

        // Add $2 if the user wants chocolate
        if (hasChocolate) {
            basePrice = basePrice + 2;
        }
        int price = quantity * basePrice;
        return price;
    }

    /**
     * This method is called when the plus button is clicked.
     */
    public void increment(View view) {
        quantity = quantity + 1;
        if (quantity > numOfCoffeeMax) {
            // Show an error message as a toast
            Toast.makeText(this, "You cannot have more than 100 coffees", Toast.LENGTH_SHORT).show();
            // Exit this method early because there's nothing left to do
            return;
        }
        display(quantity);
    }

    /**
     * This method is called when the minus button is clicked.
     */
    public void decrement(View view) {
        quantity = quantity - 1;
        if (quantity < numOfCoffeeMin) {
            // Show an error message as a toast
            Toast.makeText(this, "You cannot have less than 1 coffees", Toast.LENGTH_SHORT).show();
            // Exit this method early because there's nothing left to do
            return;
        }
        display(quantity);
    }

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

    /**
     * This method displyas the given text on the screen.
     * @param message
     */
    private void displayMessage(String message) {
        TextView orderSummaryTextView = (TextView) findViewById(R.id.order_summary_text_view);
        orderSummaryTextView.setText(message);
    }
}