How to add Firebase Push Notifications in Android

Now google has shifted its Google Cloud Messaging to Firebase. So I am making this article on how to add Firebase Push Notifications in Android Application. Adding Firebase Push Notifications to android is very easy task Just add two class files and few permissions in AndroidManifest.xml and few line in Gradle files.
That’s it your Firebase Push Notifications in Android is set to go

Adding Firebase Push Notifications to Android involves two parts.

1.  Setting up Firebase project in your Firebase Console (Watch Video above to know how to do it)
2. Setting up your Android Studio Project (Follow to next step after doing the first step).

• You can continue this procedure to your existing Android Studio project.
• Copy google-services.json to your App folder in your project. (watch Video above to know how to get this file).
• Next, add below line to Project Gradle file

 classpath 'com.google.gms:google-services:3.0.0'

after adding above line code should like in below Image

• Now add below dependencies in app Gradle file

 compile 'com.google.firebase:firebase-messaging:9.4.0'
 compile 'com.google.firebase:firebase-core:9.4.0'

• And also add below line at the end of Gradle file.

     apply plugin: 'com.google.gms.google-services'

• After adding above line code should look below Image

 

• Android Studio will prompt you with Sync Now sync the project.
• Next, add Internet Permission to your AndroidManifest.xml file.

  <uses-permission android:name="android.permission.INTERNET" />

• Now add below services to your Manifest file in between application tags.

 <!--fcm-->

<service android:name="com.androidmkab.firebase.app.MyFirebaseMessagingService">
    <intent-filter>
        <action android:name="com.google.firebase.MESSAGING_EVENT" />
    </intent-filter>
</service>

<service android:name="com.androidmkab.firebase.app.MyFirebaseInstanceIdService">
    <intent-filter>
        <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
    </intent-filter>
</service>

In above code change com.androidmkab.firebase.app to your package name. After adding above codes your Android Manifest file should look like below Image.

Now create a new class file with Name MyFirebaseInstanceIdService and add below code to it by replacing everything except the first line which will show your package name.

import android.util.Log;

import com.google.firebase.iid.FirebaseInstanceId;

public class MyFirebaseInstanceIdService extends com.google.firebase.iid.FirebaseInstanceIdService {

    private static final String TAG = "MyFirebaseIIDService";

    @Override
    public void onTokenRefresh() {

        //Getting registration token
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();

        //Displaying token in logcat
        Log.e(TAG, "Refreshed token: " + refreshedToken);

    }

    private void sendRegistrationToServer(String token) {
        //You can implement this method to store the token on your server
        //Not required for current project
    }
}

• Now create another class file with name MyFirebaseMessagingService and below code to it same as above.

import android.app.NotificationManager;

import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.media.RingtoneManager;
import android.net.Uri;
import android.support.v4.app.NotificationCompat;
import android.util.Log;

import com.google.firebase.messaging.RemoteMessage;

public class MyFirebaseMessagingService extends com.google.firebase.messaging.FirebaseMessagingService {

    private static final String TAG = "Android News App";

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {

        //It is optional
        Log.e(TAG, "From: " + remoteMessage.getFrom());
        Log.e(TAG, "Notification Message Body: " + remoteMessage.getNotification().getBody());

        //Calling method to generate notification
        sendNotification(remoteMessage.getNotification().getTitle(), remoteMessage.getNotification().getBody());
    }

    //This method is only generating push notification
    private void sendNotification(String title, String messageBody) {
        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);

        Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle(title)
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);

        NotificationManager notificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        notificationManager.notify(0, notificationBuilder.build());
    }
}

Now run app,

If you get any error about unresolved mimmap, simple create a folder with the name "mipmap" in the layout folder where images folder are in your source code and put the ic_launcher image file in it.

Now run the code in your Android Device or Emulator (Make sure Google Play Services are supported if you are using the emulator)  after the app is launched on your device or emulator, go to Firebase Console and send notifications Lala.. you successfully sent and received Firebase Push Notifications.