How to set android notification icon?

This example demonstrate about How to set android notification icon

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" ?>
   xmlns: android = ""
   xmlns: app = ""
   xmlns: tools = ""
   android :layout_width= "match_parent"
   android :layout_height= "match_parent"
   android :padding= "16dp"
   tools :context= ".MainActivity" >
      android :id= "@+id/btnCreateNotification"
      android :layout_width= "0dp"
      android :layout_height= "wrap_content"
      android :text= "Create notification"
      app :layout_constraintBottom_toBottomOf= "parent"
      app :layout_constraintEnd_toEndOf= "parent"
      app :layout_constraintStart_toStartOf= "parent"
      app :layout_constraintTop_toTopOf= "parent" />

Step 3 − Add the following code to src/

import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import java.util.Objects;
public class MainActivity extends AppCompatActivity {
   private final static String default_notification_channel_id = "default";
   protected void onCreate (Bundle savedInstanceState) {
      super .onCreate(savedInstanceState);
      setContentView(R.layout. activity_main );
      Button btnCreateNotification = findViewById( btnCreateNotification );
      btnCreateNotification.setOnClickListener( new View.OnClickListener() {
         public void onClick (View v) {
            NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity. this,
               default_notification_channel_id )
               .setSmallIcon(R.drawable. ic_launcher_foreground )
               .setContentTitle( "Test" )
               .setContentText( "Hello! This is my first push notification" ) ;
            NotificationManager mNotificationManager = (NotificationManager)
               getSystemService(Context. NOTIFICATION_SERVICE ) ;
            mNotificationManager.notify( 1 , ;

Step 4 − Add the following code to androidManifest.xml

<? xml version= "1.0" encoding= "utf-8" ?>
<manifest xmlns: android = ""
   package= "" >
      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" >
            <action android :name= "android.intent.action.MAIN" />
            <category android :name= "android.intent.category.LAUNCHER" />

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 Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –