How to set an onClickListener to a button in kotlin

In this android kotlin programming source code example, we are going to set an onClickListener to a button in kotlin.

You can copy and adopt this source code example to your Kotlin android project without reinventing the wheel.

Below is a step by step source code to set an onClickListener to a button in kotlin.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Button.ButtonActivity21">

    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/onclickBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:textColor="#ffffff"
        android:text="Show Toast"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.widget.AppCompatButton
import com.bluapp.kotlinview.R

class ButtonActivity21 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_button21)
        val onclickBtn = findViewById<AppCompatButton>(R.id.onclickBtn)
        onclickBtn.setOnClickListener {
            Toast.makeText(this@ButtonActivity21, "Button was click", Toast.LENGTH_SHORT).show()
        }
    }
}

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