How to edit the text in TextView using spannable string in your Android App?

In this video it shows how one can use spannable string to edit the text and then set it in textview. It spans the spannable string for BOLD and Underline editing as examples in this video.

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Complete source code and other details:

package com.programmerworld.edittextviewapp;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Typeface;
import android.os.Bundle;
import android.text.SpannableString;
import android.text.style.StyleSpan;
import android.text.style.UnderlineSpan;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private TextView textView;

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

        textView = findViewById(R.id.textView);
    }

    public void buttonEditText(View view){
        SpannableString spannableString = new SpannableString("Hello, Programmer World. " +
                "This is a sample text.");
        spannableString.setSpan(new StyleSpan(Typeface.BOLD), 7, 17, 0);
        spannableString.setSpan(new UnderlineSpan(), 18, 23, 0);
        textView.setText(spannableString);
    }
}

<?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="251dp"
        android:layout_height="209dp"
        android:text="Hello World!"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="132dp"
        android:layout_marginTop="68dp"
        android:onClick="buttonEditText"
        android:text="Edit Text"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>