Material Toggle Button (Material Design Component: MDC)

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=".MainActivity">

    <com.google.android.material.button.MaterialButtonToggleGroup
        android:id="@+id/toggleButtonGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:singleSelection="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <Button
            android:id="@+id/btnAndroid"
            style="@style/Widget.MaterialComponents.Button.OutlinedButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Android" />

        <Button
            android:id="@+id/btnFlutter"
            style="@style/Widget.MaterialComponents.Button.OutlinedButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Flutter" />

        <Button
            android:id="@+id/btnWeb"
            style="@style/Widget.MaterialComponents.Button.OutlinedButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Web" />

    </com.google.android.material.button.MaterialButtonToggleGroup>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

package com.sriyank.mdccomponents

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

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

        toggleButtonGroup.addOnButtonCheckedListener { toggleButtonGroup, checkedId, isChecked ->

            if (isChecked) {
                when (checkedId) {
                    R.id.btnAndroid -> showToast("Robot that looks like human.")
                    R.id.btnFlutter -> showToast("It's a Butterfly thing.")
                    R.id.btnWeb -> showToast("You still exist?")
                }
            } else {
                if (toggleButtonGroup.checkedButtonId == View.NO_ID) {
                    showToast("Nothing Selected")
                }
            }
        }
    }

    private fun showToast(str: String) {
        Toast.makeText(this, str, Toast.LENGTH_SHORT).show()
    }
}

Material ToggleButton belongs to Material Design Component or MDC library. Toggle Buttons can be used to select from a group of choices just like Radio Buttons present in a Radio Group. In this video you will learn:

• How to create Toggle Button
• Group them in "com.google.android.material.button.MaterialButtonToggleGroup"
• Set addOnButtonCheckedListener on toggle button group
• Purpose of using singleSelection attribute
• Perform an action when the user deselects a button (when nothing is selected)