Android Radio Buttons Using Kotlin With Example

Radio buttons allow the user to select one option at a time. A RadioButton as two states, selected and unselected.

Create a new Project in Kotlin

Open Android Studio.
Go to File => New => New Project. Write application name . Then, check Include Kotlin Support and click next button.
Select minimum SDK you need. However, we have selected 17 as minimum SDK. Then, click next button
Then, select Empty Activity => click next => click finish.
You will get a newly created project successfully if you have followed steps properly.

Use the below code to Implement a Radio Buttons with Kotlin

MainActivity.kt

activity_main.xml

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.*
import kotlinx.android.synthetic.main.activity_main.*
import android.widget.RadioGroup
import android.widget.Toast

class MainActivity : AppCompatActivity() {

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


//Radio button on click change

radio_group.setOnCheckedChangeListener(
    RadioGroup.OnCheckedChangeListener{
        group, checkedId ->

        val radio_langange: RadioButton = findViewById(checkedId)


        Toast.makeText(applicationContext," On Checked change :${radio_langange.text}",Toast.LENGTH_SHORT).show()


    }
)

        // Get radio group selected status and text using button click event
      button.setOnClickListener{
           // Get the checked radio button id from radio group
           var id: Int = radio_group.checkedRadioButtonId
          if (id!=-1){ // If any radio button checked from radio group
              // Get the instance of radio button using id
               val radio:RadioButton = findViewById(id)
            Toast.makeText(applicationContext,"On button click : ${radio.text}",
                 Toast.LENGTH_SHORT).show()
            }else{
                // If no radio button checked in this radio group
               Toast.makeText(applicationContext,"On button click : nothing selected",
                   Toast.LENGTH_SHORT).show()
          }
      }
   }

    // Get the selected radio button text using radio button on click listener
    fun radio_button_click(view: View){
      // Get the clicked radio button instance
      val radio: RadioButton = findViewById(radio_group.checkedRadioButtonId)
       Toast.makeText(applicationContext,"On click : ${radio.text}",
         Toast.LENGTH_SHORT).show()
    }
}

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:id="@+id/root_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:padding="16dp"
>
    <RadioGroup
            android:layout_marginTop="30dp"
            android:id="@+id/radio_group"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#bccdd5"
            android:padding="15dp"
    >
        <TextView
                android:id="@+id/title"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Which is your favorite languages?"
                android:textStyle="bold"
                android:textSize="20sp"
        />
        <RadioButton
                android:id="@+id/tvenglish"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="English"
                android:onClick="radio_button_click"
        />
        <RadioButton
                android:id="@+id/tvspanish"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Spanish"
                android:onClick="radio_button_click"
        />
        <RadioButton
                android:id="@+id/tvfrench"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="French"
                android:onClick="radio_button_click"
        />
        <RadioButton
                android:id="@+id/tvmalayalam"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Malayalam"
                android:onClick="radio_button_click"
        />
    </RadioGroup>

    <Button

            android:id="@+id/button"
            android:layout_gravity="center"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="15dp"
            android:text="Get Selected Language"
    />
</LinearLayout>

Use the below code to Implement a Radio Buttons with Kotlin

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