How do I add a bullet symbol in TextView?

You may try BulletSpan as described in Android docs.

SpannableString string = new SpannableString("Text with\nBullet point");
string.setSpan(new BulletSpan(40, color, 20), 10, 22, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

Another best way to add bullet in any text view is stated below two steps:

First, create a drawable

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">

    <!--set color of the bullet-->
   <solid 
       android:color="#666666"/> //set color of bullet

    <!--set size of the bullet-->
   <size 
       android:width="120dp"
        android:height="120dp"/>
</shape>

Then add this drawable in textview and set its pedding by using below properties

android:drawableStart="@drawable/bullet"
android:drawablePadding="10dp"

(almost) all of the options are about using html tags.

you can use drawables for your TextView if it has only one line of text.

something like this:

<TextView
            android:id="@+id/tv_with_bullet"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            app:drawableStartCompat="@drawable/ic_desired_bullet_icon" />

and add your desired bullet drawable in SVG. it literally takes no space and makes you free of adding complicated string literals. you can also download the SVG file for a bullet point in here