OreoAndAboveNotification.java

package com.codewithharry.firebase.notifications;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.ContextWrapper;
import android.net.Uri;
import android.os.Build;

import androidx.annotation.RequiresApi;

public class OreoAndAboveNotification extends ContextWrapper {

    private static final String ID = "some_id";
    private static final String NAME = "FirebaseAPP";

            private NotificationManager notificationManager;

    public OreoAndAboveNotification(Context base) {
        super(base);
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.O) {
            createChannel();
        }
    }

    @RequiresApi(api = Build.VERSION_CODES.O)
    private void createChannel() {
        NotificationChannel notificationChannel = new NotificationChannel(ID, NAME, NotificationManager.IMPORTANCE_DEFAULT);
        notificationChannel.enableLights(true);
        notificationChannel.enableVibration(true);
        notificationChannel.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
        getManager().createNotificationChannel(notificationChannel);
    }

    public  NotificationManager getManager() {
        if (notificationManager == null) {
            notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        }
        return notificationManager;
    }

    @RequiresApi(api = Build.VERSION_CODES.O)
    public  Notification.Builder getONotification(String title,
                                                  String body,
                                                  PendingIntent pIntent,
                                                  Uri soundUri,
                                                  String icon) {

        return new Notification.Builder(getApplicationContext(), ID)
                .setContentIntent(pIntent)
                .setContentTitle(title)
                .setContentText(body)
                .setSound(soundUri)
                .setAutoCancel(true)
                .setSmallIcon(Integer.parseInt(icon));
    }

}