Implement if else in a Button while clicked

I am new to Android app development. I am developing an app with two activities. Users can jump from MainActivity to Activity2 by entering some text and clicking a button. Fortunately, I have done that. But I was expecting if the user had not entered any text, it would show a toast "You have not entered anything" & definitely the Button click event will not happen in that case. What is the way to implement this feature using if-else?

Here's my MainActivity.kt

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

import android.widget.Button
import android.widget.EditText


class MainActivity : AppCompatActivity() {

    lateinit var nameInput : EditText
    lateinit var sorryButton : Button

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



        nameInput = findViewById(R.id.nameInput)
        sorryButton = findViewById(R.id.btn_sorry)



        sorryButton.setOnClickListener {
            

            val intent = Intent(this, MainActivity2::class.java)
            val name = nameInput.editableText.toString()
            intent.putExtra("name",name)
            startActivity(intent)





        }
    }



}

If knows how to implement this please help.
Thanks.