Description

By reading this article you will get a detailed description of a radio button and their purpose for being used Applications. It has two states either on/off. It is widely used in application, web forms to get information from the user.

In Radio button, there are so many options available in the application in web forms so that user can fill the appropriate field.

This article describes about two radio buttons and one onclick button which response when a user sends a feedback through radio button it produces a message on the screen through Toast. onChecked method is called when an input is given by the user clicking the button.

Attributes

o android:contentDescription: Attribute defines the description of the content item

o android: background: Drawable elements are used to set in the background

o android: visibility: It is used to set the visibility of controls

o android: onClick: Onclick handles the checked or unchecked state of a radio button

Methods

o toggle(): This method checking the status of a checked and unchecked radio button

o onClick(): It handles the user response when user checks the box

Android_Manifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mapsample.msclient009.radiobutton">
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Main_Activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:orientation="vertical" 
    tools:context="com.mapsample.msclient009.radiobutton.MainActivity"> 
    <TextView 
        android:layout_width="match_parent" 
        android:layout_height="66dp" 
        android:gravity="center" 
        android:text="Radio Button Description" 
        android:textSize="20dp"/> 
    <RadioGroup 
        android:id="@+id/RadioGp" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:orientation="vertical"> 
        <RadioButton 
            android:id="@+id/rdbtn2" 
            android:layout_width="391dp" 
            android:layout_height="wrap_content" 
            android:layout_weight="1" 
            android:text="@android:string/no" 
            android:textColorLink="@android:color/background_dark" 
            tools:text="No" /> 
        <RadioButton 
            android:id="@+id/rdbtn1" 
            android:layout_width="364dp" 
            android:layout_height="47dp" 
            android:layout_weight="1" 
            android:text="@android:string/yes" 
            tools:text="Yes" /> 
    </RadioGroup> 
    <Button 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:onClick="onChecked" 
        android:text="RadioButtonChecked" /> 
</LinearLayout> 

Main_Activity.java

package com.mapsample.msclient009.radiobutton;



import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.Toast;



public class MainActivity extends AppCompatActivity {

  RadioGroup rgp ;

  RadioButton rbtn1;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate ( savedInstanceState );

        setContentView ( R.layout.activity_main );

            rgp =(RadioGroup)findViewById ( R.id.RadioGp );

    }



    public void onChecked(View view) {

        int selectedbtn =rgp.getCheckedRadioButtonId ();

        rbtn1 =(RadioButton)findViewById ( selectedbtn );

        if(selectedbtn== -1)

        {

            Toast.makeText (MainActivity.this,"None is selected",Toast.LENGTH_LONG ).show ();

        }

        else

        {Toast.makeText ( MainActivity.this,"You have selected one Button",Toast.LENGTH_LONG ).show ();



        }

    }

}

         Launch Your APP