How to set OnclickListener on a radio button in android?

This example demonstrates how do I set OnclickListener on a radio button in android.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
   android:gravity="center"
   tools:context=".MainActivity">
   <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_above="@id/radioGroup"
      android:layout_marginBottom="20sp"
      android:layout_centerInParent="true"
      android:textSize="16sp"
      android:textStyle="bold|italic"
      android:text="Select your favourite to drive..."/>
   <RadioGroup
      android:id="@+id/radioGroup"
      android:layout_centerInParent="true"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:orientation="vertical">
      <RadioButton
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="BMW"
         android:onClick="onClickedBMW"/>
   <RadioButton
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="NISSAN GTR"
      android:onClick="onClickedNissan"/>
   <RadioButton
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Lamborghini"
      android:onClick="onClickedLamborghini"/>
   </RadioGroup>
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
   }
   public void onClickedBMW(View view) {
      Toast.makeText(this, "BMW is selected for a drive!", Toast.LENGTH_SHORT).show();
   }
   public void onClickedNissan(View view) {
      Toast.makeText(this, "Nissan GTR is selected for a drive!", Toast.LENGTH_SHORT).show();
   }
   public void onClickedLamborghini(View view) {
      Toast.makeText(this, "Lamborghini is selected for a drive!", Toast.LENGTH_SHORT).show();
   }
}

Step 4 - Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –