MainActivity.kt
package com.example.jetpack
import android.os.Bundle
import android.widget.RadioButton
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
button.setOnClickListener {
// get radio group checked / selected item id
val id = radioGroup.checkedRadioButtonId
when(id){
-1->{ // return -1 when none selected
textView2.text = "Nothing selected."
}else->{
val selectedItem = findViewById<RadioButton>(id)
// show the checked / selected item text in text view
textView2.text = selectedItem.text
}
}
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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="match_parent"
tools:context=".MainActivity"
android:background="#F5F5F5">
<TextView
android:id="@+id/textView"
style="@style/TextAppearance.MaterialComponents.Headline6"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:padding="8dp"
android:text="Which is your most favorite?"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<RadioGroup
android:id="@+id/radioGroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="2dp"
android:layout_marginEnd="16dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView">
<com.google.android.material.radiobutton.MaterialRadioButton
android:id="@+id/radioFlash"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Flash" />
<com.google.android.material.radiobutton.MaterialRadioButton
android:id="@+id/radioFlex"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Flex" />
<com.google.android.material.radiobutton.MaterialRadioButton
android:id="@+id/radioColdFusion"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ColdFusion" />
<com.google.android.material.radiobutton.MaterialRadioButton
android:id="@+id/radioPhotoshop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Photoshop" />
</RadioGroup>
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="@style/TextAppearance.MaterialComponents.Headline5"
android:textStyle="bold"
android:layout_marginTop="16dp"
android:textColor="#483D8B"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.547"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button"
tools:text="TextView" />
<com.google.android.material.button.MaterialButton
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Get Checked Item Text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/radioGroup" />
</androidx.constraintlayout.widget.ConstraintLayout>


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