Android for Beginners : Spanish Localization Solution. This would be saved in the res/values-es/strings.xml file.

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
    <!-- Title for the application. [CHAR LIMIT=12] -->
    <string name="app_name">Sólo Java</string>

    <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
    <string name="name">Nombre</string>

    <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
    <string name="toppings">Ingredientes</string>

    <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
    <string name="whipped_cream">Crema batida</string>

    <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
    <string name="chocolate">Chocolate</string>

    <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
    <string name="quantity">Cantidad</string>

    <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=5] -->
    <string name="initial_quantity_value">2</string>

    <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
    <string name="order">Ordenar</string>

    <!--
      Name for the order summary. It will be shown in the format of "Name: Amy" where Amy is the
      user's name. [CHAR LIMIT=NONE]
    -->
    <string name="order_summary_name">Nombre: <xliff:g id="name" example="Amy">%s</xliff:g></string>

    <!--
      Whipped cream topping for the order summary. It will be shown in the format of
      "Add whipped cream? true" or "Add whipped cream? false". [CHAR LIMIT=NONE]
    -->
    <string name="order_summary_whipped_cream">Agregue la crema batida? <xliff:g id="addWhippedCream" example="true">%b</xliff:g></string>

    <!--
      Chocolate topping for the order summary. It will be shown in the format of
      "Add chocolate? true" or "Add chocolate? false". [CHAR LIMIT=NONE]
    -->
    <string name="order_summary_chocolate">Agregue el chocolate? <xliff:g id="addChocolate" example="true">%b</xliff:g></string>

    <!--
      Quantity of coffee cups for the order summary. It will be shown in the format of
      "Quantity: 2", where 2 is the number of cups ordered. [CHAR LIMIT=NONE]
    -->
    <string name="order_summary_quantity">Cantidad: <xliff:g id="quantity" example="2">%d</xliff:g></string>

    <!--
      Total price for the order summary. It will be shown in the format of
      "Total: $10" where $10 is the price. [CHAR LIMIT=NONE]
    -->
    <string name="order_summary_price">Total: <xliff:g id="price" example="$10">%s</xliff:g></string>

    <!-- Thank you message for the order summary. [CHAR LIMIT=NONE] -->
    <string name="thank_you">¡Gracias!</string>

    <!--
      Subject line for the order summary email. It will be in the format of
      "Just Java order for Amy" where Amy is the user's name. [CHAR LIMIT=NONE]
    -->
    <string name="order_summary_email_subject">Sólo java para <xliff:g id="name" example="Amy">%s</xliff:g></string>
</resources>

Arabic Version
النسخة العربية

الجافا فقط

<!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
<string name="name">الأسم</string>

<!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
<string name="toppings">إضافات</string>

<!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
<string name="whipped_cream">كريمه</string>

<!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
<string name="chocolate">شوكولاتة</string>

<!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
<string name="quantity">الكميه</string>

<!-- Hint text display in the empty field for the user's name [CHAR LIMIT=5] -->
<string name="initial_quantity_value">٢</string>

<!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] -->
<string name="order">أطلب</string>

<!--
  Name for the order summary. It will be shown in the format of "Name: Amy" where Amy is the
  user's name. [CHAR LIMIT=NONE]
-->
<string name="order_summary_name">: الأسم<xliff:g id="name" example="Amy">%s</xliff:g></string>

<!--
  Whipped cream topping for the order summary. It will be shown in the format of
  "Add whipped cream? true" or "Add whipped cream? false". [CHAR LIMIT=NONE]
-->
<string name="order_summary_whipped_cream">إضافة كريمه ؟ <xliff:g id="addWhippedCream" example="true">%b</xliff:g></string>

<!--
  Chocolate topping for the order summary. It will be shown in the format of
  "Add chocolate? true" or "Add chocolate? false". [CHAR LIMIT=NONE]
-->
<string name="order_summary_chocolate">إضافة شوكولاتة؟<xliff:g id="addChocolate" example="true">%b</xliff:g></string>

