Radio Button Example in Android

A radio button is a two-states button that can be either checked or unchecked. When the radio button is unchecked, the user can press or click it to check it. However, contrary to a CheckBox, a radio button cannot be unchecked by the user once checked.

Radio buttons are normally used together in a RadioGroup. When several radio buttons live inside a radio group, checking one radio button unchecks all the others.

This example shows the how to create a Radio button in Xml File...and when user choose one option from Radio Buttons. Choose button text will appear in Text View.....

UI layout(radiobutton.xml) create this xml in res/layout 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textshow"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

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

        <RadioButton
            android:id="@+id/button1"
            android:checked="false"
            android:text="Android " />

        <RadioButton
            android:id="@+id/button2"
            android:checked="false"
            android:text="iphone" />
    </RadioGroup>

    <Button
        android:id="@+id/select"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Confrom selection shows in Text " >
    </Button>

</LinearLayout>


Android Activity Class(RBexample.java)

package com.androidsurya.radiobutton;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.TextView;

public class RBexample extends Activity {

/** Called when the activity is first created. */

RadioButton rbone;
RadioButton rbtwo;
TextView textView;
Button button;

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.radiobutton);
rbone = (RadioButton) findViewById(R.id.button1);
rbtwo = (RadioButton) findViewById(R.id.button2);
button = (Button) findViewById(R.id.select);
textView = (TextView) findViewById(R.id.textshow);
button.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
if (rbone.isChecked() == true) {
textView.setText("Andriod");
}
if (rbtwo.isChecked() == true) {
textView.setText("iphone");
}
}
});
}
}

Register Android Activity in Android Manifest file

  <activity
            android:name="com.androidsurya.radiobutton.RBexample"
            android:label="@string/app_name" >

Output Screenshot

For More information about Radio Group: Android Developers site