Now, we have to implement a JAVA code line which can be as a backend system so we have to put all JAVA code under the onCreate method in the MainActivity.java file given below.
CardView callBtn01 = findViewById(R.id.cardBtn01);
callBtn01.setOnClickListener(v -> {
Intent intent = new Intent(Intent.ACTION_DIAL);
intent.setData(Uri.parse("tel: 1234567890"));
startActivity(intent);
});::: Thank You :::
