Android Kotlin SwitchCompat (on/off) Button

A Switch is a two-state toggle switch widget that can select between two options. The user may drag the "thumb" back and forth to choose the selected option, or simply tap to toggle SwitchCompat is a version of the Switch widget which runs on devices back to API 7. Android Switch and ToggleButton both are the subclasses of CompoundButton class. Lets see a sample example .  XML Layout Create XML Layout activity_main.xml , this will be set as content view for launcher Activity (MainActivity.kt) Added Seekbar To the xml layout . file : activity_main.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" android:padding="30dp" android:orientation="vertical" android:id="@+id/root"> <androidx.appcompat.widget.SwitchCompat android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Swtich Button" android:id="@+id/switchCompat01"/> </LinearLayout> setOnCheckedChangeListener For Switch Button setOnCheckedChangeListener is a callback that notifies swtich button is on /off switchCompat01.setOnCheckedChangeListener { buttonView, isChecked -> val msg: String = if (isChecked) "Switch Button is Checked" else "Switch Button is UnChecked" showToast(msg) } Activity Create a koltin class MainActivity.kt and extend it to AppCompatActivity class . Override onCreate function and set the content of this MainActivity with above defined xml layout (activity_main.xml). Set the setOnCheckedChangeListener for swtich and show the status  . file : MainActivity.kt package com.tutorialsbuzz.androidswtich import android.os.Bundle import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) switchCompat01.setOnCheckedChangeListener { buttonView, isChecked -> val msg: String = if (isChecked) "Switch Button is Checked" else "Switch Button is UnChecked" showToast(msg) } } private fun showToast(msg: String) { Toast.makeText(this@MainActivity, msg, Toast.LENGTH_SHORT).show() } } DOWNLOAD CODE