How to set a particular font for a button text in Android using Kotlin?

This example demonstrates how to set a particular font for a button text in Android using Kotlin
Step 1 − Create a new project in Android Studio, go to File? New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
   tools:context=".MainActivity">
<TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_centerHorizontal="true"
   android:layout_marginTop="50dp"
   android:text="Tutorials Point"
   android:textAlignment="center"
   android:textColor="@android:color/holo_green_dark"
   android:textSize="32sp"
   android:textStyle="bold" />
<Button
   android:id="@+id/btnChangeFont"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_centerInParent="true"
   android:text="Click to change font of the Button" />
<Button
   android:id="@+id/btnChangeFont2"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_below="@id/btnChangeFont"
   android:layout_centerInParent="true"
   android:layout_marginTop="10dp"
   android:text="Click to change font of the Button" />
</RelativeLayout>
Step 3 − Add the following code to src/MainActivity.kt
import android.graphics.Typeface
import android.graphics.Typeface.BOLD_ITALIC
import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
   lateinit var btnChangeFont: Button
   lateinit var btnChangeFont2: Button
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp"
      btnChangeFont = findViewById(R.id.btnChangeFont)
      btnChangeFont.setOnClickListener { btnChangeFont.setTypeface(Typeface.MONOSPACE, Typeface.BOLD)}
      btnChangeFont2 = findViewById(R.id.btnChangeFont2)
      btnChangeFont2.setOnClickListener { btnChangeFont2.setTypeface(Typeface.SERIF, BOLD_ITALIC) }
   }
}
Step 4 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.q11">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen
Click here to download the project code.