How to click the back button twice to exit application in Koltin

In this android kotlin source code example, we are going to click the back button twice to exit application in koltin.

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 click the back button twice to exit application in Koltin.

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.ButtonActivity10">

    <androidx.appcompat.widget.AppCompatTextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#1F1F1F"
        android:text="Click back button twice to exit"
        android:gravity="center"
        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 com.bluapp.kotlinview.R



class ButtonActivity10 : AppCompatActivity() {
    private var k = 0


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_button10)
    }

    override fun onBackPressed() {
        k++;
        if(k == 1) {
            Toast.makeText(this@ButtonActivity10,"Click one more time to exist app", Toast.LENGTH_SHORT).show()
        } else {
            super.onBackPressed();
        }

    }
}

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