SelectUserActivity.kt

package com.example.user

import android.app.Activity
import android.content.Intent
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.View
import android.widget.EditText

class SelectUserActivity : AppCompatActivity() {

    private val editText: EditText by lazy { findViewById<EditText>(R.id.editText) }
    private val confirm: View? by lazy { findViewById<View>(R.id.confirm) }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_details)
        confirm?.setOnClickListener {
            val data = Intent().apply { putExtra("contact", editText.text.toString()) }
            setResult(Activity.RESULT_OK, data)
            finish()
        }
    }

}