<!--
  Quantity of coffee cups for the order summary. It will be shown in the format of
  "Quantity: 2", where 2 is the number of cups ordered. [CHAR LIMIT=NONE]
-->
<string name="order_summary_quantity">: الكميه<xliff:g id="quantity" example="2">%d</xliff:g></string>

<!--
  Total price for the order summary. It will be shown in the format of
  "Total: $10" where $10 is the price. [CHAR LIMIT=NONE]
-->
<string name="order_summary_price">:الأجمالى <xliff:g id="price" example="$10">%s</xliff:g></string>

<!-- Thank you message for the order summary. [CHAR LIMIT=NONE] -->
<string name="thank_you">شكراَ</string>

<!--
  Subject line for the order summary email. It will be in the format of
  "Just Java order for Amy" where Amy is the user's name. [CHAR LIMIT=NONE]
-->
<string name="order_summary_email_subject"> الجافا فقط إلى <xliff:g id="name" example="Amy">%s</xliff:g></string>

السلام عليكم
ممكن توضيح لx liff ؟ للغة العربية

Turkish Translation

Sadece Java Topingler Teşekkürler Krem şanti Çikolata Miktar Emir İsim: %s Miktar: %s Çırpılmış krema ekler misiniz? %s Çikolata ekle?? %s Toplam: ₺%f İsim iki Sadece Java Siparişi

For the strings that use booleans variables, I did two types of strings for the true and false. For order_summary_whipped_cream and order_summary_chocolate I got rid of the xliff:g and used this code:
English

<!--
    Whipped cream topping for the order summary. It will be shown in the format of
    "Add whipped cream? true" or "Add whipped cream? false". [CHAR LIMIT=NONE]
-->
<string name="order_summary_whipped_cream_true">Add whipped cream? true</string>
<string name="order_summary_whipped_cream_false">Add whipped cream? false</string>

<!--
    Chocolate topping for the order summary. It will be shown in the format of
    "Add chocolate? true" or "Add chocolate? false". [CHAR LIMIT=NONE]
-->
<string name="order_summary_chocolate_true">Add chocolate? true</string>
<string name="order_summary_chocolate_false">Add chocolate? false</string>

`Spanish

<!--
    Whipped cream topping for the order summary. It will be shown in the format of
    "Add whipped cream? true" or "Add whipped cream? false". [CHAR LIMIT=NONE]
-->
<string name="order_summary_whipped_cream_true">Agregue la crema batida? verdadero</string>
<string name="order_summary_whipped_cream_false">Agregue la crema batida? falso</string>

<!--
    Chocolate topping for the order summary. It will be shown in the format of
    "Add chocolate? true" or "Add chocolate? false". [CHAR LIMIT=NONE]
-->
<string name="order_summary_chocolate_true">Agregue el chocolate? verdadero</string>
<string name="order_summary_chocolate_false">Agregue el chocolate? falso</string>

Then in the java file, I used the conditional operator, ?:, to set the values.to the boolean variables.

Hindi Version

 <?xml version="1.0" encoding="utf-8"?>
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
    <string name="app_name">JavaActivity</string>
    <string name="chocolate">चॉकलेट</string>
    <string name="whipped_cream">मार पड़ी क्रीम</string>
    <string name="order">आदेश</string>
    <string name="toppings">सामग्री</string>
    <string name="order_summary">आदेश सारांश</string>
    <string name="quantity">"परिमाण: "</string>
    <string name="thank_you">धन्यवाद!!</string>
    <string name="Whipped_Cream">"व्हीप्ड क्रीम जोड़ें? "</string>
    <string name="Chocolate">"चॉकलेट जोड़ें? "</string>
    <string name="name_text">" नाम: <xliff:g example="Amy" id="name">%s</xliff:g>"</string>
    <string name="total">"कुल: "</string>
    <string name="name">नाम</string>
</resources>

اسم التطبيق الاضافات شكرا لكم معلومات الطلب اكمل $0 اضف كريمة ? %b أضف شكولاته؟ القيمه %d المجموع%s

