/*
Program to print the text “ExplicitIntent”.
Developed by:Bala Sathiesh CS
Registeration Number :212222040022
*/

package com.example.explicitintent;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    private EditText editTextNumber;
    private Button buttonFactorial;
    private Button buttonExplicit;

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

        editTextNumber = findViewById(R.id.editTextNumber);
        buttonFactorial = findViewById(R.id.buttonFactorial);
        buttonExplicit = findViewById(R.id.buttonExplicit);

        buttonFactorial.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                calculateFactorial();
            }
        });

        buttonExplicit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openSecondActivity();
            }
        });
    }

    private void calculateFactorial() {
        int number = Integer.parseInt(editTextNumber.getText().toString());
        int factorial = 1;
        for (int i = 1; i <= number; i++) {
            factorial *= i;
        }
        openSecondActivityWithFactorial(factorial);
    }

    private void openSecondActivityWithFactorial(int factorial) {
        Intent intent = new Intent(this, SecondActivity.class);
        intent.putExtra("factorial", factorial);
        startActivity(intent);
    }

    private void openSecondActivity() {
        Intent intent = new Intent(this, SecondActivity.class);
        startActivity(intent);
    }
}

package com.example.explicitintent;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.TextView;

public class SecondActivity extends AppCompatActivity {

    private TextView textViewResult;

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

        textViewResult = findViewById(R.id.textViewResult);

        Bundle extras = getIntent().getExtras();
        if (extras != null && extras.containsKey("factorial")) {
            int factorial = extras.getInt("factorial");
            textViewResult.setText("Factorial: " + factorial);
        } else {
            textViewResult.setText("Factorial not calculated");
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/editTextNumber"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="Enter a number"
        android:inputType="number"/>

    <Button
        android:id="@+id/buttonFactorial"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Calculate Factorial"
        app:icon="@android:drawable/star_big_on" />

    <Button
        android:id="@+id/buttonExplicit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Explicit Intent"/>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:backgroundTint="@color/design_default_color_error"
    android:padding="16dp"
    tools:context=".SecondActivity">

    <TextView
        android:id="@+id/textViewResult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textSize="20sp" />

</RelativeLayout>