MainActivity.kt

class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding= ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        binding.button.setOnClickListener {
            tiklaFun()
        }
    }

    fun tiklaFun(){
        Toast.makeText(this,"Butona tıklandı.",Toast.LENGTH_SHORT).show()
    }
}