PushNotificationService.java

package com.fastaccess.provider.fcm;

import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.NotificationCompat;

import com.fastaccess.R;
import com.fastaccess.ui.modules.main.MainActivity;
import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;

/**
 * Created by Kosh on 16 Apr 2017, 1:17 PM
 */

public class PushNotificationService extends FirebaseMessagingService {

    @Override public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);
        String title = remoteMessage.getNotification().getTitle();
        String body = remoteMessage.getNotification().getBody();
        if (remoteMessage.getData() != null && !remoteMessage.getData().isEmpty()) {
            title = title == null ? remoteMessage.getData().get("title") : title;
            body = body == null ? remoteMessage.getData().get("message") : body;
        }
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.drawable.ic_notification)
                .setContentTitle(title)
                .setContentText(body)
                .setAutoCancel(true)
                .setContentIntent(pendingIntent);
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(1, notificationBuilder.build());
    }
}