Приклад

package com.example.dictionary1

import androidx.appcompat.app.AppCompatActivity

import android.os.Bundle

import android.widget.Button

import android.widget.TextView

class MainActivity : AppCompatActivity() {

   private var text1: String = "Hello"

   private var t1: TextView? = null

   override fun onCreate(savedInstanceState: Bundle?) {

       super.onCreate(savedInstanceState)

       setContentView(R.layout.activity_main)

       t1 = findViewById(R.id.textView1)

       val button = findViewById<Button>(R.id.button)

       button?.setOnClickListener()

       {

           t1?.setText(text1)

       }

   }

}

Актівіті - форма +код