Create an android application named Arithmatic_ope which perform all basic arithmatic operation like addition, subtraction, multiplication and division, using Java in Android Studio.

Java Code:-

public class MainActivity extends AppCompatActivity {
    EditText n1,n2;
    Button add,sub,mul,div;
    TextView tv;

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

        n1=findViewById(R.id.number1);
        n2=findViewById(R.id.nummber2);

        add=findViewById(R.id.bt1);
        sub=findViewById(R.id.bt2);
        mul=findViewById(R.id.bt3);
        div=findViewById(R.id.bt4);

        tv=findViewById(R.id.textView);



        add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int num1 = Integer.parseInt(n1.getText().toString());
                int num2 = Integer.parseInt(n2.getText().toString());
                int sum = num1 + num2;
                tv.setText(String.valueOf(sum));
            }
        });


        sub.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int num1 = Integer.parseInt(n1.getText().toString());
                int num2 = Integer.parseInt(n2.getText().toString());
                int sub = num1 - num2;
                tv.setText(String.valueOf(sub));
            }
        });



        mul.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int num1 = Integer.parseInt(n1.getText().toString());
                int num2 = Integer.parseInt(n2.getText().toString());
                int mul = num1 * num2;
                tv.setText(String.valueOf(mul));
            }
        });


        div.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int num1 = Integer.parseInt(n1.getText().toString());
                int num2 = Integer.parseInt(n2.getText().toString());
                int div = num1 / num2;
                tv.setText(String.valueOf(div));
            }
        });
    }
}

XML Code:-

<?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">

    <EditText
        android:id="@+id/number1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="113dp"
        android:ems="10"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/nummber2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="55dp"
        android:ems="10"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="@+id/number1"
        app:layout_constraintStart_toStartOf="@+id/number1"
        app:layout_constraintTop_toBottomOf="@+id/number1" />

    <Button
        android:id="@+id/bt1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:text="+"
        app:layout_constraintBaseline_toBaselineOf="@+id/bt2"
        app:layout_constraintStart_toStartOf="@+id/bt3" />

    <Button
        android:id="@+id/bt2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="7dp"
        android:layout_marginBottom="34dp"
        android:text="-"
        app:layout_constraintBottom_toTopOf="@+id/bt4"
        app:layout_constraintEnd_toEndOf="@+id/bt4" />

    <Button
        android:id="@+id/bt3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="18dp"
        android:layout_marginTop="37dp"
        android:text="*"
        app:layout_constraintEnd_toStartOf="@+id/bt4"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/bt1" />

    <Button
        android:id="@+id/bt4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="1dp"
        android:layout_marginBottom="180dp"
        android:text="/"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/bt3"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="106dp"
        android:layout_height="0dp"
        android:layout_marginTop="287dp"
        android:layout_marginBottom="187dp"
        android:textAlignment="center"
        android:textColor="@color/black"
        android:textSize="20sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toTopOf="@+id/bt4"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>