Text Style of a Substring - Android Studio - Kotlin

We will change the style of some sub-strings of text of TextView using the ''SpannableString'' class
✓BOLD
✓ITALIC
✓BOLD_ITALIC
✓STRIKE-THROUGH
✓UNDERLINE

VIDEO

Step 1: Create a new Project or open new project

Step 2: Code

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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/text_view"
        android:textSize="18sp"
        android:textColor="#000"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

MainActivity.kt

package com.blogspot.atifsoftwares.textstleskotlin

import android.graphics.Typeface
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.text.SpannableString
import android.text.Spanned
import android.text.style.StrikethroughSpan
import android.text.style.StyleSpan
import android.text.style.UnderlineSpan
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        //the text to set in TextView
        val mText = "Our text can be BOLD and ITALIC and BOLD-ITALIC and STRIKE-THROUGH and UNDERLINE."
        //creating spannable string from normal string. we will use it to apply StyleSpan to substrings
        val mBSpannableString = SpannableString(mText)
        //styles to apply on substrings
        val mBold = StyleSpan(Typeface.BOLD) //bold
        val mItalic = StyleSpan(Typeface.ITALIC) //italic
        val mBoldItalic = StyleSpan(Typeface.BOLD_ITALIC) //bold italic
        val mStrikeThrough = StrikethroughSpan() //strike through
        val mUnderlineSpan = UnderlineSpan() //underline

        //applying styles to substrings
        mBSpannableString.setSpan(mBold, 16, 20, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
        mBSpannableString.setSpan(mItalic, 25, 31, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
        mBSpannableString.setSpan(mBoldItalic, 36, 47, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
        mBSpannableString.setSpan(mStrikeThrough, 52, 66, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
        mBSpannableString.setSpan(mUnderlineSpan, 71, 80, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)

        //setting text to TextView
        text_view.text = mBSpannableString

    }
}

Step 3: Run Project

Output

Check this tutorial for java