This tutorial is about How Creating Notification in android studio using onesignal for notification and firebase for api server
place this script to your app build
manifestPlaceholders = [onesignal_app_id: "5598bb26-2fe9-4539-a4d2-5f8172c2817d",
// Project number pulled from dashboard, local value is ignored.
onesignal_google_project_number: "REMOTE"]
compile 'com.onesignal:OneSignal:3.5.3'
and script to your application
import com.onesignal.OneSignal;
OneSignal.startInit(this).init();
easy tutorial right?