Firebase Cloud Messaging (FCM)

John Doe | Sunday, November 20, 2016

Google has an alternative which is easier than gcm. So today in this Firebase Cloud Messaging Tutorial I will teach you how to send push notification to single android devices using Firebase Cloud Messaging.

Points to integrate fcm in your project.

Crate a project in android studio.

Open build.gradle(project) and add a class path to it(

classpath 'com.google.gms:google-services:3.0.0'). After adding the class path it will be look like this-

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.0'

        //________class path for google service
        classpath 'com.google.gms:google-services:3.0.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Open build.gradle(app).
Add a dependancy (<project>/<app-module>/build.gradle)-

compile 'com.google.firebase:firebase-messaging:9.0.0'

Add a plugin in the bottom of build.gradle(<project>/<app-module>/build.gradle)-

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

After adding dependency and plugin your app level build.gradle will be look like this-

apply plugin: 'com.android.application'
android {

    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.firebasedemoproject"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:23.2.1'
    testCompile 'junit:junit:4.12'

/*______________________messaging______________________*/
    compile 'com.google.firebase:firebase-messaging:9.0.0'
  
}

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

Open manifest.xml and update it--

Add INTERNET permission
Add service to receive notification.
Add service to receive firebase instance ID(Device Token).

Now your updated manifest.xml will be look like this-

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.firebasedemoproject">
 
 <!--add permission-->
<uses-permission android:name="android.permission.INTERNET" />
   
 <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <!--activities-->
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <!--service-->

   <!--service to recive notifications-->
        <service android:name=".fcm_service.MyFirebaseMessagingService">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>

     <!--service to create firebase instance ID(Device Token)-->
        <service android:name=".fcm_service.MyFirebaseInstanceIDService">
            <intent-filter>
                <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
            </intent-filter>
        </service>
    </application>
</manifest>

Now go to the Firebase developer console and create a new project
Enter your application name and select your country. then click on create project
Now you will see a screen like this
then click on "add Firebase to your Android app".
Now put

Package name
App nickname (optional)
Debug signing certificate SHA-1 (optional)

Copy and paste the google-services.json file into the application root directory.

Now create a class named MyFirebaseInstanceIDService.java and write the following code.

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

/**
 * Created by android_studio on 17/11/16.
 */

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {

    private static final String TAG = "MyFirebaseIIDService";

    @Override
    public void onTokenRefresh() {
        //Getting registration token
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();
        //Displaying token on 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 MyFirebaseMessagingService.java and write the following code.

package com.firebasedemoproject.fcm_service;
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.firebasedemoproject.MainActivity;
import com.firebasedemoproject.R;
import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;

/**
 * Created by android_studio on 17/11/16.
 */

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    private static final String TAG = "MyFirebaseMsgService";

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {

        //Displaying data in log
        Log.d(TAG, "From: " + remoteMessage.getFrom());
        Log.d(TAG, "Notification Message Body: " + remoteMessage.getNotification().getBody());

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

    //This method is only for generating local notification with push notification data(titlenmessage)
    private void sendNotification(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("Firebase Push Notification")
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(0, notificationBuilder.build());
    }
}

All the setup has completed and now run the application.
Now see the logcat, You will see a token copy this.
Go to the firebase console, You will see the window like this-
Select Notification, You will see the window like this-
Click on "Send your first message".
Fill all the entire detail like -Message text, Target, FCM registration token
Click on "send message".
This is the notification which is sent from firebase.
You can also check on fire base-
Good bye, Thanks to read this blog.