MainActivity.java

package com.example.android.justjava;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.TextView;

import java.text.NumberFormat;

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

    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;
        display(quantity);
    }

    /**
     * This method is called when the minus button is clicked.
     */
    public void decrement(View view) {
        quantity = quantity - 1;
        display(quantity);
    }

    /**
     * This method is called when the order button is clicked.
     */
    public void submitOrder(View view) {
        int quantity = 5;
        display(quantity);
        displayPrice(quantity * 5);
    }

    /**
     * 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 value on the screen.
     */
    private void displayPrice(int number) {
        TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
        priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
    }

}

// My code

package com.example.android.justjava;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;

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 order button is clicked.
    */
    public void submitOrder(View view) {
    display(quantity);
    displayPrice(quantity * 5);
    }

  /**

  • This method is called when the plus (+) button is clicked.
    */
    public void increment(View view) {
    quantity++;
    display(quantity);
    //displayPrice(quantity * 5); //for auto-updating the total price.
    }

  /**

  • This method is called when the minus (-) button is clicked.
    */
    public void decrement(View view) {

  /* quantity--; //quantity value may go in negative, have to correct it
  display(quantity);
  displayPrice((quantity) * 5); //for auto-updating the total price.
  */

   /** Here is the fix for negative value */
   if (quantity == 0) {
       return;
   } else {
       quantity--;
       display(quantity);
       //displayPrice(quantity * 5); //for auto-updating the total price.
   }
  

  }

  /**

  • 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));
    }

}

My version of the project is here.

i thought that the code is supposed to be in kotlin.

12-13 05:37:15.373 3280-3280/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.justjava, PID: 3280
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:390)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385)
at android.view.View.performClick(View.java:4780) 
at android.view.View$PerformClick.run(View.java:19866) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5254) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x1
at android.content.res.Resources.getText(Resources.java:299)
at android.widget.TextView.setText(TextView.java:4132)

help needed

@abdulshak
try to change import android.support.v7.app.ActionBarActivity; to
this import androidx.appcompat.app.AppCompatActivity;

and change this public class MainActivity extends ActionBarActivity {
to this public class MainActivity extends AppCompatActivity {

UPDATE

`package com.example.justjava;

import androidx.appcompat.app.AppCompatActivity;

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

import java.text.NumberFormat;
import java.util.Locale;

/**

• 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;
    display(quantity);
    }

  /**

  • This method is called when the minus button is clicked.
    */
    public void decrement(View view) {
    quantity = quantity - 1;
    display(quantity);
    }

  /**

  • This method is called when the order button is clicked.
    */
    public void submitOrder(View view) {
    int quantity = 5;
    display(quantity);
    displayPrice(quantity * 10);
    }

  /**

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

  /**

  • This method displays the given price value on the screen.
    */
    private void displayPrice(int number) {
    TextView priceTextView = findViewById(R.id.price_text_view);
    priceTextView.setText(NumberFormat.getCurrencyInstance(new Locale("en", "US")).format(number));
    }
    }
    `

MAIN ACTIVITY.JAVA
package com.example.android.justjava;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import java.text.NumberFormat;

public class MainActivity extends AppCompatActivity {
int n;
EditText editText;
TextView quantityTextView ;
@OverRide
protected void onCreate(@nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText = findViewById(R.id.editTxt);
quantityTextView = findViewById(R.id.quantity_text_view);
}
public void acceptQuantity(View view){
int number;
Button btn = (Button) findViewById(R.id.accept);
btn.setOnClickListener(new View.OnClickListener() {
@OverRide
public void onClick(View v) {
int number = Integer.parseInt(editText.getText().toString());
n=number;
// ++number;
quantityTextView.setText("" + n);
// displayPrice(number*2);
}
});
}

public void incrementOrder(View view){
    int number;
    Button btn = (Button) findViewById(R.id.incr);
    btn.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {

            ++n;
            quantityTextView.setText("" + n);
        }
    });
}
public void decrementOrder(View view){
    int number;
    Button btn = (Button) findViewById(R.id.dcr);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            --n;
            quantityTextView.setText("" + n);
        }
        });
    }

public void submitOrder(View view) {
    int number;
    Button btn = (Button) findViewById(R.id.button);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            displayPrice(n*2);
            editText.setText(""+n);
        }
    });    }

public void displayPrice(int number) {
    TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
    priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
}

}

FOR THE ABOVE JAVA CODE

package com.example.android.justjava;

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;

import java.text.NumberFormat;

/**

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

  @OverRide
  protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  }
  int quantity = 2;
  /**

