android kotlin ktx - Font family, style, size span example

MainActivity.kt


package com.example.jetpack

import android.graphics.Typeface
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()

        // Relative size span
        text[0..1] = RelativeSizeSpan(2.0f)

        // Typeface span
        text[0..50] = TypefaceSpan("monospace")

        // Style span italic
        text[45..85] = StyleSpan(Typeface.ITALIC)

        // Style span bold italic
        text[50..75] = StyleSpan(Typeface.BOLD_ITALIC)

        // Style span underline
        text[70..125] = UnderlineSpan()

        // Strike through span
        text[120..175] = StrikethroughSpan()

        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=""
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

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()
    }
}

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