Dynamic RadioButton Android

The Radio Button in android can also be created programmatically or dynamically, other than creating it through drag and drop from the palette. With a single click, we can convert an unchecked radio button to a checked radio button. The user cannot mark a checked radio button to unchecked. It is generally used with RadioGroup. Several radio buttons are present in a RadioGroup. The android.view.ViewGroup.LayoutParams is used to create dynamic RadioButton. It configures the width and height of views. It also implements the setOnCheckedChangeListener() method of the RadioGroup class.

Example of Dynamic RadioButton:

activity_main.xml: (File: activity_main.xml)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
       xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:tools="http://schemas.android.com/tools"
       xmlns:app="http://schemas.android.com/apk/res-auto"
       android:id="@+id/container"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       tools:context=".MainActivity"
       android:orientation="vertical">
 
   <RadioGroup
           android:id="@+id/radioGroup"
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:paddingStart="25dp">
   </RadioGroup>
</LinearLayout>

Activity class: (File: MainActivity.java)

package com.example.dynamicradio
 
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.annotation.SuppressLint
import android.view.ViewGroup
import android.widget.LinearLayout
import android.widget.RadioButton
import android.widget.RadioGroup
import android.widget.Toast
 
class MainActivity : AppCompatActivity() {
 
 
       @SuppressLint("ResourceType")
       override fun onCreate(savedInstanceState: Bundle?)
       {
           super.onCreate(savedInstanceState)
           setContentView(R.layout.activity_main)
 
           val linearLayout = findViewById<LinearLayout>(R.id.container)
 
           // Create RadioButton programmatically
           val radioButton1 = RadioButton(this)
           radioButton1.layoutParams= LinearLayout.LayoutParams(
               ViewGroup.LayoutParams.WRAP_CONTENT,
               ViewGroup.LayoutParams.WRAP_CONTENT)
           radioButton1.setText("Jeans")
           radioButton1.id = 1
 
           val radioButton2 = RadioButton(this)
           radioButton2.layoutParams = LinearLayout.LayoutParams(
               ViewGroup.LayoutParams.WRAP_CONTENT,
               ViewGroup.LayoutParams.WRAP_CONTENT)
           radioButton2.setText("Shirt")
           radioButton2.id = 2
 
           val radioButton3 = RadioButton(this)
           radioButton3.layoutParams = LinearLayout.LayoutParams(
               ViewGroup.LayoutParams.WRAP_CONTENT,
               ViewGroup.LayoutParams.WRAP_CONTENT)
           radioButton3.setText("Gown")
           radioButton3.id = 3
 
           val radioGroup = findViewById<RadioGroup>(R.id.radioGroup)
           if (radioGroup != null)
           {
               radioGroup.addView(radioButton1)
               radioGroup.addView(radioButton2)
               radioGroup.addView(radioButton3)
 
               radioGroup.setOnCheckedChangeListener { group, checkedId ->
                   var string = getString(R.string.you_selected)
                   string += " " + getString(
                       if (checkedId == 1) R.string.jeans
                       else if(checkedId == 2 ) R.string.shirt
                       else R.string.gown )
                   Toast.makeText(applicationContext, string, Toast.LENGTH_SHORT).show()
               }
           }
       }
   }

strings.xml:

<resources>
   <string name="app_name">DynamicRadio</string>
   <string name="jeans">Jeans</string>
   <string name="shirt">Shirt</string>
   <string name="gown">Gown</string>
   <string name="you_selected">You selected:</string>
</resources>

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
         package="com.example.dynamicradio">
 
   <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>

Output 1:

Output 2:

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