  • When you click the + it increases the initial value to 3
    */
    public void incrementOrder(View view) {
    quantity = quantity + 1;
    display(quantity);

  }
  /** When you click the - button it changes to 1 */
  public void decrementOrder(View view) {
  if (quantity==0){
  quantity = 0;
  }else {
  quantity = quantity - 1;
  display(quantity);
  }
  }

  /**

  • This method is called when the order button is clicked.
    */
    public void submitOrder(View view) {
    int quantity = 2;
    display(quantity);
    displayPrice(quantity * 5);
    }

  /**

  • 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));
    }

}

You can also use the displayPrice() method in increment() and decrement() so that when you increase the quantity it increases the price as well.
Use the image above if you have any doubts.

I copied this xml and I had 7 errors

Why this XML have errors

ActionBarActivity is now deprecated, update it to AppCompatActivity for the students.

yes absolutely right...

/*
package com.example.justjava;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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

}
/
/*

• IMPORTANT: Make sure you are using the correct package name.
• This example uses the package name:
• package com.example.android.justjava
• If you get an error when copying this code into Android studio, update it to match teh package name found
• in the project's AndroidManifest.xml file.
  **/

package com.example.justjava;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.text.NumberFormat;

//import android.support.v7.app.AppCompatActivity;

/**

• This app displays an order form to order coffee.
  */
  public class MainActivity extends AppCompatActivity {
  //global variable
  int quantity = 3;

  @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) {

    display(quantity);
    displayPrice(quantity*5);
    }
    /**

  • This method is called when the order button is clicked.
    */
    public void increment(View view ) {

    quantity=quantity+1;
    display(quantity);

  }
  /**

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

}

task #2= lesson 20
/*
package com.example.justjava;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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

}
/
/*

• IMPORTANT: Make sure you are using the correct package name.
• This example uses the package name:
• package com.example.android.justjava
• If you get an error when copying this code into Android studio, update it to match teh package name found
• in the project's AndroidManifest.xml file.
  **/

package com.example.justjava;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.text.NumberFormat;

//import android.support.v7.app.AppCompatActivity;

/**

• This app displays an order form to order coffee.
  */
  public class MainActivity extends AppCompatActivity {
  //global variable
  int quantity = 0;

  @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) {

    display(quantity);
    displayPrice(quantity*5);
    }
    /**

  • This method is called when the order button is clicked.
    */
    public void increment(View view ) {
    quantity=quantity+1;
    display(quantity);

  }
  /**

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

}

task 3: lesson 20
/*
package com.example.justjava;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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

}
/
/*

• IMPORTANT: Make sure you are using the correct package name.
• This example uses the package name:
• package com.example.android.justjava
• If you get an error when copying this code into Android studio, update it to match teh package name found
• in the project's AndroidManifest.xml file.
  **/

package com.example.justjava;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.text.NumberFormat;

//import android.support.v7.app.AppCompatActivity;

/**

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

    display(quantity);
    displayPrice(quantity*5);
    }
    /**

  • This method is called when the order button is clicked.
    /
    public void increment(View view ) {
    //quantity=quantity+1;
    quantity=quantity2;
    display(quantity);

  }
  /**

  • This method is called when the order button is clicked.
    */
    public void decrement(View view ) {
    //quantity=quantity-1;
    quantity=quantity/2;
    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));
    }

}

/*
package com.example.justjava;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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

}
/
/*

• IMPORTANT: Make sure you are using the correct package name.
• This example uses the package name:
• package com.example.android.justjava
• If you get an error when copying this code into Android studio, update it to match teh package name found
• in the project's AndroidManifest.xml file.
  **/

package com.example.justjava;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.text.NumberFormat;

//import android.support.v7.app.AppCompatActivity;

/**

• This app displays an order form to order coffee.
  */
  public class MainActivity extends AppCompatActivity {
  //global variable
  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) {
    int quantity=5;
    display(quantity);
    displayPrice(quantity5);
    }
    /**
  • This method is called when the order button is clicked.
    /
    public void increment(View view ) {
    //quantity=quantity+1;
    quantity=quantity2;
    display(quantity);

  }
  /**

  • This method is called when the order button is clicked.
    */
    public void decrement(View view ) {
    //quantity=quantity-1;
    quantity=quantity/2;
    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));
    }

}

this code is the content of mainActivity.java. it it has the global variable for increment() and decrement() methods and the local variable for the submitOrder(View view) method(i.e., with the 3 tasks):
/*
package com.example.justjava;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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

