Android TextView – Text Size or Font Size

Change Text Size in TextView

To change the text size in TextView widget, set the textSize attribute with required dimensions.

TextView textSize in XML Layout

<TextView
    android:textSize="20sp"
    android:text="Hello World!" />

<TextView
    android:textSize="30sp"
    android:text="Hello World!" />

<TextView
    android:textSize="40sp"
    android:text="Hello World!" />

Example

Create an Android Application with Kotlin support and Empty Activity. Create three TextView widgets with different text sizes.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/text_view_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:textSize="20sp"
        android:text="Hello World!" />

    <TextView
        android:id="@+id/text_view_2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:textSize="30sp"
        android:text="Hello World!" />

    <TextView
        android:id="@+id/text_view_3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:textSize="40sp"
        android:text="Hello World!" />

</LinearLayout>

MainActivity.kt

package com.kotlinandroid.myapp

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

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

Screenshot