<string name="order_summary_name"> الاسم<xliff:g id="quantity" example="Yazan">%s</xliff:g></string>

Java>>>>
package com.example.justjava;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

/**

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

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

  • This method is called when the plus button is clicked. Intent intent = new Intent(Intent.ACTION_SENDTO);

  •     intent.setData(Uri.parse("mailto:")); // only email apps should handle this
    

  •     intent.putExtra(Intent.EXTRA_SUBJECT, "just jvaa" + editable);
    

  •     if (intent.resolveActivity(getPackageManager()) != null) {
    

  •         startActivity(intent);
    

  •     }
    

  */
  public void increment(View view) {

   if (quantity==15){
  
       Toast.makeText(this, " you cannot have more than 15  ", Toast.LENGTH_SHORT).show();
       return;
   }
   quantity=++quantity;
   displayQuantity(quantity);
  

  }
  /**

  • This method is called when the sub button is clicked.
    /
    public void decrement(View view) {
    if (quantity<1){
    Toast.makeText(this, "you cannot have less 1 cup", Toast.LENGTH_SHORT).show();
    return;
    }
    quantity=--quantity;
    displayQuantity(quantity);
    }
    /*

  • This method is called when the order button is clicked.
    */
    @SuppressLint("QueryPermissionsNeeded")
    public void submitOrder(View view) {
    EditText name = (EditText) findViewById(R.id.EditText_view);
    String Name = name.getText().toString(); // Editable Name = editText.getText();

    CheckBox isCheck = (CheckBox) findViewById(R.id.checkbox);
    boolean hasWhippedCream = isCheck.isChecked();

    CheckBox ischocolate = (CheckBox) findViewById(R.id.chocolate_checkbox);
    boolean hasChocolate = ischocolate.isChecked();

    int price = calculatePrice(hasWhippedCream, hasChocolate);
    String priceMassage = CsreateOrderSummary(price, hasWhippedCream, hasChocolate, Name);

    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, priceMassage);
    startActivity(intent);

     displayMessage(priceMassage);
    

  }

  private void displayQuantity(int number) {
  TextView quantityTextView = findViewById(R.id.quantity_text_view); // num of cups
  quantityTextView.setText("" + number);
  }

  /**

  • This method displays the given text on the screen.
    */
    private void displayMessage(String message) {
    TextView priceTextView = (TextView) findViewById(R.id.summary_order_text_view); // string
    priceTextView.setText(message);
    }

  /**

  • Calculate thr taxes of Saudi Arabia \if (hasWhippedCream || hasChocolate){

  •         price = calculatePrice() + 5 ;
    

  •     } if (hasWhippedCream  && hasChocolate){
    

  •         price = calculatePrice() + 10;
    

  •     } else if(hasChocolate|| hasWhippedCream){
    

  •         Toast.makeText(this, "have you add Toppings ", Toast.LENGTH_SHORT).show();
    

  • @return the value of taxes
    /
    private int calculatePrice( boolean addWhippedCream ,boolean addChocolate ) {
    int price = 5;
    if (addWhippedCream){
    price = price +1; }
    if (addChocolate){
    price = price+2; }
    return quantityprice;

  }
  /**
  * Create summary of the order.

•   * @param name of the customer
  

• @param price of the order

• @param addWhippedCream is whether or not the user wants whipped cream topping

• @param hasChoco is whether or not the user wants chocolate topping
  * @return text summary
  */
  private String CsreateOrderSummary (int price , boolean addWhippedCream,boolean hasChoco,String name ) {

   String priceMessage = getString(R.string.order_summary_name)+ name+":";
   priceMessage += "\n" +getString(R.string.add_whipped) + "?"+addWhippedCream;
   priceMessage += "\n"+getString(R.string.add_chocolat) + "?"+ hasChoco;
    priceMessage +=    quantity+"\n"+getString(R.string.quantity) ;
   priceMessage += "\n"+getString(R.string.Total) + price;
   priceMessage += "\n"+ getString(R.string.thank_you);
  
  
   return priceMessage;
  

  }
  }