Android for Beginners : Add the Chocolate Topping Checkbox Solution Java

MainActivity.java

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 chocolate 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);
    }

}

package com.example.myapplication;

import android.graphics.Color;
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 order button is clicked.
    */
    public void submitOrder(View view) {
    CheckBox whippercreamcheckbox = (CheckBox) findViewById(R.id.Whipped_Cream_checkbox);
    CheckBox chocolat = (CheckBox) findViewById(R.id.Whipped_Chocolat_checkbox);
    boolean hasWhpperCream = whippercreamcheckbox.isChecked();
    boolean haschocolat = chocolat.isChecked();

    calculatePrice(quantity);
    displayMessage(creatOrderSummary(hasWhpperCream, haschocolat));
    }

    private String creatOrderSummary(Boolean hasWhpperCream, Boolean haschocolat){
        int price = calculatePrice(quantity);
    
        String priceMessage  = "add whepperCream ? "+hasWhpperCream + "\nadd whepperChocolat ? "+haschocolat + "\nQuantity : "+quantity ;
        priceMessage = priceMessage + "\nTotal: $ " + price ;
        priceMessage = priceMessage + "\nThank you!";
    
             return priceMessage;
    }
    

  private int calculatePrice(int quantity){
  int price = quantity *5 ;
  return price ;
  }

  public void increment(View view) {
  quantity =quantity +1;
  display(quantity);
  }
  public void decrement(View view) {
  quantity=quantity -1;
  display(quantity);
  }

  /**

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

  private void displayMessage (String number) {
  int x = calculatePrice(quantity);

   TextView order_summaryTextView = (TextView) findViewById(R.id.order_summary_text_view);
   order_summaryTextView.setText("Name : Yassine Ouardini\n" + number);
   if (x > 50)
       order_summaryTextView.setTextColor(Color.RED);
   else
       order_summaryTextView.setTextColor(Color.BLACK);
   }
  

  }

I had to write this code, otherwise, when clicked on the checkbox I got the message JustJava has stopped. But in the code is not mentioned can someone explain, please?

`public void CheckBox(View view) {
boolean checked = ((CheckBox) view).isChecked();
}

public void CheckBox2(View view) {
    boolean checked = ((CheckBox) view).isChecked();
}`

This code also affect the price as per chocolatebox is checked or whippedCreamBox checked

`package com.o.just_java;

import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.TextView;

import java.text.NumberFormat;

import androidx.appcompat.app.AppCompatActivity;

/**

• This app displays an order form to order coffee.
  */
  public class MainActivity extends AppCompatActivity {

  int quantity= 0;
  int price = 5;
  int whippedCreamPrice=0;
  int chocolatePrice=0;

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

  /**

  • This method is called when the order button is clicked.
    */

  public void submitOrder(View view) {
  CheckBox whippedCreamCheckBox = (CheckBox) findViewById(R.id.whippedCreamCheckBox);
  boolean hasWhippedCream= whippedCreamCheckBox.isChecked();

   CheckBox chocolateBox = (CheckBox) findViewById(R.id.chocolateBox);
   boolean hasChocolate= chocolateBox.isChecked();
  
   if(hasWhippedCream == true)
       {
           whippedCreamPrice=2;
       }
       else {
       whippedCreamPrice=0;
       }
   if(hasChocolate ==  true) {
       chocolatePrice=3;
   }
   else {
       chocolatePrice=0;
   }
  
   String priceMessage= "Name: "+"Omesh kumar"+
           "\nQuantity: " +quantity+
           "\nwippedCream: " + hasWhippedCream +
           "\nChocolate: " + hasChocolate +
           "\nTotal $ "+ quantity* (price +whippedCreamPrice +chocolatePrice) +
           "\nThankyou";
   displayMessage(priceMessage);
   // displayPrice(quantity*5);
  

  }

  public void Increment(View view)
  {
  quantity= quantity + 1;
  display(quantity);
  }

  public void Decrement(View view)
  {
  quantity= quantity - 1;
  display(quantity);
  }

  /**

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

  /**

  • This method displays the given price on the screen.
    */
    private void displayPrice(int number) {
    TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
    priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
    }
    private void displayMessage(String message) {
    TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
    priceTextView.setText(message);
    }
    }`

Visit my github to see the code xP.
XML Code:
https://github.com/deepak9962/just-java/blob/master/app/src/main/res/layout/activity_main.xml

MainActivity:
https://github.com/deepak9962/just-java/blob/master/app/src/main/java/com/justjava/MainActivity.java

I did it using a different code, still worked :D ! thank you for the code tho !!