Nullpointexception студия Android на Java

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Below are my MainActivity and Layout file for Android calculator app.
Everytime I run the app , it crashes and inside the LOGCAT of android studio, the exception occurs.
LOGCAT MESSAGE BELOW :

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference



MainActivity Code Below :

package com.hfad.calculatorx;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        setAllListners();

    }

    //Referencing all components
    TextView Display =(TextView) findViewById(R.id.Display);
    Button button0 =(Button) findViewById(R.id.button0);
    Button button1 =(Button)findViewById(R.id.button1);
    Button button2 =(Button)findViewById(R.id.button2);
    Button button3 =(Button)findViewById(R.id.button3);
    Button button4 =(Button)findViewById(R.id.button4);
    Button button5 =(Button)findViewById(R.id.button5);
    Button button6 =(Button)findViewById(R.id.button6);
    Button button7 =(Button)findViewById(R.id.button7);
    Button button8 =(Button)findViewById(R.id.button8);
    Button button9 =(Button)findViewById(R.id.button9);
    Button buttonClear =(Button)findViewById(R.id.buttonclear);
    Button buttonResult =(Button)findViewById(R.id.buttonresult);


    //Making OnclickListners for all Buttons

    View.OnClickListener Button0Listner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Display.append(Display.getText()+"0");
        }
    };


    View.OnClickListener Button1Listner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Display.append(Display.getText()+"1");
        }
    };

    View.OnClickListener Button2Listner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Display.append(Display.getText()+"2");
        }
    };

    View.OnClickListener Button3Listner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Display.append(Display.getText()+"3");
        }
    };


    View.OnClickListener Button4Listner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Display.append(Display.getText()+"4");
        }
    };

    View.OnClickListener Button5Listner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Display.append(Display.getText()+"5");
        }
    };

    View.OnClickListener Button6Listner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Display.append(Display.getText()+"6");
        }
    };

    View.OnClickListener Button7Listner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Display.append(Display.getText()+"7");
        }
    };

    View.OnClickListener Button8Listner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Display.append(Display.getText()+"8");
        }
    };

    View.OnClickListener Button9Listner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Display.append(Display.getText()+"9");
        }
    };


    View.OnClickListener ButtonClearListner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Display.setText("");
        }
    };


    View.OnClickListener ButtonResultListner = new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            //Part left empty intentionally

        }
    };

    //Setting all listners at once

    public void setAllListners(){
        button0.setOnClickListener(Button0Listner);
        button1.setOnClickListener(Button1Listner);
        button2.setOnClickListener(Button2Listner);
        button3.setOnClickListener(Button3Listner);
        button4.setOnClickListener(Button4Listner);
        button5.setOnClickListener(Button5Listner);
        button6.setOnClickListener(Button6Listner);
        button7.setOnClickListener(Button7Listner);
        button8.setOnClickListener(Button8Listner);
        button9.setOnClickListener(Button9Listner);
        buttonClear.setOnClickListener(ButtonClearListner);
        buttonResult.setOnClickListener(ButtonResultListner);
    }

}



Layout File Below :

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <TextView
        android:id="@+id/Display"
        android:layout_width="395dp"
        android:layout_height="80dp"
        android:layout_marginTop="60dp"
        android:background="@color/display_background"
        android:gravity="center_horizontal|bottom"
        android:textColor="@color/black"
        android:textSize="25dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.529"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:textSize="25sp"
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="36dp"
        android:layout_marginLeft="36dp"
        android:layout_marginBottom="48dp"
        android:text="1"
        app:layout_constraintBottom_toTopOf="@+id/button3"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:textSize="25sp"
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="44dp"
        android:text="2"
        app:layout_constraintBottom_toTopOf="@+id/button4"
        app:layout_constraintEnd_toStartOf="@+id/buttonadd"
        app:layout_constraintStart_toEndOf="@+id/button1" />