}
/
/*

• IMPORTANT: Make sure you are using the correct package name.
• This example uses the package name:
• package com.example.android.justjava
• If you get an error when copying this code into Android studio, update it to match teh package name found
• in the project's AndroidManifest.xml file.
  **/

package com.example.justjava;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.text.NumberFormat;

//import android.support.v7.app.AppCompatActivity;

/**

• This app displays an order form to order coffee.
  */
  public class MainActivity extends AppCompatActivity {
  //global variable
  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) {
    int quantity=5;
    display(quantity);
    displayPrice(quantity5);
    }
    /**
  • This method is called when the order button is clicked.
    /
    public void increment(View view ) {
    //quantity=quantity+1;
    quantity=quantity2;
    display(quantity);

  }
  /**

  • This method is called when the order button is clicked.
    */
    public void decrement(View view ) {
    //quantity=quantity-1;
    quantity=quantity/2;
    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));
    }

}

this code is the content of mainActivity.java. it it has the global variable for increment() and decrement() methods and the local variable for the submitOrder(View view) method(i.e., with the 3 tasks):
/*
package com.example.justjava;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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

IMPORTANT: Make sure you are using the correct package name.
This example uses the package name:
package com.example.android.justjava
If you get an error when copying this code into Android studio, update it to match teh package name found
in the project's AndroidManifest.xml file.
**/
package com.example.justjava;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.text.NumberFormat;

//import android.support.v7.app.AppCompatActivity;

/**

This app displays an order form to order coffee.
*/
public class MainActivity extends AppCompatActivity {
//global variable
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) {
int quantity=5;
display(quantity);
displayPrice(quantity5);
}
/**
This method is called when the order button is clicked.
/
public void increment(View view ) {
//quantity=quantity+1;
quantity=quantity2;
display(quantity);
}
/**

This method is called when the order button is clicked.
*/
public void decrement(View view ) {
//quantity=quantity-1;
quantity=quantity/2;
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));
}
}

UPDATE

`package com.example.justjava;

import androidx.appcompat.app.AppCompatActivity;

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

import java.text.NumberFormat; import java.util.Locale;

/**

• 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;
    display(quantity);
    }

  /**

  • This method is called when the minus button is clicked.
    */
    public void decrement(View view) {
    quantity = quantity - 1;
    display(quantity);
    }

  /**

  • This method is called when the order button is clicked.
    */
    public void submitOrder(View view) {
    int quantity = 5;
    display(quantity);
    displayPrice(quantity * 10);
    }

  /**

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

  /**

  • This method displays the given price value on the screen.
    */
    private void displayPrice(int number) {
    TextView priceTextView = findViewById(R.id.price_text_view);
    priceTextView.setText(NumberFormat.getCurrencyInstance(new Locale("en", "US")).format(number));
    }
    }
    `

plz can u help me.. i send to u in email will u plz answer

hi i need help any one conntect me and help me in cod plz

add me on discord .... DzHafsa 1426

how did you get my e-mail? and can you define for our personality?

…

On Sat, Aug 6, 2022 at 9:11 PM hafsabelka ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ hi i need help any one conntect me and help me in cod plz — Reply to this email directly, view it on GitHub <https://gist.github.com/6dde8cc012ac94aaf9ea#gistcomment-4258189>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQXS6DV6E2O2IP4N3RYBG43VX2TGVANCNFSM4HG62DHQ> . You are receiving this because you commented.Message ID: ***@***.***>

Yes plz will u contacts me. My watssap is 213764376684 في الأحد، ٧ أغسطس ٢٠٢٢, ٥:١٨ ص Anwaar Gharaibeh ***@***.***> كتب:

…

***@***.**** commented on this gist. ------------------------------ how did you get my e-mail? and can you define for our personality? On Sat, Aug 6, 2022 at 9:11 PM hafsabelka ***@***.***> wrote: > ***@***.**** commented on this gist. > ------------------------------ > > hi i need help any one conntect me and help me in cod plz > > — > Reply to this email directly, view it on GitHub > <https://gist.github.com/6dde8cc012ac94aaf9ea#gistcomment-4258189>, or > unsubscribe > < https://github.com/notifications/unsubscribe-auth/AQXS6DV6E2O2IP4N3RYBG43VX2TGVANCNFSM4HG62DHQ > > . > You are receiving this because you commented.Message ID: > ***@***.***> > — Reply to this email directly, view it on GitHub <https://gist.github.com/6dde8cc012ac94aaf9ea#gistcomment-4258465>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AKVBFYE345XYM7CN35QHOWLVX42IJANCNFSM4HG62DHQ> . You are receiving this because you commented.Message ID: ***@***.***>

