How to implement radio buttons in a radio group in your android app?

In this video it shows the code to implement the Radio Buttons in a Radio Group in your Android App’s Java code in Android Studio.

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Complete source code and other details:

package com.programmerworld.radiobuttons;

import android.os.Bundle;
import android.view.View;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });
    }

    public void radioGroupOnclick(View view){
        TextView textView = findViewById(R.id.textView);
        RadioGroup radioGroup = findViewById(R.id.radioGroup);
        int intRadioButtonID = radioGroup.getCheckedRadioButtonId();
        RadioButton radioButton = findViewById(intRadioButtonID);

        switch (radioButton.getText().toString()){
            case "Alpha":
                textView.setText("Selected Button is " + radioButton.getText().toString());
                break;
            case "Beta":
                textView.setText("Selected Button is " + radioButton.getText().toString());
                break;
            case "Charlie":
                textView.setText("Selected Button is " + radioButton.getText().toString());
                break;
            case "Delta":
                textView.setText("Selected Button is " + radioButton.getText().toString());
                break;
            default:
                textView.setText("Default Button selected");
        }
    }
}

<?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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.586" />

    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="343dp"
        android:layout_height="266dp"
        android:layout_marginStart="58dp"
        android:layout_marginTop="29dp"
        android:onClick="radioGroupOnclick"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <RadioButton
            android:id="@+id/radioButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Alpha" />

        <RadioButton
            android:id="@+id/radioButton2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Beta" />

        <RadioButton
            android:id="@+id/radioButton3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Charlie" />

        <RadioButton
            android:id="@+id/radioButton4"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Delta" />

        <RadioButton
            android:id="@+id/radioButton5"
            android:layout_width="match_parent"
            android:layout_height="59dp"
            android:checked="true"
            android:text="Default" />
    </RadioGroup>

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="112dp"
        android:layout_marginTop="44dp"
        android:onClick="radioGroupOnclick"
        android:text="RadioGroup Selection"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/radioGroup" />

</androidx.constraintlayout.widget.ConstraintLayout>

Screenshots: