Simple Radio Button

 Java Code

package com.example.project3;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RadioButton rb1 = findViewById(R.id.r1);
        RadioButton rb2 = findViewById(R.id.r1);
        Button btn = findViewById(R.id.button);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                RadioGroup rg1 = findViewById(R.id.rg1);
                int id = rg1.getCheckedRadioButtonId();
                RadioButton rb = findViewById(id);
                Toast.makeText(MainActivity.this, rb.getText().toString(), Toast.LENGTH_SHORT).show();
            }
        });



    }
}


XML Code

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="543dp"
        android:id="@+id/rg1">

        <RadioButton
            android:id="@+id/r1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Captain Team" />

        <RadioButton
            android:id="@+id/r2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Iron Man Team" />

        <Button
            android:id="@+id/button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Button" />


    </RadioGroup>
</LinearLayout>





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