//activity_main.xml
<?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"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/bt1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="click here"
        android:textSize="25dp"
        android:textColor="@color/design_default_color_primary"
        />


</LinearLayout>
//MainActivity.kt


import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.Toast
import androidx.activity.enableEdgeToEdge

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val b1:Button = findViewById(R.id.bt1)

        b1.setOnClickListener {
            val intent = Intent(this, DetailsActivity::class.java)

            Toast.makeText(this, "Hello Details Activity", Toast.LENGTH_SHORT).show()
            startActivity(intent)
        }
    }
}
//DetailsActivity.kt
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

class DetailsActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_details)
    }
}

//activity_details.xml
<?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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".DetailsActivity">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Welcome to second activity"
        android:textSize="35dp"
        android:textColor="@color/black"
        />

</LinearLayout>

//In the manifest.xml file below the <activity/> insert the code
<activity android:name=".DetailsActivity"></activity>