MainActivity.java

package co.prandroid.firstkotlin

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

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


    }

    fun btnShowValue(v: View){
        textViewResult.text=editTextValue.getText().toString()

    }
}