How To Set Radio Button Checked In Android Programmatically

In Android, we use Radio buttons when we have to select one selection from the listing of available options. A RadioButton has 2 states. A RadioButton can be checked or unchecked by the user. By default, the RadioButton has OFF (Unchecked State). So, if a user clicks a RadioButton information technology comes in a checked state then it cannot be unchecked by clicking it again. A checked RadioButton becomes unchecked when you click any other RadioButton in the aforementioned Radio Group. Then, let'south understand Radio Push button in Android with Kotlin linguistic communication.

The reward of using Radio Buttons is that a user can create a listing of available options. All these options are available to the user but the user tin select (cheque) simply one option from the listing.

We use Radio Buttons together using RadioGroup widget. RadioGroup is responsible of group Radio Buttons and it provides the feature to select one Radio Button at a time. If a RadioButton is in checked country and any other RadioButton is clicked inside the same grouping then the previously checked RadioButton becomes unchecked.

Radio Button Android Kotlin:

ane- Create a new Android Studio Project. Name your project, then in my instance, the name is "RadioButtonKotlin". Select any API level co-ordinate to your choice and cull your default language equally KOTLIN.

2- In your activity_main.xml alter the default Constraint Layout to Relative Layout. Hither we add a TextView to brandish some text and a RadioGroup.

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< TextView

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : layout_centerHorizontal = "true"

android : layout_marginTop = "130dp"

android : text = "Select Your Pick"

android : textColor = "#000000"

android : textSize = "30sp" / >

< RadioGroup

android : id = "@+id/radiogroup"

android : layout_width = "match_parent"

android : layout_height = "wrap_content"

android : layout_centerHorizontal = "truthful"

android : layout_marginTop = "180dp"

android : padding = "16dp" >

3- Inside our Radio Group we will take five Radio Buttons. We add text for our Radio Buttons and assign ids to them. We take put 1 Radio Button in a checked country by default.

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< RadioButton

android : id = "@+id/radio_1"

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : text = "Java"

android : textSize = "25sp"

android : textColor = "#000000" / >

< RadioButton

android : id = "@+id/radio_2"

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : layout_marginTop = "10dp"

android : text = "Kotlin"

android : textSize = "25sp"

android : textColor = "#000000" / >

< RadioButton

android : id = "@+id/radio_3"

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : layout_marginTop = "10dp"

android : text = "Python"

android : textSize = "25sp"

android : textColor = "#000000" / >

< RadioButton

android : id = "@+id/radio_4"

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : layout_marginTop = "10dp"

android : text = "Swift"

android : textSize = "25sp"

android : textColor = "#000000"

android : checked = "true" / >

< RadioButton

android : id = "@+id/radio_5"

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : layout_marginTop = "10dp"

android : text = "Javascript"

android : textSize = "25sp"

android : textColor = "#000000" / >

4- Finally, the complete activity_main.xml with a TextView, RadioGroup and five Radio Buttons will look like this:

activity_main.xml

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<? xml version = "i.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"

tools : context = ".MainActivity" >

< TextView

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : layout_centerHorizontal = "true"

android : layout_marginTop = "130dp"

android : text = "Select Your Pick"

android : textColor = "#000000"

android : textSize = "30sp" / >

< RadioGroup

android : id = "@+id/radiogroup"

android : layout_width = "match_parent"

android : layout_height = "wrap_content"

android : layout_centerHorizontal = "truthful"

android : layout_marginTop = "180dp"

android : padding = "16dp" >

< RadioButton

android : id = "@+id/radio_1"

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : text = "Java"

android : textSize = "25sp"

android : textColor = "#000000" / >

< RadioButton

android : id = "@+id/radio_2"

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : layout_marginTop = "10dp"

android : text = "Kotlin"

android : textSize = "25sp"

android : textColor = "#000000" / >

< RadioButton

android : id = "@+id/radio_3"

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : layout_marginTop = "10dp"

android : text = "Python"

android : textSize = "25sp"

android : textColor = "#000000" / >

< RadioButton

android : id = "@+id/radio_4"

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : layout_marginTop = "10dp"

android : text = "Swift"

android : textSize = "25sp"

android : textColor = "#000000"

android : checked = "truthful" / >

< RadioButton

android : id = "@+id/radio_5"

android : layout_width = "wrap_content"

android : layout_height = "wrap_content"

android : layout_marginTop = "10dp"

android : text = "Javascript"

android : textSize = "25sp"

android : textColor = "#000000" / >

< / RadioGroup >

< / RelativeLayout >

five- So, now in our MainActivity.kt file nosotros simply add onClickListener on our Radio Buttons. With the assistance of an onClickListener we will display a Toast bulletin. We set up onClickListener in our onCreate function.

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radio_1 . setOnClickListener {

Toast . makeText ( this , "Y'all Selected: Coffee" , Toast . LENGTH_SHORT ) . show ( )

}

radio_2 . setOnClickListener {

Toast . makeText ( this , "You Selected: Kotlin" , Toast . LENGTH_SHORT ) . show ( )

}

radio_3 . setOnClickListener {

Toast . makeText ( this , "You Selected: Python" , Toast . LENGTH_SHORT ) . show ( )

}

radio_4 . setOnClickListener {

Toast . makeText ( this , "You Selected: Swift" , Toast . LENGTH_SHORT ) . testify ( )

}

radio_5 . setOnClickListener {

Toast . makeText ( this , "You Selected: Javascript" , Toast . LENGTH_SHORT ) . show ( )

}

6- Then our complete MainActivity.kt file volition exist like this:

MainActivity.kt

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package com . example . radiobuttonkotlin

import androidx . appcompat . app . AppCompatActivity

import android . os . Bundle

import android . widget . Toast

import kotlinx . android . synthetic . main . activity_main . *

form MainActivity : AppCompatActivity ( ) {

override fun onCreate ( savedInstanceState : Bundle ? ) {

super . onCreate ( savedInstanceState )

setContentView ( R . layout . activity_main )

radio_1 . setOnClickListener {

Toast . makeText ( this , "You Selected: Coffee" , Toast . LENGTH_SHORT ) . show ( )

}

radio_2 . setOnClickListener {

Toast . makeText ( this , "You Selected: Kotlin" , Toast . LENGTH_SHORT ) . prove ( )

}

radio_3 . setOnClickListener {

Toast . makeText ( this , "You lot Selected: Python" , Toast . LENGTH_SHORT ) . show ( )

}

radio_4 . setOnClickListener {

Toast . makeText ( this , "You Selected: Swift" , Toast . LENGTH_SHORT ) . bear witness ( )

}

radio_5 . setOnClickListener {

Toast . makeText ( this , "You Selected: Javascript" , Toast . LENGTH_SHORT ) . show ( )

}

And so, this is information technology for our Radio Button Android Kotlin example. I hope at present y'all accept learned how to use Radio Button in Android Studio only nevertheless, if you have any queries regarding Android Radio Push then yous can definitely ask in the comments department beneath.