Button

package com.example.lipnus.button

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

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

        lipnus_button.setOnClickListener(){
            Toast.makeText(applicationContext, "토스트 메시지", Toast.LENGTH_LONG).show()
        }
    }
}

Binding이 된다는 것 이외에는 별다른 것이 없다