RadioButton1 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"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:id="@+id/gddd">


    <RadioGroup
        android:layout_width="fill_parent"
        android:id="@+id/radiogroup1"
        android:layout_height="wrap_content"
        android:layout_marginTop="25dp">
        <RadioButton
            android:layout_width="fill_parent"
            android:id="@+id/radio1"
            android:text="Android"
            android:layout_height="wrap_content" />
        <RadioButton
            android:layout_width="fill_parent"
            android:id="@+id/radio2"
            android:text="Ios"
            android:layout_height="wrap_content" />
        <RadioButton
            android:layout_width="fill_parent"
            android:id="@+id/radio3"
            android:text="Windows"
            android:layout_height="wrap_content" />
        <RadioButton
            android:layout_width="fill_parent"
            android:id="@+id/radio4"
            android:text="Blackberry"
            android:layout_height="wrap_content" />
        <RadioButton
            android:layout_width="fill_parent"
            android:id="@+id/radio5"
            android:text="Symbain"
            android:layout_height="wrap_content" />
        <RadioButton
            android:layout_width="fill_parent"
            android:id="@+id/radio6"
            android:text="Bada"
            android:layout_height="wrap_content" />

</RadioGroup>
</LinearLayout>

MainActivity.Java
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package com.android.anil.radiobutton1;



import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.Toast;



public class MainActivity extends AppCompatActivity {

    RadioGroup rg;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



        rg=(RadioGroup)findViewById(R.id.radiogroup1);

        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

            @Override

            public void onCheckedChanged(RadioGroup group, int checkedId) {

                int id=rg.getCheckedRadioButtonId();

                RadioButton rb=(RadioButton)findViewById(id);

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

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


            }

        });

    }
}

Output is :
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