RadioButton in Android

activity_main.xml
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<LinearLayout 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:orientation="vertical"
    tools:context=".MainActivity">
  <RadioGroup
      android:layout_width="fill_parent"
      android:id="@+id/helloradio"
      android:layout_height="wrap_content"
      android:weightSum="1"
      android:layout_marginTop="25dp">
      <RadioButton
          android:layout_width="wrap_content"
          android:id="@+id/radio1"
          android:text="Male"
          android:layout_height="wrap_content"
          />
      <RadioButton
          android:layout_width="wrap_content"
          android:id="@+id/radio2"
          android:text="FeMale"
          android:layout_height="wrap_content" />
  </RadioGroup>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show Gender"
        android:layout_gravity="center"
        android:layout_marginTop="50dp"
        android:id="@+id/button" />


</LinearLayout>

MainActivity.Java

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package com.android.anil.radiobutton;



import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

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 {

    RadioGroup rg;

    RadioButton rb;

    Button genderbtn;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        rg=(RadioGroup)findViewById(R.id.helloradio);

        genderbtn=(Button)findViewById(R.id.button);

        genderbtn.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                int id=rg.getCheckedRadioButtonId();

                rb=(RadioButton)findViewById(id);

              String s1=rb.getText().toString();

           Toast.makeText(getApplicationContext(),"Gender is : "+s1,5000).show();

            }

        });  

   }

}

OutPut is :

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