Toast And Intent

Button set On Click listner :

val CardView = findViewById<CardView>(R.id.biik)

CardView.setOnClickListener {
    val intent = Intent(this, MainActivity2::class.java)

    startActivity(intent)
    
}

if it didnot work .. then paste the code On card view

android:clickable="true"

Button Toast.

val btn =  findViewById<CardView>(R.id.bikk)

btn.setOnClickListener{
    Toast.makeText(this, "Click Done", Toast.LENGTH_SHORT).show()

}