    <Button
        android:id="@+id/buttonadd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="36dp"
        android:layout_marginRight="36dp"
        android:layout_marginBottom="52dp"
        android:text="+"
        android:textSize="25sp"
        app:layout_constraintBottom_toTopOf="@+id/buttonsubtract"
        app:layout_constraintEnd_toEndOf="parent" />

    <Button
        android:textSize="25sp"
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="36dp"
        android:layout_marginLeft="36dp"
        android:layout_marginBottom="36dp"
        android:text="3"
        app:layout_constraintBottom_toTopOf="@+id/button5"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:textSize="25sp"
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="40dp"
        android:text="4"
        app:layout_constraintBottom_toTopOf="@+id/button6"
        app:layout_constraintEnd_toStartOf="@+id/buttonsubtract"
        app:layout_constraintStart_toEndOf="@+id/button3" />

    <Button
        android:textSize="25sp"
        android:id="@+id/buttonsubtract"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="36dp"
        android:layout_marginRight="36dp"
        android:layout_marginBottom="40dp"
        android:text="-"
        app:layout_constraintBottom_toTopOf="@+id/buttondivide"
        app:layout_constraintEnd_toEndOf="parent" />

    <Button
        android:textSize="25sp"
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="36dp"
        android:layout_marginLeft="36dp"
        android:layout_marginBottom="40dp"
        android:text="5"
        app:layout_constraintBottom_toTopOf="@+id/button8"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:textSize="25sp"
        android:id="@+id/button6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="40dp"
        android:text="6"
        app:layout_constraintBottom_toTopOf="@+id/button8"
        app:layout_constraintEnd_toStartOf="@+id/buttondivide"
        app:layout_constraintStart_toEndOf="@+id/button5" />

    <Button
        android:textSize="25sp"
        android:id="@+id/buttondivide"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="36dp"
        android:layout_marginRight="36dp"
        android:layout_marginBottom="40dp"
        android:text="/"
        app:layout_constraintBottom_toTopOf="@+id/buttonmultiply"
        app:layout_constraintEnd_toEndOf="parent" />

    <Button
        android:textSize="25sp"
        android:id="@+id/button7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="36dp"
        android:layout_marginLeft="36dp"
        android:layout_marginTop="40dp"
        android:text="7"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button5" />

    <Button
        android:textSize="25sp"
        android:id="@+id/button8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="40dp"
        android:text="8"
        app:layout_constraintBottom_toTopOf="@+id/button0"
        app:layout_constraintEnd_toStartOf="@+id/buttonmultiply"
        app:layout_constraintStart_toEndOf="@+id/button7" />

    <Button
        android:textSize="25sp"
        android:id="@+id/buttonmultiply"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="36dp"
        android:layout_marginRight="36dp"
        android:layout_marginBottom="36dp"
        android:text="*"
        app:layout_constraintBottom_toTopOf="@+id/buttonclear"
        app:layout_constraintEnd_toEndOf="parent" />

    <Button
        android:textSize="25sp"
        android:id="@+id/button9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="36dp"
        android:layout_marginLeft="36dp"
        android:layout_marginTop="40dp"
        android:text="9"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button7"
        app:layout_constraintVertical_bias="0.007" />

    <Button
        android:textSize="25sp"
        android:id="@+id/button0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="32dp"
        android:text="0"
        app:layout_constraintBottom_toTopOf="@+id/buttonresult"
        app:layout_constraintEnd_toStartOf="@+id/buttonclear"
        app:layout_constraintHorizontal_bias="0.506"
        app:layout_constraintStart_toEndOf="@+id/button9" />

    <Button
        android:textSize="22sp"
        android:id="@+id/buttonclear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="36dp"
        android:layout_marginRight="36dp"
        android:layout_marginBottom="128dp"
        android:text="Clear"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

    <Button
        android:textSize="22sp"
        android:id="@+id/buttonresult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="48dp"
        android:text="Result"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.501"
        app:layout_constraintStart_toStartOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

Что я уже пробовал:

Я пробовал играть с этими методами, но ничего не вышло

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