Simple example of Button and Toast (Android Kotlin)

action_primary.xml

MainActivity.kt

deal android_er.blogspot.com.myapp01

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Perspective
import android.widget.Button
import android.widget.Toast

private lateinit var btnA: Button
non-public lateinit var btnB: Button

class MainActivity : AppCompatActivity() 
    override enjoyment onCreate(savedInstanceState: Bundle?) 
        tremendous.onCreate(savedInstanceState)
        setContentView(R.structure.action_primary)

        btnA = findViewById(R.id.btn_A)
        btnB = findViewById(R.id.btn_B)

        btnA.setOnClickListener(
             view: See ->
                Toast.makeText(
                    this,
                    "Button A pressed",
                    Toast.Length_Very long,
                ).show()
            ,
        )

        btnB.setOnClickListener(
             check out: Perspective ->
                Toast.makeText(
                    this,
                    "Button B pressed",
                    Toast.Length_Extended,
                ).demonstrate()
            ,
        )