I really wanna learn. And im from algeria. Of course your email in your. Page في الأحد، ٧ أغسطس ٢٠٢٢, ٥:١٨ ص Anwaar Gharaibeh ***@***.***> كتب:

…

***@***.**** commented on this gist. ------------------------------ how did you get my e-mail? and can you define for our personality? On Sat, Aug 6, 2022 at 9:11 PM hafsabelka ***@***.***> wrote: > ***@***.**** commented on this gist. > ------------------------------ > > hi i need help any one conntect me and help me in cod plz > > — > Reply to this email directly, view it on GitHub > <https://gist.github.com/6dde8cc012ac94aaf9ea#gistcomment-4258189>, or > unsubscribe > < https://github.com/notifications/unsubscribe-auth/AQXS6DV6E2O2IP4N3RYBG43VX2TGVANCNFSM4HG62DHQ > > . > You are receiving this because you commented.Message ID: > ***@***.***> > — Reply to this email directly, view it on GitHub <https://gist.github.com/6dde8cc012ac94aaf9ea#gistcomment-4258465>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AKVBFYE345XYM7CN35QHOWLVX42IJANCNFSM4HG62DHQ> . You are receiving this because you commented.Message ID: ***@***.***>

Hi guys I need some help on Saving an app state when the process is killed or terminated. Anyone mind?

…

On Mon, Aug 8, 2022, 00:52 hafsabelka ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ I really wanna learn. And im from algeria. Of course your email in your. Page في الأحد، ٧ أغسطس ٢٠٢٢, ٥:١٨ ص Anwaar Gharaibeh ***@***.***> كتب: > ***@***.**** commented on this gist. > ------------------------------ > how did you get my e-mail? and can you define for our personality? > > On Sat, Aug 6, 2022 at 9:11 PM hafsabelka ***@***.***> wrote: > > > ***@***.**** commented on this gist. > > ------------------------------ > > > > hi i need help any one conntect me and help me in cod plz > > > > — > > Reply to this email directly, view it on GitHub > > <https://gist.github.com/6dde8cc012ac94aaf9ea#gistcomment-4258189>, or > > unsubscribe > > < > https://github.com/notifications/unsubscribe-auth/AQXS6DV6E2O2IP4N3RYBG43VX2TGVANCNFSM4HG62DHQ > > > > . > > You are receiving this because you commented.Message ID: > > ***@***.***> > > > > — > Reply to this email directly, view it on GitHub > <https://gist.github.com/6dde8cc012ac94aaf9ea#gistcomment-4258465>, or > unsubscribe > < https://github.com/notifications/unsubscribe-auth/AKVBFYE345XYM7CN35QHOWLVX42IJANCNFSM4HG62DHQ > > . > You are receiving this because you commented.Message ID: > ***@***.***> > — Reply to this email directly, view it on GitHub <https://gist.github.com/6dde8cc012ac94aaf9ea#gistcomment-4259013>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ANLEHFBNEALSMLU4MNQZGBDVYAV2VANCNFSM4HG62DHQ> . You are receiving this because you commented.Message ID: ***@***.***>

package com.example.justjava;

import android.R
import android.os.Bundle
import android.view.View
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import java.text.NumberFormat

/**

This app displays an order form to order coffee.
*/
class MainActivity : AppCompatActivity() {

var quantity = 0

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(com.example.justjava.R.layout.activity_main)
}

/**
 * This method is called when the PLUS button is clicked.
 */
fun increment (view: View?) {
    quantity = quantity + 1
    display(quantity)
}

/**
 * This method is called when the MINUS button is clicked.
 */
fun decrement (view: View?) {
    quantity = quantity - 1
    display(quantity)
}

/**
 * This method is called when the ORDER button is clicked.
 */
fun submitOrder(view: View?) {
    display(quantity)
    displayPrice(quantity * 50)
}

/**
 * This method displays the given quantity value on the screen.
 */
private fun display(number: Int) {
    val quantityTextView = findViewById<View>(com.example.justjava.R.id.quantity_text_view) as TextView
    quantityTextView.text = "" + number
}

/**
 * This method displays the given price on the screen.
 */
private fun displayPrice(number: Int) {
    val priceTextView = findViewById<View>(com.example.justjava.R.id.price_text_view) as TextView
    priceTextView.setText(NumberFormat.getCurrencyInstance().format(number))
}

}

CAN YOU PROVIDE ME THE XML CODE MY XML CODE HAS SOME ERROR