MainActivity.kt
package com.example.jetpack
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.text.style.*
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)
val text = ("Lorem Ipsum is simply dummy text of the printing and" +
" typesetting industry. Lorem Ipsum has been the industry's" +
" standard dummy text ever since the 1500s, when an unknown" +
" printer took a galley of type and scrambled it" +
" to make a type specimen book.").toSpannable()
// Text appearance span
text[25..125] = TextAppearanceSpan(this,R.style.TextAppearance_AppCompat_Medium)
// Text appearance span custom style
text[126..200] = TextAppearanceSpan(this,R.style.CuteText)
textView.text = 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">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:padding="15dp"
android:text=""
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
res/values/styles.xml [add]
<resources>
<style name="CuteText" parent="TextAppearance.AppCompat.Large">
<item name="android:fontFamily">monospace</item>
<item name="android:textStyle">italic</item>
<item name="android:padding">15dp</item>
<item name="android:textColor">#E30022</item>
</style>
</resources>
build.gradle dependencies[add]
// android ktx
implementation 'androidx.core:core-ktx:1.2.0'
build.gradle [add]
android {
kotlinOptions {
jvmTarget = JavaVersion.VERSION_1_8.toString()
}
}

- kotlin ktx - Font family, style, size span
- kotlin ktx - URLSpan
- kotlin ktx - TabStopSpan
- kotlin ktx - SuperscriptSpan SubscriptSpan
- kotlin - ConstraintLayout set constraint programmatically
- kotlin - ConstraintLayout remove constraint programmatically
- kotlin - ConstraintLayout set margin programmatically
- kotlin - ConstraintLayout center in parent programmatically
- kotlin - Spinner text size programmatically
- kotlin - Spinner selected item background color