MainActivity.kt
package com.example.jetpack
import android.content.Context
import android.graphics.drawable.Drawable
import android.os.Bundle
import android.text.style.DynamicDrawableSpan
import android.widget.RadioButton
import androidx.appcompat.app.AppCompatActivity
import androidx.core.text.set
import androidx.core.text.toSpannable
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// set radio buttons icon and text programmatically
setRadioImageText(radioNormal,
R.drawable.ic_text_format," Normal text")
setRadioImageText(radioBold,
R.drawable.ic_format_bold," Bold text")
setRadioImageText(radioItalic,
R.drawable.ic_format_italic," Italic text")
setRadioImageText(radioUnderline,
R.drawable.ic_format_underlined," Underlined text")
setRadioImageText(radioStrikethrough,
R.drawable.ic_format_striketrough," Strike through text")
// radio group checked change listener
radioGroup.setOnCheckedChangeListener { radioGroup, i ->
// get the radio group checked radio button
findViewById<RadioButton>(i)?.apply {
// show the checked radio button's text in text view
textView2.text = text.removeRange(0..1)
}
}
}
}
// extension function to programmatically show image and text in radio button
fun Context.setRadioImageText(
radioButton: RadioButton,
drawableId: Int,
text: String
){
// make the text spannable
val spannable = text.toSpannable()
// dynamic drawable span from drawable resource
spannable[0..1] = object : DynamicDrawableSpan(){
override fun getDrawable(): Drawable? {
val drawable: Drawable? = getDrawable(drawableId)
drawable?.setBounds(
0,
0,
drawable.intrinsicWidth,
drawable.intrinsicHeight
)
return drawable
}
}
// finally, show image and text in radio button
radioButton.text = spannable
}
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="#E5E4E2">
<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="Select any one text style."
android:typeface="monospace"
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/radioNormal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Normal" />
<com.google.android.material.radiobutton.MaterialRadioButton
android:id="@+id/radioBold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Bold" />
<com.google.android.material.radiobutton.MaterialRadioButton
android:id="@+id/radioItalic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Italic" />
<com.google.android.material.radiobutton.MaterialRadioButton
android:id="@+id/radioUnderline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Underline" />
<com.google.android.material.radiobutton.MaterialRadioButton
android:id="@+id/radioStrikethrough"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Strike through" />
</RadioGroup>
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:textColor="#32174D"
android:textSize="30sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/radioGroup"
tools:text="TextView" />
</androidx.constraintlayout.widget.ConstraintLayout>
build.gradle(app) [code to add]
android {
kotlinOptions {
jvmTarget = JavaVersion.VERSION_1_8.toString()
}
}
dependencies {
// android ktx
implementation 'androidx.core:core-ktx:1.3.1'
}
- android kotlin - Convert dp to pixels programmatically
- android kotlin - Get screen size from context
- android kotlin - RecyclerView horizontal
- android kotlin - RecyclerView divider line
- android kotlin - GridView item height
- android kotlin - GridView add item dynamically
- android kotlin - CheckBox checked change listener
- android kotlin - Set CardView elevation
- android kotlin - Set CardView background color
- android kotlin - Set CardView corner radius
- android kotlin - RadioButton circle color programmatically
- android kotlin - Change checked RadioButton text color
- android kotlin - RadioGroup onCheckedChange listener
- android kotlin - Get RadioGroup selected item
- android kotlin - RadioButton onClick event