SpannableString Text Style

In this video we will learn, how to change the text style of a substring, by using the SpannableString class together with StyleSpan, UnderlineSpan and StrikethroughSpan.
This way we can make specific parts of a TextView bold, italic or bold-italic, we can underline them or put a strike-through line over the text.

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activity_main.xmlMainActivity.java

<?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:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="BOLD and ITALIC and BOLD-ITALIC and UNDERLINE and STRIKE-THROUGH"
        android:textAlignment="center"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

package com.codinginflow.spannablestringexample;

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 android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        TextView textView = findViewById(R.id.text_view);

        String text = "BOLD and ITALIC and BOLD-ITALIC and UNDERLINE and STRIKE-THROUGH";

        SpannableString ss = new SpannableString(text);

        StyleSpan boldSpan = new StyleSpan(Typeface.BOLD);
        StyleSpan italicSpan = new StyleSpan(Typeface.ITALIC);
        StyleSpan boldItalicSpan = new StyleSpan(Typeface.BOLD_ITALIC);
        UnderlineSpan underlineSpan = new UnderlineSpan();
        StrikethroughSpan strikethroughSpan = new StrikethroughSpan();

        ss.setSpan(boldSpan, 0, 4, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        ss.setSpan(italicSpan, 9, 15, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        ss.setSpan(boldItalicSpan, 20, 31, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        ss.setSpan(underlineSpan, 36, 45, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        ss.setSpan(strikethroughSpan, 50, 64, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        textView.setText(ss);
    }
}