Android RadioButton in RadioGroup Example

In this tutorial we will see how to create radio button in android , Radio buttons allow user to select only one option at a time from a given set .
 
In android the RadioButtons usually are grouped under RadioGroup , In a group if you select one RadioButton then others are deselected .

In this tutorial , we will see an example of three Radiobutton  which are grouped under RadioGroup.



Lets see an example of radio group 

Project Detail

Project Name	RadiogroupDemo
Package	com.pavan.radiogroupdemo
Minimum SDK	API 8
Target SDK	API 17
Theme	Holo Light with Dark Action Bar

1. XML Layout

file:- activity_main.xml

< LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:orientation="vertical"
     android:padding="20px" >

        < RadioGroup
            android:id="@+id/radiogroup_OS"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

                 < RadioButton
                      android:id="@+id/radio_android"
                      android:text="Android" />

                 < RadioButton
                      android:id="@+id/radio_ios"
                      android:text="IOS" />

                 < RadioButton
                      android:id="@+id/radio_windows"
                      android:text="Windows" />
 
     < /RadioGroup>
 
< /LinearLayout>

2. Activity

file : MainActivity.java

package com.pavan.radiogroupdemo;
import com.pavan.androidradiogroupdemo.R;
import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;

public class MainActivity extends Activity implements OnCheckedChangeListener {

 RadioGroup radiogroup;
 RadioButton radiobutton;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  // get the id's of views
  radiogroup = (RadioGroup) findViewById(R.id.radiogroup_OS);

  // set the listeners for the views
  radiogroup.setOnCheckedChangeListener(this);

 }

 @Override
 public void onCheckedChanged(RadioGroup group, int checkedId) {
  // TODO Auto-generated method stub
  radiobutton = (RadioButton) findViewById(checkedId);
  Toast.makeText(this, "You selected: " + radiobutton.getText(),
    Toast.LENGTH_SHORT).show();
 }
}