How to display count of notifications in toolbar icon in Android?

This example demonstrate about How to display count of notifications in toolbar icon in Android.
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" >
   <Toolbar
      android :layout_width = "match_parent"
      android :layout_height = "?actionBarSize"
      android :background = "@color/colorPrimary" >
      <RelativeLayout
         android :layout_width = "match_parent"
         android :layout_height = "match_parent"
         android :layout_marginEnd = "16dp" >
         <TextView
            android :layout_width = "wrap_content"
            android :layout_height = "wrap_content"
            android :layout_centerVertical = "true"
            android :text = "Notify Me"
            android :textAppearance = "@style/Base.TextAppearance.AppCompat.Medium"
            android :textColor = "#FFF"
            android :textStyle = "bold" />
         <RelativeLayout
            android :id = "@+id/notificationBadge"
            android :layout_width = "wrap_content"
            android :layout_height = "wrap_content"
            android :layout_alignParentEnd = "true"
            android :layout_centerVertical = "true" >
            <RelativeLayout
               android :id= "@+id/badgeLayout"
               android :layout_width = "wrap_content"
               android :layout_height = "wrap_content"
               android :paddingTop = "8dp" >
               <Button
                  android :layout_width = "36dp"
                  android :layout_height = "36dp"
                  android :background = "@drawable/action_notification" />
            </RelativeLayout>
            <TextView
               android :id = "@+id/tvBadgeNumber"
               android :layout_width = "wrap_content"
               android :layout_height = "wrap_content"
               android :layout_alignTop = "@+id/badgeLayout"
               android :layout_alignEnd = "@id/badgeLayout"
               android :background = "@drawable/item_count"
               android :text = "0"
               android :textColor = "#FFF"
               android :textSize = "16sp"
               android :textStyle = "bold" />
         </RelativeLayout>
      </RelativeLayout>
   </Toolbar>
   <Button
      android :layout_width = "match_parent"
      android :layout_height = "wrap_content"
      android :layout_centerInParent = "true"
      android :layout_margin = "16dp"
      android :onClick = "createNotification"
      android :text = "create notification" />
</RelativeLayout>
Step 3 − Add the following code to src/MainActivity.
package app.tutorialspoint.com.notifyme ;
import android.app.NotificationChannel ;
import android.app.NotificationManager ;
import android.app.PendingIntent ;
import android.content.Intent ;
import android.os.Bundle ;
import android.support.v4.app.NotificationCompat ;
import android.support.v7.app.AppCompatActivity ;
import android.view.View ;
import android.widget.TextView ;
public class MainActivity extends AppCompatActivity {
   public static final String NOTIFICATION_CHANNEL_ID = "10001" ;
   private final static String default_notification_channel_id = "default" ;
   static int notificationCount = 0 ;
   TextView tvBadgeNumber ;
   @Override
   protected void onCreate (Bundle savedInstanceState) {
      super .onCreate(savedInstanceState) ;
      setContentView(R.layout. activity_main ) ;
      tvBadgeNumber = findViewById(R.id. tvBadgeNumber ) ;
   }
   public void createNotification (View view) {
      Intent notificationIntent = new Intent(getApplicationContext() , MainActivity. class ) ;
      notificationIntent.putExtra( "fromNotification" , true ) ;
      notificationIntent.setFlags(Intent. FLAG_ACTIVITY_CLEAR_TOP | Intent. FLAG_ACTIVITY_SINGLE_TOP ) ;
      PendingIntent pendingIntent = PendingIntent. getActivity ( this, 0 , notificationIntent , 0 ) ;
      NotificationManager mNotificationManager = (NotificationManager) getSystemService( NOTIFICATION_SERVICE ) ;
      NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity. this, default_notification_channel_id ) ;
      mBuilder.setContentTitle( "My Notification" ) ;
      mBuilder.setContentIntent(pendingIntent) ;
      mBuilder.setContentText( "Notification Listener Service Example" ) ;
      mBuilder.setTicker( "Notification Listener Service Example" ) ;
      mBuilder.setSmallIcon(R.drawable. ic_launcher_foreground ) ;
      mBuilder.setAutoCancel( true ) ;
      if (android.os.Build.VERSION. SDK_INT >= android.os.Build.VERSION_CODES. O ) {
         int importance = NotificationManager. IMPORTANCE_HIGH ;
         NotificationChannel notificationChannel = new NotificationChannel( NOTIFICATION_CHANNEL_ID , "NOTIFICATION_CHANNEL_NAME" , importance) ;
         mBuilder.setChannelId( NOTIFICATION_CHANNEL_ID ) ;
         assert mNotificationManager != null;
         mNotificationManager.createNotificationChannel(notificationChannel) ;
      }
      assert mNotificationManager != null;
      mNotificationManager.notify(( int ) System. currentTimeMillis () , mBuilder.build()) ;
      notificationCount ++ ;
      tvBadgeNumber .setText(String. valueOf ( notificationCount )) ;
   }
}
Step 4 − Add the following code to res/drawable/item_count.xml
<? xml version = "1.0" encoding = "utf-8" ?>
<shape xmlns: android = "http://schemas.android.com/apk/res/android"
   android :shape = "rectangle" >
   <corners android :radius = "8dp" />
   <solid android :color = "#2196F3" />
   <stroke
      android :width = "1dip"
      android :color = "#FFF" />
      <padding
         android :bottom = "2dp"
         android :left = "2dp"
         android :right = "2dp"
         android :top = "2dp" />
      </shape>
Step 5 − 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= "app.tutorialspoint.com.notifyme" >
   <uses-permission android :name= "android.permission.VIBRATE" />
   <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 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