[question]: NotificationServiceExtension: How to notify Ionic application when recieve background/data/silent notification?

[anatoly-spb]

How can we help?

I want to receive background/data/silent notification in my Ionic Application based on onesignal-cordova-plugin@5.1.4 and Capacitor:

import { Component } from '@angular/core';
import { IonApp, IonRouterOutlet } from '@ionic/angular/standalone';
import OneSignal from 'onesignal-cordova-plugin';

@Component({
  selector: 'app-root',
  templateUrl: 'app.component.html',
  standalone: true,
  imports: [IonApp, IonRouterOutlet],
})
export class AppComponent {
  constructor() {
    OneSignal.Debug.setLogLevel(6)
    OneSignal.initialize("xxxx")
    OneSignal.Notifications.addEventListener('click', async (e) => {
      let clickData = await e.notification;
      console.log("Notification Clicked : "  + JSON.stringify(clickData));
    })
    OneSignal.Notifications.addEventListener('foregroundWillDisplay', async (e) => {
      let notification = await e.getNotification();
      console.log("Notification Foreground Will Displayed : "  + JSON.stringify(notification));
    })
    OneSignal.Notifications.addEventListener('permissionChange', async (e) => {
      let success = await e;
      console.log("Notification Permission Changed : "  + success);
    })
    OneSignal.Notifications.requestPermission(true).then((success: Boolean) => {
      console.log("Notification permission granted " + success);
    })
    OneSignal.User.pushSubscription.getIdAsync().then(id=>{
      console.log("Notification Subscription ID: " + id);
    })
    // XXXXXXXXXX
  }
}

. According to documentation https://documentation.onesignal.com/docs/data-notifications I have implemented NotificationServiceExtension for Android:

import androidx.annotation.Keep;
import androidx.annotation.NonNull;

import com.onesignal.debug.internal.logging.Logging;
import com.onesignal.notifications.IDisplayableMutableNotification;
import com.onesignal.notifications.INotificationReceivedEvent;
import com.onesignal.notifications.INotificationServiceExtension;
@Keep
public class NotificationServiceExtension implements INotificationServiceExtension {
  @Override
  public void onNotificationReceived(@NonNull INotificationReceivedEvent event) {
    IDisplayableMutableNotification notification = event.getNotification();

    Logging.info(String.format("NotificationServiceExtension::onNotificationReceived: notificationId=%s, rawPayload=%s", notification.getNotificationId(), notification.getRawPayload()), null);
    // YYYYYYYYYYY
  }
}

But what should I call inside onNotificationReceived instead of YYYYYYYYYYY to pass this notification to Ionic Application based on Capacitor and what should I write instead of XXXXXXXXXX to subscribe on background/data/silent notification?

Thanks in advance,
Anatoly Shirokov

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[jkasten2]

@anatoly-spb

Keep in mind that background/silent are not always the best fit, so it is recommend you provide more details on your goal to see if there are better options.

We don't have a specific guide on doing bridging like this but you could use some like Ionic App Events if you need get some information from Java / Kotlin native to JavaScript.
https://capacitorjs.com/docs/v2/plugins/android#app-events