Working with Google Firebase Part-3 Push Notification

Hello friends,

In the first part of this series we learn how to register our application on Firebase Console. In second part we learn about firebase authentication. In this part we will learn how to send push notification to our android application using Firebase.

As we know we can send push notifications using Google Cloud Messing(GCM) too. But configuring our application for GCM to receive push notifications is complex. In compare to GCM configuring push notification in our application is very easy. You have to just register you application on firebase console and create you application structure successfully. If you don't go through that how to register our application to Firebase Console, please go through this link, which is the first part of this series describe how to register our application to Firebase Console.

If you have done with application configuration, then you 80% done. Now you have to just create two service classes, one extending FirebaseMessagingService and second extending FirebaseInstanceIdService. Now register your created service classes to you manifest.xml. You are done all with configuration for firebase push notification.

NOTE: I will not explain how to implement it on server side. I will so example to sending notification using Firebase Console.

Ok, Now add this gradle line to your build.gradle file:

              compile 'com.google.firebase:firebase-messaging:9.2.0'

Create two service classes One for getting notification token id, which is used for server side notification implementation and Second for receive notifications.

MyFirebaseInstanceIDService.java

import android.util.Log;
import com.google.firebase.iid.FirebaseInstanceId;
import com.google.firebase.iid.FirebaseInstanceIdService;

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {
    public MyFirebaseInstanceIDService() {
    }
    @Override
    public void onTokenRefresh() {
     // Get updated InstanceID token.
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();
        Log.d("firebase", "Refreshed token: " + refreshedToken);
       //This token is used by server side so use below method to send token to server
     // sendRegistrationToServer(refreshedToken);
    }
}

MyFirebaseMessagingService.java

import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.support.v7.app.NotificationCompat;
import android.util.Log;
import com.doird.amar.myfirebaseimpl.R;
import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;

public class MyFirebaseMessagingService extends FirebaseMessagingService {
    public MyFirebaseMessagingService() {
    }

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);
        Log.d("firebase", "Notification Message: " +
                remoteMessage.getNotification().getBody());
        showNotification(remoteMessage.getNotification().getBody());
    }

    private void showNotification(String msg) {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
        builder.setSmallIcon(R.mipmap.ic_launcher);
        Intent intent = new Intent();
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
        builder.setContentIntent(pendingIntent);
        builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher));
        builder.setContentTitle("Firebase Push Notification");
        builder.setContentText(msg);
        NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        notificationManager.notify(1, builder.build());
    }
}

And now add these two classes to your manifest.xml file like this:-

<service
    android:name=".services.MyFirebaseMessagingService"
    android:enabled="true"
    android:exported="true">
    <intent-filter>
        <action android:name="com.google.firebase.MESSAGING_EVENT" />
    </intent-filter>
</service>


<service android:name=".services.MyFirebaseInstanceIDService">
    <intent-filter>
        <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
    </intent-filter>
</service>

You are done with firebase notification work. Now go to  Firebase Console and select your registered application. Look for a Notification option in left panel and click.

Compose your notification message and send. Look this link for more clearance. Best of Luck :)