Android - RadioButton Control

A RadioButton has two states: either checked or unchecked.This allows the user to select one option from a set.
This example will take you through simple steps to show how to create your own Android application using Linear Layout and RadioButton.
Following is the content of the modified main activity file src/MainActivity.java. This file can include each of the fundamental lifecycle methods.
package com.example.saira_000.myapplication;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
   RadioGroup rg1;
   RadioButton rb1;
   Button b1;
   
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      addListenerRadioButton();
   }
   
   private void addListenerRadioButton() {
      rg1 = (RadioGroup) findViewById(R.id.radioGroup);
      b1 = (Button) findViewById(R.id.button2);
      b1.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            int selected=rg1.getCheckedRadioButtonId();
            rb1=(RadioButton)findViewById(selected);
            Toast.makeText(MainActivity.this,rb1.getText(),Toast.LENGTH_LONG).show();
         }
      });
   }
}
Following will be the content of res/layout/activity_main.xml file −
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
   android:paddingLeft="@dimen/activity_horizontal_margin"
   android:paddingRight="@dimen/activity_horizontal_margin"
   android:paddingTop="@dimen/activity_vertical_margin"
   tools:context=".MainActivity">
   
   <TextView
      android:id="@+id/textView1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Example of Radio Button"
      android:layout_alignParentTop="true"
      android:layout_centerHorizontal="true"
      android:textSize="30dp" />
      
   <TextView
      android:id="@+id/textView2"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Tutorials point"
      android:textColor="#ff87ff09"
      android:textSize="30dp"
      android:layout_above="@+id/imageButton"
      android:layout_centerHorizontal="true"
      android:layout_marginBottom="40dp" />
      
   <ImageButton
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/imageButton"
      android:src="@drawable/abc"
      android:layout_centerVertical="true"
      android:layout_centerHorizontal="true" />
      
   <Button
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/button2"
      android:text="ClickMe"
      android:layout_alignParentBottom="true"
      android:layout_centerHorizontal="true" />
   
   <RadioGroup
      android:id="@+id/radioGroup"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:layout_below="@+id/imageButton"
      android:layout_alignLeft="@+id/textView2"
      android:layout_alignStart="@+id/textView2">
         
      <RadioButton
         android:layout_width="142dp"
         android:layout_height="wrap_content"
         android:text="JAVA"
         android:id="@+id/radioButton"
         android:textSize="25dp"
         android:textColor="@android:color/holo_red_light"
         android:checked="false"
         android:layout_gravity="center_horizontal" />
         
      <RadioButton
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="ANDROID"
         android:id="@+id/radioButton2"
         android:layout_gravity="center_horizontal"
         android:checked="false"
         android:textColor="@android:color/holo_red_dark"
         android:textSize="25dp" />
         
      <RadioButton
         android:layout_width="136dp"
         android:layout_height="wrap_content"
         android:text="HTML"
         android:id="@+id/radioButton3"
         android:layout_gravity="center_horizontal"
         android:checked="false"
         android:textSize="25dp"
         android:textColor="@android:color/holo_red_dark" />
         
   </RadioGroup>
      
</RelativeLayout>
Following will be the content of res/values/strings.xml to define these new constants −
<?xml version="1.0" encoding="utf-8"?>
<resources>
   <string name="app_name">My Application</string>
</resources>
Following is the default content of  AndroidManifest.xml −
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.example.saira_000.myapplication" >
   
   <application
      android:allowBackup="true"
      android:icon="@drawable/ic_launcher"
      android:label="@string/app_name"
      android:theme="@style/AppTheme" >
      
      <activity
         android:name="com.example.My Application.MainActivity"
         android:label="@string/app_name" >
      
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>

      </activity>
      
   </application>
</manifest>
Let's try to run your My Application application. I assume you had created your AVD while doing environment setup. To run the app from Android Studio, open one of your project's activity files and click Run  icon from the toolbar. Android Studio installs the app on your AVD and starts it and if everything is fine with your setup and application, it will display following Emulator window −
If User selected any of a Radio Button, It should give same name on Toast message. for suppose, if User selected JAVA, it gives a toast message as JAVA
I will recommend to try above example with different attributes of RadioButton in Layout XML file as well at programming time to have different look and feel of the RadioButton. Try to make it editable, change to font color, font family, width, textSize etc and see the result. You can also try above example with multiple RadioButton controls in one activity.

    46 Lectures 
     7.5 hours 

 Aditya Dua

    32 Lectures 
     3.5 hours 

 Sharad Kumar

    9 Lectures 
     1 hours 

 Abhilash Nelson

    14 Lectures 
     1.5 hours 

 Abhilash Nelson

    15 Lectures 
     1.5 hours 

 Abhilash Nelson

    10 Lectures 
     1 hours 

 Abhilash Nelson
 Print
 Add Notes
 Bookmark this page